[App_rpt-users] Hamtronics receiver issue with AllStar RTCM

Skyler F electricity440 at gmail.com
Sun Mar 27 19:48:57 EDT 2016


I am getting 2v P-P

On Sun, Mar 27, 2016 at 5:33 PM, Skyler F <electricity440 at gmail.com> wrote:

> 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?
>
> 73
>
>
> 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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