[amsat-bb] Antenna Polarization Question

[Burns Fisher]

Indeed, CP makes sense with a linear tx when you can't tell what the
orientation would be.  You give up a few dB to avoid deep fades.  But I
just can't figure out why you need to switch from RHP to LHP in such
cases.  I've heard a number of people say that it sometimes matters, but I
don't understand the physics!

73,

Burns WB1FJ

On Sun, Mar 18, 2018 at 6:06 PM, Eduardo PY2RN <py2rn at arrl.net> wrote:

> 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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> _______________________________________________
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> expressed
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