[amsat-bb] Re: AO-07 healthy CW
rwmcgwier at gmail.com
Tue Nov 28 06:26:03 PST 2006
I really want to thank everyone, especially Dick Daniels, for being
the photographic packrats we are. I also want to thank those who have
sent me captions. I will steal Tom's note to make a caption for the
batteries. A lot of new captions will go up this week. I am sure that
this one example shows WHY this kind of photographic history is
important and not just nostalgia. In my case, I have no memory. I
knew I attended the earliest design meeting for AO-40. I did NOT
remember it was the first five!
I have been off for almost two weeks for work and Thanksgiving and I
will be playing catch up now.
Tom Clark, K3IO wrote:
> N4HY sent this note:
>> There was one series string of Nicads as can easily be discerned from
>> this photograph:
>> You can notice the series string starts at the upper left and works its
>> way right and then down to the lower string and back to the left.
> Those are sealed, space-rated NiCd batteries built to NASA's
> specification. The package you see is the flight spare for the Radio
> Astronomy Explorer (RAE) satellites. They originally cost ~$2000 per
> cell. With later satellites, AMSAT found that we could "make our own"
> batteries that were better by carefully screening industrial-grade
> commercial batteries by following a recipe devised by the late Larry
> Kayser VE3QB/VA3LK/WA3ZIA.
> RAE-A = Explorer 38
> launched July 4th, 1968 flew in MEO. This satellite had a a pair of
> Vee-beam antennas which provided gravity gradient stabilization. With
> each Vee-beam being 750' long, the satellite's 1500' total length made
> it the biggest structure put into space. The antenna booms were made of
> flat beryllium copper tape that formed itself into a round tube after
> being unrolled.
> RAE-B = Explorer 49 flew June 15th, 1973 into Lunar orbit
> (http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1973-039A). It
> also had the same long Vee-beam antenna. The very lumpy lunar gravity
> field made for interesting problems with the gravity gradient booms!
> FYI -- I note with some pride that I came to Goddard in 1968 as a staff
> scientist working on RAE-A and then RAE-B. I migrated from low-frequency
> radio astronomy into Pulsar and VLBI work.
> FYI#2 -- In addition to the flight spare batteries, Oscar-8's 10M
> antennas owed their existence to the RAE project.
> 73, de Tom K3IO (ex W3IWI)
AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL,
TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair
"If you board the wrong train, it is no use running along the
corridor in the other direction. " - Dietrich Bonhoffer
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