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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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1997-02-01
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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 # 907
MODEL: TS-940S
SUBJECT: ANTENNA TUNER RELAYS
Occasionally during operation of the AT-940 a VSWR Of greater than 1.5
to 1 might cause overloading of the relay contacts in the antenna tuner.
This may be especially noticeable when switching BANDS, or if TUNING is
performed too frequently. The following procedure should reduce or
eliminate this tendency.
Perts Required
Q69: Digitel Trensistor DTC124ES
R304: 5.6K ohm 1/6 W Resistor RD14BB2C562J
Procedure:
1. Add the circuit as shown below.
2. After the circuit has been installed adjust VR4 for a 10-15 watt
output when the antenna tuner operates.
\
Q37 |-----------> To PC
/ |
5.6 K (added)
|
|
\
Added |----------->to D45 Anode
/ In
|
GND
Time required for this modification is 1 hour or less