[amsat-bb] Re: Antenna Polarization Question

[i8cvs]

----- Original Message -----
From: "Thomas Doyle" <tomdoyle1948 at gmail.com>
To: <amsat-bb at amsat.org>
Sent: Saturday, September 15, 2012 8:47 PM
Subject: [amsat-bb] Antenna Polarization Question

> I was listening to a couple of guys on FO-29 having a nice chat about
> satellite antenna polarization. They were trying to figure out what
> type of polarization FO-29 used. They looked at the picture of FO-29
> on the AMSAT web site and decided that it was not circular. Someone
> told me that it was circular so I started looking for information.
> Found this page by WD0E which is quite nice.
>
> http://www.amsat.org/amsat-new/information/faqs/pswitch.php
>
> Is there a more current page that contains this type of information.
>
> tnx W9KE Tom Doyle

Hi Tom, W9KE

For the antenna polarization of FO-29 please read belove:
-------------------------------------------------------
AMSAT NEWS SERVICE BULLETIN 254.S1
FROM AMSAT HQ SILVER SPRING, MD, September 10, 2012
TO ALL RADIO AMATEURS
BID: $WSR-254.S1

FO-29 JAS-2
Catalog number: 24278
Launch Date: August 17, 1996

Mode and Antenna Polarization:
V: RHCP
U: RHCP
--------------------------------------------------------
i8CVS Note:

Following my experience on FO-29 I can add the information
belowe:

FO-29 is RHCP circularly polarized  both in uplink and downlink
and has a fixed sense both up and down, but because of its orbit 
geometry and motion, continuously good signals through it for an
entire pass can only maintained if the antennas ground station sense
is switched, RHCP to LHCP and vice versa in 70 cm and 2 meters
usually several times and on both uplink and downlink and so 
polarization switching relays on board of both up and down antennas
are recommended. 

Read please my articles about polarization switching published on
the AMSAT-Journal March/April 2007 and May/June 2007  

73" de

i8CVS Domenico