Re: R: [amsat-bb] Cross Boom (Long)

[Jon Ogden <na9d-2@xxxxxxxxxxxxx>]

on 3/8/03 4:03 AM, i8cvs at domenico.i8cvs@tin.it wrote:

> Look please at a circularly polarized microwave feed horn for EME
> type W2IMU or VE4MA
> 
> They are made using a lenght of circular waveguide wich is closed at
> one end and is open to the other end.
> 
> Two probes mounted at 90 degrees one to the other are fitted in the
> same plane near the close end of  waveguide.
> 
> Each probe is supplied with the same amount of power and with the
> same phase.

Dom,

A waveguide horn is a completely different beast.  In a waveguide horn, your
RF energy has already been launched from the radiating element.  On a yagi,
the RF energy has not been released.  The waveguide effectively takes the
launched RF wave and "concentrates" it in a particular direction.

You are looking at apples and oranges, my friend.

73,

Jon
NA9D

-------------------------------------
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."


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