Guys, this is why I specifically stated to use a high quality 300 Ohm
feedline.
The Wireman sells stuff which uses stranded copperweld. (Radio Works too).
It is a lot stronger than standard 300 Ohm TV twinlead.
73
Rick
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of Dr. Gerald N. Johnson
Sent: Sunday, January 09, 2011 1:40 PM
To: tentec@contesting.com
Subject: Re: [TenTec] Suggestions please
I had more trouble with wind with TV twinlead over the past 39 years in
central Iowa. Ice was harder on the 18 gauge copperweld open line. The
wire simply snapped when a breeze flexed the feed line while encased in
ice. Twisting the twinlead may have been a benefit to break up the
airfoil lifts that made it flop in the wind.
73, Jerry, K0CQ
On 1/9/2011 12:34 PM, Rsoifer@aol.com wrote:
Jerry,
Iowa may be a worse environment for ice than New Jersey where I was at the
time, but I had no problems with mechanical strength. Of course, my
feedline run was only 50 feet, pretty much straight up.
73 Ray W2RS
In a message dated 1/9/2011 5:48:47 P.M. GMT Standard Time,
geraldj@weather.net writes:
But the TV grade line needs help in the support department. 22 gauge
copper wires aren't strong enough to take the wind and ice load on the
flat of the insulation. I figure on punching holes every 6 or 8 inches
and feeding an insulating rope through them, probably take a turn around
one or both sides between passes through the holes to give more support
and to break up the airfoil. I might use parachute cord for that support
rope. Then tie the upper end to the center insulator and the lower end
to some sort of anchor before going to the feedthrough to get into the
shack.
73, Jerry, K0CQ
On 1/9/2011 11:36 AM, Rsoifer@aol.com wrote:
Tom,
In a pinch, I have used Radio Shack's "heavy duty" 300-ohm twin-lead
with
power levels up to 500 watts. No problems.
73 Ray W2RS
In a message dated 1/9/2011 5:07:40 P.M. GMT Standard Time,
xring97015@gmail.com writes:
I have been off the air for a while and am now trying to get back up to
speed(cw only here). I need to rebuild my antenna and am curious what
you
folks recommend for a ladder fed doublet- buy or build. Also I want to
reassess my tuner/balun set up. I know this is a gigantic can of worms
and
has been hashed since the beginning.
I use an OMNI VI and only run 100 watts. I do not have plans to install
a
power amplifier at this location. I am looking for efficiency and need
to
avoid causing interference as my home is close to the neighbors.
Thanks in advance for any suggestions.
Tom Stewart N7ESE
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Version: 10.0.1191 / Virus Database: 1435/3374 - Release Date: 01/11/11