[Elecraft] PAR endz-fed

[Jim Brown]

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