[amsat-bb] AO-85 telemetry hints

Mark L. Hammond marklhammond at gmail.com
Fri Oct 9 14:31:53 UTC 2015

Hello Steve,

The only hardware/SDR supported natively by Foxtelem 1.0 is FCDP or

For other SDRs, you have to use something like SDR#, HDSDR, SDR-Radio V2,
to decode the audio (FM,about 12-15kHz wide,audio filtering OFF); ouput
that audio to a virtual audio cable, then set up Foxtelem to use that
virtual audio cable as input.   It works, both live and with recordings,
both slow and high speed.

I will copy AMSAT-BB since others will ask, too :)


On Fri, Oct 9, 2015 at 10:08 AM, Greene, Stephan A <
stephan.a.greene at vencore.com> wrote:

> Mark:
> Have you tried other SDR than the FCD Pro?  I know the Fox telemetry
> software detects the FCD (it appears in the source pull down menu), I
> haven't figured out how to get it to similarly "see" my SDRPlay.
> With the FCD Pro, did you set the telemetry software to use IQ input or
> audio (your post suggests audio), fast or slow settings?
> Any tricks to using the telemetry software with other SDR software?
> (I've been trying HDSDR so far, I have an older copy of SDR# that should
> still work with my SDRPlay, and SDR-Console works with it, too)  Or do
> you create an IQ recording and just play it back?
> 73 & Thanks!
> Steve KS1G
> -----Original Message-----
> From: Mark L. Hammond [mailto:marklhammond at gmail.com]
> Sent: Friday, October 09, 2015 6:34 AM
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] AO-85 telemetry hints
> Hi All,
> On the 10utc pass this morning, while the transponder was on and in use:
> I learned that reducing the width of the cutoff filter in Foxtelem
> program made it so I could copy the subaudible telemetry packets with
> the Funcube Dongle Pro.  Reducing from the default 200 Hz to about 180
> or 175 seemed to work here.  It shows up as a decent eye pattern after
> that.
> Another FYI-When playing back an IQ recording via SDR#, it seems a bit
> more forgiving, working well around 175-200.
> Suggest folks experiment for best copy! Share hints here, please!
> 73,
> Mark L. Hammond  [N8MH]

Mark L. Hammond [N8MH]

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