[amsat-bb] ao 92 fox satellite telemetry reception issue

[Burns Fisher]

Good point, Jean Marc.  Thanks.

And BTW, I of course meant in my original post that most radios do not spec
the LOW frequency of their output.

On Thu, Aug 23, 2018 at 12:58 PM, Jean Marc Momple <
jean.marc.momple at gmail.com> wrote:

> Burns,
>
> Thanks to have put in better words what I was trying to explain, sure it
> will help Shakeel.
>
> I use HDSDR this side and works perfectly.
>
> May be to add on the topic, one may also use the SDR IQ (need to use 192K
> sampling rate).
>
> 73
>
> Jean Marc (3B8DU)
>
>
>
> On Aug 23, 2018, at 8:42 PM, Burns Fisher <burns at fisher.cc> wrote:
>
> Just to add a bit:  I think the discussion got a bit twisted around
> talking about TNCs.  Fox telemetry is NOT AFSK, which I believe TNCs are
> intended to decode.  Since TNCs deal with higher audio frequencies, an
> audio feed to them does not necessarily work for FoxTelem.
>
> What you need is audio out of your radio that does not have low
> frequencies filtered out.   As Zach said, kind of down to 0Hz :-)  The
> problem is that most radios DO filter out frequencies below 200Hz because
> that is where the "subaudible"  CTCSS aka PL tones are.  It might work to
> use the data/TNC output of the radio.  Unfortunately most radios spec the
> high frequency cutoff of their data output but not the high frequency.
>
> As was said earlier, an SDR is a far better option.  Even if you have an
> SDR dongle not supported by FoxTelem, you can use an SDR program like SDR#
> or HDSDR to demodulate, and then feed the unfiltered audio output to
> FoxTelem using something like "Virtual Audio Cable".
>
> 73,
>
> Burns WB1FJ
> Fox Flight Software
>
> On Thu, Aug 23, 2018 at 12:24 PM, Jean Marc Momple <
> jean.marc.momple at gmail.com> wrote:
>
>> Zach,
>>
>> Cannot comment on the IC-9100 as I don’t know this rig. Definitely will
>> not work with the TS-2000 and FT-857 (my rigs).
>>
>> I remember a WEB/ BB feedback on this issue but unfortunately cannot
>> recall/find the link, this is how I learn same. Basically you need to pass
>> on the audio to the TNC and the Fox’es TLM software works at sub-audile
>> frequencies between 10 & 200 hz and your radio should be able to do so.
>> Most rigs does not unfortunately without serious modifications.
>>
>> As mentioned before no issue this side with a SDR, even with the cheapest
>> ones.
>>
>> My one cent input.
>>
>> 73
>>
>>
>> Jean Marc (3B8DU)
>>
>> > On Aug 23, 2018, at 8:00 PM, Zach Metzinger <zmetzing at pobox.com> wrote:
>> >
>> > On 8/23/18 10:33 AM, Jean Marc Momple wrote:
>> >> Shakeel,
>> >> Most commercial radios will not pass-on the telemetry to your TNC for
>> the FOX, I am not sure about the IC-9100, due to the filters in the radio
>> as the TLM are below 200Hz. I had same issue with TS-2000. You should use a
>> SDR instead.
>> >
>> > Jean Marc,
>> >
>> > Doesn't 9k6 need response down to DC? Why couldn't one hook up to the
>> DATA2 jack on the IC-9100?
>> >
>> > Beyond that, the '9100 has a USB port which provides audio I/O to a PC,
>> which is what I think Shakeel is referring to. That might have the same
>> filters as the normal audio jack. A quick test using fldigi and looking at
>> the waterfall will show the approximate filter shape.
>> >
>> > --- Zach
>> > N0ZGO
>> >
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>
>
>