After reviewing the transmitter schematic (yeah, I found it) it seems that the
audio feeds rather directly into the trans with little filtering. It might
make a good packet radio at 9600 even.
Anyway, my guess is that this is due to the PL encode coming in that line and
it needing to pass it on correctly, of course the ability of it creating spurs
with this design is also fairly evident.
----- Original Message -----
From: Paul Plack
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, November 23, 2008 2:01 AM
Subject: Re: [Repeater-Builder] Information on Spectrum Communications
SCR-1000
These repeaters got a bad reputation in part because of hams who tuned them
be peaking rather than using the procedure in the manual. The PA was fairly
efficient, but not unconditionally stable, and could produce spurs if not
properly tuned.
One other issue was the combination of Spectrum repeater and ACC controller,
which was once a very common setup. One of the busier systems in Atlanta in the
80's used this combo, and despite proper tuning, it was incredible dirty, with
spurs at regular frequency intervals. Many hairs were torn out until it was
discovered that the ACC's digital clocking noise passed down the PTT line was
actually modulating the exciter.
From my point of view, that's a boo/hiss on both ACC and Spectrum.
73,
Paul, AE4KR
----- Original Message -----
From: Mike Reed
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, November 22, 2008 11:44 PM
Subject: Re: [Repeater-Builder] Information on Spectrum Communications
SCR-1000
I have one of those critters also, but no book. Spectrum wants a small
fortune for it. As for the ID unit, it is a burned chip that is not really
available. I would suggest an after market one.
That is what I know so far...
73
Mike - N7ZEF
----- Original Message -----
From: "Keith Foor" <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: Thursday, November 20, 2008 1:02 PM
Subject: [Repeater-Builder] Information on Spectrum Communications SCR-1000
I have an SCR-1000 that was being used as a local repeater and then
was replaced. I am looking for information on the control circuits,
how to program the IDer, a service and or users manual and any other
info I can find. The unit is VHF (not sure if that matters).
There have been a number of modifications done to this unit that need
to be removed and the unit put back to it's out of box configuration
if possible.
I thank you for any help you may be able to provide.
Keith
KB8VUL
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