There was an article in QST a few years back in which a guy actually measured losses in various kinds of zip cord. Losses were very high -- his conclusion was "don't use this stuff for feedline except in emergencies."
On 5/16/2011 8:38 AM, Ron D'Eau Claire wrote: > The feed line losses go up as the impedance goes down. "Zip" cord (like > speaker wire) has two close spaced conductors, so the impedance is quite low > as "balanced" feed lines go. I've seen actual impedance measurements in the > 50 to 100 ohm range published. > > So it might be a little better than coax at high SWR's but not > significantly. > > Ron AC7AC > > -----Original Message----- > > David, > > I take your point. Not sure about the use of twin loudspeaker wire for > portable applications. It might be satisfactory when split to make the > antenna element, but could be lossy when used as a feeder, don't know. > > 73, > Geoff > GM4ESD > > On May 16, 2011 at 12:48 PM, CUTTER DAVID > >> I can understand this in a home situation, but for use with a very >> lightweight, low bulk portable rig like a KX1 I would use something like >> 16/0.2, (16 strands of 0.2mm copper, similar to 14/0076). I> >> wouldn't for instance hang flexweave from a floppy fibreglass pole, but >> I've done it with this thin multi-strand insulated wire. Flat twin >> loudspeaker wire as shown in (all?) post-war ARRL handbooks> >> doesn't even need a centre insulator/connector. My criteria is: if it >> falls out of the tree/balcony/hotel room window, will it cause damage or >> hurt someone? > > 73 > David > G3UNA -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______________________________________________________________ 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
