I didn't measure significant increase in loss with clean water i.e. tap
water sprayed on the entire length of the line from a hose. I did make
a solution of dish washing detergent and water and , using a spray
bottle, sprayed that on the line. This caused much more water to cling
to the line. While the loss did not appreciably increase, I did notice
the electrical length of the line changed a measurable amount.
Measurements were made such that the line was operating at its
characteristic impedance. The source was the tracking generator in my
Spectrum Analyzer, sweeping 1 MHz to 50 MHz.
73
Bob, K4TAX
On 1/18/2019 11:56 PM, Walter Underwood wrote:
On Jan 18, 2019, at 6:08 PM, Al Lorona <alor...@sbcglobal.net> wrote:
Thing 1 is that, clearly, water really messes up window line's loss. However,
I'm guessing that a/ in a place like southern California, where perpetual
drought is the new normal; ...
Clean water isn’t a problem. Dirty water is a big problem.
When I first moved to the SF Bay area in the early 1980s, I was surprised by
the number of power outages, compared to where I grew up in Louisiana with
heavy weather. The first light rain would be accompanied by outages. With six
or more rainless summer months, dust and grit would accumulate on the power
line insulators. The first light rain would create conductive mud and trip
breakers. So perpetual drought is just a way to build up more dust on the line.
I think we take coaxial cable for granted. It was a brilliant invention and a
real gift to people who love radio. Maybe I’ll start celebrating December 8th
as Coaxial Cable Day.
https://www.wired.com/2009/12/1208coaxial-cable-patent/
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
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