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IC28A.5
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1988-08-07
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The long, noisy squelch-tail of the Icom IC-28 (A or H model) 2-meter
transceiver can be shortened by replacing C110 (4.7 uf) with a smaller
value (0.1 to 0.47 uf). (I can't remember the source of this
information.)
I put a 0.33 uf in my IC-28H; it's a very worthwhile modification.
The capacitor is on the bottom board (the one with the lithium
battery), just southeast of IC4 as you face the front of the upside-
down radio. The only difficult part is finding the right p-c pads to
desolder on the back of the board.
To remove the board: Remove bottom plate, unplug speaker. Unplug
coaxial antenna connector (gray wire). Other connectors may remain in
place. Remove 5 mounting screws, one in each corner and one near
center. Tilt the board out of the radio. The button in the upper
left corner is CPU reset; you may have to reprogram the memories if it
is pressed. Remember that, although the radio is off, parts of the
circuit are still "hot" because of the memory-backup battery, so be
careful not to short any part of the board during the modification.
--
Frank W9MKV
reid@gold.bacs.indiana.edu