[App_rpt-users] Hamtronics receiver issue with AllStar RTCM

Skyler F electricity440 at gmail.com
Mon Mar 28 13:22:48 EDT 2016


I added a 10µF electrolytic capacitor in series with the Discriminator
output of my hamtronics, but was still not able to get the squelch
calibrated. Here was the diagnostic output:

Testing level at 1000 Hz for De-Emphasized Audio

Testing level at 2000 Hz for De-Emphasized Audio

Error -- Measured 9581, should have been between 4380 and 6155

Testing level at 3200 Hz for De-Emphasized Audio

Error -- Measured 10030, should have been between 2271 and 3073

Testing level at 3200 Hz for Squelch Noise Detector

Error -- Measured 279, should have been between 0 and 50

Testing level at 6000 Hz for Squelch Noise Detector

Testing level at 7200 Hz for Squelch Noise Detector

Error -- Measured 211, should have been between 500 and 1023

On Sun, Mar 27, 2016 at 10:53 PM, Eric Guth <eric at efratnetworks.net> wrote:

> 10 Uf , 35VDC will usually do the job.
>
>
>
> 73,
>
>
>
> Eric Guth
>
> 4Z1UG
>
> Allstar: 28422
>
> QSO Today <http://www.qsotoday.com/>
>
>
>
> *From:* app_rpt-users-bounces at ohnosec.org [mailto:
> app_rpt-users-bounces at ohnosec.org] *On Behalf Of *Skyler F
> *Sent:* Monday, March 28, 2016 7:35 AM
> *To:* Bryan Fields
> *Cc:* app_rpt-users at ohnosec.org
> *Subject:* Re: [App_rpt-users] Hamtronics receiver issue with AllStar RTCM
>
>
>
> 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 etc...?
>
>
>
> 73,
>
> Skyler
>
>
>
> 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
>
> amsatnet.info
>
> KDØWHB
>
> electricity440 at gmail.com
>



-- 
Skyler Fennell
amsatnet.info
KDØWHB
electricity440 at gmail.com
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