> Eric I was just relaying what I was told (by a gov radio
> tech) about how
> the repeater handels encrypted communications. It just passes audio
> straight through be it encrypted or analog. That way someone at the
> repeater site can not eavesdrop on the secure communications going
> through the repeater. At least that is the way it was explained to me
> and that is how I understood it. The extra cards and such just handle
> keying functions and encoding I believe.
In analog mode, yes, it works like a regular analog repeater. In DVP mode,
it regenerates the received data stream so that noisy input signals aren't
re-transmitted as-is, it's clean, re-clocked data that goes back out the
transmitter.
Micor DVP receivers (at least on UHF, haven't tinkered with VHF) have
different IF filtering to provide lower distortion for better recovery of
DVP. Standard Micor receivers don't work well with DVP. IIRC, the DVP
exciters have the "flat audio board" akin to what was also used in
Micor/PURC paging stations. WA9ZZU probably has details on this.
A local club picked up two real-deal "M" split 142-150 MHz Micor stations,
brand new, from military surplus a few years ago, possibly from the same
place this UHF station came from. Maybe there's a whole stash of ham-band
Micors sitting in a government warehouse somewhere. Maybe Area 51?
--- Jeff WN3A
