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Kenwood TM-2550 Mars/Cap [message #46] Fri, 31 March 2006 23:49
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The TM-2500 series radios may be easily modified for use on MARS/CAP frequencies from 141-150.995mhz. Locate the control unit (X54-1860-XX) on the bottom of the radio. This is the same board that the TU-7, and or MU-1 are mounted on. Just to the left of IC3 you will find a row of diodes. Cut diodes D8, and D11. After the diodes have been cut you will have to "reset" the microprocessor. Microprocessor Reset. 1. Press and hold the [PS] key. 2. Turn ON the power switch. 3. Release the [PS] key. All of your programmed data such as memory channel data, DCL data, and Phone number data will be erased and you will have to reprogram them. If the radio is not reset, it will not recognize that you have cut the two diodes.
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