Kenwood TM-481A, Service Manual, Page: 27 / 50

TM-481A
27
ADJUSTMENT
Receiver Section (Refer to the Table 1 on page 22 for the frequencies which will apply in the adjustment mode.)
Item Condition
Measurement Adjustment
Specifi cations / Remarks
Test-
equipment
Unit Terminal Unit Parts Method
1. Band Pass
Tuning
[Low]
1) Adj item: [BPL.]
Adjust:
[
ᲤᲤ
]
2) Spectrum analyzer setting
Center-f: 400.050MHz
Span: 200MHz
RBW: 100kHz
VBW: 100kHz
ATT: 5dB
3) Tracking generator output
:
–30dBm
Spectrum
analyzer
Tracking
generator
Rear
panel
TX-RX
(A/2)
ANT
BPF
Front
panel Tuning
control
By turning the Tun-
ing control, adjust
the band-pass fi lter
waveform as shown. Refer to Fig. 1 (page 23).
[Center] 4) Adj item: [BPC.]
Adjust:
[
ᲤᲤ
]
5) Spectrum analyzer setting
Center-f: 435.050MHz
Span: 200MHz
RBW: 100kHz
VBW: 100kHz
ATT: 5dB
6) Tracking generator output
:
–30dBm
Refer to Fig. 2 (page 23).
[High] 7) Adj item: [BPH.]
Adjust:
[
ᲤᲤ
]
8) Spectrum analyzer setting
Center-f: 46
9 . 9 50MHz
Span: 200MHz
RBW: 100kHz
VBW: 100kHz
ATT: 5dB
9 ) Tracking generator output
: –30dBm
Refer to Fig. 3 (page 23).
2. Squelch
Tight
• Wide
[Low]
1) Adj item: [SQTL.]
Adjust:
[
ᲤᲤ
]
2) SSG output
: –117dBm (0.32µV)
SSG MOD: 1kHz
SSG DEV: 3kHz
SSG
Oscilloscope
AF VM
Distortion
meter
Rear
panel ANT
EXT.
SP
Write
[Center] 3) Adj item: [SQTC.]
Adjust:
[
ᲤᲤ
]
4) SSG output
: –117dBm (0.32µV)
[High] 5) Adj item: [SQTH.]
Adjust:
[
ᲤᲤ
]
6) SSG output
: –117dBm (0.32µV)
• Narrow
[Center] 7) Adj item: [SQTC.]
(“N” icon appear)
Adjust:
[
ᲤᲤ
]
8) SSG output
: –117dBm (0.32µV)
SSG MOD: 1kHz
SSG DEV: 1.5kHz