[Moon] Chapperal Septum Feed

[Koellner, Guenter (NSN - DE/Muenich)]

Hello,
 
since my dish having a f/D=0.32 is a very deep one, I now made a chapperal ring. Based on W1GHZ's advice, it is three times 0.17WL distance and 0.3WL deep.
The back plate is massive from 1mm alu with a formed 1cm wide flange for the feed's tube.
The rings are made from 1mm thick stitched material, which was easier to bend and also already provided one side of the drills.
The rings are bent 90°. I used simple standard rivet every 3rd hole. It needed to evenings of hammering.
 
I cannot tell a WHOW!, testing with the driver only showed that the echos strength became better but definitly more continuous.
 
You can see pictures on my web page:
http://www.qsl.net/dl4mea/antennas/feed/chapp23a.jpg and
http://www.qsl.net/dl4mea/antennas/feed/chapp23b.jpg
 
73, Günter, DL4MEA
 
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