CONTENTS General 2 Mode Combination 3 RPU416A Circuit Description 4 RPU416A Software Description 10 RPU416A Parts List 16 RPU416A Adjust Description 26 30 Disassembly for Repair Exploded View Packing 31 32 RPU416A PC Board View 33 RPU416A Block Diagram 37 RPU416A Level Diagram 39 RPU416A Schematic Diagram 41 Main Technical Specifications 49 1
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. ! SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an explosive atmosphere.
Mode Combination 1. Mode User mode: Turn on the power to enter. PC mode"Set and adjust with PC software or programmer. 2. Parts description: (1) Antenna (2) Channel (frequency) selector knob Turn the knob to choose channel from 1~16(channel 16 may be set by distributor as scan channel). (3) LED light Lights red while transmitting, green while receiving a signal. Flashes red when the battery voltage is low while transmitting.
CF 450KHz ANT MCF ANTSW C IF SYSTEM RF AMP AF AMP SP C 38.85MHz X3 multiply TCXO 12.8MHz B B RX PA AMP TX AMP PLL VCO MIC AMP MIC TX 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.
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. The AF signal is then passed through a WIDE/NARROW switch (Q303).
D D PLL IC IC1 D2.4 I/N Q4 TX VCO Q2 RF AMP 5KHz/6.25KHz Q6 BUFF AMP LPF PLL DATA PHASE COMPARATOR C CHARGE PUMP D1.3 REF OSC Q3 RX VCO C I/M Q5.7 T/R SW 5KHz/6.25KHz B B 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) .
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. Since the reference OSC does not modulate the loop characteristic frequency or higher, modulation is performed at the VCO side by adjusting the balance. (See Fig. 6) IC500(1/2) MIC AMP IC500(1/2) IDC PREEMPHASIS Q501.
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. 5) APC The automatic power control (APC) circuit stabilizes the transmitter output power at a predetermined level by sensing the drain current of the final amplifier Field Effect Transistor (FET).
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. CTCSS & DQT decode 10.Two Tone Signal decode 11.Two Tone Signal encode 12.Busy channel lock 13.Clock frequency deviation 14.Scan 15.PC mode 16.PC modifying mode 17.Wire clone 18.Manual modifying mode .Description: 1.
(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. Therefore, do not set this operation unless change the EEPROM, etc.
RPU416A Software Specifications (6) TC- 368(2) channel frequency diagram (after setting): Frequency(MHz) Initial (MHz) IF(MHz) 1 136.000~149.995 140.000 2 150.000~173.995 3 No Model 1CH 2CH(Central) 3CH(L) 4CH(H) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) +38.85 143.100 143.100 143.000 143.100 136.000 136.100 149.975 149.900 150.000 +38.85 162.100 162.100 162.000 162.100 150.000 150.100 173.975 173.900 400.000~419.995 410.000 -38.85 410.
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.
23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 XOUT VSS SHIFT PABC WNRC WNTC NC SDA SCL UL DT CK LE 5MC AFCO RX GLED RLED SAVE MUTE 5RC 5TC NC NC NC NC NC NC NC NC NC NC VCCN APC VCC VREF AVSS NC NC NC NC TIBI O I O O O O I I/O O I O O O O O O O O O O O O I I I I I I I I I I O O I I I I I I I I Oscillator Grounding Clock frequency deviation H: unlock MOS FET power H: unlock Audio referential sensitivity L: narrow Max deviation
RPU416A Adjust Description Use programmer or PC software to program RPU416A, or by manual program, refer to”RPU416A software description ” for the manual program and mode settings. . Instrument: 1. 2. 3. 4. 5. Synthesized test instrument 1 set Scanner 1 set 3A/10V power 1 set Digital Voltmeter 1 set 3A DC Ammeter 1 set . Adjust: 1. Initialization It is necessary to initialize the transceiver because there is useless data in EEPROM.
RPU416A Adjust Description Adjust the receiver section: (enter manual mode) Item Condition Measurement Test equip Terminal 1:CH:RX center turn to channel 4 in manual mode 4.Band- 2. CH: RX LOW Spectrum pass turn to channel 5 in analyzer filter manual mode ANT .
RPU416A Adjust Description Adjust the transmitter section: Item Condition Measurement Test equip CH: TX center 8.Transmit Turn to channel 1 in Synthetical frequency test manual mode Terminal Parts Method Specifications /Remarks ANT PTT(up)M ONI(down) Adjust it to center frequency Error<150Hz PTT(up)M ONI(down) Adjust it to: 3.7
RPU416A Adjust Description 2.CH: TX center, turn to channel 10 in manual mode 1.CH: TX center, Synthetical test turn to channel 11 LPF:300H in manual mode ANT PTT"up"M ONI"down " Adjust it to:0.35kHz±50Hz Narrow Adjust it to:0.75kHz±50Hz Wide Adjust it to:0.35kHz±50Hz Narrow 14.DQT DEV 2.CH:TX center, turn to channel 12 in manual mode Turn to channel 3 15.Low in manual mode, Battery level Adjust the battery to 5.
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. 4. Taking care not to cut the speaker lead, open the chassis and case assembly.
Exploded View Packing 19
RPU416A Level Diagram Rx Section SG output level for obtaining 12Db/SINAD when injected to each point -116.5dBm -113dBm -98dBm Modulate the AF level with a frequency of 1kHz and deviation of 1.5kHz -103dBm -104dBm -106.5dBm -103dBm 1018mVrms 175mVrms 23.5mVrms 0.63Vrms 5R ANT L112 L208 IC200 R224 Q203 IC300 R211 Q202 R217 C145 IC302 Q201 SP Q307 XF200 C212 L203, L214 VR R210 1st Local 0.1Vrms RF center through a 470pF coupling capacitor. st Measure the 1 Local level on a RF VTVM.
Main Technical Specifications Frequency range 450 MHz ~470 MHz Channel 16 Channel space 25kHz / 12.5kHz Antenna impedance 50 Transmitter impedance 2K& Input voltage 7.2V DC Frequency stability ±2.5×10 -6 Transmitter Frequency stability ±2.5×10 -6 Output power 4.0±0.5W Operating sensitivity 12±3mV Audio distortion 5% Modulation limiting 5kHz / 2.5kHz Bandwidth 16 kHz/8kHz Modulate specialty '3dB Spurious RF 7.
