[Elecraft] balanced tuner

[Don Wilhelm]

Arie,

An L network with the inductor in series with the line can be easily 
made into a balanced tuner - use half the inductance and put the result 
in series with each leg of the load.  I have often thought about 
creating a tuner like that by altering a KAT100 (using a second board 
and set of relays, but the same controller), but have never gotten 
around to it.  The disadvantage of the KAT100 for me is that it cannot 
be used remotely, and my need is for a tuner 150 feet of coax away from 
the shack because of XYL restrictions.

That still does not solve the problem for what happens to the balanced 
RF inside the coax when it comes to the end of the coax and finds two 
paths - one onto the intended conductor and the other onto the outside 
of the coax shield.  In this case, I believe a balun at the tuner input 
would be appropriate.

73,
Don W3FPR

Arie Kleingeld PA3A wrote:
> How about a normal L-type network? Connect one side to the balanced
> line, and the other side via a current balun to the 50 coax. The tuner
> is 'RF-floating'. (You can run the coax through a toroid or use two
> seperate wires to make the current balun.) 
> 
> 73,
> Arie PA3a
> 
> 
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