[Elecraft] open wire feeders

[Jim Miller]

The coax will be exposed to whatever SWR is on the feedline. The SWR will
vary as a function of line length, characteristics, antenna length/height
and frequency of operation. If you know the SWR you will be seeing then you
can use coax loss calculators available online to see what the impact of
the various coax types and lengths.

The use of a balun is generally counterproductive for this purpose. A
common mode choke is what you want. Google W9CF for math to show
theoretical details and K9YC for practical implementations.

A practical CM choke is inexpensive and easy to build.

73

jim ab3cv