Kenwood TM-281A, Service Manual

Page: 28 / 50

TM-281A
28
ADJUSTMENT
Item Condition
Measurement Adjustment
Specifi cations / Remarks
Test-
equipment
Unit Terminal Unit Parts Method
3. Squelch
Open
• Wide
[Low]
1) Adj item: [SQOL.]
2) SSG output
: –124dBm (0.14µV)
SSG MOD: 1kHz
SSG DEV: 3kHz SSG
Oscilloscope
AF VM
Distortion
meter
Rear
panel ANT
EXT. SP
Front
panel Tuning
control Write
[Center] 3) Adj item: [SQOC.]
Adjust:
[
✳✳
]
4) SSG output
: –124dBm (0.14µV)
[High] 5) Adj item: [SQOH.]
Adjust:
[
✳✳
]
6) SSG output
: –124dBm (0.14µV)
• Narrow
[Center] 7) Adj item: [SQOC.]
(“N” icon apper)
Adjust:
[
✳✳
]
8) SSG output
: –124dBm (0.14µV)
SSG MOD: 1kHz
SSG DEV: 1.5kHz
4. RSSI writing 1) Frequency: 155.050MHz
2) SSG output: –53dBm (501µV)
SSG MOD: 1kHz
SSG DEV: 3kHz
RSSI value writing
is performed by the
“Squelch open”
item (center wide).
SSG output level
is changed and ad-
justed after Squelch
adjustment.
This adjustment
should not turn the
Tuning control.
5. S-meter
S1 1) Adj item: [S1.]
Adjust:
[
✳✳
]
2) SSG output
: –118dBm (0.28µV)
SSG MOD: 1kHz
SSG DEV: 3kHz
Write
6. S-meter
Full
scale
1) Adj item: [S7.]
Adjust:
[
✳✳
]
2) SSG output
: –96dBm (3.54µV)
SSG MOD: 1kHz
SSG DEV: 3kHz