[amsat-bb] Re: [Mw] Fwd: Power splitters-errors circularpolarization?
domenico.i8cvs at tin.it
Thu Jun 10 19:53:58 PDT 2010
Hi Joe K0VTY and Gary WE9Y
In a separate email I have sent to both of you few photograph of my lab
set-up for circularity measurements using a rotating dipole against a LHCP
steady 3.5 turns helix feed for 2400 MHz under test.
Also I have added the radiation diagram for a G3RUH type patch feed for
2400 MHz made with the same set-up when the patch is azimutally rotated
by +/- 90° and is illuminated by the steady horizontally polarized dipole.
If someone is interested to see the above set-up for microwave please let me
know off line.
----- Original Message -----
From: "Joe v Murray" <k0vty at juno.com>
To: <gary.reed at sbcglobal.net>; <amsat-bb at amsat.org>
Sent: Friday, June 11, 2010 2:42 AM
Subject: [amsat-bb] Re: [Mw] Fwd: Power splitters-errors
> Hi Gary
> Any good suggstions on how to keep the axis of the rotating dipole
> lined up with the axis of the CP antenna in the far field?
> Joe Murray K0VTY
> On Thu, 10 Jun 2010 17:24:55 -0700 (PDT) Gary K Reed
> <gary.reed at sbcglobal.net> writes:
> > To measure axial ratio, why not rotate a dipole in front of the yagis
> > (or other antenna) , and measure the signal strength. If the axial
> > ratio is 1 then there should be NO change in signal strength as the
> > dipole is rotated. It would necessary to stay in the far field.
> > Or have I been working too long today?
> > Gary WE9Y
More information about the AMSAT-BB