Related Manuals for HYT RPU416A
Summary of Contents for HYT RPU416A
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Page 1: Table Of Contents
CONTENTS General Mode Combination RPU416A Circuit Description RPU416A Software Description RPU416A Parts List RPU416A Adjust Description Disassembly for Repair Exploded View Packing RPU416A PC Board View RPU416A Block Diagram RPU416A Level Diagram RPU416A Schematic Diagram Main Technical Specifications... -
Page 2: General
General This manual is intended for use by experienced technicians familiar with similar types of commercial grade communications equipment. It contains main required service information and data for the equipment. The following precautions are recommended for personal safety: DO NOT transmit until all RF connectors are verified secure and any open connectors are properly terminated. -
Page 3: Mode Combination
The receiver utilizes double conversion. The first IF is 38.85MHz and the second IF is 450kHz. The first local oscillator signal is supplied from the PLL circuit. The PLL circuit in the transmitter generates the necessary frequencies. Fig.1 shows the frequencies. RPU416A frequency range: 450MHz—470MHz... - Page 4 450KHz ANTSW SYSTEM 38.85MHz multiply TCXO 12.8MHz Fig.1 Frequency configuration 2. Receiver The receiver is double conversion superheterodyne. 1) Front-end RF amplifier An incoming signal from the antenna is applied to a Preamplifier (Q203) after passing through a transmit/receive switch circuit (K102 and D103 are off) and a 3-pole LC filter. After the signal is amplified (Q203), the signal is filtered by a band pass filter (a3-pole LC filter) to eliminate unwanted signals before it is passed to the first mixer.
- Page 5 RPU416A Circuit Description signal. The second IF signal is then fed through a 450kHz ceramic filter (CF200) to further eliminate unwanted signals before it is amplified and FM detected in IC200. 4) AF amplifier The recovered AF signal obtained from IC200 is amplified by IC300 (1/4), filtered by the IC300 low-pass filter (2/4) and IC300 high-pass filter (3/4) and (4/4), and de-emphasized by R303 and C306.
- Page 6 PLL IC IC1 D2.4 TX VCO 5KHz/6.25KHz RF AMP BUFF AMP PLL DATA PHASE CHARGE PUMP COMPARATOR D1.3 RX VCO REF OSC 5KHz/6.25KHz Q5.7 T/R SW 12.8MHz Fig. 4. PLL circuit 2) VCO The operating frequency is generated by Q4 in transmit mode and Q3 in receive mode. The oscillator frequency is controlled by applying the VCO control voltage, obtained from the phase comparator, to the varactor diodes (D2 and D4 in transmit mode and D1 and D3 in receive mode) .
- Page 7 RPU416A Circuit Description The resulting signal goes to the VCO through the VCO modulation terminal for direct FM modulation. (See Fig. 6) 2) QT/DQT encoder A necessary signal for QT/DQT encoding is generated by IC403 and FM-modulated to the PLL reference signal.
- Page 8 RPU416A Circuit Description switching circuit before it is passed to the antenna terminal. The transmit/receive switching circuit is comprised of D101, D102 and D103. D102 and D103 turned on (conductive ) in transmit mode and off (isolated) in receive mode.
- Page 9 RPU416A Software Specifications .Specifications: 1. Use mechanical knob to choose from 16 channels. Frequency range: UHF: 450~470MHz 2. Monitor 3. Auto power saving 4. Audio alarm 5. Auto squelch control (0~9 level) 6. Timing 7. Channel space 25kHz/12.5kHz(Wide/Narrow) 8. CTCSS & DQT encode 9.
- Page 10 (3) Press [MONI],then press [PTT], to set the channel, channel data and initial data. (4) Turn off the power, disconnect SELF on PCB to end mode settings. (5) Remarks: The old data(frequency, CTCSS/DQT, channel function) will be deleted once set the new mode by pressing MONI AND PTT , part of the function also would be changed.
- Page 11 RPU416A Software Specifications (6) TC- 368(2) channel frequency diagram (after setting): 2CH(Central) 3CH(L) 4CH(H) Initial Model Frequency(MHz) IF(MHz) (MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) 136.000~149.995 140.000 +38.85 143.100 143.100 143.000 143.100 136.000 136.100 149.975 149.900 150.000~173.995 150.000 +38.85...
- Page 12 RPU416A Software Specifications 6. Manual Adjust Mode: Press PTT and MONI simultaneously to turn on the power"enter manual Adjust mode out 3 seconds later. Choose the settings by turning the channel selector knob 1-12CH, use PTT (upward) or MONI (downward) to adjust (Notice: MIC shouldn’t be connected with external cable...
- Page 13 XOUT Oscillator Grounding SHIFT Clock frequency deviation H: unlock PABC MOS FET power H: unlock WNRC Audio referential sensitivity L: narrow WNTC Max deviation H: narrow EEPROM data cable EEPROM clock cable Lock circuit detector L: unlock Common data output Common clock output PLL IC H: lock up...
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Page 14: Rpu416A Adjust Description
2.Adjustment: The adjustment of RPU416A, some are conducted in normal mode, some are in manual program mode. Turn on the power and enter the normal mode., at the same time, press the PTT and MONI to turn on the transceiver"enter the manual program mode 3seconds later.(refer to”RPU416A... - Page 15 RPU416A Adjust Description Adjust the receiver section: (enter manual mode) Measurement Adjustment Specifications Item Condition /Remarks Test equip Terminal parts Method Adjust the undee to the top, 1:CH:RX center the bandwidth is about TC202 turn to channel 4 in 10MHz, the sign of central...
- Page 16 RPU416A Adjust Description Adjust the transmitter section: Measurement Adjustment Specifications Item Condition /Remarks Test equip Terminal Parts Method CH: TX center 8.Transmit Synthetical PTT(up)M Turn to channel 1 in Adjust it to center frequency Error<150Hz frequency test ONI(down) manual mode 1.CH:TX center...
- Page 17 RPU416A Adjust Description 2.CH: TX center, turn to channel 10 Adjust it to:0.35kHz±50Hz Narrow in manual mode 1.CH: TX center, Synthetical PTT"up"M test Adjust it to:0.75kHz±50Hz Wide turn to channel 11 ONI"down " LPF:300H in manual mode 14.DQT DEV 2.CH:TX center, Adjust it to:0.35kHz±50Hz...
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Page 18: Disassembly For Repair
Disassembly for Repair Separating the case assembly from the chassis 1. Remove the two knobs # and three round nuts $. 2. Remove the two screws %. 3. Expand the right and left sides of the bottom of the case assembly"lift the chassis, and remove it from the case assembly. -
Page 19: Exploded View
Exploded View Packing... -
Page 21: Rpu416A Level Diagram
RPU416A Level Diagram Rx Section SG output level for obtaining 12Db/SINAD when injected to each point Modulate the AF level with a frequency of 1kHz and deviation of 1.5kHz -116.5dBm -113dBm -98dBm -103dBm -104dBm -106.5dBm -103dBm 1018mVrms 175mVrms 23.5mVrms 0.63Vrms... -
Page 22: Main Technical Specifications
Main Technical Specifications Frequency range 450 MHz ~470 MHz Channel Channel space 25kHz / 12.5kHz Antenna impedance Transmitter 2K& impedance Input voltage 7.2V DC Frequency stability ±2.5×10 Transmitter Frequency stability ±2.5×10 Output power 4.0±0.5W Operating sensitivity 12±3mV Audio distortion Modulation limiting 5kHz / 2.5kHz Bandwidth 16 kHz/8kHz...
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