> One can use RG-8 coax with shield and outside covering removed (just using > the center wire and internal insulation to connect a tuner to vertical > antenna.
... but once you remove the shield, you no longer have a coaxial cable, you have an insulated piece of wire. A wire is appropriate for the short run involved in tuning an inductor. Come to think about it, at 600 meters, most any jumper could be considered electrically short. hi hi Mark AD5SS On Mon, Jul 29, 2013 at 4:01 PM, Edward R Cole <[email protected]> wrote: > Kind of OT, but: > > One can use RG-8 coax with shield and outside covering removed (just using > the center wire and internal insulation to connect a tuner to vertical > antenna. > > I use such as my HV jumper from the base coil of my 500-KHz inverted-L to > the "top" of the coil (10-inch diameter 11-inch long wound with solid 12ga. > copper wire): > http://www.kl7uw.com/Coil005_1.jpg > > I don't use a tuner at the base coil, at present. I tap the "bottom" of the > coil 2-1/2 turns up and connect that to my RG-213 cable. The bottom of the > coil is tied to a ground post and four very wide but short radials (1/4 WL = > 930-feet so both antenna and radials are "short - very short"). The > vertical section consists of three parallel wires 43-foot high, spaced a > foot apart, and the top hat is two parallel wires 122 foot long spaced > 2-feet. Z = 0.81 - j681.5. Efficiency is 0.8 %. 100w RF output results in > ERP = 4.15w. > > Some day I will attempt use of the antenna on 80 & 160m. > > Oh the radials are novel: 50 to 70-foot long 2-foot wide chicken wire > fencing laid on top of the lawn. > for more info on what we are doing on the 630m band: > http://www.kl7uw.com/600m.htm > > 73, Ed - KL7UW > http://www.kl7uw.com > [email protected] > "Kits made by KL7UW" ______________________________________________________________ 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
