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tm221a.1
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1990-09-10
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915b
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24 lines
TM221A.1
The TM-221A is capable of receiving from 138 to 174 MHz. With the mod
below, the rig will transmit from 142 to 151.995 MHz.
1.- Remove both the top and bottom cover. Disassemble the front
panel such that the foil side of control unit (X53-3040-XX)
is accessable.
2.- Locate R25 at the bottom left corner of the control unit.
Remove R25. You may just want to cut the trace on the left
side of R25.
3.- Reassemble the unit. Preform a microprocessor reset.
I would like to extend transmit to at least 154.995 MHz. I removed R22
with some interesting results. First the frequency step changed to
12.5 Hz. Second the "ON AIR" indicator came on with PTT depression;
however, my watt meter indicated no power on any frequency (including
2 meters). Any help would be appreciated.
Best 73s
Wally KC4ANB @ W4CUE (Birmingham, AL)