Richard Clark wrote:
On Sat, 18 Dec 2004 09:52:07 +0100, Darko
wrote:

Any URL with examples, plans, calcilations ?
Any book ?

All I find are rectangular WG slot.
Only "Alford Slot" but that isnt what we talk about.


Hi OM,

It isn't? Why? This one is available at:
http://www.eta.chalmers.se/~pgp/alfo...lford_eng.html
and seems a perfectly useful introduction to the topic.

Hi Richard !

Yes, this is Alford, kind of slot antenna.
But we searching for "round pipe slot WG antenna" not using usual Wave
Guides.
Just for info, not for build, rectangular, standard WG slot antenna is
much easy to make.

73 !

On Sun, 19 Dec 2004 01:03:10 +0100, Darko
wrote:
But we searching for "round pipe slot WG antenna" not using usual Wave
Guides.

Hi OM,

This is a contradiction.

The Alford type is not the usual waveguide. Round waveguides are more
frequently used for rotating connections (RADAR), and only for short
sections. The Alford type is a classic "Slot Antenna" and, in fact,
is not a waveguide at all.

I did provide square waveguide slot antennas and you did not respond
to them.

If you reject both round and square examples, then there is not much
left to talk about.

73's
Richard Clark, KB7QHC