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
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
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 [email protected]. 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
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: [email protected] [mailto:[email protected]] 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 [email protected]. 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 [email protected]. 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
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 < [email protected]> 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: [email protected] [mailto:[email protected]] 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 [email protected]. 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 [email protected]. 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 [email protected]. 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
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: [email protected] [mailto:[email protected]] On Behalf Of Robert McGwier Sent: Thursday, August 04, 2011 2:58 AM To: [email protected] 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 < [email protected]> 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: [email protected] [mailto:[email protected]] 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 [email protected]. 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 [email protected]. 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 [email protected]. 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 _______________________________________________ Sent via [email protected]. 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
On 8/3/11 9:28 PM, 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.
Now *THIS* is the best news I've heard all day since the deployment and initial reception reports!!
Perhaps the transponder is disabled in low-power mode during night passes?
Remember this spacecraft is carrying a silver-zinc battery. While nominally rechargeable, this type of battery has a very short cycle life usually specified in the single digits. This is the reason for the conservatism in eclipse operation. Without that battery, the computer will regularly reset in eclipse and the spacecraft won't behave nearly as well as we'd like.
Hi Phil,
The transponder is on in low-power mode while the telemetry beacon is on. You only get 30-40 seconds at a time but if you are quick, you should be able to make a short contact.
The BPSK seems to be working very well - Thank you for all your work!
73, Tony AA2TX --- On 8/4/2011 2:27 AM, Phil Karn wrote:
On 8/3/11 9:28 PM, 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.
Now *THIS* is the best news I've heard all day since the deployment and initial reception reports!!
Perhaps the transponder is disabled in low-power mode during night passes?
Remember this spacecraft is carrying a silver-zinc battery. While nominally rechargeable, this type of battery has a very short cycle life usually specified in the single digits. This is the reason for the conservatism in eclipse operation. Without that battery, the computer will regularly reset in eclipse and the spacecraft won't behave nearly as well as we'd like.
Sent via [email protected]. 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
participants (6)
-
Andrew Glasbrenner -
Anthony Monteiro -
David Barber -
Phil Karn -
Robert McGwier -
Stephen E. Belter