JETStream JT220M User manual

JT220M
SPECIFICATIONS
General
Frequency Range
RX 216~280MHz
TX 222~225MHz
Number of channels 100
Operation mode FM 16K0F3E (Wide mode)/8K50F3E (Narrow mode)
Channel Stepping 5, 8.33, 10, 12.5, 15, 20, 25, 30, 50KHz
Antenna Impedance 50Ω
Working temperature –10℃~+60℃(–14℉~+140℉)
Power Supply 13.8V DC±15% (11.7~15.8V)
Grounding Method Negative ground
Current Transmitter: about 9.0A
Receiver: about 600mA(max.) 400mA (noise reductions)
Frequency Stability ±2.5ppm
Dimensions (W x H x D ) 145 x 47 x 190 mm
Weight Approx. 1.2kg / 2.6lb
RECEIVER
Circuitry Double conversion superheterodyne
Intermediate Frequency (1st / 2nd) 38.85MHz / 450kHz
Sensitivity (12dB SINAD) Wide : 0.25μV or less Narrow : 0.35μV or less
Selectivity
–6dB Wide : 12kHz or more Narrow : 6kHz or more
–60dB Wide : 28kHz or less Narrow : 14kHz or less
Squelch Sensitivity 0.1μV
Audio Output (8Ω, 10% distortion) 2.0W
TRANSMITTER
Power Output
High 50W
Mid 10W
Low About 5W
Modulation Changeable impedance
Scattering transmit -60dB or less than-60dB
Maximum Frequency Deviation Wide :±5kHz, Narrow :±2.5kHz
Impedance of Microphone 2KΩ

JT220M
BLOCK DIAGRAM
LPF
D231
LPF
MA742
ANT
POW DET POW DET
ANT SW
Q206
RF AMP BPF
3SK318
BPF
RF BPF
VFM
D230
MA742
APC
Q216
FINAL
MRF7042
AMPAMP
DRIVE
Q214
RD07
PRE
AMP
DRIVE
Q212
2SK3078
AMP
RF
Q220
2SC3357
8T8T
T/R SW
Q205
MIX
3SK318
VFM
D210,D211
D204
DAN235E
CONTROL U204
LM2904V
L407CDB
TUNE RF BPF
TUNE
D207,D208
HVC350
D205,D206
HVC350 D/A
DC AMPVIF
U202
LM2904V(1/2)
U505
M62364F(5/8)
CONV
VG
PC
TV 8T
8R8T
D203
DAN235E
RF
Q207
2SC4226
8C
BUFF
Q209
2SC4226
VCO
RX
Q217
2SK1875
VCO
Q219
SW SW
P45
Q201
UMC4N
2SJ243
TX
Q218
2SK1875
VCO
MOD
MCF
XF200,XF201
38.85MHz
IF AMP
Q204
2SC4215
DEMODULATOR
Q200
IF
U505
M62364F(6/8)
NOISE
Q213
CHARGE
DTA114EE
P23
U202
LM2904V(2/2)
LIPPLE
Q221
2SC1623
FILTER
8C
LOOP
FILTER
RF
Q210
2SC4226
U2
S3P8249
SW
Q100
2SB1386
SW
Q103
DTC114EU
P13
AVR
U1
HT7550-1
RESET U5
S7133SF
5M
RESET
AVR
U100
MC7808
SBE
8C
SW
Q102
2SB1132
SW
Q104
DTC114EU
P47
E
+B8T
SW
Q101
2SB624
SW
Q108
DTC114EE
P41
8R
AVR U101
MC78L05
5C 5C
P02
SW
SW
SW
VAM VFM
Q105
DTC114EE
P46
Q106
UMC4N
Q107
UMC4N
8C
U500
MC33111 EEPROM
U6
AT24C32RM
EEPCK
EESDT
5M
P03
P00
P15
POWER
FUNC
V/M
MHz TSQ CALL
SQL
P52
P56
P57
SW
VIF
U201
MC78L05
VCO
P21
P22
J2
PHONEJACK SP
EXT.
SP
J502
STEREO
.
D/A
CONV
U505
M62364F(4/8)
TX: 222.000-225.000
RX: 216.000-280.000
Q211
2SC4215
AF/SQ P24
MULTIPLY
X2
PLL IC
TCXO
8C
5C
X200
P53
P51
P50
P07
5C
D/A
U505
M62364F(3/8)
CONV
CTCSS
D/A
CONV
U505
M62364F(1/8)
U205
LMX1511
CHARGE
PUMP
CHARGE
PUMP
Q223
2SA1832(GR)
Q224
2SC4738(GR)
19.200MHz
19.200MHz
D/A
U505
M62364F(7/8)(8/8)
CONV SW
Q500
DTC144EE
P43
COMPANDER
U500
MC33111
(B/2)
5C P42
HPF
U502
NJM2902
VB
LPF
U501
NJM2902(2/4)
BUFFER
U501
NJM2902(1/4)
AMP
TONE
LPF
U503
NJM2902
5C
CTCSS/DCS
AF/SQ DTMF-DET RX-A
AF PA
U506
LA4600
SBE
(NARROW)
CF200 SW
WIDE
SW
SW
8R
D201
DAN235E
D200
DAN235E
P44
UMC4N(WIDE)
CF201
NARROW SW
Q203
DTA114YE
VIF
U200
TA31136FN
BUFFER
AMP
U501
LM2902(4/4)
U505
M62364F(6/8) D/A
CONV
REFERENCE
VOLTAGE
U501
NJM2902(3/4)
5C
P10
P11
SW
Y2
7.3728MHz
Q4
DTC144EE
SHIFT
DTMF
U4
HT9200A
CS,CK,DT
Y1
3.58MHz
5M
CS,WR,DT
P12
P13
P15
P16
P00
P01
P04
P07
P21
P23
P24
P25
P27
P40
P42
P43
P44
P45
P46
P47
P50
P51
P53
P54
P41
P22 W1
10K
ENCODER
CTCSS/DCS
BUFFER
AMP U8
LM2904V
BEEP SW
SIN
5M
TONE
P27
CTCSS
DTMF-DET
U7
TC4W53FU
D/A
U505
M62364F(2/8)
CONV
U504
NJM2902(1/4)
Q502
AGC
2SC4181
SW AGC
U504
NJM2902(3/4)(4/4)
P40
DET
D502
DAN222
D501
1SS372
COMPANDER U500
MC33111
(A/2)
P40 TONEP16
U504
NJM2902(2/4) MIC/IDC
SPLATTER
FILTER
SW
AMP
Q5
2SC1623
U3
HT1621M
COM0~7
SEG0~27 LCD DRIVE
Q1
DTC114EE
SW
SW
P27
P12
5C
Q2
DTC114EE
5M
LCD BACK LIGHT
D5
Q6 2SC1623
Q7 2SD468
5M LCD
SW P47
D3
POW LED
D9
TX LED
MIC
P01
P10
P11
5C
P00
MICG
P04
MIC
HAND MIC INTERFACE
J501
PHONE-DC
Q3
DTC144EE
.
TX-A
BUFFER
AMP
REPEATER INTERFACE
5C
P01
RX-A
P42
TX-A
J503
8C

JT220M
1
CIRCUIT DESCRIPTION
Frequency configuration
The receiver utilizes double conversion. The first IF is 38.850 MHz 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.
Fig. 1 Frequency configuration
Receiver
The receiver is double conversion super heterodyne, designed to operate in the frequency range of 216
to 280MHz.
The frequency configuration is shown in Fig. 1.
Front - end RF amplifier
An incoming signal from the antenna is applied to an RF amplifier (Q206) after passing through a
transmit/receive switch circuit (D210 are off) and a band pass filter (L206, L207 and varactor diodes: D207,
D208). After the signal is amplified (Q206), the signal is filtered through a band pass filter (L205, L206 and
varactor diodes: D205, D206) to eliminate unwanted signals before it is passed to the first mixer.
The voltage of these diodes are controlled by tracking the D/A (U505) center frequency of the band
pass filter. (See Fig. 2.)
Fig. 2 Receiver section configuration
ANT SW
MCF
38.850MHz
IF SYSTEM
450KHz
CF
ANT
AF
AMP SP
TCXO 19.200MHz
POWER
AMP RF
AMP
PLL
VCO
MIC
MIC
AMP
RX
TX
1st
MIX
RF
AMP
1/2
X2 MULTIPLY
38.4MHz
Q200
RX: 216.000-280.000
TX: 222.000-225.000
ANT SW IF system
(PLL)
CF201(wide)
ANT
1st Local OSC
BUFFER AMP
U501(4/4)
U200
IF AMP
Q204
MCF
XF200, XF201
MIXER
Q205
BPF
RF AMP
Q206
BPF
D210,D211
U505
D/A
TV
CPU
CF200(Narrow) D/A CONVERTER
U505
W/NO
D207, D208
L206, L207 D205,D206
L205, L206
X2 MULTIPLY
Q211
TCXO
X200

JT220M
2
CIRCUIT DESCRIPTION
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 (Q205) to create a 38.850MHz first intermediate frequency
(1st IF) signal. The first IF signal is then fed through one pair of monolithic crystal filter (MCF : XF200 and
XF201) to further remove spurious signals.
IF amplifier
The first IF signal is amplified by Q204, and then goes to U200 (FM processing IC). The signal is
heterodyned again with a second local oscillator signal within U200 to create a 450kHz second IF signal.
The second IF signal is then fed through a 450kHz ceramic filter (Wide : CF201, Narrow : CF200) to
further eliminate unwanted signals before it is amplified and FM detected in U200.
Wide/Narrow Switching Circuit
The Wide port and Narrow port (pin 75) of the CPU is used to switch between ceramic filters. When the
Wide port is high, the ceramic filter SW diodes (D200, D201) cause CF201 to turn on to receive a Wide
signal.
When the Narrow port is low, the ceramic filter SW diodes (D200, D201) cause CF200 to turn on to
receive a Narrow signal. (See Fig. 3.)
Fig. 3 Wide/Narrow Switching Circuit
AF Signal System
The detection signal from IF IC (U200) goes to D/A converter (U505) for adjusting the gain and is output
to AF filter (U502) for characterizing the signal. It is also amplified by entering compander amplifier (U500).
The AF signal output from U500 and the TONE signal are summed up and the resulting signal goes to the
D/A converter (U505). The AFO output level is adjusted by the D/A converter. The signal output from the
D/A converter is input to the audio power amplifier (U506). The AF signal from U505 was inputted into
(U506).The AF signal from (U506) switches between the internal speaker and speaker jack (J502) output.
(See Fig. 4.)
Fig. 4 AF signal system
U501, U502
AF Filter
U505
D/A
CONV.
U200
IF IC
U505
D/A
CONV. AF PA
U506
SP
U500
COMPANDE
IF_IN
U200
IF SYSTEM
MIX_O
D201 D200
CF200
(NARROW)
CF201
(WIDE)
R205
R206
SW
SW
Q203
Q200
WIDE/NARROW SW
U2 75pin
.
R207
R208

JT220M
3
CIRCUIT DESCRIPTION
Squelch Circuit
The detection output from the FM IF IC (U200) passes through a noise amplifier (U201 2/2) to detect
noise. A voltage is applied to the CPU (U2). The CPU controls squelch according to the voltage (SQIN)
level. The signal from the RSSI pin of U200 is used for S-meter. The electric field strength of the receive
signal can be known before the SQIN voltage is input to the CPU, and the scan stop speed is improved.
Fig. 5 Squelch Circuit
PLL frequency synthesizer
The PLL circuit generates the first local oscillator signal for reception and the RF signal for transmission.
PLL
The frequency step of the PLL circuit is 5 or 6.25kHz. A 19.200MHz reference oscillator signal is divided
at U205 by a fixed counter to produce the 5 or 6.25kHz reference frequency. The voltage controlled
oscillator (VCO) output signal is buffer amplified by Q209, then divided in U205 by a dualmodule
programmable counter. The divided signal is compared in phase with the 5 or 6.25kHz reference signal in
the phase comparator in U205. 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. 6.)
VCO
The operating frequency is generated by Q218 in transmit mode and Q217 in receive mode. The
oscillator frequency is controlled by applying the VCO control voltage, obtained from the phase
comparator, to the varactor diodes (D219 and D223 in transmit mode and D217 and D220 in receive
mode). The TX/RX pin is set high in receive mode causing Q201 and Q219 to turn Q218 off, and turn
Q217 on. The TX/RX pin is set low in transmit mode. The outputs from Q217 and Q218 are amplified by
Q209 and sent to the RF amplifiers. (See Fig. 6.)
Fig. 6 PLL circuit
UNLOCK Circuit
During reception, the RXC signal goes high, the TXC signal goes low, and Q108 turns on. Q101 turns
on and a voltage is applied to (8R). During transmission, the RXC signal goes low, the TXC signal goes
U200
SYSTEM CPU
U2
NOISE AMP
U201
IF
SQ
RSSI
SQIN
RSSI
COMPARATOR
PHASE CHARGE
PUMP
U205:PLL IC
REF OSC
I/N
I/M
PLL DATA LPF
Q210
TX VCO
Q218
BUFF AMP
Q209
19.200MHz
Q201,Q219
T/R SW
.
RX VCO
Q217
RF amplifiers
AMP
P45 (CPU)
D219,D223
D217,D220
5KHz/6.25KHz
5KHz/6.25KHz

JT220M
4
CIRCUIT DESCRIPTION
high and Q104 turns on. Q102 turns on and a voltage is applied to (8T).
The CPU in the control unit monitors the PLL (U205) LD signal directly. When the PLL is unlocked
during transmission, the PLL LD signal goes low. The CPU detects this signal and makes the TXC signal
low. When the TXC signal goes low, no voltage is applied to 8T, and no signal is transmitted. (See Fig. 7.)
Fig. 7 Unlock circuit
Transmitter
Outline
The transmitter circuit produces and amplifies the desired frequency directly. It FM-modulates the
carrier signal by means of a varicap diode.
Power Amplifier Circuit
The transmit output signal from the VCO passes through the transmission/reception selection diode
(D203) and amplified by Q220, Q212 and Q214. The amplified signal goes to the final amplifier (Q216)
through a low-pass filter. The low-pass filter removes unwanted high-frequency harmonic components,
and the resulting signal is transmitted through the antenna terminal. (See Fig. 8.)
Fig. 8 Transmitter system
APC Circuit
The automatic transmission power control (APC) circuit detects part of a final amplifier output with a
diode (D230, D231) and applies a voltage to U202. U202 compares the APC control voltage (PC)
generated by the D/A converter (U505) with the detection output voltage. U202 generates the voltage to
control Q214 and Q216 and stabilizes transmission output.
The APC circuit is configured to protect over current of Q214 and Q216 due to fluctuations of the load
SW
Q101 SW
Q102
SW
Q108 SW
Q104
U2 U205
CPU PLL
LD
RXC
8C
PLL lock
:LD"H"
TXC
8R 8T
.
D/A
U505
M62364F
CONVERTER
U504
COMPANDER
AMP
Q5
2SC1623
U500 U504
MIC/IDC
U504
SPLATTER
FILTER
U505
VCO
Q218
2SK508
NJM2902 MC33111 NJM2902
NJM2902
D/A
M62364F
CONVERTER BUFFER
Q209
2SC4226 Q207
Q207
2SC4226
X200
192.0MHz
TCXO PLL
U205
LMX1511TM RF AMP
Q210
2SC4226
RF AMP
Q220
2SC3357 DRIVE STAGE
Q212
2SK3078A DRIVE AMP
Q214
RD07 FINAL AMP
Q216
MRF7042
ANT
MIC
BUFFER

JT220M
5
CIRCUIT DESCRIPTION
at the antenna end and to stabilize transmission output at voltage and temperature variations. (See Fig.
9.)
Fig. 9 APC Circuit
Control Circuit
The CPU carries out the following tasks (See Fig. 10.):
1) Controls the WIDE, NARROW, TX/RX outputs.
2) Controls the display unit.
3) Controls the PLL (U205).
4) Controls the D/A converter (U505) and adjusts the volume, modulation and transmission power.
Fig. 10 Control circuit
Memory Circuit
The transceiver has an 64k-bit EEPROM (U6). The EEPROM contains adjustment data. The CPU (U2)
controls the EEPROM through two serial data lines. (See Fig. 11.)
Fig. 11 APC Circuit
Display Circuit
The CPU (U2) controls the display LCD and LEDs. When power is on, the CPU will use the P12 line to
control the LCD illumination backlight LEDs.
The brightness function is controlled by the switch Q6 and Q7.
The LCD driver (U3) and CPU (U2) communicate through the CS, WR, DI, lines. (See Fig. 12.)
CK
D/A
DT
LD
LE
U505
converter
U205
PLL
U2
CPU
U6
EEPROM
U2
CPU
RF AMP
Q220
DRIVE STAGE
Q212
DRIVE AMP
Q214
FINAL AMP
Q216
ANT
ANT SW LPF
POWER
DET
D230,D231
APC
CONTROL
VR200
U204
14pin
U505
PC
D210,D211
D203

JT220M
6
CPU
CS
U2 LCD
U3 LCD
COM0~COM3
SEG0~SEG27
driver
WR
DI
Q6,Q7
SW 8C
D5
P12
BLUE
CIRCUIT DESCRIPTION
Fig. 12 Display circuit
Encode
The CTCSS and DCS signal that is output from CPU(U2) of P31 pass through two-way digital switches
and buffer amplifier(U8A) to amplify. The DTMF signal that is output from DTMF encoder passes through
buffer amplifier (U8A) to amplify, and amplified by the other U504 (B/4) to perform IDC operation. The
signal then passes through a low-pass filter (splatter filter) U504 (C/4and D/4) and cuts 3kHz and higher
frequencies. and the resulting signal goes to the D/Aconverter (U505).
The D/A converter (U505) adjusts the balance between the MOD and CTCSS/DCS levels. Signal of
CTCSS/DCS port is summed with MOD and the resulting signal goes to the VCO. This signal is applied to
a varicap diode in the VCO for direct FM modulation. (See Fig. 13.)
Fig. 13 Encode circuit
Decode
CTCSS/DCS/ DTMF
The signal from (AFWN) entering into AF signal and higher audio frequencies output by pin 1 of U501:A
are cut by low-pass filter U503 and amplified. then led to pin 42 of CPU. The input signal is compared with
the programmed tone frequency code in the CPU. The squelch will open when they match.
The signal (DTMF-DET) goes to P27 (pin 43) of CPU (U2). The DTMF input signal from the DTMF-DET
goes to compared U8B. The compared signal goes to the CPU for processing and be decoded within the
CPU (U2). (See Fig. 14.)
Fig. 14 Decode circuit
2-CHANNEL
DIGITAL SW
D/A
U505
U2
CPU
VCO
X200
TCXO U205
PLL
DTMF
DCS/CTCSS
U4
DTMF
Encode
BUFFER
AMP
U8A
U7 TCXO
MOD
VCO MOD
AFWN LPF
CPU
U503
U2
FILTER
BUFFER AMP
U501D
U8B
COMPARATOR
U501B/U502
LPF/HPF
FILTER
DTMF-DET

JT220M
7
CIRCUIT DESCRIPTION
D/A Converter
The D/A converter (U505) is used to adjust MO modulation, AF volume, TV voltage, FC reference
voltage, and PC POWER CONTROL voltage level.
Adjustment values are sent from the CPU as serial data. The D/A converter has a resolution of 256 and
the following relationship is valid.
Power Supply Circuit
When the POWER switch on the display unit is pressed, the power port on the display unit which is
connected to CPU port 25 (POWER), goes low, then CPU port 31 (P13) goes high, Q103 turns on, SBE
SW (Q100) turns on and power (SBE) is supplied to the radio.
When the DC power supplied to the radio, the voltage regulator IC (U1) supply into the CPU VDD and
reset voltage detect IC (U5). U5 will generate signal (RESET) in to the reset terminal on the CPU (U2) to
carry out a power ON reset.
During receiving, the CPU port 72 (P41) output "H" level. Q101 and Q108 turn on. and reception circuit
is supplied by 8V power supply (8R).
When the receiving is at FM, the CUP port 77 (P46) output "L" level. Q106 turns on and supplies 8V
power supply to FM reception circuit (VFM).
During transmitting, CPU port 78 (P47) output "H" level. Q102 and Q104 turn on. Transmitting circuit
output 8V power supply (8T). (See Fig. 15.)
Fig. 15 Power supply circuit
U2 5M
CPU
Q100
SW
Q103
SW
U1
AVR
U5
RST
Q101
SW
Q108
SW
Q106
SW
VAM VFM Q102
SW
Q104
SW
Q107
SW
Q105
SW
8R
8T
U100
AVR
U101
AVR
5C
8C
RESET
P13
P46
P41
P47
FB
POWER SW
POWER

JT220M
1
ADJUSTMENT
PCB Section
Item Condition Measurement Adjustment Specifications
/Remarks
Test equipment Terminal Parts Method
1. Setting 1) Power supply voltage
DC Power supply terminal : 13.8V
2. VCO lock
voltage
1) CH: TX high Digital voltmeter TC2 CV201 3.3 V ±0.5V
2) CH: RX high CV200 3.3 V ±0.5V
3) CH: TX low Check More than 0.6V
4) CH: RX low
Transmitter section
Item Condition Measurement Adjustment Specifications
/Remarks
Test equipment Terminal Parts Method
1. Frequency 1) CH: TX center
2) Transmit
Frequency counter ANT Encoder
knob
Adjust to the frequency Within ±200Hz
2. Maximum
power
alignment
1) CH : TX high
2) Adjustment HEX value : FF
3) Transmit
Power meter VR200 55W
3. High
power
1) CH : TX low
CH : TX low’
CH : TX center
CH : TX high’
CH : TX high
2) Transmit
Encoder
knob
50W ±5.0W
4. Mid
power
1) CH : TX low
CH : TX low’
CH : TX center
CH : TX high’
CH : TX high
2) Transmit
10W ±2W
5. Low
power
1) CH : TX low
CH : TX low’
CH : TX center
CH : TX high’
CH : TX high
2) Transmit
5W ±1W
6. DCS
balance
1) CH : TX center
2) Transmit
Modulation analyzer
or Linear detector
(LPF : 3kHz)
Oscilloscope
Adjust the waveform as
below
7.Max
deviation
1) CH : TX low (Wide)
CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) AG : 1kHz/120mV
3) Transmit
Modulation
analyzer or linear
detector
(LPF15kHz)
Oscilloscope
AG
AF. V. M
ANT
MIC
±4.3kHz (Wide)
±2.1kHz (Narrow)
According to the large +,
–
±200Hz
±100Hz

JT220M
2
ADJUSTMENT
Transmitter section
Item Condition Measurement Adjustment Specifications
/Remarks
Test equipment Terminal Parts Method
8. MIC
sensitivity
1) CH : TX center (Narrow)
2) AG : 1kHz/4mV
3) Transmit
Modulation
analyzer or linear
detector
(LPF15kHz)
Oscilloscope
AG
AF. V. M
ANT
MIC
Check ±1.7~2.0kHz
(Narrow)
9. CTCSS
fine
deviation
1) CH : TX low (Wide)
CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) Transmit
Modulation analyzer
or Linear detector
(LPF : 3kHz)
Oscilloscope
Encoder
Knob
±0.7kHz (Wide)
±0.4kHz (Narrow)
±200Hz
±100Hz
10. DCS fine
deviation
1) CH : TX low (Wide)
CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) Transmit
±0.8kHz (Wide)
±0.4kHz (Narrow)
±200Hz
±100Hz
11. DTMF
deviation
1) CH : TX center (Wide/Narrow)
2) Transmit
±3.0 kHz (Wide)
±1.5kHz (Narrow)
±100Hz
Receiver Section
Item Condition Measurement Adjustment Specifications
/Remarks
Test equipment Terminal Parts Method
1. Sensitivity 1) CH : RX low (Wide/Narrow)
CH : RX center (Wide/Narrow)
CH : RX high (Wide/Narrow)
2) SSG output:
: –119dBm (0.25μV) (Wide)
: –116dBm (0.35μV) (Narrow)
Mod : 1kHz
Dev : ±3.0kHz (Wide)
Dev : ±1.5kHz (Narrow)
SSG
Oscilloscope
AF V.M
Distortion meter
ANT
EXT. SP
Check SINAD:
12dB or higher
2. Squelch 20 1) CH : TX low (Wide)
CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) SSG output:
: –116dBm (0.35μV) (Wide)
: –114dBm (0.44μV) (Narrow)
Mod : 1kHz
Dev : ±3.0kHz (Wide)
Dev : ±1.5kHz (Narrow)
Encoder
knob
Adjust to open the
squelch
3. Squelch 1 1) CH : TX low (Wide)
CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) SSG output:
: –127dBm (0.1μV) (Wide)
: –123dBm (0.16μV) (Narrow)
Mod : 1kHz
Dev : ±3.0kHz (Wide)
Dev : ±1.5kHz (Narrow)

JT220M
1
PARTS LIST
DISPLAY UNIT
Ref. No Parts No. Description of item Size (LxW)(mm) Qty Specification
C1-C6 SMT CAPACITOR 0603 6 104±10% 50V
C7-C20 SMT CAPACITOR 0603 14 102±10% 50V
C21-C30 SMT CAPACITOR 0603 10 103±10% 50V
C31-C32 SMT CAPACITOR 0603 2 105±10% 50V
C33-C34 SMT CAPACITOR 0603 2 473±10% 50V
C35-C36 SMT CAPACITOR 0603 2 273±10% 50V
C37 SMT CAPACITOR 1206 1 225±10% 50V
C38 SMT CAPACITOR 0603 1 103±10% 50V
C39-C40 SMT CAPACITOR 0603 2 22P±5% 50V
C41 SMT CAPACITOR 0603 1 120P±5% 50V
C42-C43 SMT CAPACITOR 0603 2 20P±5% 50V
C44 SMT CAPACITOR 0603 1 473±10% 50V
C46 SMT CAPACITOR 0603 1 182P±10% 50V
C47-C48 SMT CAPACITOR 0603 2 NOUSE
C49 SMT CAPACITOR 0603 1 225±10% 50V
C50 SMT CAPACITOR 0603 1 104±10% 50V
C51 SMT CAPACITOR 0603 1 10P±5% 50V
E1 ELECTRO 4×8 1 22uF25V
E2-E4 ELECTRO 4×8 3 47uF/10V
R1 SMT RESISTOR 0603 1 1K±5%
R2 SMT RESISTOR 0603 1 22K±5%
R3-R7 SMT RESISTOR 0603 4 1K±5%
R8 SMT RESISTOR 0603 1 24K±5%
R9-R16 SMT RESISTOR 0603 8 1K±5%
R17 SMT RESISTOR 0603 1 33K±5%
R18 SMT RESISTOR 0603 1 2.2K±5%
R20 SMT RESISTOR 0603 1 1K±5%

JT220M
2
PARTS LIST
Ref. No Parts No. Description of item Size (LxW)(mm) Qty Specification
R21 SMT RESISTOR 0603 1 51K±5%
R22 SMT RESISTOR 0603 1 33K±5%
R27-R35 SMT RESISTOR 0603 9 10K±5%
R36 SMT RESISTOR 0603 1 220K±5%
R37-R46 SMT RESISTOR 0603 10 47K±5%
R47-R48 SMT RESISTOR 0603 2 12K±5%
R49-R51 SMT RESISTOR 0603 3 470R±5%
R53 SMT RESISTOR 0603 1 220R±5%
R54 SMT RESISTOR 0603 1 100R±5%
R55 SMT RESISTOR 0603 1 470R±5%
R56 SMT RESISTOR 0603 1 4.7K±5%
R57 SMT RESISTOR 0603 1 2.2K±5%
R58 SMT RESISTOR 0603 1 4.7K±5%
R59 SMT RESISTOR 0603 1 470K±5%
R60 SMT RESISTOR 0603 1 22K±5%
R61 SMT RESISTOR 0603 1 56K±5%
R62 SMT RESISTOR 0603 1 33K±5%
R63-R64 SMT RESISTOR 0805 2 56R±5%
R65 SMT RESISTOR 0603 1 1K±5%
R66 SMT RESISTOR 0603 1 8.2K
R67 SMT RESISTOR 0603 1 39K
R68-R70 SMT RESISTOR 0603 3 100K±5%
R71 SMT RESISTOR 0603 1 24K±5%
D1-D2 SMT ZENER DIODE 0805 2 5V1
D5 LCD BACK LIGHT 1 BLUE
D3/D9 SMT LIGHTED DIODE 0603 2 ORANGE
D10-D14 SMT DIODE SOT-323 5 DA221
DS1 LCD 1 GDH-706W

JT220M
3
PARTS LIST
Ref. No Parts No. Description of item Size (LxW)(mm) Qty Specification
Q1-Q2 SMT DIGITAL TRANSISTOR EMT3 2 DTC114EE
Q3-Q4 SMT DIGITAL TRANSISTOR EMT3 2 DTC144EE
Q5-Q6 SMT TRANSISTOR SOT-23 2 2SC1623
Q7 TRANSISTOR TO-92 1 2SD468
U1 SMT IC TO-92 1 HT7550-1
U2 SMT IC QFP80 1 S3P8249
U3 SMT IC MSK48 1 HT1621M
U4 SMT IC SOP-8 1 HT9200A
U5 SMT IC SOT-23 1 S7133SF
U6 SMT IC SOP-8 1 AT24C64RM(8)
U7 SMT IC SSOP8-P 1 TC4W53FU
U8 SMT IC SSOP8 1 LM2904V
L1-L3 SMT FERRITE BEAD (BLACK) 0805 3 271T
L4-L6 SMT FERRITE BEAD (BLACK) 0603 3 271T
J1 FLAT CABLE CONNECTOR SSOI32F 1 0.5S-1X-32PWB
J2 Jack PJ-3542 1 PHONEJACK STEREO
J3 Mic Connector SKY8 1 HAND MIC INTERFACE
S1 SWITCH 6×3.8×2.5 1 POWER
S2 SWITCH 6×3.8×2.5 1 FUNC
S3 DIAL 1 ENCODER
S4 SWITCH 6×3.8×2.5 1 V/M
S5 SWITCH 6×3.8×2.5 1 MHz
S6 SWITCH 6×3.8×2.5 1 TSQ
S7 SWITCH 6×3.8×2.5 1 CALL
S8 SWITCH 6×3.8×2.5 1 SQL
W1 VARIOUS RESISTOR 1 10K
Y1 CRYSTAL 1 3.58MHz
Y2 SMT CRYSTAL RESONATOR 1 7.3728MHz

JT220M
4
PARTS LIST
MAIN UNIT
Ref. No Parts No. Description of item Size (LxW)(mm) Qty Specification
C100-C104 SMT CAPACITOR 0603 5 103±10% 50V
C105-C109 SMT CAPACITOR 0603 5 102±10% 50V
C110-C111 SMT CAPACITOR 0603 2 104±10% 50V
C112-C113 SMT CAPACITOR 0805 2 104±10% 50V
C200-C213 SMT CAPACITOR 0603 14 103±10% 50V
C214 SMT CAPACITOR 0603 1 NOUSE
C215 SMT CAPACITOR 0603 1 103±10% 50V
C216 SMT RESISTOR 0603 1 0R±5%
C217 SMT CAPACITOR 0603 1 470P±10% 50V
C218-C225 SMT CAPACITOR 0603 8 103±10% 50V
C226 SMT CAPACITOR 0603 1 NOUSE
C227-C230 SMT CAPACITOR 0603 4 104±10% 50V
C231 SMT CAPACITOR 0603 1 NOUSE
C232-C237 SMT CAPACITOR 0603 6 104±10% 50V
C238 SMT CAPACITOR 0805 1 104±10% 50V
C240-C246 SMT CAPACITOR 0603 8 104±10% 50V
C248 SMT CAPACITOR 0603 1 104P±5% 50V
C249-C252 SMT CAPACITOR 0603 4 102±10% 50V
C253 SMT CAPACITOR 0603 1 103±10% 50V
C254-C257 SMT CAPACITOR 0603 4 102±10% 50V
C258 SMT CAPACITOR 0603 1 100P±5% 50V
C259-C262 SMT CAPACITOR 0603 3 102±10% 50V
C263 SMT CAPACITOR 0603 1 24P±5% 50V
C264-C265 SMT CAPACITOR 0603 2 102±10% 50V
C268 SMT CAPACITOR 1206 1 102±10% 50V
C268 SMT CAPACITOR 1210 1 102±10% 50V
C269 SMT CAPACITOR 0603 1 102±10% 50V

JT220M
5
PARTS LIST
Ref. No Parts No. Description of item Size (LxW)(mm) Qty Specification
C270 SMT CAPACITOR 1210 1 102±10% 50V
C271-C280 SMT CAPACITOR 0603 10 102±10% 50V
C281 SMT CAPACITOR 0805 1 470P±10% 50V
C282-C283 SMT CAPACITOR 0603 2 102±10% 50V
C284 SMT CAPACITOR 1206 1 102±10% 50V
C285 SMT CAPACITOR 0603 1 102±10% 50V
C286 SMT CAPACITOR 0603 1 104±10% 50V
C287-C288 SMT CAPACITOR 0603 2 102±10% 50V
C289 SMT CAPACITOR 0603 1 82P±5% 50V
C290 SMT CAPACITOR 0603 1 24P±5% 50V
C291-C292 SMT CAPACITOR 0603 2 NOUSE
C293 SMT CAPACITOR 0603 1 18P±5% 50V
C294-C295 SMT CAPACITOR 0603 2 NOUSE
C296 SMT CAPACITOR 0603 1 18P±5% 50V
C297-C298 SMT CAPACITOR 0603 2 2P±0.1P 50V
C299 SMT CAPACITOR 0603 1 1P±0.1P 50V
C300-C301 SMT CAPACITOR 0603 2 2P±0.1P 50V
C302 SMT CAPACITOR 0603 1 12P±0.25P 50V
C303 SMT CAPACITOR 0603 1 6P±0.1P 50V
C304 SMT CAPACITOR 0603 1 5P±0.1P 50V
C305 SMT CAPACITOR 0603 1 3P±0.1P 50V
C306 SMT CAPACITOR 0603 1 5P±0.1P 50V
C307 SMT CAPACITOR 0603 1 2P±0.1P 50V
C308-C309 SMT CAPACITOR 0603 2 NOUSE
C310-C311 SMT CAPACITOR 1210 2 NOUSE
C312 SMT CAPACITOR 1206 1 1P±0.1P 50V
C313 SMT CAPACITOR 1206 1 NOUSE
C314 SMT CAPACITOR 1210 1 NOUSE

JT220M
6
PARTS LIST
Ref. No Parts No. Description of item Size (LxW)(mm) Qty Specification
C315 SMT CAPACITOR 0603 1 NOUSE
C316 SMT CAPACITOR 0603 1 470P±10% 50V
C317 SMT CAPACITOR 0603 1 NOUSE
C318-C319 SMT CAPACITOR 1206 2 NOUSE
C320 SMT CAPACITOR 0603 1 103±10% 50V
C321 SMT CAPACITOR 0603 1 22P±5% 50V
C322 SMT CAPACITOR 0603 1 27P±5% 50V
C323 SMT CAPACITOR 1210 1 12P±5% 50V
C324 SMT CAPACITOR 0603 1 4P±0.1P 50V
C325 SMT CAPACITOR 0603 1 24P±5% 50V
C326 SMT CAPACITOR 0603 1 470P±10% 50V
C327 SMT RESISTOR 0603 1 0R±5%
C328-C340 SMT CAPACITOR 0603 13 470P10% 50V
C341 SMT CAPACITOR 0603 1 5P±0.1P 50V
C342-C344 SMT CAPACITOR 0603 3 16P±5% 50V
C345-C346 SMT CAPACITOR 1210 2 NOUSE
C347 SMT CAPACITOR 1210 1 10P±5% 50V
C348 SMT CAPACITOR 0603 1 NOUSE
C349-C350 SMT CAPACITOR 1210 2 15P±5% 50V
C351-C353 SMT CAPACITOR 0603 2 12P±5% 50V
C354 SMT CAPACITOR 0805 1 120P±5% 50V
C355 SMT CAPACITOR 0603 1 5P±0.1P 50V
C356 SMT CAPACITOR 0603 1 6P±0.1P 50V
C357 SMT CAPACITOR 0603 1 9P±0.1P 50V
C358 SMT CAPACITOR 0603 1 12P±5% 50V
C359 SMT CAPACITOR 0603 1 16P±5% 50V
C360 SMT CAPACITOR 0603 1 3.6P±0.1P 50V
C361 SMT CAPACITOR 1210 1 6P±0.1P 50V

JT220M
7
PARTS LIST
Ref. No Parts No. Description of item Size (LxW)(mm) Qty Specification
C362 SMT CAPACITOR 0603 1 7P±0.25P 50V
C363 SMT CAPACITOR 1210 1 8P±5% 50V
C364-C366 SMT CAPACITOR 0603 3 10P±5% 50V
C367 SMT CAPACITOR 0603 1 10P±0.25P 50V
C368 SMT SMALL FIXED INDUCTOR 0603 1 47NH
C369 SMT CAPACITOR 1210 1 82P±5% 50V
C370 SMT CAPACITOR 1210 1 68P±5% 50V
C371 SMT CAPACITOR 0603 1 56P±5% 50V
C372-C373 SMT CAPACITOR 0603 2 180P±5% 50V
C374 SMT CAPACITOR 1210 1 220P±5% 50V
C375-C377 SMT CAPACITOR 0603 3 100P±5% 50V
C378 SMT CAPACITOR 0603 1 33P±5% 50V
C379 SMT CAPACITOR 0603 1 68P±5% 50V
C380 SMT CAPACITOR 0603 1 680P±10% 50V
C381 SMT CAPACITOR 0805 1 474±10% 50V
C382-C383 SMT CAPACITOR 1210 2 100P±5% 50V
C384 SMT CAPACITOR 1210 1 8P±5% 50V
C385 SMT CAPACITOR 1210 1 12P±5% 50V
C386 SMT CAPACITOR 0603 1 5P±0.1P 50V
C387 SMT CAPACITOR 1210 1 NOUSE
C388-C392 SMT CAPACITOR 0603 5 NOUSE
C393 SMT CAPACITOR 1206 1 1P±0.1P 50V
C394 SMT CAPACITOR 0603 1 3P±0.1P 50V
C395 SMT CAPACITOR 0603 1 NOUSE
C396 SMT CAPACITOR 0603 1 10P±5% 50V
C397 SMT CAPACITOR 0603 1 9P±0.25P 50V
C398-C401 SMT CAPACITOR 0603 4 0.5P±0.1P 50V
C402 SMT CAPACITOR 0603 1 3P±0.1P 50V

JT220M
8
PARTS LIST
Ref. No Parts No. Description of item Size (LxW)(mm) Qty Specification
C403 SMT CAPACITOR 0603 1 0.75P±0.1P 50V
C404 SMT CAPACITOR 0603 1 22P±5% 50V
C405 SMT CAPACITOR 0603 1 18P±5% 50V
C406 SMT CAPACITOR 0603 1 103±10% 50V
C407 SMT CAPACITOR 0603 1 27P±5% 50V
C408 SMT CAPACITOR 0603 1 2P±0.1P 50V
C409 SMT CAPACITOR 0603 1 30P±5% 50V
C410-C411 SMT CAPACITOR 0603 2 47P±5% 50V
C500-C509 SMT CAPACITOR 0603 10 103±10% 50V
C510-C515 SMT CAPACITOR 0603 5 102±10% 50V
C516-C521 SMT CAPACITOR 0603 6 104±10% 50V
C522 SMT CAPACITOR 0603 1 104P±5% 50V
C523-C526 SMT CAPACITOR 0603 4 104P±5% 50V
C527 SMT CAPACITOR 0603 1 82P±10% 50V
C528-C530 SMT CAPACITOR 0603 3 NOUSE
C531 SMT CAPACITOR 0603 1 39P±5% 50V
C532 SMT CAPACITOR 0603 1 33P±5% 50V
C533 SMT CAPACITOR 0603 1 680P±10% 50V
C534 SMT CAPACITOR 0805 1 474±10% 50V
C535 SMT CAPACITOR 0805 1 474±5% 50V
C536-C537 SMT CAPACITOR 0603 2 390P±10% 50V
C538 SMT CAPACITOR 0603 1 273±5% 50V
C539 SMT CAPACITOR 0603 1 224±5% 50V
C540 SMT CAPACITOR 0603 1 222±5% 50V
C541 SMT CAPACITOR 0603 1 393±5% 50V
C542-C551 SMT CAPACITOR 0603 10 103±5% 50V
C552 SMT CAPACITOR 0805 1 104±10% 50V
C553 SMT CAPACITOR 0603 2 473±5% 50V

JT220M
9
PARTS LIST
Ref. No Parts No. Description of item Size (LxW)(mm) Qty Specification
C554 SMT CAPACITOR 0603 1 272±5% 50V
C556 SMT CAPACITOR 0603 1 102±5% 50V
C557 SMT CAPACITOR 0805 1 105±10% 50V
C558 SMT CAPACITOR 0603 1 332±5% 50V
C559 SMT CAPACITOR 0603 1 680P±5% 50V
C560 SMT CAPACITOR 0603 1 102±5% 50V
C561 SMT CAPACITOR 0603 1 47P±5% 50V
C562 SMT CAPACITOR 0603 1 333±5% 50V
C563 SMT CAPACITOR 0603 1 103±10% 50V
C564-C565 SMT CAPACITOR 0603 2 104±10% 50V
C800-C807 SMT CAPACITOR 0603 7 NOUSE
E100-E101 ELECTRO 10×15 2 470uF25V
E102-E105 ELECTRO 4×8 4 47uF25V
E200 ELECTRO 4×8 1 47uF25V
E202 SMT TANTALUM CAPACITOR A type 1 0.22uF±20% 35V
E203 ELECTRO 5×8 1 100uF16V
E204 ELECTRO 5×8 1 47uF25V
E205 SMT TANTALUM CAPACITOR B type 1 33uF±20% 10V
E206-E208 SMT TANTALUM CAPACITOR A type 3 10uF±20% 10V
E209 SMT TANTALUM CAPACITOR A type 1 0.22uF±20% 35V
E210 SMT CAPACITOR 1206 1 220P±5% 50V
E211 SMT TANTALUM CAPACITOR A type 1 4.7uF±20% 16V
E212 SMT TANTALUM CAPACITOR A type 1 0.1uF±20% 35V
E500-E509 SMT TANTALUM CAPACITOR A type 10 1uF±20% 16V
E510-E515 SMT TANTALUM CAPACITOR A type 6 10uF±20% 10V
E516 SMT TANTALUM CAPACITOR A type 1 4.7uF±20% 6.3V
E517 SMT TANTALUM CAPACITOR A type 1 2.2uF±20% 16V
E518 SMT CAPACITOR 1206 1 563±10% 50V