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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   <<<
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                        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

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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