[amsat-bb] AO-85 high speed data/telemetry testing Dec. 29-30, 2015

Scott scott23192 at gmail.com
Sun Dec 27 04:06:59 UTC 2015

Nice overhead pass of AO-85 just now; decoded 52 packets with v1.03a of
FoxTelem in auto mode.

Question:   Even though I heard a couple of stations attempting to work the
voice transponder, there seemed to be a constant carrier that looked like
data to me.  Quite different from the sub-audio data that I have copied in
the past.   On the SDR waterfall, it occupied maybe 12-15k KHz of the RF
spectrum, I believe.   Has something changed since the last time I
downloaded AO-85 telemetry?  Any idea what I was seeing?  Were BOTH the
voice transponder and high-speed data on at the same time somehow?

IQ recording available if needed.


-Scott,  K4KDR   FM17es
Montpelier, VA  USA

On Fri, Dec 25, 2015 at 12:59 PM, Mark L. Hammond <marklhammond at gmail.com>

> Hello All,
> Greetings.  In an effort to test a new autobaud selection feature in
> FoxTelem 1.03, the Operations Team will be conducting some experimental
> sessions with AO-85 next week (Dec. 29 and 30, 2015).
> Telemetry collectors in/near the US are encouraged to participate and help
> with testing the autobaud selection feature by installing the 1.03 test
> version available here:
> http://amsat.us/FoxTelem/test/
> I suggest you do a clean/fresh install in a new folder so you can always
> go back to 1.02 if you prefer.  (It's possible to upgrade only the new
> files, but if you have to ask how, you'd better not do it ;))
> You'll see a new "Auto" button option, next to the Low and High speed
> buttons; use it.
> Specifically, during the following passes we'll be switching from the
> current voice transponder operation with low speed telemetry, to high speed
> telemetry (Note: in high speed mode, voice operations are OFF).  The
> switches will take place about every minute or two during the pass. Please
> avoid making contacts during these testing periods.
>  29.12.2015  AO-85        11:19 11:32 UTC
>  29.12.2015  AO-85        13:00 13:12 UTC
>  30.12.2015  AO-85        11:45 11:59 UTC
> During 2016, two or three more Fox satellites are planned for launch into
> orbit, and these birds will need to operate in high speed data mode from
> time to time to download space photos, experimental data, etc.  Taking
> advantage of some in orbit testing with Fox-1A/AO-85 will be very helpful
> to the further development of the FoxTelem ground station software.  All
> the thanks go to Chris Thompson AC2CZ for his extraordinary efforts on the
> telemetry software (both client and server side)!
> Feedback about your experiences will be appreciated.  Email to the list is
> preferred so all can learn.
> 73,
> Mark L. Hammond  [N8MH]
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