|
Icom IC- 28A and 28H mods
NOTICE: TO ALL CONCERNED Certain text files and messages contained on this site deal with activities and devices which would be in violation of various Federal, State, and local laws if actually carried out or constructed. The webmasters of this site do not advocate the breaking of any law. Our text files and message bases are for informational purposes only. We recommend that you contact your local law enforcement officials before undertaking any project based upon any information obtained from this or any other web site. We do not guarantee that any of the information contained on this system is correct, workable, or factual. We are not responsible for, nor do we assume any liability for, damages resulting from the use of any information on this site.
IC28A.4
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 live so be sure not to short any part of the board during the
modification.
|
|