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World of Ham Radio 1997
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==============================================================================
K E N W O O D
>>> A M A T E U R R A D I O S E R V I C E B U L L E T I N <<<
==============================================================================
Kenwood Service Centers
Kenwood Service Corporation Kenwood Service Center, East
2201 East Dominguez Street 829 Lynnhaven Parkway, Suite 130
Long Beach, California 90801 Virginia Beach, Virginia 23452
Telephone 1-310-639-5300 Telephone 1-804-340-1702
==============================================================================
BULLETIN # 910
MODEL: TS-940S
SUBJECT: AGC CIRCUIT IMPROVEMENTS
The following changes will improve the adjacent channel rejection of
the TS-940S when a relatively strong nearby signal is present (S-4 or above).
The AGC switch should remain in the SLOW position for all but high speed
data communications. Most CW operations will also benefit from operation
in the SLOW position.
Parts Required:
15K ohm 1/4 watt resistor RD14CB2E153J
1 uF 16v Electrolytic CE04BWlE010M
lS1555 diode V1S1555
.047 uF capacitor C91-0119-05
Procedure:
RF UNIT
1. Remove jumper wire JP7 and replace it with the parallel combination
of the 15 k ohm resistor and the 1S1555 diode. Pay close attention
to polarity. The cathode goes TWORD Q15.
2. Add the 1 uF capacitor from the added resistor/diode junction (cathode
end) to ground.
IF UNIT
Change capacitor C75 from a 1 uF 50 v capacitor to a .047 uF 50v capacitor.