Kenwood TM-631A Service Manual page 53

TM-631A
ADJUSTMENT
Measurement
Adjustment
Test
Item Condition
Specification/Remarks
equip-
ment Unit Terminal Unit Part Method
3-1. DEV FREQ: 146.000
MHz
Linear
Rear
ANT1
TX-RX
VR3
+ 4.6
kHz (either +
or
+ 200
Hz
AG
1
kHz, 60 mV
detector
(144) (144) value which
is There should be no abnormal
Make transmission.
Dummy
larger)
within detecting range.
50
ohms)
Linear detector condition:
Divider
LPF: OFF
Oscillo-
HPF: 20 kHz
scope
Deemphasis:
OFF
3-2,
MIC GAIN AG
1
kHz 6 mV
+2.4
kHz-
+ 3.6 kHz
Make transmission.
Check
above
4. Protection FREQ:
146.000
MHz
Ammeter Final
VR3
5.5A
t0.2A
(CURRENT)
ANT
open
(144)
Make transmission
5.
TONE FREQ: 145.100 MHz
Linear
ANT
f:
88~89
Hz
LPF:
3
kHz
Make transmission
detector,
(144) DEV.:
+0.5~1
kHz HPF: 20 kHz
Dummy
Linear detector condition
Deemphasis:
OFF
load
(50
ohms)
220
MHz Receiver Adjustments
Measurement
Adjustment
Item Condition
Test
Specification/Remarks
equip-
ment
Unit Termina
Unit
Part
Method
FREQ:
222.540
MHz Tester
TX-RX TP2 TX-RX
L1~7
MAX.
1.
Receiving
sensitivity
SSG 0
dBa
(220) (220)
MOD
:
OFF
2. Discrim- FREQ:
222.540
MHz
Qscillo-
Rear
EXT TX-RX
L9
MAX.
inator
SSG 0
dBp scope panel
SP (220)
Millivolt-
meter
3. Squelch
FREQ: 222.540
MHz Oscillo-
EXT
TX-RX
VR1
Set to the position
(tight
MAIN
SOL. MAX.
scope
SP (220)
where noise is not
squelch)
SSG
-5
dBp
Milli- heard,
volt-
SSG
-4
dBy
Squelch
open
meter
SSG OFF
8:00 ~ 9:30
Rotate
SQL
to set to the position
where noise
is not heard.
4. S-meter FREQ:
222.540
MHz
SSG
Rear ANT1
TX-RX VR2
Set
to
$1.
SSG
-3
dBp panel
SP
Front S-meter (220)
panel
SSG
25
dBy
All LED
tight up.
5.
Sensitivity
FREQ:
222.540
MHz
Oscillo-
SP
12 dB
SINAD
or more
scope
SSG
-10
dBp
Millivolt-
Set the
band
edge
in
the same
way.
meter
FREQ:
220.040
MHz
Distortion
224.940
MHz
meter,
FREQ:
222.540
MHz
Oscillo-
SP
S/N ratio of
46
dB
or
better
6.
Signal-to-
noise (S/N)
SSG 60
dBu scope
ratio with
AF 0.63 V/8
0
Millivolt-
meter
high level
input Distortion
meter
52
TM-631A
ADJUSTMENT
Measurement
Adjustment
Test
Item Condition
Specification/Remarks
equip-
ment Unit Terminal Unit Part Method
3-1. DEV FREQ: 146.000
MHz
Linear
Rear
ANT1
TX-RX
VR3
+ 4.6
kHz (either +
or
+ 200
Hz
AG
1
kHz, 60 mV
detector
(144) (144) value which
is There should be no abnormal
Make transmission.
Dummy
larger)
within detecting range.
50
ohms)
Linear detector condition:
Divider
LPF: OFF
Oscillo-
HPF: 20 kHz
scope
Deemphasis:
OFF
3-2,
MIC GAIN AG
1
kHz 6 mV
+2.4
kHz-
+ 3.6 kHz
Make transmission.
Check
above
4. Protection FREQ:
146.000
MHz
Ammeter Final
VR3
5.5A
t0.2A
(CURRENT)
ANT
open
(144)
Make transmission
5.
TONE FREQ: 145.100 MHz
Linear
ANT
f:
88~89
Hz
LPF:
3
kHz
Make transmission
detector,
(144) DEV.:
+0.5~1
kHz HPF: 20 kHz
Dummy
Linear detector condition
Deemphasis:
OFF
load
(50
ohms)
220
MHz Receiver Adjustments
Measurement
Adjustment
Item Condition
Test
Specification/Remarks
equip-
ment
Unit Termina
Unit
Part
Method
FREQ:
222.540
MHz Tester
TX-RX TP2 TX-RX
L1~7
MAX.
1.
Receiving
sensitivity
SSG 0
dBa
(220) (220)
MOD
:
OFF
2. Discrim- FREQ:
222.540
MHz
Qscillo-
Rear
EXT TX-RX
L9
MAX.
inator
SSG 0
dBp scope panel
SP (220)
Millivolt-
meter
3. Squelch
FREQ: 222.540
MHz Oscillo-
EXT
TX-RX
VR1
Set to the position
(tight
MAIN
SOL. MAX.
scope
SP (220)
where noise is not
squelch)
SSG
-5
dBp
Milli- heard,
volt-
SSG
-4
dBy
Squelch
open
meter
SSG OFF
8:00 ~ 9:30
Rotate
SQL
to set to the position
where noise
is not heard.
4. S-meter FREQ:
222.540
MHz
SSG
Rear ANT1
TX-RX VR2
Set
to
$1.
SSG
-3
dBp panel
SP
Front S-meter (220)
panel
SSG
25
dBy
All LED
tight up.
5.
Sensitivity
FREQ:
222.540
MHz
Oscillo-
SP
12 dB
SINAD
or more
scope
SSG
-10
dBp
Millivolt-
Set the
band
edge
in
the same
way.
meter
FREQ:
220.040
MHz
Distortion
224.940
MHz
meter,
FREQ:
222.540
MHz
Oscillo-
SP
S/N ratio of
46
dB
or
better
6.
Signal-to-
noise (S/N)
SSG 60
dBu scope
ratio with
AF 0.63 V/8
0
Millivolt-
meter
high level
input Distortion
meter
52