[App_rpt-users] Hamtronics receiver issue with AllStar RTCM

Skyler F electricity440 at gmail.com
Mon Mar 28 00:35:24 EDT 2016

Hi Bryan, can you send me the exact wiring between your hamtronics and your
RTCM? What value DC blocking capacitor, any jumpers in the RTCM selected


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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