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.

73" de

i8CVS Domenico

----- Original Message ----- From: "Joe v Murray" k0vty@juno.com To: gary.reed@sbcglobal.net; amsat-bb@amsat.org Sent: Friday, June 11, 2010 2:42 AM Subject: [amsat-bb] Re: [Mw] Fwd: Power splitters-errors circularpolarization?

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?

Thanks

Joe Murray K0VTY

On Thu, 10 Jun 2010 17:24:55 -0700 (PDT) Gary K Reed gary.reed@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