[App_rpt-users] Hamtronics receiver issue with AllStar RTCM

Skyler F electricity440 at gmail.com
Mon Mar 28 13:30:11 EDT 2016


Actually, the normal audio output is probably what is needed, not de-emph.
Again with the 10µF capacitor.


Here is my entire output when I get Normal Audio as good as I can get it.
Everything passes except for 3200Hz.

Testing level at 100 Hz for Normal Audio

Testing level at 320 Hz for Normal Audio

Testing level at 500 Hz for Normal Audio

Testing level at 1000 Hz for Normal Audio

Testing level at 2000 Hz for Normal Audio

Testing level at 3200 Hz for Normal Audio

Error -- Measured 10755, should have been between 6929 and 9374

Testing level at 100 Hz for CTCSS Filtered Audio

Error -- Measured 11719, should have been between 100 and 451

Testing level at 320 Hz for CTCSS Filtered Audio

Testing level at 500 Hz for CTCSS Filtered Audio

Testing level at 1000 Hz for CTCSS Filtered Audio

Testing level at 2000 Hz for CTCSS Filtered Audio

Error -- Measured 12326, should have been between 8989 and 12162

Testing level at 3200 Hz for CTCSS Filtered Audio

Error -- Measured 11827, should have been between 6929 and 9374

Testing level at 1000 Hz for De-Emphasized Audio

Error -- Measured 45868, should have been between 9798 and 13257

Testing level at 2000 Hz for De-Emphasized Audio

Error -- Measured 41568, should have been between 4380 and 6155

Testing level at 3200 Hz for De-Emphasized Audio

Error -- Measured 43439, should have been between 2271 and 3073

Testing level at 3200 Hz for Squelch Noise Detector

Error -- Measured 436, 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 264, should have been between 500 and 1023





On Mon, Mar 28, 2016 at 11:22 AM, Skyler F <electricity440 at gmail.com> wrote:

> 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
>



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