Good signals from ARISSat-1 with transistion from eclipse to sunlight here this morning.
Apx. 6 second spin period puts deep nulls in transmitted signal. - Not sure if this is due to linear polarisation of my receive antenna or blockage from spacecraft. Managed to capture just 3 tlm frames and '2 Kursk frames' . (mission time 29997-30018) However, software forwarded zero frames via internet (?).
If recording to a .wav file, CW positioned to be 500Hz seems to work well.
Battery voltage around 33V status - charging.
Thanks
David G0MRF
Just heard the "Hi this is ARISSat" message in English, and then in another language. Very deep fades using my M2 CP antenna (no preamp). The S meter on my FT-847 peaked at 40 dB over S9, but with rapid fades to zero and then back on the approach.
Immediately after the other language message, the carrier shut off, only to come back at the end of the pass, where I heard what appeared to be SSTV, however I didn't record (again), and even if I had, most probably the picture wouldn't have been of much use due to the rapid fades.
I was manually moving my antennas, but watching the azimuth and elevation of the ISS, and with the gain of my antenna, ARISSat at this time appears to still be following the ISS very closely.
73 de Sebastian, W4AS EL95
Hello
Can anyone tell me how to select my dedicated sound card for ARISSat telemetry tool to work ? I have 2 sound cards on my computer and I only use my secondary card for digital communication.
Thank you, Yanko aka NX9G
Yanko - I have multiple sound cards as well --
It appears the program uses the "default" audio devices. I had to designate (using the OS) my radio connected sound as the default device.
This might be a nice enhancement for the next release of the software.
73, Bruce WA3SWJ
At 01:26 AM 8/4/2011, you wrote:
Hello
Can anyone tell me how to select my dedicated sound card for ARISSat telemetry tool to work ? I have 2 sound cards on my computer and I only use my secondary card for digital communication.
Thank you, Yanko aka NX9G _______________________________________________ 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 8:39 PM, [email protected] wrote:
Apx. 6 second spin period puts deep nulls in transmitted signal. - Not sure if this is due to linear polarisation of my receive antenna or blockage from spacecraft.
Since we don't have video of the actual deployment we don't know how it was turning at release.
But remember the physics of this. Any body that isn't absolutely rigid will eventually settle down to a stable spin about the axis with the greatest moment of inertia. That configuration minimizes kinetic energy while still conserving angular momentum.
Although ARISSat-1 doesn't have any nutation dampers that I'm aware of, the slightest flexing of the structure, the antenna (singular), even tiny movements of the cables inside, will dissipate energy and convert any complex tumbling motion into a smooth spin about the preferred axis. That axis includes the antenna, so it shouldn't fade due to spinning.
So it may simply take some time to settle down into a stable spin without frequent deep fading.
Phil
This morning at 04:37 UTC a good pass over Zagreb, Croatia. VHF / UHF linear transponder has worked fairly well. I heard my own signal with the strength 55-56. There is relatively strong noise in the linear transponder receiver. There was no one to answer to my CQ. Received two SSTV images (SSB and FM). The voice messages are of excellent quality. Telemetry is a good all modes (voice, CW and BPSK). See you on ARISSat-1 73 Zeljko 9A2EY
participants (6)
-
Bruce Semple -
g0mrf＠aol.com -
Phil Karn -
Sebastian, W4AS -
Ulip Željko -
Yanko P. Yankov