Here is the preliminary schematic. Because the synth chip in the radio uses +9 V for some reason, this will have to be a board with SMD parts on it instead of a single chip.
The plan is for Channel 1 to start at 223.85 with 10kHz spacing and
channel 201 starts at 222.15 MHz. There will be jumpers to select
wheather the board is in the RX or TX module so the 1.6MHz spacing is
observed, this may be changed though as the program could be written
so that it would look at the incoming data and know which side it was
in which would be better for mobiles and HTs anyway.
Also a jumper would select 5kHz spacing to allow tighter spacing with
20 channels in the ACSSB portion of the band from 222.15 - 222.25 /
223.75 - 223.85. This would also extend into the normal FM portion
but not cover all of it.
Still searching for a repeater to experiment on to write the software
needed for the board to run. Let me know if anyone has one cheap.
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