[Elecraft] balanced tuner

[David Woolley]

Tom W8JI wrote:

> 
> It takes exactly the same common mode impedance and common mode current 
> and voltage capacity in the balun if it is located at the tuner output 
> or at the tuner input when the network is a floating unbalanced  

Probably true of the 1:1 configuration, but not of the 1:4 
configuration.  If you analyze the latter in terms of chokes, you have a 
  choke connected across the differential signal, so if the differential 
impedance is high, most of the current would bypass the antenna.

Having a high impedance (short) antenna, is precisely when you might 
think in terms of using the 1:4 configuration.

As an extreme case, consider what happens if you feed such a balun from 
a high current DC source.


> network. The core (if used) will get just as hot, and current unbalance 
> (except for stray capacitance or network transmission line effects) will 
> be exactly the same.
>

-- 
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.