[amsat-bb] Re: AO-07 orbit 50159
archie.hackett at hotmail.com
Sat Sep 8 10:56:27 PDT 2007
A pleasure to 'meet' you and have the opportunity to thank you for confirming mode-B for AO-7's orbit 50159.
Very much appreciated Allen.
I'm currently discussing the relays used 31 years ago, with the chief design engineer, J King ... (which are 'latching' and which are not) ... since, as I'm sure you're aware, this, together with the illumination could also play a part in the mode on/off/on/off sequence.
Last year, when I first 'tagged' the 24 hour timer the satellite was in constant illumination ... this time, it's a little more 'debatable' ... (different software packages) ... hence this year's musings re: the mode and when it changes.
Last year I established it to be it on or around 08:30 drifting to 09:00. At present, it appears to be 01:45 to 02:00 ... which in itself is rather interesting.
I hope you don't mind me CC'ing this mail to Joe K3SZH, Mak SV1BSX and a few other interested parties.
I'll do my best to keep the log up to date Allen.
Thank you again for your response.
73 John. <la2qaa at amsat6.org>
> Date: Sat, 8 Sep 2007 09:51:23 -0500
> To: la2qaa at amsat.org
> From: afmattis at hal-pc.org
> Subject: AO-07 orbit 50159
> < It would be interesting if you could confirm which mode AO-7 was in at
> 01:28 on orbit 51059 Allen.
> AO-07 was in Mode B. My uplink was 70cm and downlink was 2m. I heard
> myself loud and clear on 145.942 for about 7 minutes. I also heard a
> little SSB up near 145.953 but didn't listen long enough to get the call
> sign. I had the usual fade out when the bird moved north of me at
> mid-pass. Many of us in the US with omni-directional antennas can only get
> in when the bird is south of us.
> Thank you for the work you are doing to gather data to try to figure out
> the mode change pattern. Also thank you for correcting my entries - I
> usually check my entries and make a correction if needed but we had house
> guests yesterday and I did not have time.
> At 01:33 PM 9/8/2007 +0200, you wrote:
> > I have taken the liberty of correcting your AO-7 log entry on
> > orbit 50159.
> >You entered the mode as 'OFF' but at the same time commented your heard
> >your own downlink ... therefore the mode must have been 'ON' in either A,B
> >or C ... and since the other stations logged in mode-B before and after
> >you heard your downlink I presume the satellite was in mode- B at the time
> >... unless anything untoward was happening.
> >You mentioned ... "called CQ CW 145.942 ... which in fact suggests mode-A
> >between two periods of mode-B on the same orbit. It appears this also
> >happened two days ago, it is quite unusual for AO-7 to switch twice on the
> >same orbit.
> >It would be interesting if you could confirm which mode AO-7 was in at
> >01:28 on orbit 51059 Allen.
> >Thank you.
> >73 John. <la2qaa at amsat.org> AO-7 Resource Page Admin:
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