[amsat-bb] Re: STRaND1 polarity shift observation
oz1my at privat.dk
Mon Mar 4 08:51:23 PST 2013
You can experience the same effect from SO-50 when using circularly
polarized antennas on ground.
SO-50 also have linear antennas for the FM repeater.
I must change between RHCP and LHCP to get maximum signal during a pass.
Sometimes the difference is from zero to a very good signal.
I think it is interaction between the antennas and the rest of the structure
of the satellite combined with the passive attitude control and the angle
you see the satellite in.
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af Ken Swaggart
Sendt: 04 March 2013 17:03
Til: i8cvs; Amsat - BBs
Emne: [amsat-bb] Re: STRaND1 polarity shift observation
Thanks for sending the K4KJ article.
However my question was why does STRaND1, which only has a whip antenna,
sometimes appear to exhibit circular polarity characteristics? I would
expect a whip antenna transmitting from space to have the same signal
strength on the ground using either RH or LH polarity on my receiving
Sent: Monday, March 04, 2013 00:42
To: Ken Swaggart ; Amsat - BBs
Subject: Re: [amsat-bb] STRaND1 polarity shift observation
Hi Ken, W7KKE
The answere to your question is clearly described into the zipped article
"Circular Polarization" by K4KJ, 5 MB long that I have sent to you in
a separate email.
----- Original Message -----
From: "Ken Swaggart" <k.swaggart at charter.net>
To: <amsat-bb at amsat.org>
Sent: Monday, March 04, 2013 5:10 AM
Subject: [amsat-bb] STRaND1 polarity shift observation
> During my last pass at 0332Z, max elevation 45 degrees out over the
> I noticed that STRaND1 was stronger when I selected LHCP while approaching
> TCA. After TCA, RHCP was stronger while it was receding. I believe this
> cubesat uses a whip, so not sure what is causing this.
> Anyone have an idea why?
> Ken, W7KKE
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