Re: [Elecraft] Elecraft Digest, Vol 213, Issue 6
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: 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 -- This email has been checked for viruses by AVG. https://www.avg.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Elecraft Digest, Vol 213, Issue 6
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: 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 -- This email has been checked for viruses by AVG. https://www.avg.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Elecraft Digest, Vol 213, Issue 6
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: 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 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
