[amsat-bb] Antenna Polarization Question

Sun Mar 18 22:06:39 UTC 2018

Jordan,  most of the amateur radio LEOs SATs today have a linear polarized antenna attached, it is not possible to know which position it is in the time of the pass: H, V, moving, spinning... being completely random to the ground station which polarization the signal will be, for this reason I believe CP is more efficient but with RH/LH switching capability.
73
Ed
PY2RN
      From: Jordan Trewitt <jmtrewitt at gmail.com>
 To: Eduardo PY2RN <py2rn at arrl.net> 
Cc: Brian <cqkg8co at yahoo.com>; "amsat-bb at amsat.org" <amsat-bb at amsat.org>
 Sent: Sunday, March 18, 2018 6:44 PM
 Subject: Re: [amsat-bb] Antenna Polarization Question

Maybe I'm not understanding it, but why does one need to switch between both, unless a particular satellite has LHCP or RHCP?JordanKF5COQ

On Sun, Mar 18, 2018, 16:34 Eduardo PY2RN <py2rn at arrl.net> wrote:

Hi Brian, 
Both. You are going to need to switch between RHCP and LHCP often during a sat pass. The same happens if using linear polarization (V/H) but in this case the switch between V and H will happen much more often than in CP.
73
Ed
PY2RN

      From: Brian via AMSAT-BB <amsat-bb at amsat.org>
 To: "amsat-bb at amsat.org" <amsat-bb at amsat.org>
 Sent: Sunday, March 18, 2018 6:21 PM
 Subject: [amsat-bb] Antenna Polarization Question

Should I be using LHCP or RHCP when setting up the 2 meter and 440 yagi's to work the LEO's.

Thank you

Brian, KG8CO

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