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R: Polarity mismatch question?



Hi All,

For polarization profiles of the AO40 antennas read
The Amsat Journal March/April 1993 the following article
by Stan Wood, WA4NFY and Dick Jansson, WD4FAB

"AMSAT Phase 3D Antenna Designe Review
  Phase 3D HF/UHF/Microwave Antennas "

pagg 18-22

73" de i8CVS Domenico

----- Original Message -----
From: Scott Townley <nx7u@arrl.net>
To: AA2AE <aa2ae@optonline.net>
Cc: <amsat-bb@amsat.org>
Sent: Thursday, August 29, 2002 5:07 AM
Subject: Re: [amsat-bb] Polarity mismatch question?


> Well, it depends :-)
> At zero squint, assuming the AO-40 U-band array has a decent axial ratio
> (have no idea what it is), you should (if you're really CP) get at least
> 10dB, and generally more along the lines of 20dB difference.
> AT high squints like most of the time now, the axial ratio of the AO-40
> U-band array is going to be poor, so you will see less of an effect going
> between CP states on the ground, even if you're perfect on the ground.
>
> But it's a good question:  does anyone know the polarization profile of
the
> U-band array?
>
> At 21:55 2002-08-28 -0400, you wrote:
> >Group
> >
> >Just checked my polarity switch on my 70cm KLM 40CX and now the relay
seems
> >to be working ok - I can hear the click.
> >
> >Question - when working AO-40, and switching to LHP instead of RHP,
> >shouldn't the polarity mismatch cause a dramatic change on the downlink?
I
> >understand it to be 20db?
> >
> >Tony - AA2AE
> >
> >
> >
> >
> >
> >----
> >Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> >To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
> ------------
> Scott Townley
> nx7u@arrl.net
> Gilbert, AZ  DM43di
>
> HF/VHF/UHF/Satellite MOBILE station
> --> yet NEWER (August 2002) address http://members.cox.net/nx7u
>
> ------------
> "When the Going gets Weird, the Weird turn Pro"
> Raoul Duke, Sportswriter
>
> "Don't worry Boys, we'll weather this Storm of Approval
> and come out as Hated as Ever"
>
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org


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