[amsat-bb] Re: Eagle and AO40
John B. Stephensen
kd6ozh at comcast.net
Sat Feb 24 13:04:04 PST 2007
I wouldn't call Eagle another AO-40. Eagle has an AO-13-like linear
transponder plus a new transponder that will allow the use of smaller ground
station antennas. AO-40 attempted to solve the antenna problem by making a
higher power 1980-technology linear transponder whose transmitters then
failed. Eagle is much more conservative by using linear transponder power
levels more similar to AO-13. The new transponder will make use of modern PC
technology in the ground station to allow the use of lower RF power levels.
The explosion of the AO-40 rocket engine was due to procedure rather than
technology. AO-10 and AO-13 had the same engines. The same human error won't
be made again.
----- Original Message -----
From: <jim at beeson.cc>
To: <AMSAT-BB at amsat.org>
Sent: Saturday, February 24, 2007 18:07 UTC
Subject: [amsat-bb] Eagle and AO40
>I am curious at the thoughts of current satellite users. As I read the
>AMSAT Journal and see the progress of the Eagle Project, it reminds me of a
>few years ago when another "do it all" satellite was being planned - AO40.
>Amateurs are pumping thousands of dollars and time into this project. I
>remember I followed AO40 with great excitement, not to mention spending a
>few grand upgrading my station to be ready for this "super bird". And
>after all the things that went wrong after the launch, I thought - never
> So my question is basic: why spend all this money and wait years for
> something that might end up another catastrophe? Why do we have to try
> and design a bird that does it all? We all know the more complex the bird
> the more room for failure. Why not just pop out another AO13 - or
> similar? I can't tell you how many hours of fun I had with RS10/11. And
> with the way things are in amateur radio now, who knows if there will be
> anybody even interested in this by the time Echo finally is useable.
> Just a thought. I would like to hear yours now please.
> Jim Beeson
> Sent via AMSAT-BB at 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
More information about the AMSAT-BB