[Elecraft] Elecraft Digest, Vol 213, Issue 6

[Fred Jensen]

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-request at mailman.qth.net wrote:
>> Message: 17
>> Date: Fri, 14 Jan 2022 11:26:13 -0700
>> From:ho13dave at gmail.com
>> To:elecraft at mailman.qth.net
>> Subject: Re: [Elecraft] [OT] Loss in window line [OPINION] [LONG]
>> Message-ID:<CA9FBF80-BA6D-4E4B-9AF8-15C2D5791B55 at 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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