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 <[email protected]> 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 > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
