[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: recent AO-40 efforts?



Interesting the speculation, this spacecraft suffered an onboard explosion 
that rendered several transponders inopperative. Was it a short or an open? 
leaky batteries and corossion, who knows? many efforts were made to resume 
contact and all failed. Everyone of us wishes it would return, but the 
chance of that happening is well beyound the point of diminishing returns. 
If someone has time to listen lets not discourage them , but offer no 
encouragement either. Their efforts might be better spent on SETTI.
Art, KC6UQH
----- Original Message ----- 
From: <w7lrd@comcast.net>
To: <kd6ire@sbcglobal.net>; <AMSAT-BB@amsat.org>
Sent: Sunday, March 02, 2008 1:10 PM
Subject: [amsat-bb] Re: recent AO-40 efforts?


> Just dreaming-It's the year 2035 and 90 year old W7LRD, heard AO-40 for 
> the first time in over thirty years.  Using very antique equipment, that 
> was not controled by mental telepathy.
> 73 Bob
>
>
> --
> "if this were easy, everyone would be doing it"
>
> -------------- Original message -------------- 
> From: "Don Ferguson" <kd6ire@sbcglobal.net>
>
>> Auke de Jong,
>>
>> I believe AO-40 was designed by AMSAT to not allow both sets of batteries 
>> to
>> be disconnected. We should have learned with AO-7 that every satellite
>> should be able to work on solar power alone as eventually all batteries 
>> will
>> fail. It is my understanding that the only chance we have is if the
>> batteries burn open some day in the future.
>>
>> Someone else my be able to correct my understanding if I have 
>> misunderstood
>> the AO-40 design. Hopefully those who designed the power system have 
>> moved
>> on and we now have some better insight.
>>
>> Don
>> -----Original Message----- 
>> From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On
>> Behalf Of Auke de Jong, VE6PWN
>> Sent: Saturday, March 01, 2008 7:53 PM
>> To: AMSAT-BB
>> Subject: [amsat-bb] recent AO-40 efforts?
>>
>> I noticed that during the last period of documented efforts to recover 
>> AO-40
>> 4 years ago, there were promising results about hearing faint signals. By
>> my interpretation of those old reports, they basically confirmed that the
>> command receiver was working but could not get much else done with it. 
>> Now
>> that it has been officially silent for several years, has anyone tried to
>> send commands to it in order to disconnect the (shorted) battery banks 
>> via
>> the relays onboard? Given the changing sun-angles on the arrays and the
>> passage of time, as well as possible heating of certain onboard 
>> components
>> due to the constant supply of solar power to the shorted batteries, could
>> there be any possibility of (energizing) the battery-disconnect relays? I
>> presum e that they are in a fail-close arrangement, because if they were
>> fail-open, they should have already done-so due to the shunted power 
>> system.
>> Also, could the solar panels have fuses that have opened? could such 
>> fuses
>> be re-settable?
>>
>> I would be interested to hear what knowledge there exists about the 
>> present
>> status of AO-40, especially what "google" couldn't fetch.
>>
>> Auke de Jong
>> VE6PWN
>> DO33go
>> Edmonton, AB
>>
>> _______________________________________________
>> Sent via AMSAT-BB@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-BB@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-BB@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-BB@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



AMSAT Top AMSAT Home