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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 # 934
MODEL: TM-221A
SUBJECT: Final Module Hints
When the Final module is replaced in a TM-221A, there is a
possiblity that the transmit power will not go higher than
47 watts, even witht he APC turned OFF. This is due to
variances in input impedance of Final Modules. To correct
this condition, an 8 pF capacitor can be added between the
input of the module and ground. With some modules, a value
between 8 pF and 15 pF will be required. Try to choose a
value as close to 8 pF as possible to prevent oscillation.
The capacitor should be designated as C19 on the Final Unit
(X45-1360-02).
Required Part
8pF Ceramic Capacitor Part # CC45CH1H080D
Alignment:
1. Turn the APC off (TX-RX unit VR-6: Clockwise).
2. Adjust TC3 TC4 (TX-RX) for maximum power supply current.
Since the APC is off, the Final will produce very high
power output. It is important to perform this step as
quickly as possible.
3. Adjust the APC for 45 Watts.
Time required for this modification is 0.25 hrs or less.