[App_rpt-users] Hamtronics receiver issue with AllStar RTCM

Mon Mar 28 17:54:59 UTC 2016

Here is the schematic of the hamtronics output:
amsatnet.info/r303out.png

Isn't R34 and C44 a lowpass??

On Mon, Mar 28, 2016 at 11:51 AM, Skyler F <electricity440 at gmail.com> wrote:

> I think normal would be disc., the only other display is deemphasized and
> CTCSS filtered
>
> On Mon, Mar 28, 2016 at 11:36 AM, Steve Agee <n5zua at earthlink.net> wrote:
>
>> For this exercise, audio is either referenced as pre-emphasized
>> (discriminator) or de-emphasized (speaker). So, by "normal" do you mean
>> discriminator?
>>
>> N5ZUA
>>
>> On 3/28/2016 12:30 PM, Skyler F wrote:
>>
>> 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>
>>> 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>
>>>> 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>electricity440 at gmail.com
>>>>
>>>
>>>
>>>
>>> --
>>> Skyler Fennell
>>> amsatnet.info
>>> KDØWHB
>>> electricity440 at gmail.com
>>>
>>
>>
>>
>> --
>> Skyler Fennell
>> amsatnet.info
>> KDØWHB
>> <electricity440 at gmail.com>electricity440 at gmail.com
>>
>>
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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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