Just a little info on your question...
A 1:1 current balun is equivalent to a transmission line running
through a choke core - by isolating one side from the other to
non-differential conditions, it prevents rf from getting back down the
feedline once it's "released" from the transmission line at the
connection to the antenna. This helps to force equal currents to flow
in the antenna legs, as they have nowhere else to go (so to speak). A
sleeve-type balun (a few cores strung on the coax at the feedpoint)
will work identically.
A 1:1 Voltage balun is a 1:1 transformer, with one side (feed)
referenced to ground (the shield) and the other side floating (the
antenna). Either works fine, but the current type has the advantage
of limiting rf on the outside of your coax in the case of reflected
power.
Voltage baluns show up when someone is trying to create a ratio other
than a whole-number-squared (1:1, 4:1, 9:1) like, for instance, 6:1
as these cannot be created with the "transmission line through a core"
model. Thus they resort to the transformer model instead.
Regards... Robert
Can anyone enlighten me regarding the difference between a 1:1
balun
marked as a "Current Type" and another 1:1 marked only as a balun?
I am
going to use either one to couple unbalanced coax to a flat top
dipole.
thanks
Don Johnson
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