At 09:11 PM 1/7/05, you wrote:
> > >__________________________________________________________
> > >"He was Mr. Repeater"
> > >
> > >He sure was!
> > >
> > >K6MVH, Ken W. Sessions Jr. was editor of FM magazine and wrote the
> > >books: "Radio Amateur's F-M Repeater Handbook" and "The 2-Meter FM
> > >Repeater Circuits Handbook"
> >
> > The Repeater Handbook was the blue cover hardback printed by
> > Editors And Engineers, the Circuits Handbook was all the material
> > that was left over and was returned to Ken. When he went to work
> > for Wayne Green he took it along, and turned it into a book that
> > Wayne printed.
> >
> > Ken also wrote "The 2 Meter FM Handbook" that was published
> > by TAB books.
> >
> > I have copies of all of them.
>
>
>Yup I still have my "Repeater Handbook".
>
>Somewhat intriguing is an illustration in the Handbook of an
>*on-frequency* repeater. Was one of these ever built and used in
>practical form?
>
>Laryn K8TVZ
For those that never saw the book there was a few
paragraphs on an interesting concept.... an
"on-frequency" repeater. Picture a regular duplex
repeater with the RX and the TX on the same channel!
As the story I heard goes...
This device took advantage of a geographic anomaly
on Johnstone Peak - the lower site had the TX and the
upper site was behind a small ridgeline and couldn't
hear it.
The old W6NO repeater (pre 600khz days) listened
on 146.820 and transmitted on 146.70mhz, long
before RTTY took over 146.70...
Then the great conference took place, and all the Los
Angeles area repeaters moved to 600khz over a
month-long period. Neil WA6KLA can tell you about
that, as he was there.
The 82-70 W6FNO box was given the 146.22-82 pair,
(the group had started out as an ARES team on 146.82
simplex, and there were a LOT of 82 simplex rocks
around... with that pair at least the RX rocks would
be useful...).
They converted the TX at the lower site to 146.82 and
hooked it up to the wireline coming down from the RX
site where the 2m RX, the 440 repeater and combination
control system was... they were going to convert the lower
site, then the upper site. They expected an instant lockup
once the repeater was turned back on, but it didn't. It took
a few minutes to figure out why - they knew that the isolation
between the two sites was good, but never expected the
geography to provide isolation that was THAT good...)
For a while they experimented with the on-freq
repeater, even tried it with the autopatch, but ended up
converting the RX to 146.22 and having a conventional
carrier-squelch repeater.
The concept is valid, has been proven, and would work
on any set of frequencies and at any location where you
have split sites with adequate isolation between the two
sites.
BTW the W6FNO repeater has been in continuous
operation since at least 1967, possibly earlier...
It was first on 82-70, then on 22-82. It was WR6ACD
for a while, but it's the same group. Nowadays it's a
voting and simulcast system with 22-82 at both
Johnstone Peak (about 3000 feet) and at Onyx Peak
(at about 8,000 feet) over 60 miles away.
Anybody know of a repeater with a longer history?
Mike WA6ILQ
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