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IC-746 FAQ
7
Modifications
7.1
What TX/RX "mods" are there for the IC-746?
"mod" is slang for "modification".
Most people who ask about modifying their radio are looking for ways to make the IC-746
transmit or receive additional non-amateur RF bands. The 746 already has general receive
coverage from 0.5 to 60.0Mhs, so no "mod" there.
Modifying the IC-746 to transmit outside of the amateur bands is generally considered to be
illegal. There are a few exceptions; like perhaps MARS/CAP, transverter usage,
changes/additions to ham bands, etc..., but they can become controversial.
Icom will give you the correct mod for your IC-746 based upon your serial number,
providing you give them a copy of your MARS license to prove eligibility. If you let Icom
make the mod for you (small fee plus shipping), then the mod will not void your warranty
That said, MARS/CAP/TX/RX modifications for the IC-746 (and many other radios) can be
found at:
Another source for the TX/RX mods is QRZ.COM
http://www.qrz.com/download/mods-i-k/ic746.txt
Pay close attention, as there are two distinct mod procedures, which correspond to the
differing placement of the programming diodes on the PCB.
7.2
What other "mods" are there for the IC-746?
Not all mods are about TX/RX frequencies. Here are some of the others.
Note that none of the following modifications were either provided by or approved by Icom.
These all come from fellow hams. Each "mod" exists for a reason, but that reason may not
apply to your circumstances.
Use at your own risk.
6Khz wide IF filters
W2ENY has devised a way to replace the stock 15KHz or 9MHz IF filters for AM work with
6KHz filters.
http://www.geocities.com/w2eny/icom/filter.htm
N9IRD also talks about this type of mod at:
http://www.qsl.net/icom/n9ird.html
Page 82 of 113
2003-02-08