Hi Tony,
Reasonable coaxial cable loss isn't an issue on the low bands unless you're using an inefficient receiving antenna (e.g. small loop, BOG, or high impedance short verticals). Most inefficient receiving antennas use a remotely powered preamp at -- or very near -- the feed point so even in those cases feed line loss isn't an issue on the low bands 73 Frank W3LPL ----- Original Message ----- From: "N2TK via Elecraft" <[email protected]> To: "Frederick Dwight" <[email protected]>, [email protected] Sent: Friday, April 3, 2020 5:31:45 PM Subject: Re: [Elecraft] 75 ohm coax I have been using Commscope F660BEF for years for both receive lines and transmit coax for my 80M 4-sq using F-connectors. The other year I had a 100' piece of RG6 that had a solid copper center conductor and a copper braid. Compared that to the F660BEF on 1.8 and 3.5 for loss at 100'. I did not see any difference in power loss. I guess the F660BEF has enough copper plate to keep losses low on the low bands. Or maybe I just had a bad piece of copper RG6? N2TK, Tony -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Frederick Dwight Sent: Friday, April 3, 2020 2:09 AM To: [email protected] Subject: [Elecraft] 75 ohm coax If your 75 ohm coax has a steel/copper coated center conductor, be sure to test it for loss on the lowest frequency band you will use. I experimented with a steel core 160 meter antenna and found it had some additional loss and probably due to the inductance it could be shorter for resonance (10 % perhaps ??) so I abandoned the idea. Never noticed the effect on higher frequencies. Sent from Mail for Windows 10 ______________________________________________________________ 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 Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
