[Moon-Net] 23cm small dish feed idea

John Worsnop johnworsnop at gmail.com
Tue Nov 29 09:17:18 CET 2016


O.35  f/d

On 29 Nov 2016 08:16, "g4bao" <john at g4bao.com> wrote:

> This feed is proven to work extremely well. It leaves the other feeds
> standing in its wake for a small dish! I built it and it worked first time.
> I use it in my 1.9m f/d dish and have worked more than 80 initials
> including around 30 on CW using 150 Watts.
>
> Build it..... it works!
> 73 John
>
> On 29 Nov 2016 05:53, "Ingolf, SM6FHZ" <ingolf.fhz at gmail.com> wrote:
>
> 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:
>
> http://2ingandlin.se/Circularly%20polarized%20patch%20feed%
> 20for%201296%20MHz_A.pdf
>
> 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
>>
>>
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>>
>>
>>
>
>
> --
> Ingolf, SM6FHZ
> http://www.2ingandlin.se/SM6FHZ.htm
>
>
>
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