On Mon, 2 Mar 2009 10:16:27 -0800, Randy Cook wrote: >HOW MANY OF YOU ARE USING PAR ELECTRONICS END FEDS
This is a VERY easy antenna to build. Why would anyone want to buy what they can build in an hour for a fraction of the cost? See http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf One half of the dipole is a quarter-wavelength of wire, connected to the center conductor of the coax feedline. One quarter-wave from the end where the wire is connected you add a ferrite choke that functions as an "end insulator" for the coax, which makes the section of the coax between the wire and the choke the other half of the dipole. You do NOT apply a velocity factor when determining the length of the coax between the wire and the choke. If you're running 100W or less, the choke can be as simple as 10 turns of the coax around two 2.4-inch o.d. toroids, #31 or #43! I used much bigger chokes to run 1.5kW. For 20W or less, a single toroid is plenty. 73, Jim Brown K9YC ______________________________________________________________ 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
