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

[N2TK, Tony]

Tnx Karl. Yes I must have missed the first part. Yes this will work for
measuring the loss.
73,
N2TK, Tony

-----Original Message-----
From: Karl Larsen [mailto:k5di at zianet.com]
Sent: Saturday, October 07, 2006 9:54 AM
To: N2TK, Tony
Cc: 'Dave G4AON'; elecraft at mailman.qth.net
Subject: Re: [Elecraft] Baluns & wires & feeders (oh, my!)

N2TK, Tony wrote:
> 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.
>
    Hi Tony, you missed the question. We assumed the balun's were made
properly. The task was to measure the loss through them.

73 Karl

> 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.
>