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097.SB934.DOC
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1993-04-19
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SB-934
TM-221A Final Module Hints 4/11/89
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.
This modification may be performed under warranty.
Time required for this modification is 0.25 hrs or less.
(c) 42888TKC
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