That's true but sometime we use current baluns in 50 ohm systems and one
should be aware of what happens to the Z when the line in the balun is some
random impedance.
I've done some tests on various types of baluns looking at balanced to
unbalanced conversion verses frequency and losses and I like 3 to 4"
diameter toroids with a mu of 100 to 200 wound with Teflon coax. Most of my
antennas are close to 50 ohm and I don't need any unwanted impedance
transformations.


--
John Passaneau W3JXP
State College Pa

This mail is a natural product. The slight variations in spelling and
grammar enhance its individual character and beauty and in no way are to
be considered flaws or defects.


"Reg Edwards" wrote in message
...
When connecting a 50-ohm circuit to a 600-ohm line via a choke balun it
makes no difference what the impedance of the short length of line
forming
the choke might be.

For practical purposes the severe mismatch is due entirely to the
difference
between 50 and 600 ohms.

One must avoid suffering from delusions of accuracy.
---
Reg