[117822] in Cypherpunks
herf image (fwd)
daemon@ATHENA.MIT.EDU (Jim Choate)
Sat Sep 11 17:02:52 1999
From: Jim Choate <ravage@einstein.ssz.com>
Message-Id: <199909112046.PAA10215@einstein.ssz.com>
To: cypherpunks@einstein.ssz.com
Date: Sat, 11 Sep 1999 15:46:42 -0500 (CDT)
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Reply-To: Jim Choate <ravage@einstein.ssz.com>
----- Forwarded message from Anonymous -----
Date: Sat, 11 Sep 1999 21:05:53 +0200 (CEST)
From: Anonymous <nobody@replay.com>
Subject: CDR: herf image
At 04:39 PM 9/10/99 -0500, Jim Choate wrote:
>There is a picture of the device at that link. The article says the
The picture shows a curved reflective sheet *behind*
an enclosed horizontal spark gap a few inches long. The
sheet is curved (parabolic?) around a vertical axis.
There is a square horn section *in front of* the gap. In the picture, the
horn has been moved to the side; there seem to be two semicircular
alignment marks used for lining up the horn section.
from above:
/
/ /|
< spark | |
\ \| horn
\
curved sheet
----- End of forwarded message from Anonymous -----
That's interesting, I get a slightly different impression from the image.
It looks to me like a spark gap at the foci of a parabolic horizontal
reflector/focuser. Above and below the plane of the focuser were two
horizontal wave-guides. The rear, or small side, would be co-axial with the
spark gap. This would have the effect of focusing the majority of the spark
gaps output into a roughly horizontal beam.
I especialy like the 20 ft. range that was reported in The Register.
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