[amsat-bb] AO-85 telemetry hints

Patrick STODDARD (WD9EWK/VA7EWK) amsat-bb at wd9ewk.net
Fri Oct 9 17:11:45 UTC 2015


Since the FUNcube Dongle Pro+ appears as a sound device to
Windows, you can have two programs connect to it at the
same time - provided they use the same LO/center
frequency and input bandwidth settings.

Chris confirmed via e-mail last night that the FoxTelem
software uses 192 kHz bandwidth from the FUNcube dongle.
With this information, I set HDSDR's LO frequency to be
145.960 MHz (a little below the 145.980 MHz downlink
frequency), and used this frequency as the center
frequency in FoxTelem. I set the Input Bandwidth in HDSDR
to be 192000, to match what FoxTelem expects to see. I
found that I had to start HDSDR first, and then start
FoxTelem, so both programs could access the dongle. Then
I didn't have to use a virtual audio cable (or, for some
Windows 7 and older PCs, the Stereo Mix audio device that
does the same thing) to pipe audio from HDSDR to FoxTelem.
Each program can then do what you want - in my case, HDSDR
wrote an RF recording, while FoxTelem decoded telemetry.
You can also mute the audio from either program, so you
aren't listening to the same audio from both programs
(HDSDR has a Mute button on the screen, and FoxTelem has
a Silence Speaker button).


Twitter: @WD9EWK

If you use a program like HDSDR, then you can also feed the IQ audio to
> FoxTelem rather than the decoded audio.

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