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@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@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@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@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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