This page describes how to expand the coverage
to 26 Mhz -29.6 Mhz on the CPU.
If the main chip is a UC-1250A it is 10m band only and this mod will not work,
if it has a UC-1250, UC-1201A, UC-117 or another chip (quite a few were used) then expansion is possible using this method.
You will need to remove the screws from the sub pc board, to gain access to the bottom of the board.
Locate pins 34 and 35 on the main I.C. (IC315) you will notice that these two pins are connected together and that they are grounded (0V), cut the track that connects them to ground, now jumper from pins 34 and 35 to the vacant pin on the end of the resistor pack (RR301)
Your done !!
This will give you coverage from 26.000 to 29.699 Mhz (some radio's will go to 29.999 Mhz)
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