Kenwood TS-120S Service Manual page 39

ADJUSTMENTS
Measuring point Adjust
Item
Condition
Specifications/Remarks
Instruments Unit {Terminal} Unit Parts Reference
7. TX BPF
Maintain adjustment
3.5 MHz L3, 4, 5,
7 MHz L6, 7,8
order 3.5
MHz,
12.58
a via ae mre Sweep
Adjust coils
1503,
r generator
RF RE
L3~17 for waveform
ten
Oscilloscope | PLL
as shown
at
12.33 12.83)
:
Detector right (Fig. 15)
2 es
ae,
Ripple ratio less than 5 dB Ripple ratio less than 2 dB
8. RX BPF This adjustment
Tracking
Rear
RF
L38~17 | Same as above
requires a spectrum | generator panel
(Fig. 16)
30.08
analyzer and track-
23.33 3493 29.83 r t , 30.33
ing generator.
Otherwise
adjust
22.83
as in item 7.
va
ya
Spectrum RF
analyzer
— a
Ripple ratio less than 2 dB Ripple ratio less than 1 dB
9. iF AMP
1) VFO: 250
SSG SP
RF T3
1) Adjust for a
BAND: 14MHz_ | Oscilloscope IF T1~17 maximum
MODE: USB
AF VTVM
output
36.83 38.83
82 dummy or 2) Apply SSG 37.23
speaker output at (.25 ;
uV) —6 dB to
the antenna
terminal signa:
to noise ratio
Ripple ratio iess than 2 dB
. LF trap
LL
SSG
AF VTVM
Connect the noise
generator to ANT
terminal.
S-meter reading
S5~7.
Noise
generator
Oscilloscope
approx. 15 dB
Adjust for mini-
mum S-meter
reading and AF
output level
repeat.the pro-
cedure two
or three times.
Adjust for a
wave form as
shown at right,
repeat the pro-
cedure two or
three times
Check for 80 dB attenuation
of 8.83 MHz signal. (Fig. 17)
i
Before adjustment
. Counter
standard
Oscillator
BAND: WWV
VFO: 500
(15.000 MHz)
CAL ON
Set the BAND
switch to WWV
dial scale: 500)
connectan.
antenna to the
set.
While receiving
WWYV Signal at
15 MHz, adjust
trimmer TC1 at
the side of
counter unit
for zero beat
between this
signal and 15
MHz
and CAL
|
After adjustment
Set the zero beat between WWY
. Base
current
MODE: LSB
MIC: Counter-
clockwise
BAND: 14 MHz
SEND position
. Carrier fe Adjust at 14 MHz
suppression
for RF full CW
power. Switch
to SSB position.
No input
—————
RF power
meter
Current meter
Power meter
Oscilloscope
Direction
coopler
150 mA
100 mA
i
arrier better
than 40 dB down
from output
signal
1) After adjustment, move th wire
from D14 to L7 side.
2) After adjustment, resolder
red wire to 3P terminal.
* Repeat the procedure two ¢ three
times