http://airwaterkinginc.purification.com/bzmmremotemotor.html
Nice !
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of Rob Atkinson, K5UJ
Sent: Thursday, April 15, 2004 9:38 AM
To: tentec@contesting.com
Cc: k5uj@hotmail.com
Subject: [TenTec] 450 Ohm feedline
The purpose of twisting the line is not to reduce noise pickup and
radiation, it is to help keep the line balanced.
I'd forget about using any kind of wood pane. Go with plexiglass. Just
about any glass place will cut a plexiglass pane for you if you give them
the measurements. Go to Radio Shack and get a pair of banana plug
sockets/lugs and a pair of banana plugs. Drill two holes thru the
plexiglass the width of the banana plug socket lug shafts and spaced the
width of the feedline. Install them on the glass, bash out the old pane*
(the fun part) and put in the plexiglass one, solder the ladder line on the
inside to the lugs, solder the ouside end to the plugs. Now you have a feed
through and quick disconnect. Mine handles 1200 watts no problem. Get a
second pane made at the same time so if you ever move, you will be able to
put a normal pane in the window.
Across the ground outside I have had good experience supporting the feed
with pvc pipes stuck in the ground. And finally, as I've said before, I'd
use a balanced feedline tuner such as the one from Palstar, just inside your
window, and run coax from that to your shack. this works unless you qsy a
lot, for that I'd consider a remote controlled tuner from John Bliss (Air
and Water King--try a google search). This is if you want to run legal
limit. For the Argo, you can probably just run the ladder line to an
unbalanced tuner like the 238B at your operating position and that will work
fine.
Rob Atkinson
K5UJ
*The way to safely bash out a pane is to tape an X across the pane with
masking tape or duct tape, and smack the middle of the X with the handle end
of a screwdriver on the X and hammering it with a hammer on the other end.
Rubber mallet probably okay in lieu of the screwdriver/hammer.
The pane collapses outward but is held by the tape and the amount of glass
falling is minimized. Of course if you aren't in a hurry (I always am) and
don't want to have fun you can go around it chipping out the plaster : )
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