[Antennas] How to roll up additional balanced line?

Sun, 17 Feb 2002 18:12:31 -0600

I never thought you could roll up this stuff,  the impedance BUMP would be huge!
and maybe even end up being a choke.
It is not like coax where it is shielded. the magnetic field extends well past
the conductors of a balanced line. That's why you can't get it near anything
metal it will not only mess with the impedance but the balance as well.  Coiling
it has to just totally mess up the characteristics of the line something
terrible I would think.

Joe WB9SBD

Chris BONDE wrote:

> At 04:09 PM 2002-02-17 -0500, Joe Falcone wrote:
> >Hello:  I have about ten extra feet of commercially made 450 ohm ladder
> >line between the radio and the window in the shack.  I don't know if I
> >will be moving the radio
> >around the room and did not want to cut the excess line.  What method is
> >appropriate to store/secure/roll up this line, or doesn't it matter?  Or,
> >would I just be better off
> >cutting it?  And, can you just simply solder this stuff together to make
> >it longer?  Thanks, Joe.
>
> I like this question!
> I have been told NOT to cut off any 450 window line as it is part of the
> antenna as designed, if needed roll it in a loop, min diameter 6ft or it
> will act as an inductor.
>
> I have seen some comments on various length of the line, plus multiples of
> stated lengths.  I would like to see an answer that has some theory  plus
> experimentation behind the answer.
>
> Chrsi opr VE7HCB
>
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