
                    Taming IC28 squelch
                    ===================

The long, noisy squelch-tail of the Icom IC-28 (A or H model) 2-meter
transceiver can be shortened by replacing C110 (4.7uF) with a smaller value
(0.1 to 0.47uF).
I put a 0.33uF 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 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

(Downloaded from GB7SYP)
