[App_rpt-users] Hamtronics receiver issue with AllStar RTCM

Skyler F electricity440 at gmail.com
Sun Mar 27 19:07:59 EDT 2016


Because the Denver Radio club wants to


On Sun, Mar 27, 2016 at 5:05 PM, Kirk Just Kirk <wb6egr at gmail.com> wrote:

> Honestly.....With $25 Maxtracs all over the place.......why.....WHY would
> you want to screw around with anything Hamtronics makes....seriously.....
>
>
>
> On Sun, Mar 27, 2016 at 3:23 PM, Tim Sawyer <tisawyer at gmail.com> wrote:
>
>> Try adding JP1 in the RTCM. This gives some gain to the squelch noise amp.
>>
>> If that works you'll want to turn on the RTCM's BEW (#17 on the main
>> menu). If it's not on that menu you'll need to download the proper firmware
>> and upgrade. This help radios with low out of band discriminator noise not
>> false the squelch on voice peaks. There 3 settings 0) off, 1) on, and 3) on
>> with more aggressive locking.
>>
>> But first make sure you can calibrate the squelch with JP1 in. Otherwise
>> your SOL and there's no reason to upgrade. In that case you'll have to buy
>> some other radios for your voters.
>>
>>
>> On Sun, Mar 27, 2016 at 2:12 PM, Skyler F <electricity440 at gmail.com>
>> 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.
>>>
>>> http://www.hamtronics.com/r303.htm
>>>
>>> When hooked up to the discriminator on the hamtronics board, I could not
>>> get the RTCM to calibrate squelch. It usually told me the audio was too low
>>> weather the RX level was bumped up or down. I then hooked it up to a
>>> motorola SM50 and it calibrated shortly after adjusting RX levels.
>>>
>>> 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.
>>>
>>> Here is the SM50 discriminator out:
>>> amsatnet.info/SM50.png
>>>
>>> Here is the hamtronics discriminator out:
>>> amsatnet.info/HAMTRONICS.png
>>>
>>> Here is an audio sample comparing them (you can probably guess which
>>> radio is first):
>>> amsatnet.info/Sm50_hamtron_DISC.wav
>>>
>>> Does anybody else have experience with hamtronics receivers?
>>>
>>> Thanks,
>>> Skyler KD0WHB
>>>
>>>
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>>
>>
>>
>> --
>> --
>> Tim
>>
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>
>


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