Subject: Icom IC-2100H Extended Transmit Mod

http://w3eax.umd.edu/~rob/

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Icom IC-2100H Extended Transmit Mod Sheet

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

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!

STEP 1: HOLD DOWN THE SECOND AND THIRD FRONT FUNCTION BUTTONS WHILE TURNING
THE RADIO ON. NOW TURN IT BACK OFF.

STEP 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).

STEP 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