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I have the opportunity to get some Ericsson GE Ranger radios. The model is the UHF (450-470Mhz) probably used on motorcycles. I'll need to program them on frequencies like 4xx.512.5 (12.5 khz step), is it possible in any way (also hw mods)? Or you can only set 4xx.500 or 4xx.525 and so on?
Unfortunately, the Rangr doesn't have any narrowband (12.5 kHz) capabilities. You might be able to get the synthesizer to produce the correct carrier frequency, but TX and RX will be wideband only (25 kHz).
That's good news. Depending on the divide-by ratio, some radios would produce the frequencies and some wouldn't.
If you can put up with the receive audio being low, you can always just adjust your CG and TX deviation pots for narrow-band operation and you should sound fine on the other end.