[App_rpt-users] Hamtronics receiver issue with AllStar RTCM

Skyler F electricity440 at gmail.com
Sun Mar 27 19:33:36 EDT 2016

My scope does not really work very well anymore but I'll see if I can get a
P-P reading. What value cap should I put on the discriminator line?


On Sun, Mar 27, 2016 at 5:08 PM, Bryan Fields <Bryan at bryanfields.net> wrote:

> On 3/27/16 5:12 PM, Skyler F wrote:
> > For a voter project, we got the hamtronics VHF receiver pretuned to the
> > repeaters input frequency. The idea is to use hamtronics receivers for
> > every voted receive site for equivalent audio characteristics.
> > So... I hooked a cheap sound card up to audacity, and took a look at the
> > spectrum of each receiver. The hamtronics obviously looks like it lacks
> > high frequency noise on the discriminator output.
> > Does anybody else have experience with hamtronics receivers?
> Yes, I have a number of them in place and find they work perfectly with the
> RTCM.  It can give about 2v P-P on the discriminator pin, and has the high
> frequency compute the RTCM squelch needs.
> My prime setup is here:
> http://gallery.keekles.org/d/28384-2/0330141929a.jpg
> Note you'll want to put a cap in line, as the discriminator is DC coupled
> in
> the hamtronics.  Can you put a scope on the discriminator line and measure
> the
> voltage?  You might have a problem with the receiver.
> 73's
> --
> Bryan Fields
> 727-409-1194 - Voice
> 727-214-2508 - Fax
> http://bryanfields.net
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Skyler Fennell
electricity440 at gmail.com
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