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FM Polar Adjustment (East European, CIS model)
Connection 1 :
FM RF SSG
75 Ω coaxial
Carrier frequency: 69 MHz
1 mV (60 dB µ ) (at 75 Ω open)
Output level:
Modulation:
AUDIO 1 kHz, 10 kHz deviation
Connection 2 :
AF OSC
FM RF SSG
Audio 31.25 kHz
external
modulation
terminal
Carrier frequency: 69 MHz
1 mV (60 dB µ ) (at 75 Ω open)
Output level:
Modulation:
AUDIO 31.25 kHz, 10 kHz deviation
(EXTERNAL MODULATION)
Adjustment Location:
[TCB BOARD] (Conductor Side)
level meter
TP1701
(FILTER)
frequency counter
TP1702
(VCO)
set
FM antenna
terminal (75 Ω )
75 Ω coaxial
set
FM antenna
terminal (75 Ω )
IC1701
Procedure :
1.
Set the modulation of FM RF SSG to AUDIO 1 kHz, 10 kHz
deviation according to "Connection 1".
2.
Tune the set to 69 MHz.
3.
Adjust the RV1702 so that the reading of frequency counter
connected to TP1702 (VCO) becomes within 31.25 kHz ± 0.05
kHz. (VCO adjustment)
4.
Then record the reading of the level meter connected to TP1701.
5.
Set the modulation of FM RF SSG to AUDIO 31.25 kHz, 10
kHz deviation according to "Connection 2".
6.
Tune the set to 69 MHz.
7.
Set the CT1701 to be mechanical center.
8.
Adjust the L1701 so that the reading of the level meter
connected to TP1701 (FILTER) becomes maximum.
Then adjust the CT1701 so that the reading of the level meter
connected to TP1701 (FILTER) becomes maximum. (SUB
CARRIER PEAK Adjustment)
9.
Adjust the RV1701 so that the level at the moment becomes 14
dB higher value than the level recorded in step 4. (SUB
CARRIER LEVEL Adjustment)
Adjustment Location: TCB board
[TCB BOARD] (Component Side)
IC1701
RV1702
VCO
— 11 —
L1701
Sub Carrier Peak
CT1701
RV1701
Sub Carrier
Level
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