The idle marker tone system was designed for wirelines
and adapted to microwave shots.
But there are ways around it. The simple method:
Have a local 1950 oscillator at the voter site. It can be done
with a 88mh toroid, a few resistors and caps, and a single
transistor.
Have a SPDT reed relay driven by the link receiver RUS (or COR).
Links can be on 420Mhz, 438-439Mhz, 900Mhz, or 1200 Mhz.
The NC contact on the relay has 1950hz. NO contact has link
receiver audio. Armature feeds voter card audio input.
When channel is idle, card sees 1950hz and is happy.
When channel is unsquelched card sees link receiver audio
and votes.
Reed relays last a long time - I've had used ones last 12 years,
and new ones last 20, but you can use CMOS audio switches if you
want.
The GE voter performance has the Doug Hall beat hands down.
Documentation on both vintages of the GE voter (grey paint is
early, black paint is late) is on the GE LBI page at repeater-builder.
Mike WA6ILQ
At 07:34 PM 07/25/10, you wrote:
I'm in the exact same boat working on a remote receiver. I don't
want the link keyed 24-7 either. I now there are some voters out
there that don't require 1950hz and some that don't need it present
100% of the time to keep that voter port active. But are there any
other voters in the used or DIY market that's in the HAM budget.
That do not require the 1950hz tone at all. Here one I found on RB
but I will need eventually 3 ports.
<http://www.repeater-builder.com/rbtip/wb2whc.html>http://www.repeater-builder.com/rbtip/wb2whc.html
Can one more port be added and has anyone had good success with this unit?
Thanks All,
Ross kc7rjk
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Tim - WD6AWP
Sent: Sunday, July 25, 2010 3:19 PM
To: [email protected]
Subject: [Repeater-Builder] Recommendations for a Voter Link
I'm going to start working on building a link for a remote receiver.
I already have a voter and I'll be using a VHF Micor receiver strip
for the remote.
A couple of mobiles that tune down to 420 might be good as I don't
have a lot room. I'm thinking the link transmitter will be keyed
7x24 with tone signaling. However the duty cycle requirement is a
problem for mobiles. A microwave system might be possible if I knew
what and where to get. Wireline is probably out.
I'd like to hear your ideas on how to put this together.
Thanks,
Tim
P.S. Sorry if this post is a dup. The first one did seem to come
through this morning.
