[Antennas] zip line

Mon, 08 Apr 2002 21:17:47 -0700

Hi Bob,

Interesting that you mention the ARC-5. When I was first licensed as ZS1ZG
in November 1962, I also tried operating a "stock" ARC-5 transmitter on 40m
CW with a random-wire antenna, but could never conquer the key-clicks and
chirp of the M.O.P.A. design. (Another friend alleviated that problem by
regulating the 1626 M.O. and the P.A. screen supply using an 0D3 tube). Not
wishing to be the star of the evening show on the Post Office Radio
Inspector's spectrum analyser, I did not pursue the M.O.P.A. track any
further. I built a pretty decent 20m transmitter out of a gutted ARC-5,
driven by an external VFO with a doubler stage. My 20m antenna was a
ground-plane.

Best 73,
Adam, VA7OJ/AB4OJ
North Vancouver, BC, Canada
http://www.qsl.net/ab4oj/
Note new e-mail address:
mailto:[email protected]

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Bob Wilder
Sent: Monday, April 08, 2002 20:59
To: Antennas Reflector
Subject: RE: [Antennas] zip line

Years ago when using zip cord for feedline it was covered with rubber...I
have used it
on 160 and 80 CW with good luck running about 75 watts to an ARC-5
transmitter...
but that was probably 50 years ago....With an transmatch it even worked
better.
Like Adam said, now days PVC is the insulation of choice for the producers
of
zip cord.

At 08:44 PM 04/08/2002 -0700, Adam Farson wrote:
>Before we get too carried away...
>
>Zip cord (cheap lamp cord) is made with PVC insulation, which has lousy
>dielectric properties.