RG9 (or its modern version, RG-214) has two woven shields of silver plated copper.
Jack K8ZOA On 4/13/2011 2:08 PM, Ken Roberson wrote: > Lew, > > Look up RG9 I think it 52 OHM coax that has two shields. > > 73 Ken K5DNL > > ---------------------------------------------------------------------- > > > --- On Wed, 4/13/11, Lew Phelps K6LMP<[email protected]> wrote: > >> From: Lew Phelps K6LMP<[email protected]> >> Subject: [Elecraft] OT trying to identify "mystery" coax cable >> To: "Elecraft Reflector"<[email protected]> >> Date: Wednesday, April 13, 2011, 11:58 AM >> I was browsing through the local >> Salvation Army Thrift Store (where I sometimes go looking >> for low-priced antique treasures), and stumbled across a >> 50-foot length of RG-8-type coax cable. At the asking price >> of $6.00, I couldn't pass it up. >> >> It has Amphenol male "UHF" connectors. And absolutely NO >> markings on the cable itself indicating manufacturer or >> type. The OD of the cable varies from point to point, but >> averages about .405 inch, which puts it in the RG-8b family. >> It is quite flexible, and clearly stranded center conductor, >> not solid. Capacitance of the 50 foot cable >> was measured 1155 pF, or 23.1 pF per foot, which eliminates >> some RG-8 flavors that have 30 pF per foot. The only >> distinguishing feature of the cable is that there appears to >> be a wire would spiral-wise (1/2 turn per inch) outside the >> standard foil shield and under the exterior rubber >> sheath. I've never need that construction before on >> any RG-8 cable. (I haven't cut it open to verify the >> construction, because I don't want to have to de-solder and >> reconnect the Amphenol connector.) >> >> I attached the cable to my dummy load and to the HF output >> of my K3. Keying the transmitter at 12 watts produces >> an SWR of 1.05:1 (external SWR meter) on all bands up to 6 >> meters, and continuity checks confirm that the cable has >> neither short circuit between shield and cable nor open >> circuit. In other words, it appears fit for duty. >> >> Two questions; >> 1. Anything else I can or should do to check the cable and >> make sure it's OK to use? (Unfortunately, I do not own >> or have access to an antenna analyzer.) >> 2. Based on the "spiral winding" between the shield >> and outer coverk does anyone have an idea what specific >> cable this might be? >> >> Thanks, and 73 >> >> Lew K6LMP >> >> >> ______________________________________________________________ >> 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 >> > ______________________________________________________________ > 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 > ______________________________________________________________ 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
