My experience as well. No real change in loss but the complex impedance
at the TX end does change enough to require a re-tune. It used to be so
much simpler when the tank circuit on the PA served as both a matching
network and harmonic filter. 😉
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Bob McGraw wrote on 1/14/2022 12:25 PM:
Based on my measurements and method I used to measure 100 ft of window
line, the loss in the line from dry to wet is frankly nil. However,
the wet line does show a velocity factory change, in effect an
electrical change in line length, and thus when connected to an
antenna, will have a small effect on the impedance at the station end
of the line.
I really think and believe many comments and opinions regarding window
line, are more "old ham lore" not based on true and complete facts.
73
Bob, K4TAX
On 1/14/2022 12:26 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 17
Date: Fri, 14 Jan 2022 11:26:13 -0700
From:ho13d...@gmail.com
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] [OT] Loss in window line [OPINION] [LONG]
Message-ID:<ca9fbf80-ba6d-4e4b-9af8-15c2d5791...@gmail.com>
Content-Type: text/plain; charset=us-ascii
I concur with the conclusion that water has little effect on window
line. I base this on my own experience using window line for years. I
always feed it into a tuner and, if water has any effect on the line,
I have to adjust the settings of the tuner. It is only necessary to
adjust the tuner under very heavy rain. Anything resembling a normal
amount of water on the line has essentially no effect, even after
years of dirt buildup.
Years ago, when I had a swimming pool, I spanned the pool with a
length of underwater ladder line and made some simple measurements
that indicated only a nominal change. And pool water is purposely
chlorinated, which increases the conductivity, although I don't know
by how much.
73 de dave
ab9ca
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