On Sun, 13 May 2012 20:13:40 +0200, Bob- W7LRD [email protected] 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
Seattle
----- 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 satellites? 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 are 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.