RELM RPV516 User manual

Contents
General………………………………………………………………………………1
Brief Introduction…………………………………………………………………….2
Circuit Description…………………………………………………………………..3
Software Specifications……………………………………………………………..9
Adjustment Description……………………………………………………………14
Disassembly for Repair……………………………………………………………18
Exploded View……………………………………………………………………..19
RPV516 Parts List…………………………………………………………………20
RPU416 Parts List…………………………………………………………………26
Parts List 2…………………………………………………………………………33
Packing……………………………………………………………………………..34
RPV516 Level Diagram…………………………………………………………...35
RPU416 Level Diagram………………………………………………………...…36
RPV516 PC Board View………………………………………………………….37
RPU416 PC Board View………………………………………………………….39
RPV516 Block Diagram…………………………………………………………...41
RPU416 Block Diagram…………………………………………………………..42
RPV516 Schematic Diagram……………………………………………………..43
RPU416 Schematic Diagram……………………………………………………..44
Specifications………………………………………………………………………45

RPV516/RPU416 General
- 1 -
General
Manual Scope
This manual is intended for use by experienced technicians familiar with similar types of communication
equipment. It contains all service information required for the equipment described and is current as of
the printing data.
User Safety Information
The following precautions are recommended for personnel safety:
zDO NOT transmit until all RF connectors are verified secure and any open connectors are properly
terminated.
zSHUT OFF and do not operate this equipment near electrical blasting caps or in an explosive
atmosphere.
zWhen in vehicles with an airbag, do not place a portable radio in the area over an airbag or in the
airbag deployment area.
zDo not expose the radio to direct sunlight for a long time nor place it close to a heating source.
zDo not use any portable radio with a damaged antenna. If a damaged antenna comes into contact
with your skin, a minor burn may result.
zWhen transmitting with a portable radio, hold the radio in a vertical position with its microphone
about 5 centimeters away from your mouth.
zIf you wear a portable radio on your body, be sure to keep the antenna at least 2.5 centimeters away
from your head or body when transmitting.
zThis equipment should be serviced by a qualified technician only.

RPV516/RPU416 Brief Introduction
- 2 -
Brief Introduction
1. Mode
User mode: Turn on the power to enter the mode.
PC mode：Set and adjust radio data with PC software or programmer in this mode.
2. Parts description:
(1) Antenna
(2) Channel (frequency) selector knob
Turn the knob to choose channel from 1 to16 (Channel 16 can be set by the dealer as scan
function).
(3) LED indicator
Red LED glows while transmitting; green LED glows while receiving; red LED flashes when the
battery voltage is lower than the preset while transmitting.
(4) Power /Volume control knob
Turn the knob clockwise to turn on the power; turn the knob counter clockwise to turn off the power.
After the power is turned on, turn the knob to adjust the volume level.
(5) Speaker
(6) Microphone
(7) PTT (push to talk)
To transmit, hold down PTT and speak into the microphone; to receive, release PTT.
(8) Monitor key
Press the key to open squelch; release to close squelch.
(9) Speaker/microphone jack
(10) Belt clip
(11) Battery

RPV516/RPU416 Circuit Description
- 3 -
Circuit Description
1. Frequency configuration
The receiver utilizes double conversion superheterodyne. The first IF is 38.85MHz and the second IF
is 450KHz. The first local oscillator signal is supplied by PLL circuit.
The PLL circuit in the transmitter generates the necessary frequencies. Fig.1 shows the frequencies.
RPV516 frequency range: RPV516 A: 150MHz—174MHz
RPU416 frequency range: RPU416 B: 400MHz—420MHz
RPU416 A: 450MHz—470MHz
B
CC
B
ANT
ANTSW RF
MCF
38.85MHz
CF
450KHz
SYSTEM AF SP
X3
multiply
IF
TCXO 12.8MHz
MIC
AMP
MICPLL
VCO
RX
TX
TX
AMP
PA
AMP
AMP AMP
Fig. 1. Frequency configuration
2. Receiver
The receiver employs double conversion superheterodyne.
1-a) Front end RF amplifier (RPV516)
The input signal of antenna is applied to an RF amplifier (Q203) after passing through a
transmit/receive switch circuit and a 3-grade low pass filter. The amplified signal is filtered through a
band pass filter (a 3-grade LC filter) to eliminate unwanted signal before it is applied to the first mixer.
The voltage of varactor is provided by MPU (IC403). (See Fig. 2-a)
B
CC
B
ANT
D102
D103 BPF Q203
RF AMP
L208-L210 BPF L214L215 MCF XF200 IF AMP Q201
MIXER
Q202
CF200
IF.MIX
IC200
AF AMP
LPF.HPF
IC300
AF PA AMP
IC302
SP
WIDE/NARROW SW
Q303
X3
multiply
Q1
TCXO
1st Local OSC
(PLL)
TUNE
APC
IC403
MCU
Fig. 2-a. Receiver section configuration

RPV516/RPU416 Circuit Description
- 4 -
1-b) Front end RF amplifier (RPU416)
The input signal of antenna is applied to an RF amplifier (Q203) after passing through a
transmit/receive switch circuit and a 3-grade low pass filter. The amplified signal is filtered through a
band pass filter (a 3-grade LC filter) to eliminate unwanted signal before it is applied to the first mixer.
The voltage of varactor is provided by MPU (IC403). (See Fig. 2-b)
B
CC
B
ANT
D102
D103 Q203
RF AMPBPF
L208-L211 MCF XF201 IF AMP Q201
MIXER
Q202
CF200
IF.MIX
IC200 AF AMP
LPF.HPF
IC300
AF PA AMP
IC302
SP
WIDE/NARROW SW
Q303
multiplyTCXO
1st Local OSC
(PLL)
BPF
L214-L215
MCU
X3
Q1
IC403
APC
TUNE
Fig. 2-b. Receiver section configuration
2) First mixer
The signal from the RF amplifier is heterodyned with the first local oscillator signal from the PLL
frequency synthesizer circuit at the first mixer (Q202) to create a 38.85 MHz first IF (intermediate
frequency) signal. The first IF signal is then applied to two monolithic crystal filters (MCFS: XF200) to
further remove spurious signal.
3) IF amplifier
The first IF signal is amplified by Q201, and then enters IC200 (IF processing IC). The signal is
heterodyned again with a second local oscillator signal within IC200 to create a 450KHz second IF
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 (4/4), and de-emphasized by R303 and C306. The
processed AF signal is then passed to a WIDE/NARROW switch (Q303) and its output is applied to
an AF volume control and is amplified to a sufficient level to drive a loud speaker by an AF power
amplifier (IC302).

RPV516/RPU416 Circuit Description
- 5 -
5) Squelch
Part of the AF signal from IC200 re-enters IC200, and the noise component is amplified and rectified
by a filter and an amplifier to produce a DC voltage corresponding to the noise level.
The DC signal is injected to the analog port of the microprocessor (IC403). IC403 compares the
voltage with the preset value and determines whether to output sounds from the speaker. IC403
sends a high level signal to the MUTE and AFCO lines and turns IC302 on through Q302, Q304,
Q305, Q306 and Q307. (See Fig.3)
FM IF IC200
IF AMP DET
DET HPF
AMP
IC 300
AF AMP LPF HPF Q302 SW IC302 AF/PF AMP Q307 SW
SP
Q304.Q305.Q306
SW
Q15
W/N SW
IC301
LPF
562676
BUSY MUTE AFCO TI
IC403
MPU
Fig. 3. AF amplifier and squelch
6) Receiving signaling
CTCSS/CDCSS
IC200 output signal is filtered by 300Hz low-pass filter (IC301) and the filtered signal is input to the
microprocessor (IC403). IC403 determines whether the CTCSS or CDCSS matches the preset value,
and controls the MUTE and AFCO and the speaker sounds output according to the squelch results.
TTS
IC200 output signal is filtered by IC8 and then applied to the microprocessor (IC403). IC403 compares
TTS with the preset value and controls MUTE and AFCO and speaker output according to squelch
results.
3. PLL frequency synthesizer
PLL circuit generates the first local oscillator signal for reception and the RF signal for transmission.
1) PLL
The frequency step of the PLL circuit is 2.5 or 6.25KHz. A 12.8MHz reference oscillator signal is
divided at IC1 by a mixed counter to produce 2.5 or 6.25KHz reference frequency. The voltage
controlled oscillator (VCO) output signal is buffer amplified by Q6, and then divided in IC1 by a
dual-module programmable counter. The divided signal is compared in phase with the 2.5 or 6.25KHz
reference signal in the phase comparator in IC1. The output signal from the phase comparator is
filtered through a low-pass filter and passed to the VCO to control the oscillator frequency. (See Fig. 4
of Next Page)

RPV516/RPU416 Circuit Description
- 6 -
B
C
DD
C
B
PLL DATA
PLL IC IC1
I/N 5KHz/6.25KHz
PHASE
COMPARATOR
REF OSC
12.8MHz
I/M 5KHz/6.25KHz
CHARGE
LPF
D2.4 Q4 TX VCO
D1.3 Q3 RX VCO
Q6
BUFF AMP
Q5.7
T/R SW
Q2
RF AMP
PUMP
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). The T/R pin is set
high in receive mode causing Q5 and Q7 to turn Q4 off, and turn Q3 on. The T/R pin is set low in
transmit mode. The outputs from Q3 and Q4 are amplified by Q6 and sent to the buffer amplifiers.
3) Unlock Detector
If a low level signal appears at the LD pin of IC1, an unlock condition occurs, and the DC voltage
obtained from D7, R6, and C1 causes the voltage applied to the UL pin of the microprocessor to go
low. When the microprocessor detects this condition, the transmitter is disabled, ignoring the
push-to-talk switch input signal. (See Fig. 5)
IC1
LD
PLL IC
D7
5C
R6
C1
IC403
UL
MPU
Fig. 5. Unlock detector circuit
4. Transmitter
1) Transmit audio
The modulation signal from the microphone is amplified by IC500 (1/2), and then passes through a
pre-emphasis circuit and a 300Hz low-pass filter (Q501 and Q502). The resulting signal goes to the
VCO for direct FM modulation. (See Fig. 6)
2) CTCSS/CDCSS encoder
A necessary signal for CTCSS/CDCSS 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)

RPV516/RPU416 Circuit Description
- 7 -
3) TTS encoder
The necessary signal for TTS encoding is generated by IC403. The signal is sent to IC500 (1/2), and
then applied to 3KHz low-pass filter (Q501 and Q502). The resulting signal is applied to VCO for direct
modulation (See fig. 6).
VCO
D5.Q4
VR500
BALANCE
VR501
MAX
DEV
X1.IC1
PEFERENCE
OSC
CTCSS/CDCSS
TO
TTS
TTS
MUTE
Q503
SW
MIC
IC500(1/2)
MIC
AMP PREEMPHASIS IC500(1/2)
IDC
Q501.502
LPF
(SPATTER FILTER)
IC403
Fig. 6. Transmit audio CTCSS/CDCSS
4-a) RF amplifier (RPV516)
The RF signal obtained from the VCO buffer amplifier Q100 is amplified by Q101 and Q102. This
amplified signal is passed to the power amplifier, Q102 and Q105, which consists of a 2-stage FET
amplifier and is capable of producing up to 4.5W of RF power (See Fig. 7-a).
Fig. 7-a. APC system
4-b) RF amplifier (RPU416)
The RF signal obtained from the VCO buffer amplifier Q100 is amplified by Q101 and Q102. This
amplified signal is passed to the power amplifier, Q105 and Q107, which consists of a 2-stage FET
amplifier and is capable of producing up to 4W of RF power (See Fig. 7-b)
D
C
B
A
Title
Number RevisionSize
AMP
Q101
5T
DRIVE AMP
Q102
FINAL AMP
Q105
ANT SW
D101 LPF
ANT
ANT SW
D102.103
RX
Q106
SW
Q109
SW
5T
IC100
APC
DET
Q103.Q104
B SW
B
APC
5T
TH100
SW
Q107
5T
Q108
SW

RPV516/RPU416 Circuit Description
- 8 -
D
C
B
A
Title
Number RevisionSize
AMP
Q101.102
5T
DRIVE AMP
Q105
FINAL AMP
Q107
ANT SW
D101 LPF
ANT
ANT SW
D102.103
RX
Q106
SW
Q109
SW
5T
IC100
APC
DET
Q103.Q104
B SW
B
APC
5T
TH102
SW
Q110
5T
Q108
SW
Fig. 7-b. APC system
5) ANT switch and LPF
The RF amplifier output signal is passed through a low-pass filter network to filter the second
harmonic components and then applied to a transmit/receive 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 is turned on (conductive) in transmit mode and off (isolated) in receive mode.
6) 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). The voltage
comparison circuit compares the voltage obtained from the above drain current with a reference
voltage which is set using the microprocessor. The APC voltage is proportional to the difference
between the sensed voltage and the reference voltage output from IC100 (1/2). This output voltage
controls the gate of the FET power amplifier, which keeps the transmitter output power be varied by
the microprocessor which in turn changes the reference voltage and hence, the output power.
7) Temperature protection circuit
When the thermistor (TH102) reaches about 80℃, the protection circuit turns on Q110 to protect
transmitting final amplifier (Q107).
5. Power supply
A 5V reference power supply [5M] for the control circuit is derived from an internal battery. This
reference power supply is used to provide a 5V supply in transmit mode [5T], a 5V supply in receive
mode [5R], and a 5V supply common in both modes [5C] based on the control signal sent from the
microprocessor.
6. Control system
The IC403 CPU operates at 7.37MHz. This oscillator has a circuit that shifts the frequency according
to the EEPROM data.

RPV516/RPU416 Software Specifications
- 9 -
Software Specifications
Ⅰ．Specifications:
1. Use mechanical knob to choose from 16 channels.
Frequency: VHF: 150~174MHz UHF: 400~420MHz UHF: 450~470MHz
2. Monitor
3. Auto power saving
4. Audio alarm
5. Auto squelch control (1~9 level)
6. Timing
7. Channel spacing 25KHz/12.5KHz (Wide/Narrow)
8. CTCSS, CDCSS and TTS encode
9. CTCSS, CDCSS and TTS decode
10. Busy channel lockout
11. Clock frequency offset
12. Scan
13. PC mode
14. PC adjusting mode
15. Wired clone
16. Manual adjusting mode
Ⅱ．Description:
1. User mode: conventional communications mode
2. PC mode:
The following parameters can be set by using external programmer or PC programming
software:
(1) Receive frequency & Transmit frequency
(2) Receive signaling & Transmit signaling
(3) Busy channel lockout
(4) Clock frequency offset
(5) TOT
(6) Squelch level
(7) Power saving
(8) Audio alarm
(9) Channel spacing 25KHz/12.5KHz(Wide/Narrow)
(10) Monitor mode
(11) Scan mode
(12) Scan revert channel
(13) Priority scan channel
3. PC adjusting mode:
The following parameters can be set by using external programmer or PC programming
software:
(1) Transmit power output
(2) Low battery warning level
(3) Squelch level (level 9 and level 3)
(4) CTCSS deviation (Wide/Narrow).
(5) CDCSS deviation (Wide/Narrow).
(6) Receive sensitivity(at low、center、high frequency)

PV516/RPU416 Software Specifications
- 10 -
4. Wired Clone:
Turning on the power while holding down MONI, the radio enters wired clone mode after 2 seconds.
Press PTT, red LED blinks, and cloning begins; when cloning is completed, red LED goes out.
5. Model set mode:
(1) Complete the two SELF points (short circuit) on PCB, and turn on the power, two “Beeps” are
sounded.
(2) Set channel selector knob to corresponding position (1-16) according to the model (see initial
data table)
(3) Press [PTT] while holding down [MONI] to set the model. Channel data and settings are
initialized.
(4) Turn off the power, and disconnect the two SELF points on PCB to end the model settings. E.g.
RPV516A, its No. is 2, to initialize its model and channel data: short out the two SELF points
on PCB , and turn on the power, set the channel selector knob at CH2, and then press PTT
while holding down MONI, channel data of CH1,CH2,CH3 and CH4 is initialized as the
corresponding data of No.2. The receive and transmit frequencies of channel 5-14 are same
as channel 1, and the tone of CH5 and CH10 is 67.0Hz; CH6 and CH11 is 151.4Hz; CH7 and
CH12 is 250.3Hz; the code of CH8 and CH13 is 423(CDCSS); CH9 and CH14 is
-423(CDCSS). Channel 1-9 are wide, Channel 10-14 are Narrow. Turn off the power after
reset, disconnecting the two SELF points and restart the power to use the radio.
(5) Remarks:
The old data (frequency, CTCSS/CDCSS, channel function settings) will be deleted once the
new model is set, and part of functions will also be changed. Therefore, do not make this
operation unless it’s very necessary, such as changing the EEPROM, etc.

- 11 -
(6) Initial data table:
1CH 2CH(center) 3CH(low) 4CH(high)
No. model Frequency (MHz) Initial
frequency
(MHz) IF (MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz)
1 136.000~149.995 140.000 +38.85 143.100 143.100 143.000 143.100 136.000 136.100 149.975 149.900
2 RPV516A 150.000~173.995 150.000 +38.85 162.100 162.100 162.000 162.100 150.000 150.100 173.975 173.900
3 RPU416B 400.000~419.995 410.000 -38.85 410.100 410.100 410.000 410.100 400.000 400.100 419.975 419.900
4 RPU416A 450.000~469.995 450.000 -38.85 460.100 460.100 460.000 460.100 450.000 450.100 469.975 469.900
5 350.000~369.995 360.000 -38.85 360.100 360.100 360.000 360.100 350.000 350.100 369.975 369.900
6 370.000~389.995 380.000 -38.85 380.100 380.100 380.000 380.100 370.000 370.100 389.975 389.900
7 220.000~239.995 230.000 -38.85 230.100 230.100 230.000 230.100 220.000 220.100 239.975 239.900
8 240.000~259.995 250.000 -38.85 250.100 250.100 250.000 250.100 240.000 240.100 259.975 259.900
9 406.000~429.995 410.000 -38.85 418.100 418.100 418.000 418.100 406.000 406.100 429.975 429.900
144.000~147.995 145.000 +38.85 146.100 146.100 146.000 146.100 144.000 144.100 147.975 147.900
11 336.000~367.995 350.000 -38.85 352.100 352.100 352.000 352.100 336.000 336.100 367.975 367.900
12 268.000~395.995 380.000 -38.85 382.100 382.100 382.000 382.100 268.000 268.100 395.975 395.900
13 430.000~439.995 430.000 -38.85 435.100 435.100 435.000 435.100 430.000 430.100 439.975 439.900
14 438.000~449.995 440.000 -38.85 444.100 444.100 444.000 444.100 438.000 438.100 449.975 449.900
15 465.000~494.995 480.000 -38.85 480.100 480.100 480.000 480.100 465.000 465.100 494.975 494.900
16 490.000~519.995 500.000 -38.85 505.100 505.100 505.000 505.100 490.000 490.100 519.975 519.900
Initialization data of channel 1-4 is in the above table CH1-CH4, the adjusting settings are reset to initial data. Tx and Rx frequencies of CH5~CH14 are the
same with CH1. The tone of CH5 and CH10 is 67.0Hz; the tone of CH6 and CH11 is 151.4Hz; the tone of CH7 and CH12 is 250.3Hz; the code of CH8 and
CH13 is 423(CDCSS); the code of CH9 and CH14 is -423(CDCSS). CH1~CH9 are Wide, CH10~CH14 are Narrow.

RPV516/RPU416 Software Specifications
- 11 -
- 12 -
6. Manual Adjust Mode:
Turn on the power while pressing PTT and MONI simultaneously，the radio enters manual adjust
mode after 3 seconds. Choose the settings by turning the channel selector knob to CH1-CH12
position; use PTT (upwards) or MONI (downwards) to adjust (Note: MIC jack shouldn’t be
connected with external cable while adjusting), CH1-CH12 positions are defined as follows:
(1) TTS deviation
(2) Transmit power output
(3) Low battery warning level
(4) Receive sensitivity (adjust at center frequency)
(5) Receive sensitivity (adjust at low frequency)
(6) Receive sensitivity (adjust at high frequency)
(7) Squelch level (level 9)
(8) Squelch level (level 3)
(9) CTCSS deviation (Wide)
(10) CTCSS deviation (Narrow)
(11) CDCSS deviation (Wide)
(12) CDCSS deviation (Narrow)
CH13-CH16 are used for adjusting transmitter and receiver. Press PTT to transmit; Press
MONI to choose wide or narrow, one Beep means Narrow, two Beeps mean Wide. CH13~
CH 16 are defined as follows:
(13) Center frequency (difference between transmit and receive frequency is 0.1MHz).
(14) Lowest frequency (difference between transmit and receive frequency is 0.1MHz).
(15) Highest frequency (difference between transmit and receive frequency is -0.075MHz).
(16) Center frequency: transmit with 250.3Hz CTCSS tone (difference between transmit and
receive frequency is 0.1MHz).
Note:
To enable or disable manual adjust mode: short out the two SELF points, turn on the power, and the
manual adjust mode is enabled; press [PTT], manual adjust mode is disabled. This mode is
suggested to be disabled after the adjustment is completed.
III. CPU:
CPU control M38034M4
Pin No. Port name I/O Function
1 TI I CTCSS/CDCSS input
2 BUSY I Input busy signal
3 BATT I Detect battery voltage
4 NC I NC
5 TO O Output CTCSS/CDCSS
6 BEEP O Beep output
7 2TN I TTS input
8 ENC0 I Input encode
9 ENC1 I Input encode
10 ENC2 I Input encode
11 ENC3 I Input encode
12 NC I NC
13 PTT I [PTT] input, connect with RXD
14 TXD O RS-232C output
15 RXD I RS-232C input
16 MONI I [MONI] input
17 SELF I Self-Program L: set up model
18 CNVSS I Connect VSS
19 RST I Reset input

RPV516/RPU416 Software Specifications
- 13 -
20 INT0 I Power detection
21 NC I NC
22 XIN I Oscillator (7.3728MHz)
23 XOUT O Oscillator
24 VSS I Grounding
25 SHIFT O Clock frequency shift H: unlock
26 PABC O MOSFETpower H:unlock
27 WNRC O Audio reference sensitivity L: narrow
28 WNTC O Max deviation control H: narrow
29 NC I NC
30 SDA I/O EEPROM data cable
31 SCL O EEPROM clock cable
32 UL I PLL unlock detector L: unlock
33 DT O Common data output
34 CK O Common clock output
35 LE O PLLIC H:lockup
36 5MC O Power control except CPU and EEPROM L: unlock
37 AFCO O AFamplifier H:unlock
38 RX O TX/RXVCO H:receive
39 GLED O Green light control H: light
40 RLED O Red light control H: light
41 SAVE O Power saving control H: power saving OFF
42 MUTE O mute control H: mic squelch L: AF squelch
43 5RC O Receiver power control L: unlock
44 5TC O Transmitter power control H: unlock
45 NC I NC
46 NC I NC
47 NC I NC
48 NC I NC
49 NC I NC
50 NC I NC
51 NC I NC
52 NC I NC
53 NC I NC
54 NC I NC
55 2TO O TTS output
56 APC O TX: APC output RX: BPF tune output
57 VCC I CPU power supply 5V
58 VREF I Connect with VCC
59 AVSS I Connect with VSS
60 NC I NC
61 NC I NC
62 NC I NC
63 NC I NC
64 TIBI I CTCSS/CDCSS exterior circuit central point input

RPV516/RPU416 Adjustment Description
- 14 -
Adjustment Description
Program RPV516/RPU416 by using programmer or PC software, or by manual adjustment. Now explain
how to adjust RPV516/RPU416 in manual adjust mode (refer to “software descriptions” for the manual
adjust mode and model set).
Ⅰ. Instruments:
1. Communication analyzer 1 set
2. Spectrum analyzer 1 set
3. 3A/10V power source 1 set
4.DigitalVoltmeter 1set
5.3AAmmeter 1set
Ⅱ. Adjustment:
1.Initialization：
It is necessary to initialize the radio because there is no useful data in EEPROM after it’s
assembled. Short out the SELF points on PCB, turn on the power and two beeps sound, place the
channel selector knob at CH2 [RPV516A], CH3 [RPU416 B] or CH4 [RPU416A], then press [PTT]
while holding [MONI], the channel data and function settings are initialized. Please refer to the
chapter “software descriptions”.
2. Adjustment:
The adjustment of RPV516/RPU416, some are adjusted in user mode, some are in manual adjust
mode. Turn on the power, the radio enters the user mode. While pressing PTT and MONI
simultaneously, turn on the radio，the radio enters the manual adjust mode in 3 seconds. (Refer to
the manual adjust mode in chapter of “software descriptions”).
VCO Section:
Measurement Adjustment
Item Condition Test equipment Terminal Part Method
Specifications/Re
marks
1.Setting Power 7.5V
1.CH: TX HIGH 3.7V±0.1V
2.Transmit VCO lock
voltage 2.CH: TX LOW
TC1
Check RPV516>0.7V
RPU416>1V
1.CH: RX HIGH 3.7V±0.1V
3.Receive VCO lock
voltage 2.CH: RX LOW
Digital Voltmeter CV
TC2
Check RPV516>0.7V
RPU416>1V
Note:
Whether VCO is unlocked can be checked in manual adjust mode. (Signal can be transmitted in manual
mode regardless of the VCO locked or unlocked).

RPV516/RPU416 Adjustment Description
- 15 -
Adjust the receiver section: (in manual adjust mode)
Measurement Adjustment
Item Condition Test
equipment Terminal Parts Method Specifications/
Remarks
1. CH:RX Center
Turn to channel 4 in
manual mode.
TC201
TC202
(RPU416)
TC203
(RPU416)
Adjust the waveform to the
top, and the top is flat, the
bandwidth is about 10MHz,
the sign of RX central
frequency is at the middle
of the waveform.
2. CH: RX Low Turn
to channel 5 in
manual mode.
PTT
(upwards)
MONI
(downwards)
Adjust the waveform to the
top, the sign of RX low
frequency is on the left of
the waveform top.
4. RF amplifier
BPF
3.CH:RX High 3Turn
to channel 6 in
manual mode
Spectrum
analyzer ANT. TP2
PTT
(upwards)
MONI
(downwards)
Adjust the waveform to the
top; the sign of RX high
frequency is on the right of
the waveform top.
1. CH: RX Center.
Turn to channel 13 in
manual mode.
Channel spacing:
Wide
2. CH: RX Center
Turn to channel 14 in
manual mode.
Channel spacing:
Wide
5.Sensitivity
(Wide)
3. CH: RX Center
Turn to channel 15 in
manual mode.
Channel spacing:
Wide
Communica-
tion analyzer
SSG output :
-118dBm
MOD:1KHz
DEV:±3KHz
FILTER:
0.3-3.4KHz
ANT SP Check
SINAD: 12dB
or higher
1. CH: RX center
Turn to channel 13 in
manual mode.
Channel spacing:
narrow
2. CH: RX center
Turn to channel 14 in
manual mode.
Channel spacing:
narrow
6. Sensitivity
(Narrow)
3. CH: RX center
Turn to channel 15 in
manual mode.
Channel spacing :
narrow
Communica-
tion analyzer
SSG output:
-116dBm
MOD:1KHz
DEV:±1.5KHz
FILTER:
0.3-3.4KHz
ANT SP Check SINAD: 12dB or
higher
1.CH: RX center
Turn to channel 7 in
manual mode
Communica-
tion analyzer
SSG output :
-117dBm
Level9
Adjust to close the squelch. Adjust squelch level 9
7. Squelch
2. CH: RX center.
Turn to channel 8 in
manual mode.
Communica-
tion analyzer
SSG output :
-125dBm
ANT SP
PTT
(upwards)
MONI
(downwards) Level3
Adjust to close the squelch. Adjust squelch
level 3

RPV516/RPU416 Adjustment Description
- 16 -
Adjust the transmitter section:
Measurement Adjustment
Item Condition Test
equipment Terminal Parts Method Specifications
/Remarks
8.Transmit
frequency
CH: TX Center
Turn to channel
1 in manual
mode.
Communication
analyzer ANT VR1
Adjust it to center
frequency Error<150Hz
1.CH:TX Center
Turn to channel
2 in manual
mode.
Communication
analyzer
Ammeter ANT
PTT
(upwards)
MONI
(downwards)
Adjust it to:
4.0 W≤Po≤4.8W
(RPV516)
3.7 W≤Po≤4.7W
(RPU416)
I≤1.6A
2.CH: TX Low
Turn to channel 3
Press PTT
Adjust it to:
4.0 W≤Po≤4.8 W
(RPV516)
3.7 W≤Po≤4.7 W
(RPU416)
I≤1.6A
9. Power
3.CH:TX High
Turn to channel 4
Press PTT
Adjust it to:
4.0 W≤Po≤4.8 W
(RPV516)
3.7 W≤Po≤4.7 W
(RPU416)
I≤1.6A
1. CH: TX Center
Turn to channel
13 in manual
mode. Channel
spacing: wide
Press PTT
VR501 Adjust deviation to:
4.2KHz±100Hz Wide
10. Max .
Deviation 2. CH: TX Center
Turn to channel
13 in manual
mode. Channel
spacing: narrow
Press PTT
Communication
analyzer
LPF:15KHz
AF:1KHz
120mV
ANT
MIC
Check:
1.8KHz-2.2KHz Narrow
1. CH: TX Center
Turn to channel
13 in manual
mode. Channel
spacing: wide
Press PTT
VR501 Check:
2.2KHz-3.6KHz Wide
11.MICSENS 2. CH: TX Center
Turn to channel
13 in manual
mode.
Channel spacing:
narrow
Press PTT
Communication
analyzer
FILTER:
0.3-3.4KHz
AF:1KHz
+12mV
ANT
MIC
Check:
1.1KHz-1.8KHz Narrow

RPV516/RPU416 Adjustment Description
- 17 -
Note:
In manual adjust mode, when channel selector knob is positioned at channel 1-channel12, MIC jack can’t connect with
external cables. After adjustment is completed, complete the two SELF points (short circuit),the radio enters model set
mode，then press PTT to disable the manual adjust mode.
Measurement Adjustment
Item Condition Test
equipment Terminal Parts Method
Specifications
/Remarks
1.CH:TX center,
turn to channel 9
in manual mode
67.0Hz
CTCSS
12.CDCSS/
CTCSS
2. CH: TX Center
Turn to channel 16
in manual mode.
Press PTT.
Communication
analyzer LPF:
300Hz ANT VR500
Adjust VR500,
deviation tested on
condition 1 and
condition 2 are
consistent, the
difference≤20Hz
250.3Hz
CTCSS
1. CH: TX Center
Turn to channel 9
in manual mode.
Communication
analyzer
LPF:300Hz
ANT
PTT
(upwards)
MONI
(downwards)
Adjust dev. to:
0.75KHz±50Hz Wide
13.CTCSS
Deviation
2. CH: TX Center
Turn to channel 10
in manual mode.
Adjust dev.
to:0.35KHz±50Hz
Narrow
1. CH: TX Center
Turn to channel 11
in manual mode.
Adjust dev. to:
0.75KHz±50Hz
Wide
14.CDCSS
Deviation
2. CH: TX Center
Turn to channel 12
in manual mode.
Adjust dev. to:
0.35KHz±50Hz
Narrow
15.Low
Battery
level
Turn to channel 3
in manual mode.
Adjust the power
supply voltage at
5.8V
Digital voltmeter
PTT
(upwards)
MONI
(downwards)
Adjust the level to
make the LED flash.
16. TTS
deviation
CH: TX Center
Turn to channel 1
in manual mode.
Communication
analyzer
LPF:15KHz
PTT
(upwards)
MONI
(downwards)
Adjust the dev. to:
3KHz±100Hz
Wide

RPV516/RPU416 Disassembly for Repair
- 18 -
Disassembly for Repair
Separating the front cover assembly from the chassis
1. Remove the two knobs ①and three ring nuts ②.
2. Remove the two screws ③.
3. Expand the right and left sides of the bottom of the front cover assembly，lift the chassis, and remove
it from the front cover assembly.
4. Taking care not to cut the wire assembly connecting the speaker and chassis, separate the chassis
and the front cover assembly.
Removing the lever
Raise the lever on the bottom of the case, insert a small flat screwdriver into the space between the case
and lever, open the case carefully and lift the lever off.
Note: Do not force to separate the cover from the lever.