On Sun, 26 Jun 2005 13:37:46 +0000 (UTC), "Reg Edwards"
wrote:

A choke balun is what is inserted between the transmitter end of the
antenna feedline and the transmitte tuner. Or it can be inserted at
the antenna end of the line.

Questions : How effective is it? To what extent can the percentage
unbalance current on the feedline be expected to be reduced? Has
anybody ever measured it before and after insertion?
----
Reg.


I ran across an article on choke baluns recently in the 2004 ARRL
handbook. It said ( as best as I can recall ) that "purists" might
argue for the use of a choke balun for dipoles for the optimum
radiation pattern, but that most dipoles weren't high enough off the
ground to have a "correct" pattern anyway, so their use for optimum
radiation patterns is questionable at best. Keeping RF out of the
shack might be a different story ? I used a coaxial choke balun on my
G5RV but I don't use either a coaxial choke balun or a commercial
balun on either my 40 meter dipole ( too heavy, the dipole is
constructed out of 18 Ga wire ) or my 30 meter dipole. I was too lazy
to go through all the hassles of either wiring up a PL connector for
the commercial choke balun I have and I didn't want to wind up several
feet of coax for a coaxial balun ( weight and sag issues again )

YMMV

Gary