On Tue, 10 Feb 2004 09:08:15 +0000 (UTC), Luddite
wrote:

Richard Clark wrote:
On Mon, 9 Feb 2004 23:56:36 +0000 (UTC), Luddite
wrote:


here is a new picture

http://pages.ripco.net/~a2k/parabolic-feed.jpg

There is only the one element fed by a 3 foot pigtail of 9913.
the plan was to change it to rg-174 or .141 hardline and attach
a USB wifi device to the rear,and add the correct sized feed.
or I might settle for less than its rated 21db gain.

Hi OM,

It is a dual element feed. You have what appear to be two quarterwave
slots, one wavelength apart (probably for better position

could you please explain the dual element part?
I thought they were used for attachment,look closer and you
should see remnants of melted black plastic I sliced off over them.

Yes, it did look a bit tacky. It is difficult to judge the design
from a photograph without knowing the composition of the various
components or the scale (you should show a ruler nearby).

Without being able to judge the relative positions and size of these
"plastic" elements, it is difficult to say they are mounting ears or
if they are part of a dielectric lens. Why did you "slice" them at
all?

Another clue that is missing is: What is the orientation of the feed
to the reflector? Here a picture is more meaningful than the one of
the isolated feed.

tolerancing). What you offer above actually explains nothing. Change
out 9913 to what end? Even RG-58 over that length would serve.

in this case its too big for the connectors being used.

Spend $3.98 for an adapter.

Attach a USB WiFi for what? To transceive?
Why don't you just try it and see what happens? Nothing gonna break
and if it works that's the end of it. If it doesn't work, you have
more problems than a 4% frequency shift.

This advice still stands.

73's
Richard Clark, KB7QHC