[Elecraft] K3 KAT3 Antenna Tuner Tutorial

[The Smiths]

I know someone that drives a bus for a living..
 
WHAT DOES ANY OF THIS HAVE TO DO WITH THE GUYS QUESTION. He had a VERY simple question. Just answer it if you know, if not, save your science lessons for those that actually want to talk about that off the reflector!  Some times you CAN be too smart for your own good. Guys, You don't always have to answer EVERYTHING just because you think you can.


 
> Date: Thu, 22 Oct 2009 15:05:37 +0100
> From: d.cutter at ntlworld.com
> To: km5q at mac.com; gm4esd at btinternet.com; daleputnam at hotmail.com
> CC: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 KAT3 Antenna Tuner Tutorial
> 
> I've heard that some folks rub silicone furniture polish on the ladder line to keep moisture from settling, then dust, mud, etc doesn't stick.
> 
> David
> G3UNA
> 
> ---- Geoffrey Mackenzie-Kennedy <gm4esd at btinternet.com> wrote: 
> > Dale, I suspect that in Windy's case moisture could be entering via tiny 
> > holes drilled in the dielectric by windblown sand or dust. Unfortunately I 
> > cannot offer any practical solution to prevent this happening, because I do 
> > not use window line.
> > 
> > 4 wire open wire feeder behaves like a lovesick octopus unless kept under 
> > tension. A very useful type of low cost feeder for long low loss horizontal 
> > runs at HF and VHF though.
> > 
> > 73,
> > Geoff
> > GM4ESD
> > 
> > 
> > Dale Putnam wrote on Thursday, October 22, 2009 1:01 PM
> > 
> > Geoff has touched on what may be happening. I've seen this on my systems 
> > here too... and the issue comes down to the material, in this case mud or 
> > water and dust... collecting on the feeder, then as the moisture drys away, 
> > the change in transmission line characteristics also change. There are a 
> > whole page of math equations and figures that prove this, but suffice it to 
> > say for now, that open wire, doesn't have this issue... it has others... 
> > more physical, like how to keep it spaced and installed correctly.
> > Retuning isn't a real problem, it is pretty much just adjusting for what 
> > the moisture is changing. However... be watchful for the moisture changes to 
> > not go away completely.... then go look for where the moisture isn't leaving 
> > and find an opening in the insulation, and repair it, before the feedline 
> > becomes damaged too much by the moisture invasion.
> > Still beats coax for losses.
> > 
> > --... ...-- Dale - WC7S in Wy
> > 
> > 
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