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1) I have a load of Rexolite 1422 that I need to use up
2) Inherently waterproof and spider-resistant.
3) Small enough to fit alongside a similar model on 5.7 GHz with
2 degrees of dish nod to swap bands
It isn't going to be any better than a well-designed W2IMU or
Pickett-Potter or corrugated-choke horn in terms of sidelobe
suppression, but it is reasonably easy to control sidelobes and
set a decent edge taper.
I'll make half a dozen and see how they look on a rotary mount,
and then see what sort of sun noise I get when compared with a
On 09/03/2021 20:53, Colin Ranson
Looks nice Neil – yo a star ! as my brummy
missus would say. I don’t think I can get away with anything
bigger than a Zone 2 elliptical – my house is stating to look
like the Mothership in Battlestar Galactica !
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I'm making some lensed dielspike horns with a collar to fit a
40mm feedhorn clamp on an offset dish, they have an aluminium
body with an SMA connector and a truncated conical Rexolite
1422 lens similar to the ones designed by HB9PZK for QO-100.
The cone angle is calculated to give a 12dB edge taper on a
typical 80cm offset dish
They are sealed units and designed to be left out in the
rain. I haven't tried doing them with an N connector mainly on
cost grounds, but it should be feasible to use an N connector
with a reduced SMA base in exactly the same unit, so long as
it has a 4.06 mm PTFE sleeve. You could probably modify any
SMA-equipped transition to use one of these N types (perhaps
from someone cheaper than H&S!)