[amsat-bb] AO-73 Telemetry Question

Jerry Buxton amsat at n0jy.org
Tue Aug 12 23:20:22 UTC 2014


I recall in conversation with one of our Fox Team who was using an SDR 
application that MIGHT have been HDSDR, that the I-Q can be inverted.  I 
don't know if it's a setting or what, I don't use HDSDR software and as 
I said I'm not sure he was using HDSDR.  But it might be worth a look to 
see if you have such an option and switch it to see what happens.

Jerry Buxton, NØJY

On 8/12/2014 4:18 PM, Thomas Doyle wrote:
> Hi,
> Recorded an AO-73 telemetry pass (RF recording)  this morning with HDSDR.
> Later fed it from HDSDR into the sound card and then to the FCD Dashboard
> (see pic). It appears the signal is making it to the Dashboard but nothing
> seems to happen. I tired (Auto Tune) on/off, and narrowing the bandwidth of
> the HDSDR filter to better match the bw of the signal but still nothing. It
> does seem to lock on to the (Detected Frequency 2262 Hz) but that's about
> all it does. The Dashboard is brilliant and I would like to get it working.
> Due to deed restrictions no outside antennas are allowed so the signal is
> not that strong here (about 5dB above the noise) and it might never work
> from here. Any suggestions will be appreciated. Any suggestions that we
> move to a new neighborhood that allows outside antennas will be forwarded
> to my wife :-)
> http://www.tomdoyle.org/dashboard1sm.png
> Tnx W9KE Tom Doyle
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