Bill, I did not observe the 17:48Z pass. DJ8MS reports that the satellite got much weaker at 17:58Z (http://aar29.free.fr/sat/ao7/ao7log.php).
It apparently shut down at 19:45Z on the second pass. If it simply got much weaker as observed on the prior orbit, I could not hear it. Right before it shut down, I observed KB1RVT's signal start to FM while the transponder's noise floor was modulated by a strong CW signal in the passband. I replied to him and that was the last I heard of it. I'll be on next orbit around 21:28Z. Hopefully it stays on the whole pass. 73, Paul, N8HM On Mon, May 26, 2014 at 4:08 PM, Bill Bordy, NJ1H <[email protected]> wrote: > Is it just me or did AO-07 shutdown today after working for a few minutes? > > The passes I observed this on were: > > 26 MAY 2014 17:48 - 18:04 UTC > 26 MAY 2014 19:37 - 19:57 UTC This pass in particular was a Max El of 59 > for me. > > at my QTH in FN42. > > 73, > Bill > NJ1H > > > > On 5/25/2014 2:42 PM, PY5LF wrote: > >> Paul >> On this pass , finishing 18:43UTC , AO7 works all the time ! >> 73 >> >> PY5LF >> Luciano Fabricio >> Curitiba-PR-BR GG54jm >> http://www.qrz.com/db/PY5LF >> >> -----Mensagem original----- >> De: [email protected] [mailto:[email protected]] Em >> nome >> de Paul Stoetzer >> Enviada em: domingo, 25 de maio de 2014 12:49 >> Para: [email protected] >> Assunto: [amsat-bb] AO-7 Recent Behavior >> >> Good morning, >> >> AO-7 seems to be showing some odd behavior. For about three weeks of the >> eclipse cycle, it had been operating perfectly in Mode B with strong and >> clear signals on each and every pass. However, yesterday it was off during >> two ascending passes over the United States. It was back in Mode B during >> a >> pass over the Western United States around 23:30Z last night. >> >> PY5LF reported that it was in Mode B for 5-6 minutes after leaving eclipse >> and then it abruptly shut off. Reports from Europe on the AAR29 log also >> indicate it had shut off on ascending passes. >> >> My theory is that the sun angles on the solar panels are not ideal at this >> point. When it powers up after eclipse in Mode B, voltages fall such that >> the undervoltage detector kicks in and switches the satellite to Mode D >> (both transponders off). The satellite would then stay in Mode D until it >> loses power on the next eclipse and restarts in Mode B. If this is the >> case, >> my recommendation to Southern Hemisphere stations would be to wait a >> couple >> of minutes after it comes out of eclipse to start uplinking to the >> satellite >> and to keep power levels low until the panels are better illuminated. >> >> This behavior has not been reported on descending passes, though signals >> were reported to be weak and distorted at times this morning over the >> United >> States. Weak and distorted signals on the two meter downlink may be >> partially explained by Sporadic E as six meters has been open most of the >> morning. >> >> 73, >> >> Paul, N8HM >> _______________________________________________ >> 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
