Good replies. Thanks.

So: does the commonly available choke balun (round cylinder with coax
connectors on each end, and ferrite beads inside the cylinder) allow us to
put unbalanced feed in one end, and get balanced feed on the other?

Or, are they ununs?

A properly operating choke (current) balun will cause the currents in
the two conductors to be balanced (equal and opposite) at both ports. So
I guess you could call it a balbal if you want.

Why would anyone want a device that causes the currents at both ports to
be unbalanced?

Roy Lewallen, W7EL

RB wrote:
Good replies. Thanks.

So: does the commonly available choke balun (round cylinder with coax
connectors on each end, and ferrite beads inside the cylinder) allow us to
put unbalanced feed in one end, and get balanced feed on the other?

Or, are they ununs?

OK. I read that most excellent article.

I think Figure 21-4 (A) definitively answers my question about the ferrite
bead choke balun. Yes, I can put unbalanced feed in one end, and get
balanced output on the other.

Thanks again for all the good info.

On Sun, 27 Nov 2005 01:29:29 -0600, "RB"
wrote:

Good replies. Thanks.

So: does the commonly available choke balun (round cylinder with coax
connectors on each end, and ferrite beads inside the cylinder) allow us to
put unbalanced feed in one end, and get balanced feed on the other?

Or, are they ununs?

I suggest you take a look at this:

http://www.w2du.com/r2ch21.pdf

73
Danny, K6MHE

email: k6mheatarrldotnet
http://www.k6mhe.com/

RB wrote:
So: does the commonly available choke balun (round cylinder with coax
connectors on each end, and ferrite beads inside the cylinder) allow us to
put unbalanced feed in one end, and get balanced feed on the other?
Or, are they ununs?

Since they function by choking RF on the outside braid, they
can function as either baluns or ununs. If RF is choked and
not flowing on the outside braid, then differential currents
are forced to flow in the two remaining conductors be they
parallel wires or the inside wire and braid of the coax.
--
73, Cecil http://www.qsl.net/w5dxp

A choke balun allows you to go from unbalanced to balanced. If you check
Walter Maxwells site and review Chapter 21 (IIRC) of reflections. He gives a
test setup that will aid in understanding.

"RB" wrote in message
. ..
Good replies. Thanks.

So: does the commonly available choke balun (round cylinder with coax
connectors on each end, and ferrite beads inside the cylinder) allow us to
put unbalanced feed in one end, and get balanced feed on the other?

Or, are they ununs?