Hi Piraja and Mike As far I know actually the batteries of AO-7 are an open circuit and this is why the satellite started to work again.
Before for many years AO-7 was silent because the batteries where in a short circuit condition. AO-7 is actually working only when the solar panels are illuminated and so the panels power is managed only by the BCR (Battery Charge Regulator) but the batteries are out of service. Yesterday April 13 during revolution 62037 AO-7 was in Mode-A over Europe and signals where strong and clear without the well know FM-ing normally affecting the Mode-B transponder. 73" de i8CVS Domenico ----- Original Message ----- From: "Mike Rupprecht" <m...@mike-rupprecht.de> To: "'ps8rf Piraja'" <ps...@hotmail.com>; <amsat-bb@amsat.org> Sent: Wednesday, April 14, 2010 6:25 PM Subject: [amsat-bb] Re: AO-7 is not OK Hi Piraja, Yes, I made similar observations. If the CW is active on 70cm you can hear sometimes a very strong deviation in frequency. The CW beacon partly not decodable. I agree with you it could be an effect by low batteries or due heavy usage. See some graphs here: http://www.dk3wn.info/p/?cat=21 73, Mike DK3WN -----Ursprüngliche Nachricht----- Von: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] Im Auftrag von ps8rf Piraja Gesendet: Mittwoch, 14. April 2010 13:22 An: amsat-bb@amsat.org Betreff: [amsat-bb] AO-7 is not OK Some days we are seeing very strange behavior in the AO-7. In some orbits can only hear the feedback on the downlink when the satellite is approaching my station at about 30 degrees elevation, before is impossible to hear any signal via AO-7. Using two pre-amplifier, one in the TS 2000x and the other with 0.6 noise with 20 dB gain. During the orbits we transmiting power with of 30 watts. The satellite does not respond. Tried with 15 watts It was then that we hear at certain points on the downlink audio too low. Its best performance is when the satellite is almost 90 degrees from my station. Yet it seems that the satellite is asking for help. This seems the batteries are not getting enough loads. Or maybe it's excessive use of power by the users of the satellite. Maybe it's time for the users of AO-7 rethink the best ways to keep QSO through it, such as the use of LOW POWER so that over time the satellite is stabilized. "Long live the AO-7" 73' Piraja, PS8RF The Amateur Radio is supportive and helpful in any circumstance. _________________________________________________________________ Você sabia que seu navegador te ajuda a ficar longe de vírus? Leia mais sobre isso. http://www.microsoft.com/brasil/windows/internet-explorer/?WT.mc_id=1500 _______________________________________________ Sent via amsat...@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...@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...@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
