[Elecraft] Baluns & wires & feeders (oh, my!)

[N2TK, Tony]

I ask this as a question - Putting baluns or UN-UN back to back checks that
both have the same ratio and can check efficiency if they are transformers
such as what is used on beverages. How does this check if it is working well
as a balun? As an example, a straight piece of coax with ferrite beads on it
could be treated as one or two baluns back to back. But just checking power
at the end versus power going in would seem to check the efficiency of the
coax but not tell you how much, if any RF was on the outside of the shield.
Please correct me if I am all wet.

73,
N2TK, Tony

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Dave G4AON
Sent: Saturday, October 07, 2006 2:54 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Baluns & wires & feeders (oh, my!)

There is a simple way to measure the efficiency of a balun, make two of
them and connect them "back to back". Measure the power fed to them and
the corresponding output power. Obviously this doesn't take a mismatched
antenna into account.

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