[amsat-bb] polarity ,movement and lo sat`s

["Chris" <PA5RWE@xxxxxxxxx>]

Gentlemen
It seems i already found all the anwers....
(by trail and error!)
But there seems to be someting not in order
with the url i gave,so for those who want to have a look
at ` magic on the roof `;
WWW.HOTFM@DEMON.NL/loopyagi
or
WWW.LOOPYAGI.DA.RU
and `hit` or `tag` the englisch (or dutch) flag with your mouse.
You will be ammuzed and ammazed.

Greatings
Chris PA5RWE

``Oegh...``
        (Trevor Baylis)

----- Original Message -----
From: "Estes Wayne-W10191" <W10191@motorola.com>
To: <amsat-bb@AMSAT.Org>
Sent: Wednesday, December 05, 2001 9:55 AM
Subject: [amsat-bb] polarity reversal at low elevations


> I think Richard Limebear wrote (it's getting hard to tell now):
>
> Go for RHCP; The only thing you'll lose out on is that, at  > low
elevation > (say below > 10 degrees), signals get > scintillated to the >
opposite sense so an RHCP signal would get turned round ... > but its not >
usually by a complete turn.
>
>
> Wayne replies:
>
> Interesting.  I never knew about polarity reversal at low elevations.  Is
that cause by ground reflection?  If so, it seems odd that the reflected
signal would dominate the non-reflected signal.
>
> I use a RHCP yagi to receive FO29, and the 70cm downlink signal usually
drops off a cliff below 10 degrees elevation.  I never knew why.  I suppose
I might hear wonderfully if I got a polarity switching relay (and a
mast-mounted preamp).
>
> I don't remember 2m downlink signals dropping so dramatically below 10
degrees when using a RHCP yagi to receive AO-10/13 or RS-12 (Mode T).
>
> Wayne Estes W9AE
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