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

RE: AO-40 Hi Gain Antenna covers?



I worked in the P3D Integration Lab the week Stan Woods installed those
"covers", and can give you what he told me. The cover, as you call it, is a
special foam that is RF transparent. Its purpose is to prevent visible and
near-visible solar radiation from cooking the center piece with heat. This
was a special concern on all of the parabolic antennas.

Believe me, those covers were installed with the greatest of care.
Measurements were made before and after their installation for RF effect,
which turned out to be practically unmeasurable.

Regards,
Steve Diggs, W4EPI

-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of Stefan Wagener
Sent: Friday, December 29, 2000 8:49 PM
To: amsat-bb@AMSAT.Org
Subject: [amsat-bb] AO-40 Hi Gain Antenna covers?


I have a question for the spacecraft antenna experts.

The following link is to an image right before final assembly. The caption
reads as follows: "The spacecraft is now "armed" and ready for flight.
PAS-1R will be assembled on top of us. It is the last time that we can see
P3-D like this."

http://www.amsat-dl.org/launch/L_image092.jpg

I was just wondering what these yellow covers/plates are for that are
visible on the high gain dish antennas and the feedhorns for the X-band
transmitter. They obviously went up in space like this.

They are not visible during the 1999 assembly/testing in Orlando as shown on
this photo:

http://www.amsat-dl.org/mvc-026l.jpg

Are they part of the antenna design or just covers? Just curious and eager
to learn :-)

Thanks for the input.

73... Stefan



----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home