For the first time anywhere on the web, the Icom IC-2100H extended frequency transmit modification and mod instruction sheet.
The socessor to the very popular IC-2000 unit, the IC-2100H has been around for a few months now and is selling for about
$200 at most hamfests. The unit uncludes PL encode/decode, and 55 watts out at high power. But up until now the modification
insturctions have been unavailable!
Brought to you by:
Spectracom Communications, for all your commerical radio needs call 732-989-1091 or e-mail to Spectracom98@webtv.net.MODIFICATION.NET
W3EAX, Amateur Radio Association at the U of Maryland
KB3CVD, UMBC Amateur Radio Club
And amateur stations KC2AEI and W2SJW.
Please give us credit when copying these instructions!
1. Hold down the second and third front function buttons while turning the radio on. Now turn it back OFF.
2. Carefully remove the large tuning knob and remove the two hex screws that hold the faceplate on. Pull the faceplate
straight of the body without tilting it (you run the risk of bending the pin connectors behind the faceplate).
3. Turn the faceplate over and locate the main ic chip, set at a 45-degree angle. Just to the lower left and right
of the IC, you will see the main pin connectors. Under the lower right corner of the left pin connector, you should see a
marking on the pc board labeled as "D16". just below this should be the matching diode, close to the bottom edge
of the board. Remove this diode and carefully re-assemble the radio(watch those faceplate pins!!
The radio will now TX 136-174 Mhz. As far as i know, you do not have to reset the memory to make the mod work( i have
70 out-of-band memories stored, all of them worked without resetting the unit!!!!!
September 5, 1998 - KC2AEI