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TM-642A
ADJUSTMENT
Transmitter Section Adjustment
Measurement
point
Adjustment point
Item
Condition
Test
Specification
equipment
Unit
Terminal
Unit
Parts
Method
1. Maximum
1.
Frequency: 222.500 MHz
Powermeter
Rear
ANT
TX-RX
VR3
Check
28Wormore
power check
Transmit
Ammeter
Panel
(reference)
2
.
High -power
1.
Frequency: 222.500 MHz
TX-RX
VR3
Adjust
26W
adjustment
Transmit
(c heck
)
2.
Frequency:
222.000 MHz
Check
22Wor more
Transmit
3.
Frequency:
224.980 MHz
Check
22Wor more
Transmit
3
.
Medium
-
1.
Frequency:
222.540 MHz
Powermeter
Rear
ANT
TX-RX
VR4
Adjust
11W
power
Transmit
Panel
adjustment
2.
Frequency:
222.000
MHz
Check
9Wor more
(chec
k)
Transmit
3. Frequency: 224.980 MHz
Check
9Wor more
Transmit
4
.
Low-power
1.
Frequency: 222.540 MHz
Powermeter
Rear
ANT
Check
3.0- o.OW
check
Transmit
Panel
2.
Frequency: 220.000
MHz
Check
3 .0
-
B.OW
Transmit
3. Frequency: 222.980 MHz
Check
3.0- B.OW
Transmit
5.
Deviation
1.
Frequency:
222.500 MHz
DC detector
Rear
ANT
TX-RX
VR2
Adjust
.±.4.4KHz
.±.
200
Hz
adjustment
AG
:
1
kHz,
50
mV
Oscilloscope
Panel
4
.4 KHz
!check)
Filter:
~
AG
K
Transmit
2.
Frequency:
222.500 MHz
Check
±
2 .2 to 3
.6
KHz
AG:
1
kHz,
5.0
mV
Filter:
~
K
Transmit
6
.
Frequency
1.
Frequency:
222.500 MHz
Frequency
Rear
ANT
TX-RX
TC1
Adjust
222.500
MHz
.±.2KHz
adjustment
Transmit
counter
Panel
Power meter
7
.
Protection
1. Frequency:
224.980 MHz
Ammeter
Check
7.5A
or
less
check
Antenna
:
Open
Transmit
I
0
0
00
0
0
0
0
:t
....,
0
0
0
0
~VR3
Lt©
v
li!}
VR2
TCI
D
®
VRI
u~©
®
®
0
-?P2
0
L6[Q]
L4©~
TP1
....._
0
0
0\.
30
Fig
.
62
220 MHz band adjustment: Component layout (upper view)
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