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TM-642A
ADJUSTMENT
•
144 MHz Band
Common Section Adjustment
Measurement point
Adjustment point
Item
Condition
Test
Specification
equipment
Unit Terminal
Unit
Parts
Method
1.
Lock
1.
Frequency: 144.040MHz
Digital
TX-RX TP2
Check
the lock
1.6- 3.0V
voltage
Receive
voltmeter
voltage.
check
The DC
power
supply
must
be
set
to the rated
voltage.
Receiver Section Adjustment
Measurement point
Adjustment
point
Item
Condition
Test
Specification
equipment
Unit Terminal
Unit
Parts
Method
1.
Bandpass
1.
Frequency: 144.040MHz
Digital
TX-RX
L
1-4
Adjust so
that
the
Voltmeter
reading
is
filter (BPF)
SSG
output:
-113<13m'0.5J.LV
voltmeter
voltmeter
reading
maximum.
adjustment
Modulation:
1 KHz
SSG
IS
maximum.
Deviation
:
3
KHz
Rece1ve
2.
Receive
1. Frequency:
144.050
MHz
Distortion
Rear
EXT.SP
Check
12
dB
SINAD
or more
sensitivity
146.050MHz
meter
panel
check
147.950MHz
Millivoltmeter
SSG
output:-122dBmi0.16J.LV
Oscilloscope
Modulation:
1
KHz
SSG
Deviation: 3
KHz
2.
AM
sensitivity
(K and P
Press
the MHz
key 12 dB SINAD or
more
models only)
and
check
that
the
Frequency:
118.050MHz
frequency is
set
SSG
output:
-73dBmt50J.LV
to
118.050
with an
Modulation:1
KHz
encoder.
Deviation:
30%
Press
the
MR
key
3.
Distortion
1.
Frequency:
145.040 MHz
Distortion
Rear
EXT.SP
TX-RX
L6
Minim1ze
the
5% or less
factor
SSG
output:
-73dBm'50J.LV
factor
panel
distortion
factor.
adjustment
Modulation:
1
KHz
Oscilloscope
Deviation:
3KHz
SSG
AF
output:
4V/8
ohms
4.
Signal
1.
Frequency: 145.040
MHz
SSG
TX-RX
VR1
Adjust
so that
all
strength
SSG output:
~1dBmi6.31LV
LEOs go on. then
meter
Modulation:
1
KHz
one LED goes
off.
adjustment
Deviation:
3
KHz
2
SSG
output:
--90dBmi7.1J.LV
Adjust
the
SSG
The SSG output is 20
±
MOD: 1
kHz
output so
that all
6
dB~
DEV:
3kHz
signal strength
meter LEOs
go
on.
5.
Squelch
1. Frequency: 146.040 MHz
SSG
Rear
EXT.SP
Set
the
SOL
Control position
check
SSG
output:
Off
panel
control
to the
8 :00-1
1:00
Modulation:
1 KH
z
closing
position
BUSY
should
go
out
Deviation
: 3 KHz
2
SSG output:
-
127cl3m'0.1J.LV
Squelch
should
open
,
MOD
:
1 kH
z
and
BUSY
should
DEV: 3kHz
light
up
SOL
control
fully
Noise
should
clockwise
disappear
3.
SSG
output:
-116d3m/0.36J.LV
Squelch
should
open
27
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