Kenwood TH-D74E User manual

SERVICE MANUAL
COPYRIGHT © 2016 JVC KENWOOD Corporation No.RA044<Rev.001>
2016/9
B5B-7248-00
144/430MHz DUAL BANDER
RA044<Rev.001>20169SERVICE MANUALB5B-7248-00
TH-D74E
COPYRIGHT © 2016 JVC KENWOOD Corporation
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44
This product complies with the RoHS directive for the European market. This product uses Lead Free solder.

1-2 (No.RA044<Rev.001>)
Document Copyrights
Copyright 2016 by JVC KENWOOD Corporation. All rights reserved.
No part of this manual may be reproduced, translated, distributed, or transmitted in any form or by any means, electronic, mechan-
ical, photocopying, recording, or otherwise, for any purpose without the prior written permission of JVC KENWOOD Corporation.
Disclaimer
While every precaution has been taken in the preparation of this manual, JVC KENWOOD Corporation assumes no responsibility
for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein.
JVC KENWOOD Corporation reserves the right to make changes to any products herein at any time for improvement purposes.
Bluetooth Copyrights
The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by
JVC KENWOOD Corporation is under licence. Other trademarks and trade names are those of their respective owners.
NOTE
• This equipment should be serviced by only qualified technicians.
• Danger of explosion if the battery is incorrectly replaced; replace only with the same type.
• To dispose of batteries, be sure to comply with the laws and regulations in your country or region.
SPECIFICATION
R
GENERAL
Frequency Range Band-A TX 144 - 146, 430 - 440 MHz
RX 136 - 174, 410 - 470 MHz
Band-B RX 0.1 - 76 MHz, 76 - 108 MHz (WFM)
108 - 524 MHz
Mode TX F3E, F1D, F2D, F7W
RX F3E, F1D, F2D, A1A, A3E, J3E, F7W
Operating Temp. Range -20 °C ~ +60 °C (-4°F ~ +140°F)
with Incd. KNB-75L -10 °C ~ +50 °C (+14°F ~ +122°F)
Frequency Stability ±2.0 ppm
Antenna Impedance 50 ohm
Operating Voltage DC-IN DC 11.0 ~ 15.9 V (STD: DC 13.8 V)
BATT DC 6.0 ~ 9.6 V (STD: DC 7.4 V)
Current Consumption: TX (TYP.) EXT.PS 13.8 V HI 1.4 A
MID 0.9 A
L 0.6 A
EL 0.4 A
Battery 7.4 V HI 2.0 A
MID 1.3 A
L 0.8 A
EL 0.5 A
Current Consumption: RX (TYP.) SINGLE Rated Power 260 mA
SQ Close 135 mA
Avg. Save on 48 mA
DUAL Rated Power 310 mA
SQ Close 185 mA
Avg. Save on 50 mA
GPS logger mode 115 mA
Battery Life (Approx.)
Single, Save on, Rate 6:6:48 sec, GPS off
Approx. 10 % shorter when GPS is ON
KNB-74L
(1,100 mAh)
HI 4 hours
MID 5 hours
L 7 hours
EL 9 hours
KNB-75L
(1,800 mAh)
HI 6 hours
MID 8 hours
L 12 hours
EL 15 hours
KBP-9
(Alkaline AAAx6)
HI -
MID -
L 3.5 hours
EL -
Dimensions (W x H x D)
Projections not included
with KNB-74L (1,100 mAh) 56.0 x 119.8 x 29.3 mm (2.20 x 4.72 x 1.15 in)
with KNB-75L (1,800 mAh) 56.0 x 119.8 x 33.9 mm (2.20 x 4.72 x 1.33 in)
with KBP-9 56.0 x 119.8 x 36.0 mm (2.20 x 4.72 x 1.42 in)
Weight (net) Body only 202 g (7.13 oz)
with KNB-74L (1,100 mAh) 315 g (11.1 oz)(w/ Antenna, Belt Clip)
with KNB-75L (1,800 mAh) 345 g (12.2 oz)(w/ Antenna, Belt Clip)
with KBP-9 360 g (12.7 oz)(w/ Antenna, Belt Clip, AAAx6 Battery)

(No.RA044<Rev.001>)1-3
RECEIVER Band A Band B
Circuitry F3E, F2D, F1D, F7W Double Super Heterodyne
A1A, A3E, J3E - Triple Super Heterodyne
IF Frequency 1st IF 57.15 MHz 58.05 MHz
2nd IF 450 kHz 450 kHz
3rd IF (A1A, A3E, J3E) - 10.8 kHz
Sensitivity (TYP.) Amateur Band FM 12dB SINAD,
FM/ NFM
144 MHz 0.18/ 0.22 uV 0.19/ 0.24 uV
430 MHz 0.18/ 0.22 uV 0.20/ 0.25 uV
DV PN9/GMSK
4.8kbps, BER 1%
144 MHz 0.20 uV 0.22 uV
430 MHz 0.22 uV 0.22 uV
SSB 10 dB S/N - 0.16 uV
AM 10 dB S/N - 0.50 uV
Sensitivity (TYP.) Except above
Amateur Band
AM 10 dB S/N 0.3 - 0.52 MHz - 4 uV
0.52 - 1.8 MHz - 1.59 uV
1.8 - 54 MHz - 0.63 uV
54 - 76 MHz - 1.12 uV
118 - 175 MHz - 0.50 uV
200 - 250 MHz - 0.63 uV
382 - 412 MHz - 1.12 uV
415 - 524 MHz - 1.12 uV
FM 12dB SINAD 28 - 54 MHz - 0.32 uV
54 - 76 MHz - 0.56 uV
118 - 144 MHz 0.36 uV 0.36 uV
148 - 175 MHz - 0.36 uV
200 - 222 MHz - 0.36 uV
225 - 250 MHz - 0.36 uV
382 - 400 MHz - 0.50 uV
400 - 412 MHz 0.36 uV 0.36 uV
415 - 430 MHz 0.36 uV 0.36 uV
450 - 490 MHz 0.36 uV 0.36 uV
490 - 524 MHz - 0.63 uV
SSB 10 dB S/N 1.8 - 54 MHz - 0.40 uV
54 - 76 MHz - 0.79 uV
144 - 148 MHz - 0.16 uV
222 - 225 MHz - 0.20 uV
430 - 450 MHz - 0.16 uV
FM BC Band WFM 30 dB S/N 76 - 95 MHz - 1.59 uV
95 - 108 MHz - 2.00 uV
Squelch (TYP.) 0.18 uV 0.25 uV
Channel Selectivity -6 dB 12 kHz or more
-50 dB 30 kHz or less
Spurious Rejection 144 MHz 50 dB or more 45 dB or more
430 MHz 50 dB or more 40 dB or more
IF Rejection 60 dB or more 55 dB or more
Audio Output 7.4 V, 10% Dist. 400 mW or more/ 8 ohm

1-4 (No.RA044<Rev.001>)
Note:
Except for sensitivity, these specifications are guaranteed for Amateur Bands only.
Specifications are subject to change without notice, due to advancements in technology.
TRANSMITTER
RF Power Output EXT.PS 13.8 V /
Battery:7.4 V
HI 5 W
MID 2 W
L 0.5 W
EL 0.05 W
Modulation FM Reactance Modulation
DV GMSK Reactance Modulation
Modulation Deviation FM ±5.0 kHz
NFM ±2.5 kHz
Spurious Emissions HI / MID -60 dBc or less
L -50 dBc or less
EL -40 dBc or less
Microphone Impedance 2 k ohm
GPS
TTFF (Cold start) Approx. 40 sec
TTFF (Hot start) Approx. 5 sec
Horizontal Accuracy 10 m or less
Receive sensitivity(Ta = 25°C, Open sky) Approx. -141 dBm (Acquisition)
Bluetooth
Version, Class Version 3.0, Class 2
Output Power -6 < Pav < 4 dBm
Modulation Characteristics 140 f 1avg 175 kHz
Initial Carrier Frequency -75 f0 +75 kHz
Carrier Frequency Drift ±25 kHz (One Slot Packet)
±40 kHz (Three Slot Packet)
±40 kHz (Five Slot Packet)

(No.RA044<Rev.001>)1-5
SECTION 1
PRECAUTION
This service manual does not describe PRECAUTION.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 Circuit Description
2.1.1 Outline
The TH-D74E is an FM dual-band transceiver designed for amateur radio applications in the 144/430 MHz bands.
2.1.2 Frequency Configuration
This transceiver has two discrete VCO/PLL and IF circuit configurations for the A-band and B-band to achieve simultaneous dual-band
signal reception and full-duplex operation.
The VCO block of the A-band is used as the first local oscillator for VHF and UHF reception in the A-band. The VCO block for the
B-band is composed of two VCOs including modulation circuitry and used as the first local oscillator for the VHF/UHF transmission of
signals and reception of signals in a range of 0.1 to 524 MHz in the B-band.
The 19.200 MHz reference oscillator connected to the PLL IC for the A-band is used to generate a PLL comparison frequency.
The reference oscillator that generates a frequency of 57.600 MHz tripled from the 19.200 MHz is used for the comparison frequency
of the PLL IC for the B-band. Furthermore, this reference oscillator is used as the second local oscillator for the reception of signals
in both A-band and B-band.
Fig.1 Frequency configuration
Table 1 Frequency configuration
MAIN MPU
(DSP)
MAIN MPU
(DSP)
BAR ANT
ANT
1/2,1/4,1/8
TX
BAND B RX
x2
460.8k450.0k
BAND A RX
FM RADIO
DB
58.05M
57.15M
E
BAND A
DEMODULATOR
BAND B
DEMODULATOR
BAND B PLLx3
57.60M19.20M
BAND A PLL
AF AMP
A
C
MIC AMP
TH-D74E (E-type)
A 144.000 ~ 145.995MHz
430.000 ~ 439.995MHz
B 0.100 ~ 75.995MHz
108.000 ~ 523.995MHz
C 136.000 ~ 173.995MHz
410.000 ~ 469.995MHz
D 58.150 ~ 468.045MHz
E 193.150 ~ 412.845MHz

1-6 (No.RA044<Rev.001>)
2.1.3 Receiver System
2.1.3.1 VHF receiver circuit
A band VHF receiver circuit
The reception signal from the antenna passes through the filter circuit and enters the RF amplifier (Q179). The signal amplified by the
RF amplifier (Q179) enters the distribution circuit for signal distribution with the B-band. The distributed signal is amplified by the
second RF amplifier (Q178), passes through the band-pass filter, and enters the mixer (Q281). The signal is converted to a first IF of
57.150 MHz after the signal undergoes upper heterodyne conversion by the first local oscillation frequency. Then the signal is
amplified by the IF amplifier (Q282) after the signal passes through the MCF (XF281), and applied to the IF IC (IC281).
The signal undergoes upper heterodyne conversion in the IF IC (IC281) by the second local oscillation frequency (57.600 MHz) tripled
from the reference frequency (19.200 MHz). Then the signal is converted to a second IF of 450 kHz and detected to generate an audio
signal.
B band VHF receiver circuit
The reception signal from the antenna passes through the filter circuit and enters the RF amplifier (Q179). The signal amplified by the
RF amplifier (Q179) enters the distribution circuit for signal distribution with the A-band. The distributed signal is amplified by the
second RF amplifier (Q193), passes through the band-pass filter, and enters the mixer (IC283). The signal is converted to a first IF of
58.050 MHz after the signal undergoes upper heterodyne conversion by the first local oscillation frequency. Then the signal is applied
to the IF IC (IC284) through the MCF (XF282).
The signal undergoes lower heterodyne conversion in the IF IC (IC284) by the second local oscillation frequency (57.600 MHz) tripled
from the reference frequency (19.200 MHz). Then the signal is converted to a second IF of 450 kHz and detected to generate an audio
signal. While the transceiver is in AM/SSB/CW mode, the signal is converted to a third IF of 10.8 kHz after the signal undergoes upper
heterodyne conversion by the 3rd local oscillation frequency (460.8 kHz). Then the signal is input into the CODEC IC (IC707).
VHF accompanying circuit
Tuning voltage output from the D/A converter (IC671) under the control of the main MPU (IC702) is applied to each band-pass filter
through a discrete variable-capacitance diode so that the respective band-pass filters will be tuned to target frequencies.
Fig.2 VHF receiver circuit
2.1.3.2 UHF receiver circuit
A band UHF receiver circuit
The reception signal from the antenna passes through the filter circuit and enters the RF amplifier (Q172). The signal amplified by the
RF amplifier (Q172) enters the distribution circuit for signal distribution with the B-band. The distributed signal is amplified by the
second RF amplifier (Q171), passes through the bandpass filter, and enters the mixer (Q281). The signal is converted to a first IF of
57.150 MHz after the signal undergoes lower heterodyne conversion by the first local oscillation frequency. Then the signal is amplified
by the IF amplifier (Q282) after the signal passes through the MCF (XF281), and applied to the IF IC (IC281).
The signal undergoes upper heterodyne conversion in the IF IC (IC281) by the second local oscillation frequency (57.600 MHz) tripled
from the reference frequency (19.200 MHz). Then the signal is converted to a second IF of 450 kHz and detected to generate an audio
signal.
BAND B 108~310M
SMB
(To MAIN MPU)
(To MAIN MPU)
(To MAIN MPU)
(To CODEC IC)
(To CODEC IC)
(To CODEC IC)
AFA
SQA
SMA
BAND A 136~260M
D185
Q178 D182/184
AFB
IFOUT
LPF LPF LPF
ANT
DUPLEXER
HPF
ABVS
D180
AB220S
D181
HPF Q179
RF AMP RF AMP
OAGCA
BPF(VCAP)
OBPFA AVS
Q193
RF AMP
OAGCB
D188-191
BPF(VCAP)
D192
BVSOBPFB/APC
Q281
1st MIXER
XF281
MCF
BAND A 1
st IF 57.15M
+/-7.5kHz
Q282
IF AMP BAND A 2nd IF 450k
IC281
2nd MIXER
57.6M
AGC1/2 BPF0/1/2/3
LIMITER
DISCRI LPF
NOISE RECTIFIER
NOISE AMP
XF282
MCF
BAND B1st IF 58.05M
+/-7.5kHz
SQB
IFB
PGA0 2nd MIXER
57.6M
AGC1/2
BAND B 2nd IF 450k
IFBPF
LIMITER
IFBUF
DISCRI
460.8k
(To MAIN MPU)
NOISE RECTIFIER
NOISE AMP
3rd MIXER
IC285 IC286
IFBUF(LPF)
BAND B 3rd IF 10.8k
IC284
ATT
RF SW
RF SW
RF SW
RF SW

(No.RA044<Rev.001>)1-7
B band UHF receiver circuit
The reception signal from the antenna passes through the filter circuit and enters the RF amplifier (Q172). The signal amplified by the
RF amplifier (Q172) enters the distribution circuit for signal distribution with the A-band. The distributed signal is amplified by the
second RF amplifier (Q192), passes through the band-pass filter, and enters the mixer (IC283). The signal is converted to a first IF of
58.050 MHz after the signal undergoes upper heterodyne conversion by the first local oscillation frequency. Then the signal is input
into IF IC (IC284) through the MCF (XF282). The signal undergoes lower heterodyne conversion in the IF IC (IC284) by the second
local oscillation frequency (57.600 MHz) tripled from the reference frequency (19.200 MHz). Then the signal is converted to a second
IF of 450 kHz and detected to generate an audio signal.
While the transceiver is in AM/SSB/CW mode, the signal is converted to a third IF of 10.8 kHz after the signal undergoes upper
heterodyne conversion by the 3rd local oscillation frequency (460.8 kHz). Then the signal is input into the CODEC IC (IC707).
UHF accompanying circuit
Tuning voltage output from the D/A converter (IC671) under the control of the main MPU (IC702) is applied to each band-pass filter
through a discrete variable-capacitance diode so that the respective band-pass filters will be tuned to target frequencies.
Fig.3 UHF receiver circuit
2.1.3.3 HF receiver circuit
HF receiver circuit
The reception signal from the antenna passes through the filter circuit and enters the RF amplifier (Q190). The signal amplified by the
RF amplifier (Q190) enters the mixer (IC283) after the signal is further amplified by the second amplifier (Q191). The signal is
converted to a first IF of 58.050 MHz after the signal undergoes upper heterodyne conversion by the first local oscillation frequency.
Then the signal is applied to the IF IC (IC284) through the MCF (XF282). The signal undergoes lower heterodyne conversion in the
IF IC (IC284) by the second local oscillation frequency (57.600 MHz) tripled from the reference frequency (19.200 MHz). Then the
signal is converted to a second IF of 450 kHz and detected to generate an audio signal.
While the transceiver is in AM/SSB/CW mode, the signal is converted to a third IF of 10.8 kHz after the signal undergoes upper
heterodyne conversion by the 3rd local oscillation frequency (460.8 kHz). Then the signal is input into the CODEC IC (IC707).
BAND B 310~524M
SMB
(To MAIN MPU)
(To MAIN MPU)
(To MAIN MPU)
(To CODEC IC)
(To CODEC IC)
(To CODEC IC)
AFA
SQA
SMA
BAND A 410~470M
D185
D173
Q171 D171/172
AFB
IFOUT
LPF HPF
ANT
DUPLEXER
AUS
BUS
D193 Q172
RF AMP RF AMP
OAGCA
BPF(VCAP)
OBPFA AVS
Q192
RF AMP
OAGCB
D177/178
BPF(VCAP)
D179
BVSOBPFB/APC
Q281
1st MIXER
XF281
MCF
BAND A 1
st IF 57.15M
+/-7.5kHz
Q282
IF AMP BAND A 2nd IF 450k
IC281
2nd MIXER
57.6M
AGC1/2 BPF0/1/2/3
LIMITER
DISCRI LPF
NOISE RECTIFIER
NOISE AMP
XF282
MCF
BAND B1st IF 58.05M
+/-7.5kHz
SQB
IFB
PGA0 2nd MIXER
57.6M
AGC1/2
BAND B 2nd IF 450k
IFBPF
LIMITER
IFBUF
DISCRI
460.8k
(To MAIN MPU)
NOISE RECTIFIER
NOISE AMP
3rd MIXER
IC285 IC286
IFBUF(LPF)
BAND B 3rd IF 10.8k
IC284
ATT
RF SW RF SW
RF SW

1-8 (No.RA044<Rev.001>)
BAR Antenna circuit
The bar antenna can be selected for HF reception.
The reception signal from the bar antenna passes through the tuning circuit and enters the RF amplifier (Q190). Then the signal is
received on the same path in the HF receiving circuit.
Fig.4 HF receiver circuit
2.1.3.4 FM Tuner receiver circuit
FM Tuner receiver circuit
The reception signal from the antenna passes through the filter circuit and enters the RF amplifier (Q195). The signal amplified by the
RF amplifier is further amplified by the second RF amplifier (Q675) after the signal passes through the filter circuit, and enters the FM
Tuner IC (IC674). The RF signal is demodulated in the FM tuner IC (IC674) and converted into an audio signal.
Fig.5 FM Tuner receiver circuit
2.1.4 Transmitter System
2.1.4.1 Transmitter circuit
The VCO (B-band) VHF transmission signal that is sent from the RF amplifier (Q361) passes through the band switches (D35 and
D32). The pre-drive amplifier (IC1) and drive amplifier (Q6) amplify the signal. The signal passes through the band switches (D22 and
D26), and the final amplifier (Q2) amplifies the signal to the final output level. Then the signal passes through the antenna switches
(D13, D14, and D45), triplexer, and LPF, and is fed to the antenna.
The VCO (B-band) UHF transmission signal that is sent from the RF amplifier (Q361) passes through the band switches (D36 and
D33). The pre-drive amplifier (IC1) and drive amplifier (Q6) amplify the signal. The signal passes through the band switch (D31), and
the final amplifier (Q2) amplifies the signal to the final output level. Then the signal passes through the antenna switches (D42, D43,
D18, and D19), triplexer, and LPF, and is fed to the antenna.
2.1.4.2 APC circuit
The automatic power control (APC) circuit ensures stable TX power and is in control of TX power by detecting voltage generation from
the drain current of the final amplifier (Q2) in use.
The operational amplifier circuit (consisting of IC3 and Q12) amplifies the voltage on R55 and R57 generated by the drain current of
the final amplifier, and the generated voltage (CURR) is input into the main MPU (IC702) through the A/D converter (IC725).
The main MPU (IC702) compares the transmission CURR voltage and adjustment CURR voltage and changes the APC voltage
according to the comparison result. The main MPU (IC702) inputs the APC voltage into the gates of the drive amplifier (Q6) and
the final amplifier (Q2) through the D/A converter (IC671) and operational amplifier (IC287), thus changing the TX power level.
In the power adjustment menu, power adjustments are made by changing the APC voltage (APC digit) value. The APC loop function is
OFF in the power adjustment menu. When an appropriate APC voltage level is determined, the APC voltage and CURR voltage will
be stored as adjustment values. The adjustment values are used for APC performance while the transceiver is in user mode.
ATT
AFB
IFB
RF AMP RF AMP SQB
(To CODEC IC )
SMB
(To CODEC IC)
IFOUT
IC284
57.6M
/SWANT_S
/MWANT_S
BHFS
/SWANT_S
/MWANT_S
D199
LPF
D194/195/202
TUNING
OBPFB/APCSWANT_S
MWANT_S
BAR ANT
D198
SWANT_S
MWANT_S
BHFS
LPF LPF LPF
ANT
DUPLEXER
D197 Q190 Q191
OAGCB OAGCB BHFS
BAND B 0.1~76M
IC283
1
st MIXER
XF282
MCF
BAND B 1
st IF 58.05M
+/-7.5kHz
PGA0 2ndMIXER AGC1/2
BAND B 2nd IF 450k
IFBPF
LIMITER
IFBUF
NOISE AMP
DISCRI
NOISE RECTIFIER
460.8k
3rd MIXER
IC285 IC286
IFBUF(LPF)
BAND B 3rd IF 10.8k
Q187
INVERTER
SWANT_S
MWANT_S
BHFS
D204
RF SW RF SW RF SW
RF SW
FM TUNER Dout
LPF LPF LPF
ANT
DUPLEXER
/EANTS
D672
FM TUNER 76~108M
D673/674
BPFR
Q675
RF AMP FM TUNER
LNA(AGC) 2
nd
MIXER ADC
IC674
(To MAIN MPU
)
BFMS
D201
RF AMP
Q195
RF SW RF SW
LPF

(No.RA044<Rev.001>)1-9
2.1.4.3 Thermal protection circuit
The sub MPU (IC661) monitors the detected voltage (FTH) of the thermistor (TH1) arranged for the prevention of the thermal
breakdown of the final amplifier (Q2) in use. An APC voltage (OAGCA/APC) change will occur when the temperature exceeds the
preset temperature, at which time the TX power will be controlled to prevent excessive heat generation.
Fig.6 Transmitter circuit
2.1.5 VCO-PLL Circuit
2.1.5.1 Oscillator circuit
A standard reference frequency of 19.2 MHz is generated from the TCXO (X362) of the reference oscillation circuit is divided in the
PLL IC (IC364) to provide a comparison frequency of 800 kHz. The reference frequency tripled to 57.600 MHz in the RF amplifier block
(Q382 and Q378) is divided in the PLL IC (IC284) to provide a comparison frequency of 480 kHz.
Furthermore, a reference frequency of 57.600 MHz is used as the second local oscillation frequency of both A-band and B-band.
The A-band VCO signal is generated and amplified by the oscillation amplifier (Q386) and sent to the F-in amplifier (Q384) and F-out
amplifier (Q381) through the buffer amplifier (Q383). The B-band VCO signal is generated and amplified by the two oscillation
amplifiers (Q368 and Q369) and sent to the F-in amplifier (Q364) and F-out amplifier (Q365) through the buffer amplifier (Q389).
The signal will be branched directly to the transmission side and the reception side if the signal is not divided after the signal passes
through the F-out amplifier. If the signal is split, the signal will be branched to the transmission side and reception side through the
frequency divider (IC361) and amplifier (Q363). The signal on the reception side is provided to the mixer (IC283). The signal on the
transmission side is provided to the pre-drive (IC1) after the signal passes through the amplifier (Q361). The reference oscillator
modulates the signal at the time of transmission.
2.1.5.2 Phase comparator
These PLL ICs of fractional-N type divide the input oscillation frequency and reference frequency according to PLL data from the sub
MPU (IC661) and make phase comparison to achieve the PLL synthesizer according to the desired step frequency.
2.1.5.3 Lock voltage
Pulse signals obtained by phase comparison in the respective PLL ICs (IC284 and IC364) are swept output from the built-in charge
pumps and used as the control voltages of the respective VCOs for oscillation frequency control after the loop filters eliminate the
ripples in the signals.
RX
D36
RF SW
Q361 IC1
PRE DRV AMP
Q6
DRIVE AMP
Q2
FINAL AMP
D2,D3
D18,D19
D42,D43
UHF
LPF
UHF
HPF
UHF
LPF
ANT
RX
From
VCO B
RX
TH1
FTH
IC661
D33
RF SW
RF SW RF SW
430T
144T
D35 D32
RF SW
MATCH
RF SW
MATCH
RF SW
430T
144T
MATCH
MATCH
RF SW
RF SW
VHF LPF
VHF
LPF
220
LPF
220
HPF
D4,D5
D13,D14
D45
D31
D22 D26
RF SW RF SW
ATT
Voltage
shift
DET1
DCSW Q5
Q8
D10,D17
DCSW
D11,D12 D8,D9
Q7
DCSW
45TXS
APCSW
IC287
OAGCA/APCAGCA/APC
TH SUB
MPU
IC671
D/A
ch1,ch6
IC702
MAIN
MPU
R55,R57
IC3,Q12
+
-
+B1
To
FINAL AMP
DRAIN
IC725
A/D
DET1
CURR
430T
144T

1-10 (No.RA044<Rev.001>)
2.1.5.4 Unlock detection circuit
The LD pins (pin 39 of the IC284 and pin 7 of the IC364) of the PLL ICs will output L-level signals when the PLLs are unlocked. The
main MPU (IC702) is in control of the switching timing of transmission and reception by monitoring the output.
Fig.7 VCO-PLL circuit
2.1.6 Power Supply Circuit
2.1.6.1 DC-IN circuit
The +B power supply will be provided with a constant voltage of 8.3 V through the charging DC-DC driver IC (IC585) and the switching
FET (Q580) when power at 11.0 to 15.9 VDC is supplied to the DC-IN JACK. At the same time, the VINOK pin (pin 5 of IC585) will be
set to a high level.
When the +B voltage is 5.3 V or higher, the output of the comparator IC (IC591) will be fixed to a low level and the collector voltage of
the Q585 will be set to a high level.
When the VINOK pin of the IC585 is set to a high level, the monostable multivibrator IC (IC588) will output a single-pulse signal. When
a battery at 5.5 V or higher is connected, the monostable multivibrator IC (IC588) will output a single-pulse signal.
The EN pin (pin 1) of the DC-DC module (IC584) will be set to a high level when the power switch is pressed or when the single-pulse
signal is input into the logic circuitry consisting of the OR circuit (IC592), AND IC (IC587), and NOT circuit (Q584).
When the EN pin of the IC584 is set to a high level, the IC584 will output a constant voltage of 4.0 V to the 40C power supply, and the
main MPU (IC700) will start.
When the main MPU starts, the main MPU will transmit a charge control instruction to the IC585 and set the 40CS to a high level at
the same time.
The EN pin of the IC584 will be kept at a high level as the 40CS is set to a high level. As a result, the IC584 will output 4.0 V to the
40C continuously, and the main MPU will continue to operating.
TCXO_VCON
Freq
LPF
BAND B 1st LOCAL
X362
BPF
Q378,382
TRIPPLER IC284
PHASE
DETECTOR
BAND B PLL IC
LPF
Q391
(To TX)
LPF
Q368,369
Q364
FIN AMP
Q389
BUFFER
Q365
LOCAL AMP
VCO B
D365
IC361
1/2,1/4,1/8
Q363
LOCAL AMP
D364 D361
Q361
TX AMP
BAND A 1st LOCAL
BAND A PLL IC
R DIVIDER
IC364
PHASE
DETECTOR
N DIVIDER
LPF Q386
Q384
FIN AMP
Q383 Q381
LOCAL AMPVCO A
D378
Q380
DOUBLER
D38
Q376
LOCAL AMP
IC661
SUB MPU
VCO_MOD
IC707
R DIVIDER N DIVIDER
CONT PCB
DAC
IC671 D366-367
MOD
CODEC IC
LDB
LDA
BAND B 2nd LOCAL
BAND A 2nd LOCAL
DIVIDER
(To MAIN MPU)
RF SW
RF SW RF SW
RF SW
RF SW
BUFFER

(No.RA044<Rev.001>)1-11
2.1.6.2 Lithium-ion Battery charging control circuit
The IC585 will charge the lithium battery by receiving the charge control instruction from the main MPU. The IC585 will detect the
battery voltage and the battery charging current, and operate as shown below.
If the battery voltage is less than 6.0 V, the IC585 and Q580 will supply a constant voltage of 6.0 V to the +B power supply, and control
the gate voltage of the Q581 and perform pre-charging at a charging current of 128 mA.
If the battery voltage is 6.0 V or higher and less than 8.4 V, the Q581 will be turned ON. Then the IC585 and Q580 will perform
switching (constant current charging) so that the charging current will be a constant current as specified, and supply a voltage
almost the same as the battery voltage to the +B power supply.
When the voltage battery rises to 8.4 V, the Q581 will be kept turned ON, and the IC585 and Q580 will provide the +B power supply
with a constant voltage of 8.4 V and perform the constant voltage charging of the battery.
During the constant voltage charging of the battery, the charging current will gradually decrease. The battery will be deemed to be fully
charged when the charging current reaches 128 mA or below, and the Q581 will be turned OFF, and the charging will be completed.
If the charging of the battery is completed while the transceiver is in signal reception or a standby state, the IC585 and Q580 will
continue providing a constant voltage of 8.4 V to the +B power supply.
If the charging of the battery is completed while the transceiver is in a standby state, the main MPU will send a charge stop
instruction to the IC585, and the IC585 will stop charging the battery. The main MPU will set the 40CS to a low level, thus stopping
the operation of the IC584 to block the 40C power supply. Then the main MPU will stop operating, and the transceiver will be turned off.
If the transceiver starts transmission while the battery is charged, the main MPU will send a charge stop instruction to the IC585 to
stop charging the battery. Upon completion of transmission, the main MPU will transmit a charge control instruction to the IC585 to
resume charging the battery.
2.1.6.3 Protection circuit
The main MPU monitors the temperature detected by the thermistor (TH700). If the temperature is out of an optimal temperature range
of 0°C to 40°C, the main MPU will transmit a charge stop instruction to the IC585 to stop charging the battery.
The main MPU monitors the DC-IN JACK voltage. If an overvoltage beyond guarantee is applied, the main MPU will stop the operation
of the transceiver and protect the circuits.
Fig.8 Power supply circuit (TXRX PCB)
47RA
45PDT
144T
220T
430T
ATT
33C
33CBF
33TX
Q585
3.3V_AVR
INVERTER
(From
SUB MPU)
Q584
INVERTER
VTX1
CKY
(To CONT PCB)
40C
5C
33SS
144TS
220TS
430TS
VIN RBDRV HSDRV
LSDRV
BATDRV
ACSP ACSN SW
VBAT BCSN VINOK
40CS
(From MAIN MPU)
CHG_TH
(To MAIN MPU)
D577
J576
DC IN
11.0~16.0V
F577
3.15A FUSE
Q579
FET SW (To CONT PCB)
+B
47C
+B
(To CONT PCB)
R615 Q580
FET SW
BCSP
7.4V
(To MAIN MPU)
BAT_DET
+BATT
GND
S
D576
F576
4A FUSE
TH700
THERMISTOR
Q581
FET SW
R618
VDCIN
COMPARATOR IC
IC591
IC588
ONE SHOT
POW SW
IC592
OR CIRCUIT
IC587
AND CIRCUIT
4.0V_DC/DC
IC584
EN
4.7V_AVR
IC584
40C
SWQ582
AUS AVS
SWQ9
SWQ577
SWQ578
SWQ576
3.3V_AVRIC582 33S
33CAS
3.3V_AVRIC581 33CA
33CBS
3.3V_AVRIC578 33CB
RIPPLE F
Q375
SWQ388
VTX1
33CS
3.3V_AVRIC580
33BU
33BUS
3.3V_AVRIC576
33BV
33BVS
3.3V_AVRIC577
33RA
33RAS
3.3V_AVRIC579
33RB
33RBS
3.3V_AVRIC583
IC593
BFMS
33RAD
33IF
33IFS
3.3V_AVRIC590
33CS
CHARGE PIC365 5.3V_AVRIC363
IC585
3.1V_AVR
IC586
D578 Q10,D29-30
SW
144TS
SWQ14
430TS
TH

1-12 (No.RA044<Rev.001>)
Fig.9 Power supply circuit (CONT PCB)
2.1.7 AF signal system
2.1.7.1 Reception AF circuit
Demodulation signal circuit
Reception AF signals demodulated by the respective IF ICs (IC281 and IC284) for the A-band and B-band are independently applied
to the main MPU/DSP (IC702) through the CODEC IC (IC707). Each signal is deemphasized under loudness control. Then the signals
pass through the CODEC IC (IC707), enter to the AF amplifier (IC880) for the last amplification of the signals, pass through the SP
MUTE switches (Q881 and Q883), and drive the SP.
Furthermore, the transceiver can save its power consumption in save mode by turning OFF the AVR (IC882) for the AF amplifier
(IC880) according to an AFM control signal from the main MPU (IC702).
Tone decode circuit
Reception AF signals for the A-band and B-band will be independently applied to the MPU/DSP (IC702) if the CTCSS, DCS, and
Weather Alert function are ON, and selected signal components will be amplified to a necessary level for decoding processing.
BEEP, DTMF circuit
The BEEP and DTMF signals generated from the main MPU/DSP (IC702) are applied to the AF Amplifier (IC880), and the signals
pass through the SP MUTE switches (Q881 and Q883) and drive the SP.
When the BEEP and DTMF signals are sent, the AF MUTE switch in the main MPU/DSP (IC702) will cause a MUTE-ON state, and
the signals will be sent separately from the reception AF signal.
Squelch circuit
The amount of noise (SQA and SQB) and the signal strength (SMA and SMB) obtained from the respective IF ICs (IC281 and IC284)
are retrieved by the main MPU/DSP (IC702) to control the AF MUTE switch.
MODAMP
BUTTON BATTCN703
40C
12M
/33ADS
(From TXRX PCB)
+B
(From TXRX PCB)
47C
3.3V_AVR
IC714 33AD
3.3V_AVR
IC712 33M
1.8V_DCDC
IC718 18M
1.8V_AVR
IC708 RAD
IC722 1.2V_DCDC
31BU
3.1V_AVR
IC717
30M
3.0V_AVR
IC713
33SD
33SDS
3.3V_AVRIC700
30GPS
GPS_ANT
_SW
3.0V_AVRIC933
33BT
3.3V_AVRIC932
(From TXRX PCB)
MODBS
SW
Q704
LAMPS
6.8V_AVRIC731
For LEDs
6.8V
AFBS
6.8V_AVRIC882 AFB
40C
LOAD SWIC724 18F
1.2V_AVRIC723 12BU
1.8V_AVR
IC931 18BT
DACS
SW
Q886 DAC
MICBS
SW
Q884 MICB

(No.RA044<Rev.001>)1-13
FM tuner circuit
The FM broadcasting band (76MHz~108MHz) signal can be received using an SMA antenna.
The reception signal passes through the band-pass filter and enters the RF amplifier (Q675) for the amplification of the signal, and
the signal is applied to the FM tuner IC (IC674). The signal is demodulated in the FM tuner IC to generate an audio signal and
de-emphasized. Then the signal is applied to the main MPU/DSP (IC702) for loudness control. Then the signal enters the AF
amplifier (IC880) for the last amplification of the signal, passes through the SP MUTE switches (Q881 and Q883), and drives the SP.
Fig.10 Reception AF circuit
2.1.7.2 Transmission AF circuit
Modulation signal circuit
The transmission AF signal from the microphone is amplified by the MIC amplifier (IC881), applied to the main MPU/DSP (IC702)
through the CODEC IC (IC707), and pre-emphasized.
Each signal made in the main MPU/DSP (IC702) is processed as shown below. The TONE and DTMF signals are pre-emphasized
here. Packet transmission data at 1200 bps is subjected to the baseband filter and sub-carrier modulation. Packet transmission data
at 9600 bps is subjected to the baseband filter only.
The transmission AF signal that has been level adjusted to an appropriate value passes through the CODEC IC (IC707), and then
branched into two. One of them is amplified by the MOD VCO AMP (IC720) and applied as a high-speed modulation signal (MOD) to
the D/A converter (IC671). Then the signal is applied to the VCO B. The other is amplified by the MOD TCXO AMP (IC720) and applied
to the reference oscillator (X362).
VOX circuit
The transmission AF signal is amplified by the VOX amplifier (IC881) and detected by the DC-detector (D882) to obtain a DC voltage
in proportion to the input signal level. This voltage is input into the main MPU/DSP (IC702) to monitor the audio signal level.
Fig.11 Transmission AF circuit
2.1.8 Control system
The control circuit consists of the main MPU/DSP (IC702), its peripheral circuits, and sub MPU (IC661). The IC702 has the following
primary roles.
(1) Switching of transmission and reception by the PTT signal.
(2) Reading of the system program from the memory.
(3) Control of the audio mute circuit according to decode data.
The IC661 has the following primary roles.
(1) Frequency program transfer to the PLL and IF IC control.
2.1.8.1 MAIN MPU
The main microprocessor with digital signal processor (MPU/DSP) (IC702) incorporates a 32-bit RISC processor, fixed- and floating-
point VLIW digital signal processors, and peripheral functions.
This microprocessor operates at a 139.2 MHz clock rate and 3.3/1.8/1.2 VDC. The microprocessor controls the transmission and
reception of data to and from the flash memory, mobile DDR, control circuit, display circuit, sub MPU, and external devices.
D672
AFA
AFB_FM
6.8V_AVR
FM Tuner
Din
SP GND
SPMI
AFBS
IC702
EXT SP
INT SP
Q881,883
SP SW
IC880
AF PA
Q885
IC882
IC707
CODEC IC
J880
SP / MIC
DE EMPHASIS
AF VOLUME
BEEP, DTMF
/EANTS
D673/674
BPF(VCAP)
BPFR
Q675
RF AMP
FM TUNER
LNA(AGC) 2nd MIXER ADC
IC674
(From TXRX PCB)
(From
TXRX PCB
)
(From TXRX PCB)
SQB
SQA
SMB
SMA
RF SW
DC SW
SP SW
Freq
VOX
1200sps
DATA
TONE
DTMF
SUB CARRIER LPF
PRE EMPHASIS TCXO_VCON
VCO_MOD
D882
VOX DET
J880
SP / MIC
EXT MIC
INT MIC
IC881
MIC AMP
IC707
CODEC IC IC720
MOD AMP DAC
IC671
(To TXRX PCB)
IC702
AGC
AGC
PRE EMPHASIS
9600sps
DATA
LPF AGC
AGC
(From TXRX PCB)
(To TXRX PCB)

1-14 (No.RA044<Rev.001>)
2.1.8.2 Memory Circuit
The memory circuit consists of the main processor (IC702), mobile DDR (IC701), and flash memory (IC705).
The flash memory has a capacity of 256 Mbits, including a transceiver control program and recording data for the MPU. The mobile
DDR is has a capacity of 512 Mbits. The MPU copies the program from the flash memory to mobile DDR. The MPU uses the mobile
DDR as a work area.
2.1.8.3 LCD
The main MPU (IC702) is in direct control of the LCD.
2.1.8.4 Key Detection Circuit
The I/O expansion IC (IC730) is used to detect the keys. The IC730 detects a key pressed, which will be reported to the main MPU
(IC702) through the serial line.
2.1.8.5 SUB MPU Circuit
The sub MPU (IC661) consists of an ARM-based 32-bit processor and a 64-kilobyte flash memory. The sub MPU is in control of the
IF IC and PLL IC.
2.1.8.6 DSP
The DSP circuit consists of the MPU/DSP (IC702) and a baseband signal. The DSP operates at a 139.2 MHz clock rate, the I/O section
operates at 3.3/1.8 V, and the core section operates at 1.2 V.
2.1.8.7 PC Port
The PC Port supports connections to external equipment (PCs) through the USB connector. The PC Port communicates with the main
MPU (IC702).
2.1.8.8 SD slot
The SD Port supports micro SD memory cards through the micro SD memory card connector. The SD Port communicates with the
main MPU (IC702).
2.1.8.9 Bluetooth/GPS Circuit
The Bluetooth/GPS circuit mainly consists of the Bluetooth/GPS IC (IC935).
The Bluetooth/GPS requires two clocks, one of which is the 19.2 MHz (X930) clock and the other is the slower clock at 32.768 kHz
for the UART.
The Bluetooth/GPS IC uses the HCI UART and AI2 UART to communicate with the main MPU. The level shift ICs (IC930, IC936, and
IC937) perform the level conversion of digital audio (PCM) at the UART as the interface between the main MPU (IC702) and Bluetooth/
GPS IC (IC935).
The two discrete external regulators (IC931 and IC932) provide power at 1.8 V and 3.3 V to the Bluetooth/GPS IC.
Fig.12 Control circuit
5 x 5 KEY MATRIX
/RST
I2C
AFB_FM
TXRX PCB
I2C
MMCSD1
240x180LCD
USB
McASP
/IF_CS_B
/IF_CS_A
SPI
/PLL_A
DDR
/CS2
/CS4
EMIF
IC671
SPI0
/ADC
SPI1
/CODEC_CS
McASP
McASP
UART1
UART2
UART0
IC702
MAIN MPU
IC705
FLASH(256Mb)
IC701
mDDR(512Mb)
IC661
SUB MPU
IC935
GPS/BTIC
FM TUNER
IC674
IC707
CODEC IC
AFA
IC725
16CH 8bit ADC
SPI0
/EVCS
8CH8bitDAC
IC364
PLL IC
IC281
BAND A IF IC
IC284
BAND B IF IC
AFB_FM
J700
J701
MICRO SD SLOT
RTC
X701
TCXO19.2M
X700
IC730
I/O EXPANDER
IC585
CHARGE IC
PC PORT
40C
RESET IC
IC703

(No.RA044<Rev.001>)1-15
Fig.13 Bluetooth/GPS circuit
GPS & BT RTC
TCXO_CLK_REQ
33BT
18BT
12M
(From TXRX PCB)
40C
BT ANT (METAL LINE)
/BT_SHUTDOWN
/GPS_SHUTDOWN
BCLK
WCLK
BT_AUD_DO
BT_AUD_DI
RTS2
CTS2
TXD2
RXD2
TXD1
RXD1
33BT
33BT
18BT
18_GPS_RX
18_GPS_TX
18BT_HCI_RX
18BT_HCI_TX
18BT_HCI_CTS
18BT_HCI_RTS
18BT_AUD_FSYNC
18BT_AUD_CLK
18BT_AUD_OUT
18BT_AUD_IN
18BT
18BT
IC702
MAIN MPU
IC935
GPS/BTIC
IC937
IC936
LEVEL CONVERTER
33BT
IC930
BPF
FL932 PAD
30GPS
GPS_ANT_SW
3.0V_AVRIC933
3.3V_AVRIC932
1.8V_AVRIC931
SAW
FL931 C973
ANT
GPS ANT CN
CN931
X930
TCXO19.2M
Q930
FET SW
X931
AI2I/F
HCI I/F
AUDIO
I/F
LEVEL CONVERTER
LEVEL CONVERTER
FET
SW

1-16 (No.RA044<Rev.001>)
2.2 COMPONENTS DESCRIPTION
2.2.1 TX-RX UNIT (XC1-138E-01)
Ref. No. Use / Function
Operation/Condition/Compatibility
IC1 RF AMP TX AMP
IC3 APC AMP
IC281 IF(A-band) A-band
IC283 1st Mixer B-band
IC284 IF(B-band) B-band
IC285 3rd Mixer B-band
IC286 IF AMP B-band
IC287 Buffer(A-band) OP AMP
IC288 Buffer(B-band) OP AMP
IC361 Divider Local B-band
IC363 5C AVR 5.3V regulator
IC364 PLL A-band
IC365 6.6V DCDC Charge pump
IC576 33BU AVR 3.3V regulator
IC577 33BV AVR 3.3V regulator
IC578 33CB AVR 3.3V regulator
IC579 33RA AVR 3.3V regulator
IC580 33C AVR 3.3V regulator
IC581 33CA AVR 3.3V regulator
IC582 33S AVR 3.3V regulator
IC583 33RB AVR 3.3V regulator
IC584 40C DCDC 4.0V DC/DC
IC585 Battery Charger 8.4V DC/DC Driver IC with
Battery Charger
IC586 31BU AVR 3.1V AVR
IC587 AND SW Power ON Logic for DC IN
or Battery Insert
IC588 Pulse Generator Power ON Logic for DC IN
or Battery Insert
IC589 47C AVR 4.7V AVR
IC590 33IF AVR 3.3V AVR
IC591 AMP Power ON Logic for DC IN
or Battery Insert
IC592 OR Circuit Power ON Logic for DC IN
or Battery Insert
IC593 33RAD AVR 3.3V AVR
IC661 Sub MPU Sub CPU
IC662 AND SW A-band PLL IC Control Signal
IC663 AND SW B-band PLL IC/FM IC Control
Signal
IC671 DA Converter Signal level adjust
IC672 Inverter Oscillation circuit for FM tuner IC
IC673 AND SW BCLK, WCLK on/off
IC674 FM tuner FM radio
IC675~677 Gate SW SDO0, SCK0, /EVCS on/off
IC700 33SD AVR 3.3V AVR
IC701 LPDDR Program for operation
IC702 Main MPU CPU with DSP
IC703 Reset 3.5V detect
IC704 /BINT 5.0V detect
IC705 FLASH Store the program and user data
IC707 CODEC coder/decoder for IF and AF
IC708 CODEC AVR 1.8V for CODEC
IC709 LED driver LCD backlight driver
IC710 AND SW LCD backlight control
IC711 Inverter Oscillation circuit for CODEC
IC712 33M AVR 3.3V regulator
IC713 30M AVR 3.0V regulator
IC714 33AD AVR 3.3V regulator
IC715 Level shift Level shift 1.8V -> 3.1V
IC717 31BU AVR 3.1V regulator
IC718 18M DCDC 1.8V DC/DC
IC719 AND SW VINOK on/off
IC720 MOD AMP OP AMP
IC721 ADC VREF 2.1V ref for ADC
IC722 12M DCDC 1.2V DC/DC
IC723 12BU AVR 1.2V regulator
IC724 Load SW 18M on/off
IC725 ADC Signal level converter
IC726,732 Bus SW Analog signal on/off
IC728 AND SW PWR on/off
IC730 I/O Expander Key scan and LCD backlight
control
IC731 LAMP B Variable regulator (6.8V)
IC733 SW Pull up switch
IC880 AF AMP SP output
IC881 MIC AMP OP AMP
IC882 AF AMP AVR Variable regulator (6.8V)
IC930 Level shift Level shift 1.8V <=> 3.3V
IC931 18BT AVR 1.8V regulator
IC932 33BT AVR 3.3V regulator
IC933 30GPS AVR 3.0V regulator
IC935 BT and GPS Bluetooth and GPS control
IC936,937 Level shift Level shift 1.8V <=> 3.3V
Q2 RF AMP TX final AMP(VHF/UHF)
Q4 SW VHF TX
Q5 SW Band SW(VHF,UHF)
Q6 RF AMP TX drive AMP
Q7 SW APC slope change SW
Q8 DC SW TX on/off
Q9,10 DC SW 47C on/off
Q11 DC SW UHF TX
Ref. No. Use / Function
Operation/Condition/Compatibility

(No.RA044<Rev.001>)1-17
Q12 APC AMP
Q13 DC SW VHF TX
Q14 DC SW ATT
Q171 RF AMP UHF RX A-band
Q172 RF AMP UHF RX
Q173 SW UHF RX
Q174 SW UHF RX A-band
Q175 SW UHF RX B-band
Q176 SW VHF RX
Q177 SW 220M RX
Q178 RF AMP VHF/220M RX A-band
Q179 RF AMP VHF RX
Q180 SW VHF/220M RX
Q181 SW VHF RX A-band
Q182 SW VHF RX B-band
Q183 SW MW bar antenna
Q184 SW HF RX
Q185 SW SW bar antenna
Q186~189 SW ANT switch
Q190,191 RF AMP HF RX B-band
Q192 RF AMP UHF RX B-band
Q193 RF AMP VHF/220M RX B-band
Q194 SW UHF RX
Q195 RF AMP FM Radio
Q196 SW HF/FM radio
Q197 SW FM Radio
Q281 1st Mixer A-band
Q282 IF AMP A-band
Q283 DC SW Current switch
Q361 RF AMP TX AMP
Q362 SW Fin switch
Q363 RF AMP Local B-band
Q364 RF AMP Fin B-band
Q365 RF AMP Local B-band
Q368,369 Oscillator VCO2 B-band
Q371 SW VCO2 B-band
Q372 SW VCO1 B-band
Q373,374 SW VCO Shift B-band
Q375 RIPPLE FILTER VCO B-band
Q376 RF AMP Local AMP A-band
Q377 SW Local AMP A-band
Q378 RF AMP TRIPLER
Q379 SW DOUBLER A-band
Q380 RF AMP DOUBLER A-band
Q381 RF AMP Buffer
Q382 RF AMP TRIPLER
Ref. No. Use / Function
Operation/Condition/Compatibility
Q383 RF AMP Buffer
Q384 RF AMP Fin A-band
Q385 RIPPLE FILTER VCO A-band
Q386 Oscillator VCO A-band
Q387 SW VCO Shift A-band
Q388 DC SW 33TX on/off
Q389 RF AMP Buffer
Q390 DC SW Local B-band
Q391 SW Loop Filter B-band
Q576 DC SW UHF TX
Q577 DC SW VHF TX
Q579 SW DC IN
Q580 SW Switching FET for 8.4V DC/DC
with Battery Charger
Q581 SW Battery
Q582 DC SW 1st Mixer A-band
Q584,585 Inverter Power ON Logic for DC IN or
Battery Insert
Q661 SW Beet Shift
Q675 RF AMP RX signal
Q700 SW Beat shift
Q701 Level shift +B -> 3.3V
Q702 SW 33AD
Q703 SW LCD reset
Q704 SW MOD AMP on/off
Q706 SW 18M DC/DC on/off
Q707 SW Bus switch on/off
Q711 SW TX/busy LEDs on/off
Q712 SW VBUS on/off
Q881,883,
885
SW SP mute
Q884 SW MIC AMP on/off
Q886 SW 47C on/off
Q930 SW TCXO(GPS) on/off
D2,3 RF SW UHF RX
D4,5 RF SW VHF RX
D8,9 RF SW ATT
D10 Detector TX protector
D11,12 RF SW ATT
D13,14 RF SW VHF TX
D17 Detector TX protector
D18,19 RF SW UHF TX
D20 Reverse current
protector
D22,26 RF SW VHF TX
D27 SW VHF TX
D28 SW UHF TX
Ref. No. Use / Function
Operation/Condition/Compatibility

1-18 (No.RA044<Rev.001>)
2.3 TERMINAL FUNCTION
2.3.1 TX-RX UNIT (XC1-138)(1/7) CONTROL
D29,30 SW TX AMP on/off
D31 RF SW UHF TX
D32,35 RF SW VHF TX
D33,36 RF SW UHF TX
D38 RF SW Local A-band
D39 Reverse current
protector
D40,41 SW ATT switch
D42,43 SW UHF TX
D44 Surge protection
D45 RF SW VHF TX
D171,172 BPF tuning UHF RX A-band
D173 RF SW UHF RX A-band
D175 SW UHF RX
D177,178 BPF tuning UHF RX B-band
D179 RF SW UHF RX B-band
D180 RF SW VHF RX
D181 RF SW 220M RX
D182,184 BPF tuning VHF RX A-band
D185 RF SW VHF RX A-band
D186 SW VHF RX
D188,189,
191
BPF tuning VHF RX B-band
D192 RF SW VHF RX B-band
D193 RF SW UHF RX
D194,195 Bar ANT tuning AM radio
D196 SW Bar ANT
D197 RF SW HF RX B-band
D198 RF SW Bar ANT
D199 RF SW HF B-band
D200 RF SW Bar ANT(MW)
D201 RF SW HF B-band
D202 Bar ANT tuning AM radio
D204 RF SW HF B-band
D361 RF SW B-band RX Local
D362,363 RF SW B-band Fin
D364,365 RF SW B-band Local
D366 Modulator B-band VCO2
D367 Modulator B-band VCO1
D369,372 Frequency
Control
B-band VCO2
D370,373 Frequency
Control
B-band VCO1
D374 RF SW B-band VCO2 Shift
D375 RF SW B-band VCO1 Shift
D376 Speed up Ripple filter
D378 RF SW Local A-band
Ref. No. Use / Function
Operation/Condition/Compatibility
D379 Speed up Ripple filter
D380 Modulator A-band VCO Shift
D381 Modulator A-band VCO
D382 Frequency
Control
A-band VCO
D383 RF SW Local B-band
D576 Reverse Voltage
Protection
Battery
D577 Reverse Voltage
Protection
DC-IN
D578 OR Circuit 3.1V Power Supply
D579,580,
583
Over Voltage
Protection
Power ON Logic for DC IN or
Battery Insert
D587 Surge protection 8.4V DC/DC with Battery Charger
D588 Speed up 8.4V DC/DC with Battery Charger
D673,674 BPF tuning FM radio
D675,700 Voltage protector Constant voltage
D710 Reverse current
protector
D720 SW Bus switch power on/off
D721 LED TX/busy
D801~812 LED Back Light
D882,883 VOX Current steering
Pin No. Name I/O Function
CN702( to LCD Module)
1 LEDK3 I LED cathode 3
2 LEDK2 I LED cathode 2
3 LEDK1 I LED cathode 1
4 LEDA O 40C power supply(LED anode)
5 VSSA - Analog GND
6 VSSA - Analog GND
7 VCC O 3V power supply
8 VCC O 3V power supply
9 DC O LCD driver data/command
switching signal
10 /CS O LCD driver CS signal
11 /RESET O LCD driver RESET signal
12 /RD O LCD driver RD signal
13 /WR O LCD driver WR signal
14 IMO O Interface mode select
15 BD15 I/O LCD driver bus data output
16 BD14 I/O LCD driver bus data output
17 BD13 I/O LCD driver bus data output
18 BD12 I/O LCD driver bus data output
Ref. No. Use / Function
Operation/Condition/Compatibility

(No.RA044<Rev.001>)1-19
19 BD11 I/O LCD driver bus data output
20 BD10 I/O LCD driver bus data output
21 BD09 I/O LCD driver bus data output
22 BD08 I/O LCD driver bus data output
23 BD07 I/O LCD driver bus data output
24 BD06 I/O LCD driver bus data output
25 BD05 I/O LCD driver bus data output
26 BD04 I/O LCD driver bus data output
27 BD03 I/O LCD driver bus data output
28 BD02 I/O LCD driver bus data output
29 BD01 I/O LCD driver bus data output
30 BD00 I/O LCD driver bus data output
31 CABC - NC
32 IOVCC O 1.8V power supply
33 IOVCC O 1.8V power supply
34 VSSD - digital GND
35 VSSD - digital GND
CN705(to KEY)
1 LAMP B O LAMP B
2NC -NC
3 LAMP GND - LAMP GND
4 SP- I SP GND
5 SP+ O SP AF
6 LAMP GND - LAMP GND
7 KEY_I0 I key matrix
8 KEY_I1 I key matrix
9 KEY_I2 I key matrix
10 KEY_I3 I key matrix
11 KEY_I4 I key matrix
12 KEY_O0 O key matrix
13 KEY_O1 O key matrix
14 KEY_O2 O key matrix
15 KEY_O3 O key matrix
16 KEY_O4 O key matrix
CN706(to TX-RX)
1 +B I +B power supply
2 DET1 I power detect signal
3 +B I +B power supply
4DET2 -Nouse
5 TCXO VCOM O Modulation signal for TCXO
6 CURR I Final current detection voltage
7 40C I 40C power supply
8 SQA I Band A squelch voltage signal
9 40C I 40C power supply
10 GND - GND
11 RAINT O Interrupt signal for radio
Pin No. Name I/O Function
12 BPFA O Band A BPF adjustment signal
13 47C I 47C power supply
14 AFA I Band A audio signal
15 AGCB O Band B AGC signal
16 SMA I Band A RSSI voltage signal
17 IFB I Band B SSB/CW/AM/IF signal
18 LDA I Band A lock detect signal
19 AFB_FM I Band B D-star/FM audio signal
20 PRHOTB I Processor hot signal
21 SQB I Band B squelch voltage signal
22 PMO I Voltage output signal for charge
23 SMB I Band B RSSI voltage signal
24 LDB I Band B lock detect signal
25 I2CCK O I2C CLK signal for charge IC
26 /RST_R I RESET signal for radio IC
27 I2CDT I/O I2C DATA signal for charge IC
28 GND - GND
29 I2CCKR I I2C CLK signal for radio IC
30 GND - GND
31 I2CDTR I/O I2C DATA signal for radio IC
32 GND - GND
33 SCPU_TXD O UART for SUB MPU
34 BFMS I Band B switch signal for
power supply(76-108MHz)
35 SCPU_RXD I UART for SUB MPU
36 VINOK I VINOK signal
37 /S_RST O RESET signal for SUB MPU
38 BAT_DET I Battery S terminal detect signal
39 40CS O 40C switch signal
40 VDCIN I Detection signal for
DC IN voltage
41 33SS O 33S switch signal
42 POSWO O Power switch output signal
43 Freq I TCXO Frequency
adjustment signal
44 AGCA/APC O Band A AGC signal
& APC signal
45 VCOMOD O Modulation signal for VCO
46 VBAT I Battery voltage detect signal
47 BPFB O Band B BPF adjustment signal
48 NC - NC
49 33RAD I 33RAD power supply
50 +B1 I +B power supply
CN707(to encoder)
1GND -GND
2 Vol_O O Volume signal
3 Vol_I I Power supply for volume
Pin No. Name I/O Function

1-20 (No.RA044<Rev.001>)
2.3.2 TX-RX UNIT (XC1-138)(2/7) TX-RX
4 ENC2 I Encoder data 2
5 GND - GND
6 ENC1 I Encoder data 1
Pin No. Name I/O Function
CN182(to MW/SW)
1 BFMS O Band B switch signal for
power supply(76-108MHz)
2 FMOUT I FM Radio RF signal
3 SWANT_S O SW bar antenna on/off switch signal
4 GND - GND
5 GND - GND
6 HFIN O Band B HF RF signal
7 MWANT_S O MW bar antenna on/off switch signal
8 GND - GND
9 GND - GND
10 BHFS O Band B switch signal for power
supply(0.1-76MHz)
11 OBPFB O Band B BPF adjustment signal
12 GND - GND
13 GND - GND
14 HFOUT I Band B HF RF signal
15 OAGCB O Band B AGC signal
16 GND - GND
17 GND - GND
18 GND - GND
19 47C O 47C power supply
20 47C O 47C power supply
CN401(to VCO B)
1 VCO2 O Band B switch signal for power
supply(VCO2)
2 CV_B O Band B lock voltage
3 33BF O Band B VCO Power supply
4 GND - GND
5 UCW_VCO - NC
6 GND - GND
7 VCO1 O Band B switch signal for power
supply(VCO1)
8 GND - GND
9 SHIFT_B O Band B VCO shift signal
10 VCO_MOD O Modulation signal for VCO
11 GND - GND
12 GND - GND
13 GND - GND
14 NC - NC
15 GND - GND
16 VCO_B I Band B VCO signal
Pin No. Name I/O Function
CN501(to VCO A)
1 VCO_A I Band A VCO signal
2 Fin_A O Band A PLL RF input signal
3 GND - GND
4 GND - GND
5 GND - GND
6 GND - GND
7 GND - GND
8NC -NC
9 33CA O 33CA power supply
10 GND - GND
11 GND - GND
12 GND - GND
13 GND - GND
14 GND - GND
15 SHIFT_A O Band A VCO shift signal
16 CV_A O Band A lock voltage
CN661(to CONTROL)
1 +B O +B power supply
2 DET1 O power detect signal
3 +B O +B power supply
4DET2 -NC
5 TCXO VCOM I Modulation signal for TCXO
6 CURR O Final current detection voltage
7 40C O 40C power supply
8 SQA O Band A squelch voltage signal
9 40C O 40C power supply
10 GND - GND
11 RAINT I Interrupt signal for radio
12 BPFA I Band A BPF adjustment signal
13 47C O 47C power supply
14 AFA O Band A audio signal
15 AGCB I Band B AGC signal
16 SMA O Band A RSSI voltage signal
17 IFB O Band B SSB/CW/AM/IF signal
18 LDA O Band A lock detect signal
19 AFB_FM O Band B D-star/FM audio signal
20 PRHOTB O Processor hot signal
21 SQB O Band B squelch voltage signal
22 PMO O Voltage output signal for charge
23 SMB O Band B RSSI voltage signal
24 LDB O Band B lock detect signal
25 I2CCK I I2C CLK signal for charge IC
26 /RST_R O RESET signal for radio IC
27 I2CDT I/O I2C DATA signal for charge IC
28 GND - GND
Pin No. Name I/O Function