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TM-642A
ADJUSTMENT
• 220 MHz Band
Common Section Adjustment
Measurement point
Adjustment point
Item
Condition
Test
Specification
equipment
Unit
Terminal
Unit
Parts
Method
1
.
Lock voltage
1. Frequency: 215.000 MHz Digital
TX-RX
TP2
Check the lock
1.2- 2.6V
check
Receive
voltmeter
voltage
Receiver Section Adjustment
Measurement point
Adjustment point
Item
Condition
Test
Specification
equipment
Unit Terminal
Unit
Parts
Method
1.
Bandpass
1.
Frequency: 222.540 MHz
Digital
Rear
ANT.
TX-RX
L1-4 Voltmeter reading
Voltmeter reading is
filter
(BPF)
SSG
output: -113dBrnt0.5J.LV
voltmeter SSG Panel
is maximum.
maximum.
adjustment
Modulation: 1KHz
Deviation: 3KHz
Receive
2
.
Distortion
1. Frequency: 222.540 MHz
Distortion
Rear
EXT.
SP
TX-RX
L6
Minimize the
5% or less
factor
SSG output: -103dlm/1.58J.1V
meter
Panel
distortion factor
adJustment
Modulation: 1KHz
Oscilloscope
Deviation: 3KHz
SSG
3
.
Receivie
1. Frequency: 222.540 MHz
Distortion
Rear
EXT.SP
Check
12dB SINAND or more
sensitivity
SSG output: -121dBrn'0.2J.LV
meter
Panel
check
Modulation: 1 KHz
Millivoltmeter
Deviation: 3KHz
Oscilloscope
SSG
2. Frequency: 215.040 MHz
Rear
EXT.
SP
Check
12dB SINAND or more
SSG output: -121 dBrnt0.2J.1 V
panel
Modulat1on: 1 KHz
Deviation: 3KHz
3. Frequency: 229.980 MHz
Rear
EXT.SP
Check
12dB
SINAND
or more
SSG output: -121dBrnt0.2J.LV
panel
Modulation: 1KHz
Deviation: 3KHz
4. Signal
1.
Frequency: 222.540 MHz
SSG
TX-RX
VR1
Adjust so that all
strength
SSG output: -92dBmf.i.6J.LV
LEOs go on. then
meter
Modulation: 1KHz
one LED goes off.
adjustment
Deviation: 3KHz
5. Signal
2. Frequency: 222.540 MHz
Adjust the SSG
The SSG output is
20
±
strength
SSG output: -91dBm16.3J.LV
output
so
that all
6 dBil
meter check
Modulation: 1KHz
signal strength
Deviation: 3KHz
meter LEOs go on.
6. Squelch
1. Frequency: 222.540 MHz
SSG
Rear
EXT.
SP
Set
the
SOL
Control position
check
SSG output: OFF
Panel
control to the
8:00-1
1
00
closing position
BUSY should
go out
2. Frequency: 222.540 MHz
Squelch should
open,
SSG output: -127dBrnt0.1J.LV
and
BUSY
should
Modulation:
1
KHz
Deviation: 3KHz
SOL control fully
Noise should
clockwise
disappear
3.
SSG
output: -116dBrnt0.36J.LV
Squelch should
open
29
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