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

[Burns Fisher]

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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