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RF Technology T220 Operation And Maintenance Manual

Eclipse series
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Eclipse Ser ies
RF Technology
rfinfo@rftechnology.com.au
SEPTEMBER 2003 Revision 2
T220 Tr ansmitter
Operation and Maintenance Manual
This manual is produced by RF Technology Pty Ltd
10/8 Leighton Place, Hornsby 2077 Australia
Copyright © 2001 RF Technology Pty Ltd

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  • Page 1 Eclipse Ser ies RF Technology rfinfo@rftechnology.com.au SEPTEMBER 2003 Revision 2 T220 Tr ansmitter Operation and Maintenance Manual This manual is produced by RF Technology Pty Ltd 10/8 Leighton Place, Hornsby 2077 Australia Copyright © 2001 RF Technology Pty Ltd...

  • Page 2: Table Of Contents

    PLL Section Power Amplifier Temperature Protection 600Ω line Input Direct Coupled Audio Input Local Microphone Input CTCSS and Tone Filter Audio Signal Processing 5.10 PTT and DC Remote Control 5.11 Microprocessor Controller 5.12 Voltage Regulator Page 2 RF Technology T220...
  • Page 3 HI-Z Input 7.4.16 Test Microphone Input 7.4.17 External Tone Input 7.4.18 External ALC Input 7.4.19 T/R Relay Driver 7.4.20 Channel Select Input / Output 7.4.21 DC Remote Keying 7.4.22 Programmable No-Tone Period 7.4.23 Firmware Timers RF Technology T220 Page 3...
  • Page 4 CONTENTS CONTENTS 7.4.24 CTCSS Connectors 7.5.1 Antenna Connector 7.5.2 Power and I/O Connector 7.5.3 Test Connector Engineering Diagrams Block Diagram Circuit Diagrams Component Overlay Diagrams Parts List Page 4 RF Technology T220...

  • Page 5: Operating Instructions

    1 OPERATING INSTRUCTIONS WARNING Changes or modifications not expressly approved by RF Technology could void your authority to operate this equipment. Specifications may vary from those given in this document in accordance with requirements of local authorities. RF Technology equipment is subject to...

  • Page 6: Pwr Led

    LED flash rate to indicate the alarm condition. Refer to table 2. 1.1.6 ALC LED The ALC LED indicates that the transmitter output power is being controlled by an external amplifier through the external ALC input. Page 6 RF Technology T220...

  • Page 7: Ref Led

    (enabled) 1-2 * dc loop not connected (bypassed) J P4: Audio Input Sour ce Either the 600Ω or the high-Z balanced inputs may be selected. Condition Position 2-3 * 600Ω Input High-impedance Input RF Technology T220 Page 7...

  • Page 8: Jp5: 600¿ Termination

    The exciter can source the current and an external device can provide the dc loop. These three jumpers select the appropriate mode. Condition J P9 J P10 J P11 Current Loop Input OFF * 12Vd Loop source Page 8 RF Technology T220...

  • Page 9: Jp16: Direct Digital Input (Rev 4 Or Higher)

    The ALARM signal when asserted is low active; when unasserted, it pulls high to +9.4V through an LED and a 680 ohm resistor. Condition Position P3, pin7 connects to centre tap of transformer T1 1-2* P3, pin 7 connects to ALARM signal RF Technology T220 Page 9...

  • Page 10: Jp22: Use Tone- As A Direct Digital Input (Rev 4 Or Higher)

    VCO. The digital signal is input via the DB9 rear connector and the audio input signal is via the Line inputs on the standard DB25 rear panel connector. Condition Position N DMTX board 1-2, 5-6* DMTX board connected 2-3, 4-5 Page 10 RF Technology T220...

  • Page 11: Transmitter I/O Connections

    Figures 1 and 2 show the rear panel connectors, and Table 4 shows the signals that are brought out onto spade connectors for these daughter boards. The spade connectors (2.1 x 0.6 x 7mm) are captive/soldered at the labelled points. RF Technology T220 Page 11...
  • Page 12 BCD 8 BCD 10 Channel select 10’s digit BCD 10 BCD 20 Channel select 10’s digit BCD 20 BCD 40 Channel select 10’s digit BCD 40 BCD 80 Channel select 10’s digit BCD 80 Table 4 Page 12 RF Technology T220...

  • Page 13: Channel And Tone Frequency Programming

    Hz for sub-audible tones and digital squelch codes. A two point modulation scheme is used with the audio also being fed to the VCO to modulate the higher audio frequencies. RF Technology T220 Page 13...

  • Page 14: Power Amplifier

    DC loop PTT signaling or a 2/4 wire hybrid connection. All four leads are available at the rear panel system connector. The secondary of T1 can be terminated with an internal 600Ω load through JP5 or left un-terminated in high impedance applications. Page 14 RF Technology T220...

  • Page 15: Direct Coupled Audio Input

    The high and low pass filters, and the limiter can all be bypassed by choosing the non default position for jumper JP16, and. as well, removing the link from JP22. This connects the TONE - pin of P3 directly into the summing amplifier U7a. RF Technology T220 Page 15...

  • Page 16: Audio Signal Processing

    DC current loop control can be used for remote PTT operation. The current loop can be configured by JP9, JP10 and JP11 for use with either a remote free switch or a remote switched source. Page 16 RF Technology T220...

  • Page 17: Microprocessor Controller

    ALARM LED through Q1. Depending on the setting of Jumper JP19, the ALARM signal can be brought out on pin 7 of P3. RF Technology T220 Page 17...

  • Page 18: Voltage Regulator

    AF signal generator with 600Ω impedance, 150--3000Hz frequency range, with level set to 387mV RMS. • Power supply set to 13.8Vdc, with a current capability of >5A. • RF 50Ω load, 30W rated, return loss <-20dB. • Jumpers set to factory default positions. Page 18 RF Technology T220...

  • Page 19: Vco Alignment

    Measure deviation and adjust RV4 (line Level) for a deviation of 5kHz (2.5kHz for narrow band transmitters). Set the audio input to 1.5kHz, 0dBm. Adjust RV2 (Mod. Bal.) for a deviation of 5kHz (2.5kHz for narrow band transmitters). RF Technology T220 Page 19...

  • Page 20: Tone Deviation

    Set the audio to 1kHz, 0dBm, on the line input, or use the actual signal to be transmitted. Key the transmitter on. Adjust RV4 (line level) for 60% of system deviation (1.5kHz ) ___________________ The factory default is 500Hz for wide band (5kHz maximum deviation) and 250Hz for narrow band channels. Page 20 RF Technology T220...

  • Page 21: Output Power

    1.0dB cable and connector losses, and assume that the maximum rated power is 30W. This means no more than 24W at the end of a 1m length of test cable. This pessimistic procedure is safe on all models manufactured at the time of writing. RF Technology T220 Page 21...

  • Page 22: Channel Programming

    Channel Pr ogr amming The channel information is stored in non-volatile memory and can be programmed via the front panel test connector using a PC and RF Technology software. 7.1.4 Channel Selection Channel selection is by eight channel select lines. These are available through the rear panel connector.

  • Page 23: Test Points

    Step size is 5 or 6.25kHz, fixed 7.4.4 Fr equency Stability ±2.5 ppm over 0 to +60 C, standard ±1ppm over -20 to +60 C, optional 7.4.5 Number of Channels 100, numbered 00 - 99 RF Technology T220 Page 23...

  • Page 24: Antenna Impedance

    The residual modulation and noise in the range 300 - 3000 Hz is typically less than - 50dB referenced to rated system deviation. 7.4.14 600Ω Line Input Sensitivity Adjustable from -30 to +10 dBm for rated deviation Page 24 RF Technology T220...

  • Page 25: Hi-Z Input

    7.4.21 DC Remote Keying An opto-coupler input is provided to enable dc loop keying over balanced lines or local connections. The circuit can be connected to operate through the 600Ω line or through a separate isolated pair. RF Technology T220 Page 25...

  • Page 26: Programmable No-Tone Period

    Tone frequencies are given in table 4. Connector s 7.5.1 Antenna Connector Type N Female Mounted on the module rear panel ____________________________ The reverse phase burst is usually sufficient to eliminate squelch tail noise in higher-quality mobiles. Page 26 RF Technology T220...
  • Page 27 131.8 136.5 141.3 146.2 151.4 156.7 159.8 162.2 165.5 167.9 171.3 173.8 177.3 179.9 183.5 186.2 189.9 192.8 196.6 199.5 203.5 206.5 210.7 218.1 225.7 229.1 Table 4: Tone Squelch Frequencies 233.6 241.8 250.3 254.1 RF Technology T220 Page 27...

  • Page 28: Power And I/O Connector

    (exciter) PCB. Figure 3 shows the detailed circuit diagram with component numbers and values for the higher-power PA variation. Figure 4 shows the detailed circuit diagram with component numbers and values for the lower-power PA variation. Page 28 RF Technology T220...

  • Page 29: Component Overlay Diagrams

    PCB. Figure 6 shows the detailed circuit diagram with component numbers and values for the higher-power PA variation. Figure 7 shows the detailed circuit diagram with component numbers and values for the lower power PA variation. RF Technology T220 Page 29...

  • Page 30: B Parts List

    T220 PARTS LIST T220 Parts List Main PCB Assembly Parts Ref. Description Par t Number Capacitor 10U 35V Rad Electro 41/2001/010U Capacitor 18P 2% 100V NPO Rad.1 45/2680/018P Capacitor 100N 10% 50V X7R Rad.2 46/2001/100N Capacitor 10N 10% 50V X7R Rad.2...
  • Page 31 T220 PARTS LIST Ref. Description Par t Number Capacitor 100N 10% 50V X7R Rad.2 46/2001/100N Capacitor 100N 10% 50V X7R Rad.2 46/2001/100N Capacitor 10U 35V Rad Electro 41/2001/010U Capacitor 100N 10% 50V X7R Rad.2 46/2001/100N Capacitor 1N0 5% 100V NPO Rad.2 46/2000/01N0 Capacitor 100N 10% 50V X7R Rad.2...
  • Page 32 T220 PARTS LIST Ref. Description Par t Number Diode Silicon 1N4148 21/1010/4148 Diode Silicon 1N4148 21/1010/4148 Diode Silicon GP 21/1010/4002 Diode Zener 1N4751 30V 1W Axial 21/1040/4751 Diode Silicon GP 21/1010/4002 Diode Silicon GP 21/1010/4002 Diode Silicon 1N4148 21/1010/4148 Diode Silicon 1N4148...
  • Page 33 T220 PARTS LIST Ref. Description Par t Number Transistor GP NPN MMBT3904 SOT23 27/3020/3904 Transistor GP NPN MMBT3904 SOT23 27/3020/3904 Transistor GP PNP MMBT3906 SOT23 27/3020/3906 Transistor GP NPN MMBT3904 SOT23 27/3020/3904 Transistor MMBF5459 LT1 SOT23 27/3020/5459 Transistor GP NPN MPS2369 SOT23...
  • Page 34 T220 PARTS LIST Ref. Description Par t Number Resistor 100K 5% 0.25W Axial 51/1040/100K Resistor 6K8 5% 0.25W Axial 51/1040/06K8 Resistor 10K 5% 0.25W Axial 51/1040/010K Resistor 10K 5% 0.25W Axial 51/1040/010K Resistor 64K9 1% 0.25W Axial 51/1010/64K9 Resistor 64K9 1% 0.25W Axial 51/1010/64K9 Resistor 7K50 1% 0.25W Axial...
  • Page 35 T220 PARTS LIST Ref. Description Par t Number R106 Resistor 560R 5% 0.25W Axial 51/1040/0560 R107 Resistor 3K3 5% 0.25W Axial 51/1040/03K3 R108 Resistor 560R 5% 0.25W Axial 51/1040/0560 R109 Resistor 1K0 5% 0.25W Axial 51/1040/01K0 R110 Resistor 100R 5% 0.25W Axial...
  • Page 36 T220 PARTS LIST Power Amplifier Assembly Ref. Description Par t Number Capacitor 1N0 5% 63V NPO SM1206 46/3300/01N0 Capacitor 1N0 5% 63V NPO SM1206 46/3300/01N0 Capacitor 18P 5% NPO SM1206 46/3300/018P Capacitor 1N0 5% 100V NPO Rad.2 46/2000/01N0 Capacitor 10N 10% 50V X7R Rad.2 46/2001/010N Capacitor 1N0 5% 100V NPO Rad.2...
  • Page 37 T220 PARTS LIST Ref. Description Par t Number Resistor 10K 5% 0.25W Axial 51/1040/010K Resistor 470R 5% 0.25W Axial 51/1040/0470 Resistor 470R 5% 0.25W SM1206 51/3380/0470 Resistor 7K5 1% 0.25W Axial 51/1010/07K5 Resistor 1K0 5% 0.25W Axial 51/1040/01K0 Resistor 100K 5% 0.25W Axial 51/1040/100K Resistor 100R 5% 0.25W Axial...
  • Page 38 Rev No. ECO No. Description of Change Title 9117 - 25W 220MHz PA T&B 609-1627 Size: Number: Revision: RF Technology Pty Ltd Print Date: 29-Oct-2003 15:02:41 Sheet Unit 10, 8 Leighton Place Hornsby, NSW 2077 Rev. Release Date: Originator: Australia File: I:\CAD_File\Protel99\220MHz\220MHz.ddb - 9117-220-2.sch...
  • Page 39 4066 Title: 220MHZ EXCITER 05/9166 R7 Revision: Size: Number: RF Technology Pty Ltd Unit 10, 8 Leighton Place Print Date: 31-Oct-2003 12:50:50 Sheet Hornsby, NSW 2077 NB: The 220MHz exciter sub-assembly 16/9103/220N uses the UHF exciter PC board 30/9103 rev 9 or higher...

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