"-.-. --.-" wrote in message ...
Greets OMs,

yesterday i had a QSO with K2US - impressive antenna, by the way i'm using
the station of a local OM near my QTH with a 4 elements 5 band Quad.

The beautiful thing is the 9-9+20 signal around 20.45 UTC, far away in
magnitude from the others stateside signals, around S5-7. So i remember my
father that tell me one day in his opinion the circular polarization in
the better choice... lose no matter about 6 dB, with any kind of
polarization used at the other side except circular - and faraday torsion
due to ionosphere - and in my mind comes 2 questions...

- we take some advantage from the fact that both are using quad antenna ??
- in my non-knowledge of the facts, i have in the past believed that the
quad antenna is near a circular-polarized antenna. Reading books and
hearing some QSO in the air i learn that quad can be horizontal or
vertical polarized, regard the feed point of the quad.. so - the circular
polarization need some kind of "special" feed point or is merely a
"circle" antenna ??

Apologize for the english and for the questions, maybe trivials and
stupids, but i believe one esxperienced OM can say far better than 100
books.

73,
CQ -.-. --.-


a quad is generally linearly polarized, either vertical or horizontal. to
get circular polarization you need dual driven elements with the proper
phasing.

"Dave" ha scritto nel messaggio
...

a quad is generally linearly polarized, either vertical or horizontal. to
get circular polarization you need dual driven elements with the proper
phasing.

Like a calculated piece of coax used to drive the 2nd element 90 electrical
degrees after the first ??

-.-. --.-

"-.-. --.-" wrote in message ...

"Dave" ha scritto nel messaggio
...

a quad is generally linearly polarized, either vertical or horizontal.
to get circular polarization you need dual driven elements with the
proper phasing.

Like a calculated piece of coax used to drive the 2nd element 90
electrical degrees after the first ??

-.-. --.-

Hi MG

It isnt at all so simple as feeding one radiator 90 degrees later than
another to get "circular" polarization. For instance two linear radiators
can be fed in phase to get "CP". And two linear radiators can be fed with
one 90 defrees earlier (or later) than the other.
Look at wikipedia http://en.wikipedia.org/wiki/Circular_polarization

I'd expect that you can feed two Quads in phase to get CP along the axis
of their mounting boom. You'd space them appropriately and conect their
fed points appropriately.

Jerry KD6JDJ

"Jerry" wrote in message
...

"-.-. --.-" wrote in message ...

"Dave" ha scritto nel messaggio
...

a quad is generally linearly polarized, either vertical or horizontal.
to get circular polarization you need dual driven elements with the
proper phasing.

Like a calculated piece of coax used to drive the 2nd element 90
electrical degrees after the first ??

-.-. --.-

Hi MG

It isnt at all so simple as feeding one radiator 90 degrees later than
another to get "circular" polarization. For instance two linear
radiators can be fed in phase to get "CP". And two linear radiators can
be fed with one 90 defrees earlier (or later) than the other.
Look at wikipedia http://en.wikipedia.org/wiki/Circular_polarization

I'd expect that you can feed two Quads in phase to get CP along the axis
of their mounting boom. You'd space them appropriately and conect their
fed points appropriately.

Jerry KD6JDJ


Jerry has both bad eyes and bad code. I now see CQ and not MG. Sorry!

Jerry KD6JDJ