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Annual meeting
Annual meeting in Stockholm.
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AO-40 Update
Hej!
Det finns inte mycket att rapportera om AO40 men en av kontroll stationerna anser sig ha hrt ngot som kan tnkas vara en signal frn AO40.
ls nedan.
***************
Yes, we already thought about this idea.. but the thing
must be reproducable, which seems not to be the case
at the moment.. So we probably have to be more patient.
73s Peter DB2OS
William Leijenaar wrote:
> Hi AMSATs,
>
> Great to hear that at least some signals were heared
> from AO40.
>
> When IHU and the L-Band are working but not the TX
> completely, it is maybe possible to upload a small
> program that measures the battery voltage and sends
> the value back to earth in CW, by just switching
> on/off the TX…
>
> Its at least a small communication :o)
>
> Just an idea…
>
> 73 de LU/PE1RAH
> William in Buenos Aires
>
Klla: amsat
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Vissa livstecken…
Lser fljande p AMSAT-DLs hemsida:
Today during the period 0310 to 0320 UTC (orbit 1541) I observed the following.
Prior to issuing the command sequence we tune around the beacon frequency, taking note of the noise spectrum . No variance in amplitude detected, just clean white noise. At 0310, commenced sending a 12 block sequence, 3 * (Reset,Tx-Off,Reset,Tx-On).
At the completion of the sequence, again tuned around the beacon frequency, and noted a noise peak of 4 to 5 db, in the vicinity of expected beacon frequency. The width of this peak was about 5 kHz. Listened to it for about 15 seconds and then sent a Reset, Tx-Off command and the noise peak disappeared, approximately 2 seconds after the Tx-Off block was completed.
Completed my session with a number of Aux-Batt commands, but did not attempt the Tx again. Range was nominally 12000/15000 kilometres during command period. Was using my last calibrated uplink frequency.
This tends to suggest that the IHU and L Band Rx are operational. Bus voltage insufficient to open that damn relay. Considering SA=-72, the remaining cells are holding up well. Hope this makes your day, like it has mine.
Colin Hurst, VK5HI
for the AO-40 Command Team
Klla: AMSAT-DL
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Echo-uppskjutning försenad
Vi har ntts av beskedet att uppskjutningen av Echo har blivit frsenad:
Due to a delay in the delivery of the primary payload to the launch site, I have been informed that the Launch of ECHO has been delayed by some 3 months. The official launch date is now June 29 2004.
I assume that this new date is the start of the new launch window which may last several weeks. As and when more information becomes available I will keep you informed.
73
Robin Haighton VE3FRH
President AMSAT-NA
Klla: Robin Haighton VE3FRH
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Senaste info om stoppet
Vi kan lsa fljande p AMSAT-DLs hemsida:
—
Parkes 64m Radio Telescope Listens for AO-40
With our attempts to restore AO-40 we have received today significant support from Parkes Observatory in Australia. http://www.parkes.atnf.csiro.au/
The Parkes Observatory is operated by the Australia Telescope National Facility (ATNF) which is part of Commonwealth Scientific and Industrial Research Organisation (CSIRO).
From here were received the live pictures of Apollo 11 Moon landing, 1969. See above homepage of Parkes.
The radiotelescope has a diameter of 64 metres and the system noise figure is approx. 25 K.
From about 6:00 UTC, a 4 MHz wide spectrum with center frequency of 1097 MHz was scanned with high level technique in order to find the LO frequency of the AO-40 L1 receiver. A band of approx. +/- 20 kHz around the actual LO frequency was examined intensively. Three hours were needed to prepare the setup for AO-40 and to search.
Unfortunately nothing was heard which could be a signal of AO-40!!
The fact that nothing was heard of the L1 receiver s LO does not lead to the conclusion that AO-40 is completely dead. The receivers of Parkes are not really fitted for frequencies below 1.25 GHz, and naturally one does not know how good the L1 receiver s LO is shielded or how much of the signal would go through the antenna to the outside world. During the next days more research follows.
The L1 command receiver is continuously switched on, and it would have been good news if we had such a confirmation that the 10 V power source for the L1 receivers is still functioning. All receivers and also the IHU are supplied with the 10 V source.
All command stations are continuing to send commands to the satellite in order to switch the batteries.
I would like to say a great thank you on behalf of AMSAT-DL to Brett Dawson, VK2CBD and the team of Parkes observatory, especially to Dr. John Reynolds (Officer in Charge) and John Sarkissian (Operations Scientist).
Peter Guelzow, DB2OS
President AMSAT-DL
Klla: AMSAT-DL