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Daniels VT-3/140-SWA2 Instruction Manual

Vhf transmitter, mt3 radio systems, 132 - 174 mhz
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MT-3 RADIO SYSTEMS
Covers model:
Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels
Electronics Ltd.
DE™ is a registered trademark of Daniels Electronics Ltd. registered in the United States Patent
and Trademark Office.
Issue:
3
Issue Date:
May 1998
Printing Date:
January 2001
Part No.:
IM21-VT3150
VHF TRANSMITTER
INSTRUCTION MANUAL
VT-3
132 - 174 MHz
VT-3/140-SWA2, VT-3/160-SWA2
VT-3/140-SWA8, VT-3/160-SWA8
VT-3/140-SNA2, VT-3/160-SNA2
VT-3/140-SNA8, VT-3/160-SNA8
Previous Issue:
Previous Issue Date: April 1997
2
Daniels Electronics Ltd.
Victoria, B.C.
PRINTED IN CANADA

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  • Page 1 VT-3/140-SNA2, VT-3/160-SNA2 VT-3/140-SNA8, VT-3/160-SNA8 Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels Electronics Ltd.
  • Page 2 NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
  • Page 3 TABLE OF CONTENTS Page GENERAL......................... 1-1 Introduction ....................1-1 Manual Organization ..................1-1 VT-3 132 - 174 MHz Transmitter Family Models.......... 1-2 Performance Specifications................1-3 1.4.1 General....................1-3 1.4.2 Audio Specifications................1-4 1.4.3 Physical Specifications ............... 1-5 SYSTEM OVERVIEW ....................2-1 Transmitter Operation..................
  • Page 4 RF Exposure Warning This transmitting equipment conforms to SAR (Specific Absorption Rate) limits regarding exposure of human beings to radio frequency electromagnetic energy, as defined in the following national and international standards and guidelines: Industry Canada Radio Standards Specification 102 (RSS-102), Evaluation Procedure for Mobile and Portable Radio Transmitters with respect to Health Canada’s Safety Code 6 for Exposure of Humans to Radio Frequency Fields;...

  • Page 5: General

    The synthesizer module can be programmed to have up to 16 channels exclusive to one frequency band. The VT-3 132 - 174 MHz Transmitter is designed to interface with Daniels Electronics' MT-3 Repeater System while maintaining MT-2 System compatibility.

  • Page 6: Vt-3 132 - 174 Mhz Transmitter Family Models

    The 8 models are as follows: • VT-3/140-SNA2 - synthesized, 132-150 MHz band, 5.0/6.25 kHz channels, 0.5-2.0 W • VT-3/140-SWA2 - synthesized, 132-150 MHz band, 5.0/6.25 kHz channels, 0.5-2.0 W • VT-3/140-SNA8 - synthesized, 132-150 MHz band, 5.0/6.25 kHz channels, 2.0-8.0 W •...

  • Page 7: Performance Specifications

    Performance Specifications invisible text 1.4.1 General The following is a general set of specifications for the generic VT-3/150 transmitter. Additional specifications, specific to individual modules may be found in their respective submanuals. Type: MT-3 Series Transmitter. Family: VT-3/150. Compatibility: MT-2 Series and MT-3 Series Radio Systems. Frequency Range: 132 to 174 MHz.

  • Page 8: Audio Specifications

    PTT Activation: • Active to ground with or without time-out-timer; • Microphone activated with or without time-out- timer; • Front Panel switch: KEY TX - without time-out- timer; • NORM - with or without time-out-timer. • Isolated (optional relay) with or without time-out- timer.

  • Page 9: Physical Specifications

    4 layer printed circuitboards. Gold plated module connectors. Module Design: Compact Eurostandard modular design. Plug-in modules mate with Daniels standard M3 repeater subrack. Subracks / modules comply with IEEE 1101, DIN 41494 and IEC 297-3 (mechanical size / modular arrangement).

  • Page 10: System Overview

    SYSTEM OVERVIEW Transmitter Operation Several modules are integrated by the VT-3 Transmitter Main board to provide the complete transmitter. The Transmitter Main Board, Front Panel Board and Audio Processor are generic in that they apply to all transmitter models. The Front Panel Board and Audio Processor are soldered directly to the Transmitter Main Board and are treated collectively in the Transmitter Main Board Manual.
  • Page 11 • MODE 2: Jumper J6 in, jumper J7 in the 'y' position, jumper J18 in the 'x' position - the audio processor is switched by a PTT signal - the synthesizer module is enabled all of the time - standby current: Typically 65 mA - start-up time: Typically 25 ms •...

  • Page 12: Frequency Selection

    Frequency Selection invisible text 2.2.1 Synthesizer Transmitter Eight backplane connections are used to communicate with the synthesizer unit. Pins D28, D30, and D32 are used (in house) to program the synthesizer. Channel select lines (pins D20, D22, D24, and D26) are used once the synthesizer is programmed to select one of 16 channels. If the channel select lines are all low (channel 0) the frequency for the synthesizer is read from switches FSW1 (most significant), FSW2, FSW3, and FSW4 (least significant).

  • Page 13: Transmitter Assembly And Adjustment

    A channel can be selected from a set of 15 (maximum possible) factory programmed channels by the four channel select lines available at the rear 'F' connector on the Transmitter Main Board. A single user selectable channel is set by switches located on the Transmitter Main Board. See the Transmitter Main Board Manual for details.

  • Page 14: Frequency Change

    2.3.2 Frequency Change The transmitter is initially aligned at the factory for the frequency stamped on the 'Factory Set Operating Frequency' label (see section 3.1). This label should list the frequency at which the last complete transmitter alignment was performed. For a small frequency change, a simple channel change (see section 2.2) may be all that is required.

  • Page 15: Deviation Setting

    2.3.4 Deviation Setting The transmitter maximum deviation range is set by jumpers at the factory to ± 5.0 kHz for the VT-3 132 - 174 MHz transmitter. However, under some conditions such as a large change in transmitter operating frequency, the deviation control may need adjustment. The transmitter deviation is dependent on the operating frequency and this dependency is likely to be more severe at the band edges.

  • Page 16: Repair Note

    • PCB number 43-912010 indicates circuitboard version 1.0; • PCB number 50002-02 indicates circuitboard version 2.0. All PCB's manufactured by Daniels Electronics are identified by one of the above conventions. VHF Enhanced Transmitter Instruction Manual VT-3 132 - 174 MHz...

  • Page 17: Illustrations

    KEY TX MICROPHONE CONNECTOR RF OUT REFERENCE TYPE N RF SMA REFERENCE OUTPUT JACK INPUT JACK INPUT RED TEXT MADE IN CANADA MADE IN CANADA MADE IN CANADA VT-3/160-SWA8 TRANSMITTER VT3150M1 MODEL IDENTIFIER DANIELS ELECTRONICS LTD. VHF Transmitter Instruction Manual...

  • Page 18: Mt-3 Transmitter Case - Exploded View

    MT-3 Transmitter Case - Exploded View 3 FINGER GASKET (2) MT3TXM2B Instructions 1. Remove the four screws (A) in the Front panel. 2. Remove the four screws (B) on the side of the Transmitter Case. DANIELS ELECTRONICS VHF Transmitter Instruction Manual...

  • Page 19: Parts List

    PARTS LIST Description Part No. Qty. LABEL/LEXAN, 14HP, VHF: RED 3536-10111405 VHF Enhanced Transmitter Instruction Manual VT-3 132 - 174 MHz...
  • Page 20 This Page Intentionally Left Blank VHF Enhanced Transmitter Instruction Manual VT-3 132 - 174 MHz...

  • Page 21: Revision History

    REVISION HISTORY ISSUE DATE DESCRIPTION AND (REASON) May 98 • Manual formatted to modular style. All previous revision history in issue 2. VHF Enhanced Transmitter Instruction Manual VT-3 132 - 174 MHz...
  • Page 22 This Page Intentionally Left Blank VHF Enhanced Transmitter Instruction Manual VT-3 132 - 174 MHz...
  • Page 23 Version 1.6 & 1.8 of the FM Audio Processor Board Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels Electronics Ltd.
  • Page 24 NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
  • Page 25 TABLE OF CONTENTS Page GENERAL........................1-1 Introduction ....................1-1 Performance Specifications................1-1 1.2.1 General....................1-1 1.2.2 Audio Specifications................1-2 THEORY OF OPERATION..................2-1 Transmitter Main Board..................2-1 2.1.1 General....................2-1 2.1.2 Transmitter Push-To-Talk..............2-1 2.1.2.1 Microphone PTT ..............2-1 2.1.2.2 PTT With Time-Out-Timer.............2-2 2.1.2.3 PTT No Time-Out-Timer............2-2 2.1.2.4 Optional Relay................2-2 2.1.2.5 PTT Output................2-3 2.1.2.6...
  • Page 26 2.4.1 General....................2-12 2.4.2 Power Requirements................2-12 2.4.3 Audio Processor Turn-on Time ............2-13 2.4.4 Audio Processor Signals..............2-13 2.4.4.1 Audio Processor Outputs............2-13 2.4.4.2 Audio Processor Modulation Output........2-14 2.4.4.3 Audio Processor Low Frequency / Direct Mod. Output ..2-14 2.4.4.4 Audio Processor Inputs ............2-14 2.4.4.5 Audio Processor Microphone Input........2-15 2.4.4.6 Audio Processor Balanced Input..........2-15...
  • Page 27 5.2.1 Transmitter Main Board Top Side Component Layout.......5-3 5.2.2 Transmitter Main Board Bottom Side Component Layout....5-4 5.2.3 Transmitter Main Board Schematic Diagram........5-5 Front Panel Board...................5-6 5.3.1 Front Panel Board Component Layout..........5-6 5.3.2 Front Panel Board Schematic..............5-7 Audio Processor Electrical Assembly (Version 1.6) ........5-8 5.4.1 Audio Processor Component Layout..........5-8 5.4.2...
  • Page 28 This Page Intentionally Left Blank. Transmitter Main Board Instruction Manual...
  • Page 29 GENERAL invisible text Introduction The MT-3 Transmitter Main Board integrates the MT-3 Front Panel Board, MT-3 Audio Processor, Synthesizer or Crystal Controlled Oscillator module, and Amplifier module together to comprise a MT-3 series transmitter (see section 5.1: MT-3 Transmitter Block Diagram). The Front Panel Board and the Audio Processor are soldered directly to the Transmitter Main Board while the Amplifier and the Synthesizer or Crystal Controlled Oscillator module are frequency band sensitive, plug-in modules.
  • Page 30 1.2.2 Audio Specifications Audio Input: Balanced 600 ohm or unbalanced (optional). Input level sensitivity, -25 dBm to 0 dBm. Audio Response: Pre-emphasis (6 dB per octave); +0.5 to -2.0 dB from 300 Hz to 3 kHz; Flat Audio Response: +1 to -1 dB from 100 Hz to 3 kHz. Audio Deviation: Preset to ±1.5 kHz (Narrow Band) or ±3.0 kHz (Wide Band) with a 1 kHz tone (capable ±2.5 kHz or ±5.0 kHz).
  • Page 31 THEORY OF OPERATION invisible text Transmitter Main Board invisible text 2.1.1 General Switch SW1 on the Front Panel Board is a DPDT switch which controls the operation of the transmitter (refer to the operations section of the Transmitter Manual). When SW1 is in the 'OFF' position the transmitter is turned off;...
  • Page 32 2.1.2.2 PTT With Time-Out-Timer Pins B10 and Z10 of the backplane connector are the PTT WTO input. When the PTT WTO signal, which is normally high, falls below +2.0 Vdc, the transmitter is keyed. The transmitter is disabled when the PTT WTO input rises above +2.3 Vdc or if the TOT's time-out period is exceeded.
  • Page 33 To configure the isolated input for PTT NTO operation jumpers J2, J3, and J4, must be in the 'x' position. In this mode, pins B14 and Z14 no longer function as the PTT NTO input; however, pins B10 and Z10 continue to function as the normal PTT WTO input. 2.1.2.5 PTT Output Pin B24 on the backplane connector is an open drain output (Q9) which is pulled low anytime the...
  • Page 34 intended only as a guideline. Refer to the instruction manual for the transmitter that came with your system for specifications. • MODE 1: Jumper J6 out - the audio processor is switched by a PTT signal - the synthesizer or crystal controlled oscillator is switched by a PTT signal - standby current: Synthesized - typically 7 mA Crystal Controlled - typically 6 mA...
  • Page 35 Z18 by a transformer (T1). Two audio outputs from the MT-3 Audio Processor are routed to the synthesizer or crystal control oscillator modules. 2.1.3.1 Microphone Audio Normally the audio from a transmitter's microphone is transmitted by that transmitter; however, the Transmitter Main Board can be configured by the MIC IN and MIC OUT lines so that the audio from an external microphone modulates transmitter.
  • Page 36 2.1.4.2 Crystal Controlled Transmitter The OC-3 Crystal Control Oscillator module is a direct replacement for the synthesizer module and therefore uses the same connections as the synthesizer to connects to the MT-3 Transmitter Main Board. The channel select lines and switches FSW1 to FSW4 are not used by the crystal control module as the transmitter's operating frequency is determined by the Crystal Control Oscillator module's crystal frequency.
  • Page 37 The time-out duration is jumper selectable from 1 second to 8 hours. The positions of the jumpers on the top (Through hole component) side of the Transmitter Main Board. Table 2-1 shows the time-out duration in minutes for the various jumper settings which are listed as enabled (E: jumper shorted - in) or disabled (D: jumper left open - out).
  • Page 38 +8.0 Vdc supply are required to power the module. The MT-3 Audio Processor is backwards compatible to Daniels Electronics MT-2 series transmitters. Refer to section 5.4.1 "MT-3 Audio Processor Component Layout" and to section 5.4.2 "MT-3 Audio Processor Schematic Diagram"...
  • Page 39 Table 2-1 MT-3 Audio Processor Current Consumption. Function Current Draw keyed / unkeyed Switched Audio Standby Both Microphone and Balanced Input enabled 29.0 / 0.5 mA Only Microphone or Balanced Input enabled 17.5 / 0.5 mA Only Auxiliary Input enabled 6.0 / 0.5 mA Continuous Audio Standby Both Microphone and Balanced Input enabled 29.0 / 25.5 mA...
  • Page 40 2.3.4.2 Audio Processor Modulation Output The Modulation Output port is the output port used by all voice input signals. The voice inputs are combined by summing amplifier U4a which has an associated symmetry control (R14). Op-amp U4a together with U5a provide the limiting action for the audio processor. After the audio signals have been combined and limited, they are filtered by a 6 pole lowpass Butterworth filter (U5b, U5c, and U5d).
  • Page 41 2.3.4.5 Audio Processor Microphone Input The microphone input has an automatically gain controlled (AGC) preamplifier whose input level is controlled by R2. The microphone input level control (R2) can accommodate a -25 dBm to 0 dBm input signal. The compression level for the microphone input is adjusted by R8. The microphone input is limited and filtered and is output at the standard modulation output port.
  • Page 42 +8.0 Vdc supply are required to power the module. The MT-3 Audio Processor is backwards compatible to Daniels Electronics MT-2 series transmitters. Refer to section 5.5.1 "MT-3 Audio Processor Component Layout" and to section 5.5.2 "MT-3 Audio Processor Schematic Diagram"...
  • Page 43 Table 3-1 MT-3 Audio Processor Current Consumption. Function Current Draw keyed / unkeyed Switched Audio Standby Both Microphone and Balanced Input enabled 6.0 / 0.3 mA Only Microphone or Balanced Input enabled 4.5 / 0.3 mA Only Auxiliary Input enabled 3.0 / 0.3 mA Continuous Audio Standby Both Microphone and Balanced Input enabled 6.0 / 3.5 mA...
  • Page 44 2.4.4.2 Audio Processor Modulation Output The Modulation Output port is the output port used by all voice input signals. The voice inputs are combined by U1, a gain level programmable compandor which is configured as an automatic level control amplifier. Op-amp U4a together with U5a provide the limiting action for the audio processor.
  • Page 45 2.4.4.5 Audio Processor Microphone Input The microphone input has an automatically level controlled (ALC) preamplifier U1 whose input level is controlled by R2. The microphone input level control (R2) can accommodate a -25 dBm to 0 dBm input signal. The microphone input is limited and filtered and is output at the standard modulation output port.
  • Page 46 2.4.4.9 Audio Processor Direct Modulation Input The Direct Modulation Input is an extremely versatile input. This port is designed to be used for data signals. Depending on the application, the signal can be amplified, AC or DC coupled and output to the Modulation Output or the Low Frequency / Direct Modulation Output port. Please consult the factory for specific jumper settings for your application.
  • Page 47 • PCB number 43-912010 indicates circuitboard version 1.0; • PCB number 50002-02 indicates circuitboard version 2.0. All PCB's manufactured by Daniels Electronics are identified by one of the above conventions. Recommended Test Equipment List Alignment of the complete transmitter requires the following test equipment or its equivalent. It is assumed that any adjustment of the Transmitter Main Board will also involve the other modules.
  • Page 48 Radio communications test set : Marconi Instruments 2955R VSWR 3:1 mismatch load: JFW 50T-035-3.0:1 Alignment Tool: Johanson 4192 It is recommended that the radio communications test set be frequency locked to an external reference (WWVH, GPS, Loran C) so that the high stability oscillator may be accurately set to within its ±1 ppm frequency tolerance.
  • Page 49 • Jumper J26: installed Time-Out-Timer Timing resistor select. • Jumper J27: not installed Time-Out-Timer Timing resistor select. • Jumper J28: not installed Time-Out-Timer Timing period output select. • Jumper J29: installed Time-Out-Timer Timing period output select. • Jumper J31: installed Time-Out-Timer Timing period output select.
  • Page 50 • Jumper JU11: not installed Balanced input to auxiliary audio circuit enable. • Jumper JU12: not installed Tone/Digital input to auxiliary audio circuit enable. • Jumper JU13: not installed Direct modulation input to auxiliary audio circuit enable. • Jumper JU14: not installed Auxiliary input preemphasis response enable.
  • Page 51 3.6.2 MT-3 Transmitter Board Test Points TP1: squelched, de-emphasized audio / +13.8 Vdc TP2: microphone audio TP3: microphone PTT WTO; inactive +9.5 Vdc, active 0 Vdc TP4: microphone PTT NTO; inactive +9.5 Vdc, active 0 Vdc TP5: +9.5 Vdc from backplane connector TP6: +9.5 Vdc from front panel board TP7:...
  • Page 52 To remove the Enhanced Synthesizer or Crystal Controlled Oscillator module, simply remove the center screw from the module lid and pull the module out. The module should be pulled straight out so that the four alignment pins do not bend or damage the circuitboard. The Low Power Synthesizer uses two tabs soldered to the Transmitter Main Board for mounting.
  • Page 53 Turn the transmitter on. Adjust the balance compression level (R38) for compression at ±60% maximum deviation. Set the audio frequency to 2.4 kHz, then adjust the deviation control (R29) for maximum deviation. Reset the modulating frequency to 1 kHz and re-adjust R38 for ±60% maximum deviation.
  • Page 54 Apply a 1 kHz tone at -8 dBm to the microphone audio input. Set the microphone compression control (R8) to produce ±60% maximum deviation. Reduce the signal to -10 dBm and adjust the microphone input level control (R2) for ±50% maximum deviation.
  • Page 55 • Jumper JU10: not installed Balanced input flat audio response enable. • Jumper JU11: 'y' position Balanced input to auxiliary audio circuit enable. • Jumper JU12: not installed Tone/Digital input to auxiliary audio circuit enable. • Jumper JU13: not installed Direct modulation input to auxiliary audio circuit enable.
  • Page 56 3.10 MT-3 Audio Processor Alignment (Version 1.8) invisible text 3.10.1General Verify the standard factory settings for the MT-3 Audio Processor as given in section 3.9.1 before beginning the standard deviation adjustment procedure. If the transmitter's channel frequency changes, the audio processor should be realigned to optimize the transmitter's performance. The schematic diagram for the audio processor is shown in section 5.5.2 and the component layout is shown in section 5.5.1.
  • Page 57 (R42) to produce ±500 Hz deviation. Remove the signal. 3.11 Low Frequency Modulation Configuration Note: the following information originates from Daniels Electronics document number A0361-06. 3.11.1MT-3 Transmitters For transmitters, the LTR™ or DCS signal should be applied to the DIRECT MODULATION input (pin Z28), which is also available on the M-3 and SR-3 motherboards at the control connectors J1, P1, or J7 on pins B20 (TX A DIR MOD) and A20 (TX B DIR MOD).
  • Page 58 MT-3 Transmitter (board version 43-920910 through 43-920911) • J6 installed (synthesizer always powered up by +9.5V SWITCHED line). • J7 installed in 'X' position (audio processor always powered up by +9.5VSWITCHED line). • solder a wire from JA4-2 of main board to J51-18 of synthesizer. This connects the subtone output 2 to the synthesizer's phase modulation input.
  • Page 59 input to the transmitter to be used to gain access to the SUBTONE INPUT 2 which connects to the PHASE MOD IN input of a modified synthesizer. • Make sure J13 and J16 are not installed. Figure 3-1 Transmitter Audio Processor Low Frequency Modulation. SHORT TOP TWO PINS REMOVE REPLACE WITH...
  • Page 60 3.11.4Tuning the Transmitter For all MT-3 transmitters, apply a low impedance source of 20-300 Hz to the Direct Modulation input of the transmitter (Pin Z28 of the 48 pin connector) through a 22 uF capacitor, positive terminal connected to pin Z28. A Marconi 2955 works well for this test. Adjust R44 on the audio processor to the fully clockwise position.
  • Page 61 TRANSMITTER INTERCONNECT PIN DEFINITIONS The MT-3 series Transmitter employs a 48 pin Eurostandard connector for interfacing to all transmitter power, audio, and control functions. The following are the MT-3 series Transmitter backplane connections to the M-3 Motherboard. Name Pin Name Pin Name No Connect +13.8 Vdc...
  • Page 62 This Page Intentionally Left Blank Transmitter Main Board Instruction Manual...
  • Page 63 NC 2 NC 1 PTT TRIGGER PZT2222A COMMON 1 SWITCHING +9.5VDC + 9.5 VDC PTT SWITCHED CIRCUITRY PTT NTO + 9.5 VDC SWITCHED TX STANDBY PTT OUTPUT PTT OUTPUT MT3TXMNM1D DANIELS ELECTRONICS LTD. MT-3 AM Transmitter Main Board Instruction Manual...
  • Page 64 This Page Intentionally Left Blank DANIELS ELECTRONICS Transmitter Main Board Instruction Manual...
  • Page 65 TP15 TP17 TP18 TP21 TP22 TP34 TP14 43-920917 Factory installed jumpers Factory installed jumpers DANIELS MT3TXMNM2B - Components Not Installed VICTORIA B.C . ELECTRONICS TITLE: TITLE: TITLE: MT-3 Component Side SM Layout MT-3 Transmitter Component Side SM Designations MT-3 Transmitter Component Side T/H Designations...
  • Page 66 LPF4 SCREW (2) 27k4 27k4 LPF2 LPF1 1k00 (3A FUSE OPTIONAL) 43-920917 Factory installed jumpers DANIELS Components Not Installed Components Not Installed MT3TXMNM3B VICTORIA B.C . ELECTRONICS TITLE: TITLE: TITLE: MT-3 Transmitter Solder Side SM Layout MT-3 Transmitter Solder Side SM Designations...
  • Page 67 10K0 9.5V RELAY1 BC817-25 LPF26 BC807-25 BYD17J 68K1 PTT OUTPUT LPF35 TP34 FSW4 DANIELS ELECTRONICS VICTORIA B.C. AM/FM STANDBY MODES UNUSED REFERENCE DESIGNATORS LPF15 STANDARD/LOW FREQUENCY MODULATION TITLE: MT-3 TRANSMITTER BOARD SCHEMATIC DIAGRAM TX STANDBY MODE 1 MODE 2 MODE 3...
  • Page 68 Front Panel Board 5.3.1 Front Panel Board Component Layout Factory Installed Solder Jumper. Solder Jumper On Solder Side Of PCB. 43-921212 MT3TXMNM5A DANIELS ELECTRONICS Transmitter Main Board Instruction Manual...
  • Page 69 PF1 -3 M IC-3 RX AUDIO PF1 -2 M IC-4 MIC INPUT PF1 -1 M IC-2 PF1 -4 M IC-1 DANIELS ELECTRONICS VICTORIA B.C . MT-3 FRONT PANEL BOAR D TITLE: APRVD: DATE.: DWN: M. GAUBE 07 A PRI L 1992...
  • Page 70 43-911916 Low Frequency Modulation Configuration MT3APM1A Desig Low Freq. Desig Low Freq. JU27X Not Installed Installed JU35Y DANIELS Not Installed JU27Y JU37 Not Installed VICTORIA B.C . JU31 Not Installed ELECTRONICS LTD. JU38X Not Installed NOTE: For Low Frequency Modulation...
  • Page 71 1.0uF low = data 1.0uF MC33172 LOW FREQUENCY / DIRECT JU31 MODULATION OUTPUT JU28 JU37 DANIELS ELECTRONICS VICTORIA B.C. TITLE: MT-3 TX AUDIO PROCESSOR SCHEMATIC DIAGRAM DATE: 19 SEPTEMBER 1991 DWN BY: MICHAEL GAUBE APRVD: DWG No: MT3APM2C DWG REV DATE:...
  • Page 72 1.0µF 33nF 100nF 1.0µF PCB 43-911918 MT3APM1B Component Side DANIELS VICTORIA B.C . ELECTRONICS ELECTRONICS TITLE: MT-3 Tx Audio Processor SM Layout TITLE: MT-3 Tx Audio Processor SM Designations TITLE: MT-3 Tx Audio Processor Through Hole Layout MT-3 Tx Audio Processor SM Layout / Jumpers...
  • Page 73 JU30 high = voice 4K53 low = data JU29 10K0 JU28 TCXO LEVEL ADJUST +9.5V CONTINUOUS OPTIONAL DANIELS HIGHEST REFERENCE DESIGNATORS ELECTRONICS VICTORIA B.C. JU44 TITLE: MT-3 TX AUDIO PROCESSOR SCHEMATIC DIAGRAM ----- DATE: 12 MAY 98 MT-3 TX TIME-OUT-TIMER...
  • Page 74 This Page Intentionally Left Blank DANIELS ELECTRONICS 5-12 Transmitter Main Board Instruction Manual...
  • Page 75 PARTS LISTS invisible text Transmitter Main Board Parts List invisible text 6.1.1 Transmitter Main Board Electrical Parts List Desig Description Part No. CAP., SM, 10µF TANT., 10%, 35V 1055-6D106K35 CAP., SM, 1.0µF TANT., 20%, 35V 1055-5B105M35 CAP., SM, 10µF TANT., 20%, 16V 1055-6C106M16 CAP., SM, 1.0µF TANT., 20%, 16V 1055-5A105M16...
  • Page 76 Desig Description Part No. RES., SM, 10R0 0805, 1%, 100 ppm 1150-1A10R0FP RES., SM, 27k4 0805, 1%, 100 ppm 1150-4A2742FP RES., SM, 1k00 0805, 1%, 100 ppm 1150-3A1001FP RES., SM, 27k4 0805, 1%, 100 ppm 1150-4A2742FP RES., SM, 10R0 0805, 1%, 100 ppm 1150-1A10R0FP RES., SM, 27k4 0805, 1%, 100 ppm 1150-4A2742FP...
  • Page 77 6.1.2 Transmitter Main Board Mechanical Parts List Description Part No. Qty. CABLE, SMB-SMB PLUG, RG316,12cm $7910-WP0WP012 1 (Enhanced Synth and Crystal Control) CABLE, SMA-SMB PLUG, RG316,15cm $7910-SP0WP015 1 (Low Power Synth) CABLE,SMA PL-SMB PL,RG316,11cm $7910-SP0WP011 1 (Reference Input Opt. Enhanced Synth) CABLE, SMA PLUG-PLUG, RG316, 19 cm $7910-SP0SP019 1 (Reference Input Opt.
  • Page 78 6.1.3 MT-3 Front Panel Board Electrical Parts List Desig Description Part No. LED, RED, 5 mm OD, T-1 3/4 2010-503001RD HEADER, 0.1", RA, 2 ROW X 2 PIN 5010-H202RA9T HEADER, 0.1", RA, 2 ROW X 2 PIN 5010-H202RA9T SWITCH, TOG/DPDT, ON-OFF-ON, PCB/STR 5215-T2031V02 MT-3 TX FRONT PANEL 4321-40921211...
  • Page 79 Desig Description Part No. CAP., 1.0µF FILM, MMK5, 10%, 50V 1016-6D105K50 CAP., 150nF FILM, MMK5, 10%, 63V 1016-5B154K63 CAP., N/I NOT INSTALLED CAP., 4.7nF FILM, MMK5, 10%, 63V 1016-3A472K63 CAP., 330nF FILM, MMK5, 10%, 50V 1016-5B334K50 C47, C48 CAP., 1.0µF FILM, MMK5, 10%, 50V 1016-6D105K50 CAP., SM, 10nF CER,0805,X7R,50V 1008-4A103K5R...
  • Page 80 POT., SM/4mm SQ, 100k 11T, SIDE ADJUST 1174-DM4104J0 RES., SM, 221k 0805, 1%, 100ppm 1150-5A2213FP RES., SM, 1k50 0805, 1%, 100ppm 1150-3A1501FP RES., SM, 11k8 0805, 1%, 100ppm 1150-4A1182FP POT., SM/4mm SQ, 5k 11T, SIDE ADJUST 1174-DM2502J0 RES., SM, 11k8 0805, 1%, 100ppm 1150-4A1182FP POT., SM/4mm SQ, 5k 11T, SIDE ADJUST 1174-DM2502J0...
  • Page 81 Desig Description Part No. CAP., SM, 100nF CER., 0805, X7R, 50V 1008-5A104K5R CAP., SM, 1.0nF CER., 0805, X7R, 50V 1008-3A102K5R C15, C17 CAP., SM, 10nF CER,0805,X7R,50V 1008-4A103K5R C18, C20 CAP., SM, 100nF CER,0805,X7R,50V 1008-5A104K5R C21, C22 CAP., 10nF FILM, MMK5, 10%, 63V 1016-4A103K63 CAP., 22nF FILM, MMK5, 10%, 63V 1016-4A223K63...
  • Page 82 Desig Description Part No. RES., SM, 2k21 0805, 1%, 100ppm 1150-3A2211FP R21, R22 RES., SM, 49k9 0805, 1%, 100ppm 1150-4A4992FP R23, R24 RES., SM, 5k11 0805, 1%, 100ppm 1150-3A5111FP R25, R26 RES., SM, 3k48 0805, 1%, 100ppm 1150-3A3481FP R27, R28 RES., SM, 13k3 0805, 1%, 100ppm 1150-4A1332FP POT., SM/4mm SQ, 50k 11T, SIDE ADJUST...
  • Page 83 New Transmitter Main Board . Also, the Front Panel Board is now easier to configure if new microphones (other than Daniels microphones) are used. The new FPB can be used on the old TX-3 main - all options will function.
  • Page 84 ISSUE DATE REVISION Nov 98 Updated the DE logo and added the statuary trademark statement to the title page. Updated the Low Frequency Modulation section 3.11 to reflect the in house document A0361-06. Transmitter Main Board Instruction Manual...
  • Page 85 A22-VAP130 AM Audio Processor Version 04 Copyright © 2000 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels Electronics Ltd DE™...
  • Page 86 NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
  • Page 87 TABLE OF CONTENTS Page FM AUDIO PROCESSOR .....................1-1 Introduction ......................1-1 Block Diagram (FM Audio Processor)..............1-3 FM Audio Processor Board Pin Connections............1-4 Factory Configuration...................1-4 Turn-on Time......................1-5 Low Frequency Modulation..................1-5 Transmitter Standby Modes..................1-5 SIGNALS.........................2-1 FM Audio Processor Outputs................2-1 Modulation Output ....................2-1 Low Frequency / Direct Mod. Output..............2-1 Microphone Input....................2-1 Balanced Input......................2-1 Auxiliary Input......................2-2...
  • Page 88 Audio Circuits.......................9-6 Power Requirements .....................9-6 Transmitter Standby Modes..................9-6 Audio Circuitry.....................9-7 AM Audio Processor Factory Configuration............9-8 AM Audio Processor Alignment................9-8 9.10 AM Audio Processor Electrical Parts List............9-11 9.11 AM Audio Processor Component Layout............9-14 9.12 AM Audio Processor Schematic Diagram ............9-15 REVISION HISTORY....................10-1 LISTS OF FIGURES Figure 1 Block Diagram - Audio Processor...............
  • Page 89 • Temperature compensated audio output • Ability to transmit data and voice switched by a single control line. • Backwards compatible with Daniels Electronics MT-2 series transmitters. • Direct modulation input for LTR™, DCS, paging and other digital modulations that require very low frequency modulation to the synthesizer or crystal oscillator module.
  • Page 90 A continuous +9.5 VDC supply and a switched +8.0 VDC supply are required to power the module which is normally supplied by the Main Transmitter Board. The 6 audio inputs on the FM Audio Processor are: • DYNAMIC MICROPHONE INPUT •...
  • Page 91 Block Diagram (FM Audio Processor) Regulator Microphone Input Compression P1-3 Pre- emphasis Limiter/Summing Select Amplifier Splatter Filter 3 KHz Balanced Buffer Input Compression P1-1 Pre- JU11 emphasis Select Auxillary Buffer Regular Modulation Audio Pre- Buffer Switch 1 emphasis Reg Mod P3-1 Select 49K9...
  • Page 92 FM Audio Processor Board Pin Connections Surface Mount Side END VIEW +9.5V Mic Input Subtone Input 1 Voice Balanced Input And Subtone Low Frequency Direct Mod Output Output Figure 2 Pin Connection Diagram Factory Configuration The MT-3 FM Audio Processor is factory configured as follows: Table 2 Factory Configuration Parameter...
  • Page 93 Turn-on Time This measurement is made with the standard factory settings with a 1 kHz tone applied to the balanced input. The turn-on time is the time it takes the FM Audio Processor to output a stable audio signal to P3-1 from the time its power (+8.0 VDC) is switched on. The turn-on time can be virtually eliminated by configuring the FM Audio Processor for continuous audio standby (see section 1.7 Transmitter Standby Modes).
  • Page 94 Notes: If FM Audio Processor JU36 is not installed, both microphone and balanced audio compression amplifiers will be disabled. This means that the front panel microphone jack will be disabled for local microphone operations. When in this condition, balanced audio is routed around the compression circuitry via JU11 (installed) with JU1 and JU2 removed.
  • Page 95 SIGNALS The MT-3 FM Audio Processor has six audio inputs, two audio outputs and one audio control input. Five of the audio inputs are used primarily for voice and tone signals. The sixth, the Direct modulation input, is used primarily for data signals. The audio control input is used to switch audio outputs so the transmitter can transmit voice or data.
  • Page 96 using the lower input levels) Like the microphone input, the balance input is limited and filtered and is output at the standard modulation output port. If no compression is required (i.e.: customer is providing their own), JU11 can be enabled providing a path through R48 (Auxiliary Input Level Control) to amplifier U2C where pre- emphasis or flat audio can then be selected from its output.
  • Page 97 THEORY OF OPERATION Voice band audio normally enters the Balanced Input at P1-1 and P1-2 while microphone audio enters at P1-3. Potentiometer R31 sets the Balanced compression level of U1B while R2 sets the microphone compression level of U1A. Each amplifier has a dynamic range of 25 dB. Jumper JU17 is only installed when using very low input levels (-20 to –25 dBm) and allows better tuning range for R31.
  • Page 98 The microphone and balanced audio signals are summed and limited by U3A. Op-amp U3B provides audio level temperature compensation (for synthesizer and crystal oscillator sensitivity variations). Due to the many different characteristics of the models of synthesizer and crystal oscillators, the components are marked “SELect” and are identified later in this document (section 4.0V 4.0V L IMIT ER...
  • Page 99 If no compression circuitry is required, the balanced input signals can be routed around the compression circuitry jumper JU11. Op-amp then would provide buffering/amplification. It’s output would normally have pre-emphasis installed but could be changed to flat if required through jumper JU9. The audio signal is then normally routed to U3A, the summing amplifier/limiter and processed as mentioned in the previous paragraphs.
  • Page 100 Voltage regulator U2A provides regulated +4.0V to all Op-amp stages. Optional potentiometer R14 can be installed (and JU15 removed) for special applications which need a voltage different than +4.0V. Data normally enters at P4-3, the Direct Modulation Input. From there, it has many routes that it can go.
  • Page 101 ALIGNMENT Verify the standard factory settings for the MT-3 FM Audio Processor as given in section 1 before beginning the standard deviation adjustment procedure. If the transmitter's operating frequency is changed beyond the factory recommended bandwidth or if the synthesizer is changed, the FM Audio Processor should be realigned to optimize the transmitter's performance.
  • Page 102 Subtone Input Setup • Apply a 100 Hz tone at -18 dBm to the subtone 1 input . • Adjust R42 (SUBTONE INPUT 1) to produce: • ±500 Hz(Wideband) or ±350 Hz(Narrowband) deviation. • Remove the signal. Balanced Input Frequency Response •...
  • Page 103 TROUBLESHOOTING - TEST EQUIPMENT NEEDED 1 Variable Power supply/supplies to supply 9.6V and 8.0V at the same time. 2 Digital Voltmeter to measure RMS AC Volts, DC Volts, DC Current and resistance. 3 20 MHz Oscilloscope, single channel. 4 Audio Signal Generator (600 Ohm Output Impedance) capable of frrequencies from 67 Hz to 5000 Hz.
  • Page 104 Subtone Input Test Change Audio Generator frequency to 100 Hz and maintain level at –18 dBm (98 mV RMS). Connect output to Subtone Input 1 (P2-2) and ground (P1-4). Refer to Table 8 Waveform Levels, for levels and waveforms that should be present. Audio benchmarks Set the audio generator to 2.4 kHz @ 0 dBm at the Balanced Input.
  • Page 105 TEMPERATURE COMPENSATION The FM Audio Processor includes temperature compensation circuitry to maintain constant transmitter audio deviation with a fixed level input signal. It is capable of not only compensating for temperature related level variations within the FM Audio Processor (typically –0.3 to –0.5 dB at –40C) but can also compensate for changes caused by the synthesizer or crystal oscillator module that is not equipped with its own temperature compensation.
  • Page 106 This Page Intentionally Left Blank Audio Processor Board Instruction Manual...
  • Page 107 Not Installed Not Installed Installed Installed Open Direct Modulation input bias select Single Open Direct Modulation Direct/Cap couple Single Open Coupling Capacitor selection Single Coupling Capacitor selection (Default) Installed Installed Installed Installed DANIELS ELECTRONICS LTD. Audio Processor Board Instruction Manual...
  • Page 108 1.0µF INPUT 1.0µF 1.0µF DC LEVEL 1.0µF ADJUST MT3APM1F DANIELS PCB 43-911923 VICTORIA B.C . ELECTRONICS ELECTRONICS TITLE: FM TX AUDIO PROCESSOR SM LAYOUT / JUMPERS TITLE: AM TRANSMITTER TITLE: AM TRANSMITTER SURFACE MOUNT LAYOUT TITLE: FM TX AUDIO PROCESSOR BOARD OUTLINE...
  • Page 109 JU20 JU42 10nF 10nF MODULATION OUTPUT 10K0 +9.5V CONTINUOUS INPUT DC LEVEL JU43 HIGHEST REFERENCE DESIGNATORS ADJUST OPTIONAL 50K0 DANIELS ELECTRONICS VICTORIA B.C. DIRECT 47uF 47uF JU45 MODULATION INPUT TITLE: MT-3 TX AUDIO PROCESSOR SCHEMATIC DIAGRAM TP13 ----- DATE: 19 APR 2000...
  • Page 110 This Page Intentionally Left Blank DANIELS ELECTRONICS LTD. Audio Processor Board Instruction Manual...
  • Page 111 FM AUDIO PROCESSOR PARTS LIST Desig Description Part No. CAP., SM, 1.0uF CER, 1206, X7R, 16V 1008-6B105Z4R CAP., SM, 1.0uF CER, 1206, X7R, 16V 1008-6B105Z4R CAP., SM, 4.7uF TANT., 10%, 16V 1055-5B475K16 CAP., SM, 1.0uF CER, 1206, X7R, 16V 1008-6B105Z4R CAP., SM, 10nF CER,0805,X7R,50V 1008-4A103K5R CAP., SM, 1.0uF TANT., 20%, 16V...
  • Page 112 Desig Description Part No. CAP., SM, 33nF CER, 0805, X7R, 50V 1008-4A333K5R FERRITE BEAD, SM, 43MIX,.18x.12 1213-43181200 HEADER 0.1", R/A, 2 ROW X 2PIN 5010-H202RA9T HEADER 0.1", R/A, 2 ROW X 2PIN 5010-H202RA9T HEADER 0.1", R/A, 2 ROW X 2PIN 5010-H202RA9T HEADER 0.1", R/A, 2 ROW X 2PIN 5010-H202RA9T...
  • Page 113 Desig Description Part No. POT., SM, 100K0 4mm SQ, 100K,11T,SIDE 1174-DM4104J0 RES., SM, 16k2 0805, 1%, 100ppm 1150-TBA RES., SM, 49K9 0805, 1%, 100ppm 1150-4A4992FP RES., SM, 10K0 0805, 1%, 100ppm 1150-4A1002FP RES., SM, 100K 0805, 1%, 100ppm 1150-5A1003FP RES., SM, N/I 0805, 1%,100ppm 1150-NOTINST RES., SM, SEL 0805, 1%, 100ppm 1150-TBA...
  • Page 114 This Page Intentionally Left Blank...
  • Page 115 AM AUDIO PROCESSOR Introduction The MT-3 AM Transmitter Main Board integrates the MT-3 Front Panel Board, MT-3 AM Audio Processor, Synthesizer or Crystal Control module and Amplifier module together to make a working MT-3 AM series transmitter. The Front Panel Board and the Audio Processor are soldered directly to the Transmitter Main Board while the Amplifier and the Synthesizer or Crystal Control module are frequency band sensitive, plug-in modules.
  • Page 116 Audio Specifications Audio Input: -30 to 0 dBm into a 600Ω balanced load. Audio Response: Flat audio; +1/-3 dB: 300 Hz - 3 kHz Audio Distortion: Less than 3% -40˚C to +60˚C at 30% modulation, Less than 5% -40˚C to +60˚C at 90% modulation Audio Circuits All of the audio signal conditioning (e.g.
  • Page 117 The actual current and start-up time may depend on the frequncy controlled source (crystal or synthesizer) and amplifier module. The current and start-up times given below are representative values intended only as a guideline. MODE 1: Jumper J6 out - the audio processor is switched by a PTT signal - the synthesizer is switched by a PTT signal - standby current typically 13 mA - start-up time typically 40 ms...
  • Page 118 AM Audio Processor Factory Configuration The MT-3 AM Transmitter Audio Processor is factory configured as follows: • Microphone Input: 1kHz tone at -10 dBm gives 50% maximum modulations. • Audio Balanced Input: 1 kHz tone at -8 dBm gives 90% maximum modulations.
  • Page 119 10 Apply a 1 kHz, -8 dBm input signal, the modulation should be 90%, observe that the distortion of the transmitted signal is within 5.0%. 11 Slowly increase the input audio signal level to 5 dBm and observe that the modulation does not go over 100%.
  • Page 120 This Page Intentionally Left Blank 9-10...
  • Page 121 9.10 AM Audio Processor Electrical Parts List Design Description Part No. CAP., SM, 4.7nF CER., 1206, X7R 1008-3B472K5R CAP., 470nF FILM, MMK5,10%,63V 1016-5D474K63 CAP., SM, 680nF TANT., 10%, 35V 1055-4B684K35 CAP., 470nF FILM, MMK5,10%,63V 1016-5D474K63 CAP., SM, 100nF CER., 0805, X7R, 50 1008-5A104K5R CAP., SM, 10nF CER., 0805, X7R 1008-4B103K5R...
  • Page 122 Design Description Part No. POT., SM, 5K0 4mm SQ, 11T,SIDE 1174-DM2502J0 RES., SM, 20K0 0805, 1%,100ppm 1150-4A2002FP RES., SM, 49K9 0805, 1%,100ppm 1150-4A4992FP POT., SM, 50K0 4mm SQ, 50K, 11T,SIDE 1174-DM3503J0 RES., SM, 30K9 0805, 1%,100ppm 1150-4A3092FP RES., SM, 100K0 0805, 1%,100ppm 1150-5A1003FP TEMPSISTOR, 1K2 PTC, 10%,AXIAL 1181-3AGD122K...
  • Page 123 This Page Intentionally Left Blank DANIELS ELECTRONICS LTD. Audio Processor Board Instruction Manual 9-13...
  • Page 124 10k0 27K4 TP 3 18k2 51k1 TP 4 15k4 15k4 4k75 - JUMPERS INSTALLED Solder Side DANIELS DANIELS MT3AMTXM8C - COMPONENTS NOT INSTALLED ELECTRONICS ELECTRONICS ELECTRONICS ELECTRONICS VICTORIA B.C . VICTORIA B.C . TITLE: TX AM AUDIO PROCESSOR LAYOUT TITLE: AM TRANSMITTER THROUGH HOLE LAYOUT...
  • Page 125 4.7uF 4.7uF Balanced Input 680nF 8.0V Level Adjust 3M30 9.5V 9.5 Vdc P8 -1 J7-1 OPTIONAL P7 -1 J6 -1 J8 -1 P9 -1 MT-3 TX TIME-OUT-TIMER J5 -1 P6 -1 DANIELS ELECTRONICS LTD. Audio Processor Board Instruction Manual 9-15...
  • Page 126 This Page Intentionally Left Blank DANIELS ELECTRONICS LTD. 9-16 Audio Processor Board Instruction Manual...
  • Page 127 REVISION HISTORY ISSUE DATE REVISION Oct 2000 First Issue. Nov 2000 Second Issue Incorporated the AM Audio Processor documentation into this manual. For specific AM revision history, see manual IM22-MT3AMTXMN-4IM Audio Processor Board Instruction Manual 10-1...
  • Page 128 This Page Intentionally Left Blank 10-2 Audio Processor Board Instruction Manual...
  • Page 129 Covers models: VT-3/150 Amplifier Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels Electronics Ltd.
  • Page 130 NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
  • Page 131 TABLE OF CONTENTS Page GENERAL........................1-1 Introduction .......................1-1 Performance Specification .................1-1 THEORY OF OPERATION..................2-1 Amplifier Operation...................2-1 Power Requirements..................2-1 RF Circuitry.......................2-2 2.3.1 VT-3/150 Lowpass Filter...............2-2 Power Control Circuitry..................2-2 Power Sensing Circuitry..................2-3 2.5.1 Output Power Sense ................2-3 2.5.2 VSWR Sense..................2-3 2.5.3 VSWR Overload..................2-4 VT-3/150 AMPLIFIER ALIGNMENT.................3-1 General......................3-1 Repair Note......................3-1...
  • Page 132 PARTS LISTS.......................5-1 VT-3/150 Amplifier Electrical Parts List............5-1 VT-3/150 Low Pass Filter Electrical Parts List ..........5-3 VT-3/150 Amplifier Mechanical Parts List ............5-3 REVISION HISTORY....................6-1 VHF Amplifier Instruction Manual VT-3 132 - 174 MHz...
  • Page 133 RF Exposure Warning This transmitting equipment conforms to SAR (Specific Absorption Rate) limits regarding exposure of human beings to radio frequency electromagnetic energy, as defined in the following national and international standards and guidelines: Industry Canada Radio Standards Specification 102 (RSS-102), Evaluation Procedure for Mobile and Portable Radio Transmitters with respect to Health Canada’s Safety Code 6 for Exposure of Humans to Radio Frequency Fields;...
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  • Page 135 GENERAL Introduction The VT-3/150 Amplifier provides the final stage of RF amplification and filtering for the entire VHF Transmitter VT-3 132 - 174 MHz family. The amplifier has two distinct frequency ranges: 132 to 150 MHz, and 150 to 174 MHz with continuously adjustable 2.0 to 8.0 Watts output power. The VT-3/150 Amplifier is housed in a machined aluminum case that ensures optimum RF shielding, provides a good ground, and also acts as a heatsink.
  • Page 136 Transmitter Mismatch Protection: 20:1 VSWR at all phase angles. Transmitter Alarm: Forward power sense and reverse VSWR; - open collector output (separate or 'OR'ed configuration); -linear output (separate lines only). Operating Temperature Range: -30˚ C to +60˚ C, optional -40˚ C temperature test. Operating Humidity: 95% RH (non-condensing) at +25˚...
  • Page 137 THEORY OF OPERATION Amplifier Operation A power control circuit monitors the RF output power of amplifier U4 and keeps the power constant. The output power from the high power amplifier will change as the unregulated +13.8 Vdc supply varies. Note that the frequency band does not change how the amplifier operates; it only changes a few component values in the RF circuitry.
  • Page 138 RF Circuitry The RF circuitry consists of several blocks: a 7 dB input pad (R1, R2, and R3), an RF amplifier module (U4), an output power boosting transistor (Q7), three directional couplers (TL1, TL3, and TL4), and the VT-3/150 Lowpass Filter. The heart of the VT-3/150 Amplifier is RF amplifier module U4.
  • Page 139 Power Sensing Circuitry The VT-3/150 Amplifier is equipped with output power and VSWR sensing lines which can be individually configured as open collector or linear outputs. In open collector configuration, the output is active low, that is, when a fail condition is detected (not enough output power or too high antenna VSWR) the open collector transistor is turned on.
  • Page 140 2.5.3 VSWR Overload The VSWR overload circuit protects the VT-3/150 Amplifier from excessive antenna VSWR by reducing the amplifier's gain (output power) when an overload condition occurs. The VSWR overload circuit (R14, R37, R39, R40, U2a, and Q6) is an extension of the VSWR sense circuit and operates the same as the VSWR sense open collector circuit.
  • Page 141 VT-3/150 AMPLIFIER ALIGNMENT General Connections to the power supply, alarm and transmit enable lines (ENA), are clearly marked on the amplifier case. The amplifier is enabled when the enable line (ENA) is grounded. If the amplifier is installed in the transmitter, alignment is simplified by using an SR-3 Subrack, SM-3 System Monitor, and RF extender cable to provide transmitter power and signal interconnection (see the Transmitter Main Board Manual for details).
  • Page 142 • PCB number 43-912010 indicates circuitboard version 1.0; • PCB number 50002-02 indicates circuitboard version 2.0. All PCB's manufactured by Daniels Electronics are identified by one of the above conventions. Standard Factory Settings and Jumper Configuration The VT-3/150 Amplifier is factory configured as follows: •...
  • Page 143 3.6.2 VT-3/150 Amplifier Adjustment The Amplifier alignment consists of two adjustment procedures; (i) a general set up (section 3.6.2.1) procedure which sets up the proper bias conditions for the RF transistors and (ii) the RF threshold adjustments which set up the desired alarm threshold levels as well as the RF output power.
  • Page 144 Monitor the +9.5 Vdc and 13.8 Vdc supply current and adjust R7, the output power adjustment, so that approximately 1 Amp is being drawn on the +9.5 Vdc line and 1.3 Amps or less is being drawn on the 13.8 Vdc line. This should produce approximately 8 Watts.
  • Page 145 3.6.2.3 Output Power Turn R7, the output power adjustment, clockwise to the desired transmitter output power. 3.6.2.4 Antenna VSWR Alarm (Reverse Power) Open Collector Output * note: the antenna VSWR alarm output is factory configured as an open collector output so a pull-up resistor may be required on transmitter pin Z26 if one is not already present.
  • Page 146 3.6.2.5 Antenna VSWR Overload Disconnect the radio communications test set and so that the amplifier is terminated with an open circuit. Monitor the current from the +9.5 Vdc supply. Adjust R37, the VSWR overload adjustment, clockwise until a noticeable drop in the +9.5 Vdc current occurs.
  • Page 147 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS This Page Intentionally Left Blank DANIELS ELECTRONICS VHF Amplifier Instruction Manual VT-3 132 - 174 MHz...
  • Page 148 47uF 100nF 150p 1.5uH 49K9 SELECT 10nF SELECT DANIELS VICTORIA B.C . ELECTRONICS VT3AMPM1 TITLE: VT-3/150 AMPLIFIER SM DESIGNATION (HIGH POWER) VT-3/150 AMPLIFIER TH LAYOUT (LOW POWER) VT-3/150 AMPLIFIER TH DESIGNATION (LOW POWER) VT-3/150 AMPLIFIER TH LAYOUT AND DESIGNATION (HIGH POWER)
  • Page 149 OUTPUT ALARM 1k00 ADJUST ADJUST BC817-25 10k0 1k00 221k HIGHEST REFERENCE DESIGNATORS J2, JU5 TL5, TP5 DANIELS ELECTRONICS VICTORIA B.C. FB3, FIL5 TITLE: VT-3/150 VHF AMPLIFIER SCHEMATIC DIAGRAM UNUSED REFERENCE DESIGNATORS DATE: 4 MARCH 1994 DWN BY: REX WONG APRVD:...
  • Page 150 This Page Intentionally Left Blank DANIELS ELECTRONICS VHF Amplifier Instruction Manual VT-3 132 - 174 MHz...
  • Page 151 VT-3/150 VHF Lowpass Filter Component Layout invisible text VT-3/150 VHF Lowpass Filter Schematic Diagram VHF Amplifier Instruction Manual VT-3 132 - 174 MHz...
  • Page 152 This Page Intentionally Left Blank VHF Amplifier Instruction Manual VT-3 132 - 174 MHz...
  • Page 153 PARTS LISTS VT-3/150 Amplifier Electrical Parts List Desig Description Part No. CAP., SM, 1nF CER, 1206, C0G 1008-3B102K1G C2-C5 CAP., SM, 18nF CER, 1206, X7R 1008-4B183K5R CAP., SM, 4.7µF TANT., 10%, 16V 1055-5B475K16 CAP., SM, 100nF CER, 1206, X7R 1008-5B104K5R CAP., SM, 1nF CER, 1206, C0G 1008-3B102K1G CAP., SM, 18nF CER, 1206, X7R...
  • Page 154 Desig Description Part No. FERRITE BEAD, SM, 43 MIX 1812 PKG 1213-43181200 FB2, FB3 FERRITE BEAD, 64MIX 3X3.5mm OD 1210-64030350 FIL1-FIL5 FILTER, EMI PI/5500pF, 8-32 UNC 1302-P552D10D CONNECTOR, SMB, JACK,2 HOLE FLANGE 5120-J2SC01BG CONNECTOR, N JACK PANEL MNT, C/SNK 5184-10923011 L1-L3 INDUCTOR, SM., 180nH 20%, 1812 1255-2GR1800M...
  • Page 155 Desig Description Part No. R38, R39 RES., SM, 1k00 1206, 1%, 100ppm 1150-3B1001FP RES., SM, 221k 1206, 1%, 100ppm 1150-5B2213FP RES., SM, 10k0 1206, 1%, 100ppm 1150-4B1002FP RES., SM, 1k00 1206, 1%, 100ppm 1150-3B1001FP RES., SM, 27k4 1206, 1%, 100ppm 1150-4B2742FP RES., SM, 10k0 1206, 1%, 100ppm 1150-4B1002FP...
  • Page 156 Description Part No. Qty. SCREW, M3 X 8, CAP SOCK-M2.5, S/S 5812-3M0SA08S SCREW, M3 X 8, CAP SOCK-M2.5, S/S 5812-3M0SA08S SET SCREW, M3 X 3, HEX SOCKET, A2 5817-3M0AC03S SHOULDER WASHER, M3 0.24" OD, NYLON 5674-120N2440 TUBING, TFE-260C, 22AWG,Thin 5mm 7610-260C22TW TURRET TERMINAL, 4-40 0.188L, Tn 5053-144M188T...
  • Page 157 REVISION HISTORY ISSUE DATE REVISION Jul 97 First Issue. VHF Amplifier Instruction Manual VT-3 132 - 174 MHz...
  • Page 158 ISSUE DATE REVISION VHF Amplifier Instruction Manual VT-3 132 - 174 MHz...
  • Page 159 Daniels Electronics Ltd. DE™ is a registered trademark of Daniels Electronics Ltd. registered in the United States Patent and Trademark Office. Issue:...
  • Page 160 NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. The equipment covered by this manual may incorporate minor changes in detail from the information contained in this manual.
  • Page 161 TABLE OF CONTENTS Page GENERAL........................1-1 Introduction ....................1-1 OS(R/T)-3(A/H) Enhanced Synthesizer Family Models ........1-1 Performance Specifications................1-3 Printed Circuit Board Numbering Convention..........1-5 THEORY OF OPERATION..................2-1 Internal Power and Control (Digital Board)............2-1 Synthesizer Analog Circuitry (Analog Board) ..........2-1 2.2.1 Common Analog Board Circuitry............2-1 2.2.2 29 - 71.4 MHz Analog Board Circuitry..........2-3 2.2.3...
  • Page 162 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS ..........4-1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Diagrams ........4-1 4.1.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Component Layout (Bottom)4-1 4.1.2 OS(R/T)-3H 29 - 71.4 MHz Analog Board Component Layout (Top) 4-2 4.1.3 OS(R/T)-3H 29 - 71.4 MHz Analog Board Schematic Diagram..4-3 OS(R/T)-3A 118 - 159.4 MHz Analog Board Diagrams........4-5 4.2.1 OS(R/T)-3A 118 - 159.4 MHz Analog Board Component Layout (Bottom)
  • Page 163 GENERAL This is hidden text. Introduction The OS-3A/H Synthesizer is a compact, fully shielded and environmentally rugged frequency synthesis module that is the nucleus of every MT-3 synthesized Receiver and Transmitter radio module. The OS-3A/H generates a high stability, low distortion radio frequency signal in one of several frequency bands, including 29 - 50 MHz, 118 - 159.4 MHz, 118 - 174 MHz and 406 - 470 MHz.
  • Page 164 Frequency Band: 118 - 159.4 MHz, AM Multichannel OS-3H1xx Analog Board • OST-3A128 - installed in AM transmitter, 118 - 138 MHz RF output. • OSR-3A149 - installed in AM receiver, 139.4 - 159.4 MHz RF output. Frequency Band: 128 - 174 MHz, Common OS-3H1xx Analog Board •...
  • Page 165 Performance Specifications Type: Narrow band FM, Single loop synthesizer module utilizing low noise VCO and PLL technology. Compatible with Daniels MT-3 series Transmitter and Receiver modules. Frequency Range: 29 MHz - 38 MHz [±0.5 MHz] (OST-3H035) 38 MHz - 50 MHz [±1.0 MHz]...
  • Page 166 Modulation Sensitivity: 3.0 kHz peak deviation (400 mVrms input) External Reference Input: External reference input signal via SMB connector J1 Input level 0 dBm ±3 dB Input impedance 50Ω Input frequency 10.0 MHz or 9.6 MHz (selectable through digital board jumper JU1) Power Requirements: Normal Configuration: +9.5 Vdc @ 160 mA for FM and 65 mA for AM...
  • Page 167 Printed Circuit Board Numbering Convention To expedite troubleshooting and maintenance procedures, Daniels Electronics Ltd. has adopted a printed circuit board (PCB) numbering convention in which the last two digits of the circuit board number represent the circuit board version. All PCB's manufactured by Daniels Electronics Ltd.
  • Page 168 This Page Left Intentionally Blank Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz...
  • Page 169 THEORY OF OPERATION This is hidden text. Internal Power and Control (Digital Board) Refer to "OS(R/T)-3(A/H) Digital Board Schematic Diagram" on page 4-19 of this manual. The synthesizer operates from a +9.5 Vdc power source applied to connector pin P1-2. Total current draw is approximately 160 mA for FM synthesizers and 65 mA for AM synthesizers.
  • Page 170 10.0 MHz and is selected via jumper JU2 on the Digital Board (9.6 MHz with JU2 not installed, 10.0 MHz with JU2 installed). If an external signal is used as the reference source, it must be a sinusoidal, low phase noise, high stability signal of 0 dBm ±3 dB level. A poor quality reference source will degrade receiver /transmitter performance to unacceptable levels.
  • Page 171 2.2.2 29 - 71.4 MHz Analog Board Circuitry Refer to the "OS(R/T)-3H 29 - 71.4 MHz Analog Board Schematic Diagram" on page 4-3 of this manual. Field effect transistor Q5 forms part of the negative resistance VHF amplifier oscillator that is tuned on-frequency by the combination of resonator L5 and the total capacitive reactance presented across L5 through capacitors C62, C63, C64, C23 (Select), variable capacitor C24 and varactor diodes D1 and D2.
  • Page 172 and D2. Coarse frequency adjustment is provided by varactor diodes D6, D7. SELECT capacitor values C40 and/or C23 are chosen to position the operating frequency in one of two bands; 118 - 138 MHz or 139.4 - 159.4.MHz. Varactor diodes D1 and D2 provide fine oscillator frequency control.
  • Page 173 established by the resistive dividers R21 and R22, allows low deviation (less than 5 kHz) direct frequency modulation of the VCO output signal. The PLL low-pass filter is formed by SELECT components C37, C38, C39, C45, R32 and R36. The loop filter response is optimized for switching time, noise and modulation requirements specific to each sub-band within the 128 - 174 MHz frequency range.
  • Page 174 For example, if all CHANNEL SELECT lines are pulled high, (i.e. binary ‘1111’) then the 15 frequency entry in the internal channel table will be selected. The channel table is normally pre- programmed at the factory to user specifications, but may be programmed in the field using Daniels SYNTHESIZER CHANNEL PROGRAMMER (CP-SC-3).
  • Page 175 In transmitters, the synthesizer operating frequency is the transmitter operating frequency; however, for receivers, an IF Offset correction factor must be added to or subtracted from the synthesizer operating frequency in order to determine the actual receive frequency. For VHF and UHF Receivers, the IF Offset correction factor is 21.4 MHz, while for 800 and 900 MHz Receivers it is 45 MHz.
  • Page 176 ((7205-5000) x 6.25 kHz) + 150 MHz) = 163.78125 MHz 8.333 kHz Channelization. Daniels AM synthesizers have been designed to generate frequencies in 8.333 kHz increments. In North America, AM channels and operating frequencies are allocated in triples of 8.333 kHz (i.e.
  • Page 177 12.5 kHz Channelization. The operating frequency for Synthesizers having 12.5 kHz channelization is determined as follows: •Multiply the BCD switch setting by 12.5 kHz and add the result to the synthesizer base frequency. Example: An OST-3H418 synthesizer has a base frequency of 406 MHz. selected channel number is 1660.
  • Page 178 This Page Intentionally Left Blank 2-10 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz...
  • Page 179 SYNTHESIZER ALIGNMENT This is hidden text. General OS(R/T)-3(A/H) enhanced synthesizer alignment is simplified by using a Type 84 subrack and RF extender card/cable of providing receiver or transmitter power and signal interconnection. Alternately, +9.5 Vdc may be directly connected to a receiver or transmitter module with the positive connection on pins B6 / Z6 and the negative connection on pins B30 / Z30 / B32 / Z32.
  • Page 180 The corresponding internal synthesizer jumper settings are: Digital Board • Jumper JU2 not installed 9.6 MHz internal frequency reference selected • Jumper JU1 installed AM Multichannel mode selected Analog Board • Jumper JU1: 'B' position Internal frequency reference selected • Jumper JU2 not installed Internal frequency reference selected...
  • Page 181 3.5.3 Synthesizer Removal and Installation The synthesizer module is secured to the main board (MT-3 Receiver IF/Audio Board or MT-3 Transmitter Main board) with a single counter sunk Phillips machine screw accessible from the top cover. Remove this screw to remove the synthesizer module.
  • Page 182 The measured RF output signal should be within ±1.0 ppm of the specified oscillator frequency at an output level of +5 dBm. Note that unlocked synthesizer operation will be indicated by an unstable or spurious RF output signal. The "Unlocked" red LED will also be illuminated when the PLL is unlocked.
  • Page 183 unlocked operation. The tuning range capability of all synthesizer models is listed in the Specifications section (1.3) of this manual. 3.5.5.2 VHF OS(R/T)-3A 118 - 159.4 MHz Alignment Refer to the "OS(R/T)-3A 118 - 159.4 MHz Analog Board Component Layout" diagram and the "OS(R/T)-3A 118 - 159.4 MHz Analog Board Schematic Diagram"...
  • Page 184 3.5.5.4 UHF OS(R/T)-3H 406 - 470 MHz VCO Alignment Refer to the "OS(R/T)-3H 406 - 470 MHz Analog Board Component Layout" diagram and the "OS(R/T)-3H 406 - 470 MHz Analog Board Schematic Diagram" on pages 4-13, 4-14 and 4-15 of this manual.
  • Page 185 3.5.6 Jumper Configuration Solder jumpers are clearly marked on both synthesizer digital and analog circuit boards. Refer to "OS(R/T)-3(A/H) Digital Board Component Layout (Bottom)" diagram on page 4-17 of this manual and the applicable "OS(R/T)-3(A/H) Analog Board Component Layout (Top)" diagram on page 4-18 for jumper locations.
  • Page 186 This Page Intentionally Left Blank Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz...
  • Page 187 68 nF Not Installed 10µH 260 nH 197 nH 138 nH OS3050M1 PCB 50038-02 DANIELS VICTORIA, B.C. ELECTRONICS TITLE: OS-3H050 ANALOG BOARD THROUGH HOLE BOTTOM LAYOUT TITLE: OS-3H050 ANALOG BOARD THROUGH HOLE BOTTOM DESIGNATION DATE: FEB 26, 1997 BOARD No.: 50038-02...
  • Page 188 10R0 4.7µF PCB 50038-02 OS3050M2B JU1 position B selected for internal 9.6 MHz DANIELS ELECTRONICS VICTORIA, B.C. TITLE: OS-3H040 ANALOG BOARD SURFACE MOUNT TOP LAYOUT TITLE: OS-3H040 ANALOG BOARD GENERIC SM TOP DESIGNATIONS TITLE: OS-3H040 ANALOG BOARD TH TOP LAYOUT...
  • Page 189 10K0 * Thru Hole Component AGND OPL550 10K0 DATA INPUT HIGHEST REFERENCE DESIGNATORS 10K0 10K0 LOCK DETECT AGND DANIELS OP140A LED1 ELECTRONICS VICTORIA B.C. TCXO1 BC807 1.0uF LOCK DETECT TITLE: OS(R/T)-3H 29 - 71.4 MHz ANALOG BOARD SCHEMATIC DIAGRAM OUTPUT...
  • Page 190 This Page Intentionally Left Blank DANIELS ELECTRONICS Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz...
  • Page 191 1.0 µF 330 nF 470 nF 2.2 nF 22 nF 10uH OS3150M1A DANIELS ELECTRONICS VICTORIA, B.C. TITLE: OS-3A130 ANALOG BOARD OUTLINE TITLE: OS-3A130 ANALOG BOARD BOTTOM THROUGH HOLE LAYOUT TITLE: OS-3A130 ANALOG BOARD BOTTOM THROUGH HOLE DESIGNATIONS DATE: APR 18, 1999 BOARD No.:...
  • Page 192 Not Installed Not Installed 8.2pF D6-SMV1212-004, D7-N/I D6,D7 D6,D7 D6,D7 SMV1211 SMV1211-001 DANIELS 220Ω 330Ω ELECTRONICS VICTORIA, B.C. 39K2 68K1 TITLE: OS-3A130 ANALOG BOARD TOP THROUGH HOLE LAYOUT TITLE: OS-3A130 ANALOG BOARD TOP THROUGH HOLE DESIGNATIONS TITLE: OS-3A130 ANALOG BOARD OUTLINE...
  • Page 193 DATA INPUT HIGHEST REFERENCE DESIGNATORS +5VA 100nF 10K0 10K0 LOCK DETECT AGND AGND OP140A LED1 DANIELS ELECTRONICS VICTORIA B.C. TCXO1 BC807 LOCK DETECT 1.0uF OUTPUT TITLE: OS(R/T)-3(A/H) 118 - 159.4 MHz ANALOG BOARD SCHEMATIC DIAGRAM UNUSED REFERENCE DESIGNATORS ACTIVATED WHEN...
  • Page 194 This Page Intentionally Left Blank DANIELS ELECTRONICS Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz...
  • Page 195 NOT INSTALLED 470 nF 220 nF 33 nF 22 nF 10µH PCB 50025-02 OS3150M1B DANIELS ELECTRONICS VICTORIA, B.C. TITLE: OS-3H ANALOG BOARD THROUGH HOLE BOTTOM LAYOUT TITLE: OS-3H ANALOG BOARD THROUGH HOLE BOTTOM DESIGNATION DATE: MARCH 22, 1996 BOARD No.: 50025-02...
  • Page 196 OS3150M2C JU1 position B Selected Select components for internal 9.6 MHz Factory Installed Jumpers DANIELS ELECTRONICS VICTORIA, B.C. TITLE: OS-3H150 ANALOG BOARD SURFACE MOUNT TOP DESIGNATIONS TITLE: OS-3H150 ANALOG BOARD ECO #584 CHANGES TITLE: OS-3H ANALOG BOARD THROUGH HOLE LAYOUT...
  • Page 197 AGND OPL550 * - Surface Mount Components 10K0 DATA INPUT HIGHEST REFERENCE DESIGNATORS 10K0 10K0 LOCK DETECT AGND DANIELS OP140A LED1 ELECTRONICS VICTORIA B.C. TCXO1 BC807 1.0uF LOCK DETECT TITLE: OS(R/T)-3(A/H) 128.6 - 174 MHz ANALOG BOARD SCHEMATIC DIAGRAM OUTPUT...
  • Page 198 This Page Intentionally Left Blank DANIELS ELECTRONICS 4-12 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz...
  • Page 199 15 nF 0 Ω Wire Jumper Not Installed 100nF Not Installed PCB 50028-02 OS3450M1C DANIELS ELECTRONICS VICTORIA, B.C. TITLE: OS-3H ANALOG BOARD THROUGH HOLE BOTTOM LAYOUT TITLE: OS-3H ANALOG BOARD THROUGH HOLE BOTTOM DESIGNATION DATE: MARCH 22, 1996 50028-02 BOARD No.:...
  • Page 200 * - INDICATES JUMPERED TO 5VA OS3450M2B PCB 50028-02 JU1 position B selected for internal 9.6 MHz DANIELS ELECTRONICS VICTORIA, B.C. TITLE: UHF OS-3H ANALOG BOARD SURFACE MOUNT TOP LAYOUT TITLE: OS-3H UHF ANALOG BOARD SURFACE MOUNT TOP DESIGNATIONS TITLE: UHF OS-3H ANALOG BOARD THOUGH HOLE TOP LAYOUT...
  • Page 201 MC145202* or MC145193* MC145190 AGND OPL550 * - INDICATES JUMPERED TO +5VA 10K0 DATA INPUT HIGHEST REFERENCE DESIGNATORS 10K0 10K0 LOCK DETECT AGND DANIELS OP140A LED1 R58, RV1 ELECTRONICS VICTORIA B.C. J2, JU1 TCXO1 BC807 1.0uF LOCK DETECT TITLE: OS(R/T)-3H 406 - 470 MHz ANALOG BOARD SCHEMATIC DIAGRAM...
  • Page 202 This Page Intentionally Left Blank DANIELS ELECTRONICS 4-16 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz...
  • Page 203 REFERENCE 118-159.6 MHz REFERENCE INSTALLED INSTALLED NOT INSTALLED NOT INSTALLED DANIELS ELECTRONICS VICTORIA, B.C. DANIELS TITLE: OS-3H DIGITAL BOARD SOLDER SIDE SM VALUE / DESIGNATION ELECTRONICS TITLE: OS-3H DIGITAL BOARD SOLDER SIDE SM LAYOUT Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz DATE: 31 MARCH 1997 BOARD No.: 50021-03...
  • Page 204 221k R 30 100nF 215R 27k4 BAS16 OS3150M5B PCB 50021-03 DANIELS ELECTRONICS VICTORIA, B.C. DANIELS ELECTRONICS TITLE: OS-3H DIGITAL BOARD COMPONENT SIDE TITLE: OS-3H DIGITAL BOARD COMPONENT SIDE SM LAYOUT TITLE: OS-3H DIGITAL BOARD COMPONENT SIDE SM VALUE / DESIGNATION...
  • Page 205 100nF PTT (I/P) A(L) BAS16 DGND POWER CONTROL DGND BC817 10K0 PWCTL HIGHEST REFERENCE DESIGNATORS 332R DGND BAS16 DANIELS OPL550 DGND LOCK DETECT INPUT ELECTRONICS LOCK VICTORIA B.C. ----- ----- TITLE: OS(R/T)-3(A/H) DIGITAL BOARD SCHEMATIC DIAGRAM UNUSED REFERENCE DESIGNATORS +5VD...
  • Page 206 This Page Intentionally Left Blank DANIELS ELECTRONICS 4-20 Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz...
  • Page 207 PARTS LISTS This is hidden text. OS(R/T)-3H 29 - 71.4 MHz Analog Board Electrical Parts List Ref. Desig Description Part No. C1 - C3 CAP., SM 1.0nF CER., 0805, X7R, 50V 1008-3A102K5R CAP., SM 10nF CER, 0805, X7R, 50V 1008-4A103K5R CAP., SM 100nF CER., 0805, X7R, 50V 1008-5A104K5R CAP., SM 47uF TANT., 20%, 16V...
  • Page 208 Ref. Desig Description Part No. CAP., 68nF FILM, MMK5, 10%,63V 1016-4A683K63 OST-3H035 CAP., 68nF FILM, MMK5, 10%,63V 1016-4A683K63 OST-3H045 CAP., Not Installed Not Installed OSR-3H061 CAP., 22nF FILM, MMK5, 10%,63V 1016-4A223K63 CAP., 22uF DIP. TANT., 20%, 20V 1054-6G226M20 CAP., SM 10nF CER, 0805, X7R, 50V 1008-4A103K5R CAP., SM 330pF CER., 0805, COG 1008-2A331J1G...
  • Page 209 Ref. Desig Description Part No. Q1, Q2 TRANSISTORBC817 NPN, SOT23 2120-BC817025 TRANSISTORBC807 PNP, SOT23 2120-BC807025 TRANSISTORBC817 NPN, SOT23 2120-BC817025 JFET, J211 RF N-CHAN. TO-92 2041-J2110000 POT., SM 5K0 1T, TOP ADJ 1174-AS2502J1 RES., SM 49R9 0805, 1%,100ppm 1150-1A49R9FP RES.330R METAL FILM, 5%, 0.5W 1101-2A0331JP R3, R4 RES., SM 10K0 0805, 1%,100ppm...
  • Page 210 Ref. Desig Description Part No. U1 - U4 DIODE, OPL550 I/R SENSOR,TTL O/P,PLST 2014-1L18230T LED, OP140A I/R,GaAs,.81 x .23,PLAST. 2013-1G18230A I.C., LT1129-IS8, PROG. VOLT REG, SO8 2305-11290N08 U7, U8 I.C., LP2951 PROG. VOLT REG, SO-8 2305-29510N08 MOSFET, SI9945DY, N CHAN.,SO-8 2142-SI9945DY I.C., MC145191, PLL FREQ/SYNTH, SO-20 2355-45191N20...
  • Page 211 OS(R/T)-3A 118 - 159.4 MHz Analog Board Electrical Parts List Ref. Desig Description Part No. C1- C3 CAP., SM ,1.0nF CER., 0805, X7R, 50V 1008-3A102K5R CAP., SM, 10nF CER, 0805, X7R, 50V 1008-4A103K5R CAP., SM, 100nF CER., 0805, X7R, 50V 1008-5A104K5R CAP., SM, 47uF TANT., 20%, 16V 1055-6D476M16...
  • Page 212 Desig Description Part No. CAP., 22nF FILM, MMK5, 10%,63V 1016-4A223K63 (OSR-3A149) CAP., 2.2nF FILM, MMK5,10%,63V 1016-3A222K63 (OST-3A128) C50, C51 CAP., SM, 100nF CER., 0805, X7R, 50V 1008-5A104K5R CAP., SM, 10nF CER, 0805, X7R, 50V 1008-4A103K5R CAP., SM, 27pF CER., 0805, COG 1008-1A270J1G CAP., SM, 47pF CER., 0805, COG 1008-1A470J1G...
  • Page 213 Ref. Desig Description Part No. RES., SM, 10R0 0805, 1%,100ppm 1150-1A10R0FP RES., SM, 137K0 0805, 1%,100ppm 1150-5A1373FP R23 - R25 RES., SM, 10R0 0805, 1%,100ppm 1150-1A10R0FP RES., 1R2 METAL FILM, 5%, 0.5W 1101-0A01R2JI RES., SM, 11K8 0805, 1%,100ppm 1150-4A1182FP RES., SM, 10R0 0805, 1%,100ppm 1150-1A10R0FP RES., SM, 18K2 0805, 1%,100ppm 1150-4A1822FP...
  • Page 214 OS(R/T)-3H 128 - 174 MHz Analog Board Electrical Parts List Ref. Desig Description Part No. C1-C3 CAP., SM, 1.0nF CER., 0805, X7R, 50V 1008-3A102K5R CAP., SM, 10nF CER, 0805, X7R, 50V 1008-4A103K5R CAP., SM, 100nF CER., 0805, X7R, 50V 1008-5A104K5R CAP., SM, 47µF TANT., 20%, 16V 1055-6D476M16 CAP., SM, 10nF CER, 0805, X7R, 50V...
  • Page 215 Desig Description Part No. CAP., 33nF FILM, MMK5, 10%, 63V 1016-4A333K63 (OS-3H141) CAP., 22nF FILM, MMK5, 10%, 63V 1016-4A223K63 (OS-3H162) CAP., 22µF DIP. TANT., 20%, 20V 1054-6G226M20 CAP., SM, 10nF CER, 0805, X7R, 50V 1008-4A103K5R CAP., SM, 330pF CER., 0805, COG 1008-2A331J1G CAP., SM, 27pF CER., 0805, COG 1008-1A270J1G...
  • Page 216 Ref. Desig Description Part No. R23-R25 RES., SM, 10R0 0805, 1%,100ppm 1150-1A10R0FP RES., 1R2 METAL FILM, 5%, 0.5W 1101-0A01R2JI RES., SM, 11K8 0805, 1%,100ppm 1150-4A1182FP RES., NOT INSTALLED NOT INSTALLED RES., SM, 3K92 0805, 1%,100ppm 1150-3A3921FP RES., SM, 10R0 0805, 1%,100ppm 1150-1A10R0FP RES., SM, 49R9 0805, 1%,100ppm 1150-1A49R9FP...
  • Page 217 OS(R/T)-3H 406 - 470 MHz Analog Board Electrical Parts List Ref. Desig Description Part No. C1 - C3 CAP., SM 1.0nF CER., 0805, X7R, 50V 1008-3A102K5R CAP., SM 10nF CER, 0805, X7R, 50V 1008-4A103K5R CAP., SM 100nF CER., 0805, X7R, 50V 1008-5A104K5R CAP., SM 47uF TANT., 20%, 16V 1055-6D476M16...
  • Page 218 Desig Description Part No. CAP., SM, 10pF CER., 0805, C0G 1008-1A100J1G CAP., 100nF FILM, MMK5, 10%, 63V 1016-5A104K63 OST-3H4xx CAP., NOT INSTALLED NOT INSTALLED OSR-3H440 DIODE, BYD17J RECTIFIER,SOD87 2101-BYD17J00 DIODE, BAS16 SWITCHING, SOT23 2100-BAS16000 L1 - L3 CHOKE, RF/MOULD.10uH 10%,.25 1251-4A00100K L6 - L10 CHOKE, RF/MOULD.1.5uH 10%,.25...
  • Page 219 Desig Description Part No. RES.180R METAL FILM, 5%, 0.5W 1101-2A0181JP RES., SM 18R2 0805, 1%,100ppm 1150-1A18R2FP RES., SM 47R5 0805, 1%,100ppm 1150-1A47R5FP RES., SM 27R4 0805, 1%,100ppm 1150-1A27R4FP RES., SM 33R2 0805, 1%,100ppm 1150-1A33R2FP RES., SM 47R5 0805, 1%,100ppm 1150-1A47R5FP RES., SM 47R5 0805, 1%,100ppm 1150-1A47R5FP OST-3H418...
  • Page 220 OS(R/T)-3(A/H) Digital Board Electrical Parts List Ref. Desig Description Part No. C1,C2 CAP., SM, 100nF CER., 0805, X7R, 50V 1008-5A104K5R C3-C5 CAP., SM, 47µF TANT., 20%, 16V 1055-6D476M16 C6,C7 CAP., SM, 22pF CER., 0805, COG 1008-1A220J1G CAP., SM, 4.7µF TANT., 10%, 16V 1055-5B475K16 C9-C14 CAP., SM, 100nF CER., 0805, X7R, 50V...
  • Page 221 OS(R/T)-3(A/H) Synthesizer Mechanical Parts List Description Part No. Qty. CASE, OS-3H SYNTH. MODULE,ALUM 3702-66100920 CONN., SMB, JACK,2 HOLE FLANGE 5120-J2SC01BG FERRITE, BEAD,73 MIX, 3X3.5mm OD (CON3-CON5) 1210-73030350 3 OS-3H050 FERRITE, BEAD,43 MIX, 3X3.5mm OD (CON3-CON5) 1210-43030350 3 OS-3A130 FERRITE, BEAD,43 MIX, 3X3.5mm OD (CON3-CON5) 1210-43030350 3 OS-3H150 FERRITE, BEAD,61 MIX, 3X3.5mm OD (CON3-CON5)
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  • Page 223 REVISION HISTORY ISSUE DATE REVISION May 97 • Issue 1 Mar 98 • Changes to the AM Analog board (OST-3A128) to improve performance ECO #547. C37 was 220nF is now 100nF and C40 was 8.2pF is now not installed C45 was 33nF is now 22nF and C49 was 2.2nF is now 1.5nF R32 was 33kΩ...
  • Page 224 ISSUE DATE REVISION Aug 00 • Changes to the OS(R/T)-3(A/H) Digital board. ECO #599. R30, R31 & R32 were 332R are now 215R. • Changes to the OS-3H 406-470 MHz Analog board. ECO # 597. R48 was 27R4 is now 47R5, R49 was 33R2 is now 10R. R52 was 49R9 is now Not Installed.
  • Page 225 VT-3/140-SNA2, VT-3/160-SNA2 VT-3/140-SNA8, VT-3/160-SNA8 Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels Electronics Ltd.
  • Page 226 NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
  • Page 227 TABLE OF CONTENTS Page VT-3/140 Channel Designation Table: 132-150MHz, 5kHz Increments ......1-1 VT-3/140 Channel Designation Table: 132-150MHz, 6.25kHz Increments .....2-1 VT-3/160 Channel Designation Table: 150-174MHz, 5kHz Increments ......3-1 VT-3/160 Channel Designation Table: 150-174MHz, 6.25kHz Increments .....4-1 REVISION HISTORY.....................5-1 VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz...
  • Page 228 This Page Intentionally Left Blank VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz...
  • Page 229 VT-3/140 Channel Designation Table: 132-150MHz, 5kHz Increments Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 132.00000 132.37500 132.75000 1025 133.12500 1100 133.50000 1175 133.87500 1250...
  • Page 230 VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 1325 134.62500 1400 135.00000 1475 135.37500...
  • Page 231 VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 1850 137.25000 1925 137.62500 2000 138.00000...
  • Page 232 VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 2375 139.87500 2450 140.25000 2525 140.62500...
  • Page 233 VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 2900 142.50000 2975 142.87500 3050 143.25000...
  • Page 234 VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 3425 145.12500 3500 145.50000 3575 145.87500...
  • Page 235 VT-3/140 Channel Designation Table: 132 to 150 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 3950 147.75000 4025 148.12500 4100 148.50000...
  • Page 236 This page intentionally left blank. VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz...
  • Page 237 VT-3/140 Channel Designation Table: 132-150MHz, 6.25kHz Increments Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 5640 132.00000 5715 132.46875 5790 13 2.93750 5865 133.40625 5940 133.87500 6015 134.34375...
  • Page 238 VT-3/140 Channel Designation Table: 132 to 150 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 6165 135.28125 6240 135.75000 6315 136.21875...
  • Page 239 VT-3/140 Channel Designation Table: 132 to 150 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 6690 138.56250 6765 139.03125 6840 139.50000...
  • Page 240 VT-3/140 Channel Designation Table: 132 to 150 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 7215 141.84375 7290 142.31250 7365 142.78125...
  • Page 241 VT-3/140 Channel Designation Table: 132 to 150 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 7740 145.12500 7815 145.59375 7890 146.06250...
  • Page 242 VT-3/140 Channel Designation Table: 132 to 150 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 8265 148.40625 8340 148.87500 8415 149.34375...
  • Page 243 VT-3/160 Channel Designation Table: 150-174MHz, 5kHz Increments Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 000 150.00000 075 150.37500 150.75000 151.12500 151.50000 151.87500...
  • Page 244 VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 152.62500 153.00000 153.37500...
  • Page 245 VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 1050 155.25000 11 25 155.62500 1200 156.00000...
  • Page 246 VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 1575 157.87500 1650 158.25000 1725 158.62500...
  • Page 247 VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 2100 160.50000 2175 160.87500 2250 161.25000...
  • Page 248 VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 2625 163.12500 2700 163.50000 2775 163.87500...
  • Page 249 VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 3150 165.75000 3225 166.12500 3300 166.50000...
  • Page 250 VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 3675 168.37500 3750 168.75000 3825 169.12500...
  • Page 251 VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Cha n. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 4200 171.00000 4275 171.37500...
  • Page 252 VT-3/160 Channel Designation Table: 150 to 174 MHz, 5 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 4725 173.62500 4800 174.00000 4726...
  • Page 253 VT-3/160 Channel Designation Table: 150-174MHz, 6.25kHz Increments Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 5000 150.00000 5075 150.46875 5150 150.93750 5225 151.40625 5300 151.87500 5375 152.34375...
  • Page 254 VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 5525 153.28125 5600 153.75000 5675 154.21875...
  • Page 255 VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Freq. Cha n. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 6050 156.56250 6125 157.03125...
  • Page 256 VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Cha n. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 6575 159.84375 6650 160.31250...
  • Page 257 VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 7100 163.12500 7175 163.59375 7250 164.06250...
  • Page 258 VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 7625 166.40625 7700 166.87500 7775 167.34375...
  • Page 259 VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 8150 169.68750 8225 170.15625 8300 170.62500...
  • Page 260 VT-3/160 Channel Designation Table: 150 to 174 MHz, 6.25 kHz Increments (continued) Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Chan. Freq. Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) Num. (MHz) 8675 172.96875 8750 173.43750 8825 173.90625...
  • Page 261 REVISION HISTORY ISSUE DATE REVISION May 98 • Issue 1 VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz...
  • Page 262 This Page Intentionally Left Blank. VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz...

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