[amsat-bb] AO-85 COR mode

Patrick STODDARD (WD9EWK/VA7EWK) amsat-bb at wd9ewk.net
Mon Nov 9 03:55:11 UTC 2015


Sorry for the tardiness in this post to the AMSAT-BB list. I heard you and
KO4MA talking during the 1715 UTC AO-85 pass this morning. I was listening
with my SDRplay receiver, HDSDR software, and Elk log periodic out in my
yard. I made an RF recording with HDSDR, and posted the RF recording where
you two were testing the satellite (along with the RF recording from the
1855 UTC AO-85 pass, and other files related to these two passes) in my
Dropbox space at:


Look for the 20151108 folder with the name ending in DM43 to get to these

Late in the 1715 UTC pass, I saw and heard AO-85 change back to the normal
mode with the FM transponder with slow-speed telemetry. I did not run
FoxTelem in real time during the pass, but made sure to run my RF recording
through FoxTelem after the pass to get the data I received up to the AMSAT
server. It was easy to see in the HDSDR waterfall the difference between
the normal mode with telemetry and the COR mode without any telemetry -
especially how the downlink transmitter ramps up to the nominal downlink
frequency, every time it fires up.


Twitter: @WD9EWK

On Sun, Nov 8, 2015 at 4:32 PM, Jerry Buxton <n0jy at amsat.org> wrote:

> Thanks for the reports James, Alan, Dani.
> Please let us know via -bb what your experience is if you caught AO-85
> on this current orbit 443.  We will do another test over the U.S.
> beginning about 17:15 UTC.
> We had some competition that affected our low power testing during this
> first pass.  The longer it takes us to test, the longer it will be
> before AO-85 is commissioned and we can turn it over to Operations for
> scheduling.  We are trying to characterize the uplink sensitivity, and
> can't do that if other stations are trying to use the bird causing QRM.
> Thank you.
> Jerry Buxton, NØJY

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