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

[Scott]

My goof - that's exactly what it was.  Didn't recall that from the past but
I don't think I've ever monitored a pass before with so little voice
traffic.  Thinking back, every single pass that I downloaded telemetry from
in the past was nearly full of voice traffic.

Thanks!

On Sat, Dec 26, 2015 at 11:14 PM, Burns Fisher <burns at fisher.cc> wrote:

> One comment about the "constant carrier".  Remember that with FM, there
> *is* a constant carrier as long as "PTT" is "pressed".  And on AO-85 the
> carrier stays on for 30 seconds after the last time it heard a 67-Hz tone.
> And in addition, there is no squelch on the receiver (for the same reason
> you turn squelch off when listening on the ground---to be able to pick up
> weak signals better).  So I wonder if you hear the carrier still on and
> repeating noise from the the uplink when no one was talking?  That is a
> pretty wide use of spectrum because it is pretty loud.
>
> 73,
>
> Burns W2BFJ
>
> On Sat, Dec 26, 2015 at 11:06 PM, Scott <scott23192 at gmail.com> wrote:
>
>> 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.
>>
>> Thanks!
>>
>> -Scott,  K4KDR   FM17es
>> Montpelier, VA  USA
>>
>> On Fri, Dec 25, 2015 at 12:59 PM, Mark L. Hammond <marklhammond at gmail.com
>> >
>> wrote:
>>
>> > 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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>> > expressed
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>> >
>> _______________________________________________
>> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership.
>> Opinions expressed
>> are solely those of the author, and do not reflect the official views of
>> AMSAT-NA.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
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>
>