> "John Lloyd" <[EMAIL PROTECTED]> wrote:
> ...all of the broadcasters that I know of have
> repeaters that transmit in the low end of 450 Mhz.
> I thought that this was the same all over the
> country. Maybe this is different in your area.
Nothing is fixed in stone, one broadcast group I work
with uses both directions for Duplex and direct RPU
operation. Sometimes at the same time... go figure.
> All I am trying to say is that with the Broadcasters
> repeaters transmitting near the low end of 450 Mhz,
> it seems prudent that the amateur repeaters would
> want some frequency isolation from them especially
> at a co-located site and would want to use a low
> input frequency for their repeaters. It just make
> sense!
Maybe for better adjacent or co-site operation. Most
of the time, there probably isn't a choice. In Northern
CA, we deal with a High Power, Over The Horizon - UHF
Military Radar problem in the low portion of the band.
Just pick your dragon of choice and grab a sword...
> I guess your local bandplan will take precident
> in how you operate with either a low input or
> high input.
The current 440-450 bandplan was setup long before I became
interested in UHF Amateur Repeaters. I'm happy to say that our
current "Dysfunctional" Coordination Group had nothing
to do with that choice. We probably adopted an option of the
original ARRL Plan from decades back.
> Combiners and antenna management are a must in
> high RF environments!
I agree, wish everyone felt that way...
> By the way, all we had back many years
> ago were GE mobiles and repeaters so we
> just bought the crystals for the Ham
> frequencies we wanted to operate on.
Still have a few Pre-Progress, Progress and Master Progress
Repeaters in storage. The first boat going down the freeway
near my shop might find them attached to the anchor chain.
I have to keep them away from the Motorola G Strips, Sensicon
and "Research Line" Cabinets, else they fight with each other
or gang up on the RCA Series 500 repeaters.
> Thanks and 73's
> John, K7JL
cheers John,
skipp
www.radiowrench.com
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