In Win96's "Extended Tables" box, the Marin County system's table info would likely be entered as follows:
Code:
CH Lo CH Hi Base Freq Offset Step
380 569 482.00000 380 12.500
570 759 488.00000 570 12.500
Also, you'll need to check the "Use these entries for 3600 bps systems" box.
My CH Lo and CH Hi values above are based on the presumption that this system, like a "default" 400 MHz system, uses channel numbers from 380 to 759.
When the PRO-96 receives channel info on the CC, it looks through the tables to find an entry whose CH Lo / CH Hi fields contain the target channel. It then subtracts the Offset channel, multiplies by the Step size, and adds the Base Freq. The final result is the voice frequency.
For example, if the CC indicated "channel 608", the PRO-96 would use the second table entry above. It would subtract the offset 570, multiply the result ( 38 ) by 12.5 kHz (getting 0.4750 MHz), then add the base freq 488.0000 MHz. The voice frequency is then 488.4750 MHz.