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

[Robert McGwier]

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
> > _______________________________________________
> > Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> >
>
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>



-- 
Bob McGwier
ARS: N4HY