[amsat-bb] Re: SDX works & in the UK

[Stephen E. Belter]

Listening to my HDSDR/FUNcube dongle recording of the 0555 UTC pass of ARISSat-1 from Indiana (EN60), I can clearly copy KO4MA (EL88) calling CQ on the U/v transponder!  The transponder works!

ARRISat-1 was in low-power mode (40 seconds on, 120 seconds off).

73, Steve N9IP
--

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Robert McGwier
Sent: Thursday, August 04, 2011 2:58 AM
To: david.barber at dbelectronics.co.uk
Cc: Amsat-BB
Subject: [amsat-bb] Re: SDX works & in the UK

Congratulations to the entire ARISSAT 1 team.  The spacecraft works, enough said.

When the SDX was dreamed up we were thinking P3E, but I don't care when it was flown or whose design it was,  the reasons for the concept have now been
clearly demonstrated.   On ARISSAT 1, we have several different waveforms
and a transponder all successfully executed in a transponder with IF interface derived from the Flex Radio SDR-1000 (QSD and QSE).  The experiment has shown that you can, in software, on a very small microprocessor accomplish the complex set of operations to generate several waveforms,  add them up, send them to a D/A and allow it to be the baseband excitation  of a transmit chain.  HIP HIP HOORAY for the job well done by the ARISSAT SDX software team.

This is overall, a job well done.  All of us would have preferred to have P3E in orbit now, generating the finest ever HELAPS based transponder, but again, using the QSD/QSE from Flex (as adapted by Howard Long).

Congrats to Drew on apparently being the first (on purpose) 70cm photons through the thing and good going David.

Bob
N4HY


On Thu, Aug 4, 2011 at 2:25 AM, David Barber < david.barber at dbelectronics.co.uk> wrote:

>
> Latest UK pass 06.08utc could just hear my own CW using 50W to a collinear.
>
> Excellent!
>
> No go with SSB though but hardly surprising I suppose given my antenna.
>
> David
> G8OQW
>
> ********
>
> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] 
> On Behalf Of Andrew Glasbrenner
> Sent: 04 August 2011 07:03
> To: Amsat-BB
> Subject: [amsat-bb] Re: SDX works
>
> Still works on 0550Z pass, but just me on. Off to bed.
>
> 73, Drew
>
> On 8/4/2011 1:26 AM, Andrew Glasbrenner wrote:
> > On 8/4/2011 12:28 AM, Andrew Glasbrenner wrote:
> >> I was able to hear myself with as little as 1 watt on the 0425Z pass.
> >> Antennas are a M2 CP42 on RHCP up, and a 10 element horizontal yagi 
> >> down. Sounded VERY good, and cycled on and off with the telemetry. 
> >> I also managed to grab 2 frames of tlm right after AOS. I have a 
> >> wav file of the transponder test.
> >>
> >> 73, Drew KO4MA
> >>
> > Video, well, audio with a picture, here:
> > http://www.youtube.com/watch?v=0AFyZNAbOeA
> >
> > 73, Drew KO4MA
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--
Bob McGwier
ARS: N4HY
_______________________________________________
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