![]() Principle of the Interface PCB 1258M which has to be installed in the socket for the red straps (Control- RRC only). If you do not have the Adapter board and have a modified IC-7100 it will show up in the way that you can switch on the radio, The information on the display looks normal but you get no speaker audio and the VFO and buttons do not work. ![]() The ICOM modification was done from serial numbers US>02003001 and in EU>03003601. Icom 7100 Mods IC7100 Mods Getting Full Power from the 7100 and Expanded. The Adapter 1258M can be used both for early IC-7100 and modified IC-7100 Txt: 531: 10-29-2000: Icom 736 Mod File: ic737 IC-730 adjust frequency. This board is quite simple and can be built by your self also. The Adapter is available in our webshop or from the distributors. According to Jorge PY3CC this capacitor is Tantalum one, but looking at schematic diagram, any good quality 10uFd will do the job. ![]() To handle this modification in the Remoterig a adapter PCB called 1258M has to be installed in the (red)strap socket of the Control-RRC. SECOND mod - 'HARD' - should give full power on SSB, labelled ' 2 ' - 10uFd capacitor added across R1522 slightly below mod ' 1 ' with positive '+' leg attached to R1523. They have solved it by reducing the amplitude of the data sent from control to main unit. The reason of the modification was to avoid that data communication will be heard in FM mode at low modulation levels. ![]() ICOM have made a hardware modification lately (March 2014) which makes later produced rigs incompatible with the original Remoterig boxes (New IC-7100 control panels are also incompatible with old IC-7100 main units). ![]()
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