[amsat-bb] Re: Circular polarization
sats at pe1rdw.demon.nl
Sun May 13 11:44:00 PDT 2012
On Sun, 13 May 2012 20:13:40 +0200, Bob- W7LRD <w7lrd at comcast.net> wrote:
> Agreed... occasionally, sometimes left, right, vertical or horiz will be
> best. Then is that for the up or downlink ? Essentially I have
> discovered it is a crap shoot. Whatever works at any given moment may
> not work (that well) a few minutes later. I believe Domenico had a
> scheme for switching any of the four. These uncertainty's make it fun.
> still rebuilding all antennas
> 73 Bob W7LRD
> ----- Original Message -----
> From: " Ib Christoffersen " <oz1my@ privat . dk >
> To: "David 4X1DG" <4x1dg@ iarc .org>, amsat -bb@ amsat .org
> Sent: Sunday, May 13, 2012 10:44:55 AM
> Subject: [ amsat -bb] Re: Circular polarization
> Hi David,
> The short answer is NO.
> But there are more to it than that :-)
> I think I still have an article about that if you are interested.
> 73 OZ1MY/ Ib
> ----- Oprindelig meddelelse -----
> Fra : amsat -bb-bounces@ amsat .org [ mailto : amsat -bb-bounces@ amsat
> .org] På vegne
> af David 4X1DG
> Sendt : 13 May 2012 18:31
> Til: amsat -bb@ amsat .org
> Emne : [ amsat -bb] Circular polarization
> Is a UHF circular polarization antenna needed for the current operational
> I am planning some work on my antenna system and wonder if the CP
> is needed, or actually, deteriorate the signal by 3dB if the satellites
> using linear antennae??
The best option would probably be a rotatable antenna, a sat will never be
fully horizontal vertical or circular, sometimes it even makes a
difference when you flip 180 degrees.
73 Andre PE1RDW
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