[Elecraft] KAT500 update

[Ron D'Eau Claire]

That's the point, as Don pointed out: "sufficient impedance". A normal rule
of thumb is to have choking impedance 10X the line impedance. That's easy if
you have a 50 Ohm line, such as the input to the tuner. It's quite a
different story if the line impedance is 1000 or 2000 ohms, such as can
happen on the output of the tuner feeding an "all band doublet" or similar
antenna with open wire line.  

Ron AC7AC

-----Original Message-----
On a previous post I included three links which if read would lead you to
the conclusion that a common choke on the output of the "unbalanced" tuner
of sufficient impedence would ensure that all of the current on the
interior of the shield of the coax and on the center conductor would be
present on the "balanced" line if the outside of the shield was prevented
from carrying RF.

That equal and opposite current present on the "balanced" line is what is
desired.

No transformer, balun, etc which would be suject to widely varying
impedences from such a line is required.

Just squirt the current in equal and opposite amounts and don't let it leak
anywhere.... <-technical description...

jim ab3cv