[Moon-Net] 23cm small dish feed idea

Ingolf, SM6FHZ ingolf.fhz at gmail.com
Tue Nov 29 06:53:22 CET 2016

Hi Alan.

If you are looking for a 23 cm circularly polarized feed for being used for
EME with a small (in wl) dish you might want to consider this one:


It is proven "in combat" and is used by several moonbouncers with dishes
your size with very satisfying results. Among them SM6PGP and G4BAO. It
goes well with dishes with f/D from ~0.32 to ~0.4.

I do hope you find a solution that satisfies your needs, Alan.

73 / Ingolf, SM6FHZ

2016-11-28 21:33 GMT+01:00 Alan Beard <beardal at unixservice.com.au>:

> Hi all,
> With my 2m prime focus dish, I'm not that keen on a septum waveguide feed,
> sticking out from the feed point, some 60cm and pre-amps and cables etc.
> etc..
> This "Penny Feed" idea brings the feed back into the dish centre, a dead
> area
> usually blocked by the feed anyway. Short cables can then go through my
> dish
> centre, reducing messy cables enormously. I can even replace the feed
> struts
> with fiberglass rods.
> My question is, can the waveguide here (below) be square (or round) as
> with
> a septum circular polarised feed?
> (slots on all sides)
> (Can someone model this please?)
> From: http://www.microwave-museum.org/exhibits/mwm0024.htm
> 73 Alan VK2ZIW
> Evil flourishes when good men do nothing.
> ---------------------------------------------------------------------------
> Alan Beard               Unix Support Technician from 1984 to today
> _______________________________________________
> Moon-Net posting and subscription instructions are at
> http://www.nlsa.com/nets/moon-net-help.html

Ingolf, SM6FHZ
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