Re: R: [amsat-bb] Cross Boom

[Jon Ogden <na9d-2@xxxxxxxxxxxxx>]

Actually, that's not totally correct.  It has to do with currents and all in
the element tips.

I refer you to WA5VJB's paper and documents on G6LVB's site:

www.g6lvb.com/fibermetalboom.htm

I don't know how many people know Kent, but in the VHF/UHF/Microwave world
on this side of the pond, he's very well respected.  He's done a lot of work
on this sort of thing and his paper shows very clearly how the interactions
work.  That paper explains it a LOT better than I can.

Yes, you'll get some interaction - that's true.  But it can be minimized.
Minimized to the point of not much interaction that is noticeable.

73,

Jon
NA9D

on 3/7/03 12:19 AM, i8cvs at domenico.i8cvs@tin.it wrote:

> Mounting a crossed yagi for CP in X or + configuration over a metallic
> boom produces the same effect over the circularity.
> 
> When two crossed dipoles are feed by the same amount of power but their
> components are 90 degrees out of phase the resultant vectors of voltage
> and current rotates by  2 x 360 x f  every second producing CP
> 
> The rotor of a AC sincronous motor rotates by the same phisical principle
> of magnetic rotating field discovered by Galileo Ferraris.
> 
> Try now to put your finger in to the squarrel cage of the motor in both
> X or + position and see what happen to it !
> 
> Your FINGER or your METALLIC boom are the same thing.

-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)

Citizen of the People's Democratic Republik of Illinois

Life Member: ARRL, NRA
Member:  AMSAT, DXCC

http://www.qsl.net/na9d   <- Updated on 1/22/03!!!

"A life lived in fear is a life half lived."


----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org