[Elecraft] Balun for KAT2

[Charles Greene]

At 02:12 PM 1/18/2002 -0500, Bill Coleman wrote:

That sounds good to me Stuart.   My next project is going to be to 
investigate the use of the W1JR balun into a balanced open wire 
line.  There might be some advantage to using the 4:1 balun over the W1JR 
but I don't have any data on that either way.  If some one knows how to 
measure the impedance of a 1:1 balun using beads, please tell me.


>On 1/18/02 2:00 PM, Stuart Rohre at rohre@arlut.utexas.edu wrote:
>
> >Bill has a good summary of the detailed balun issues, but the original
> >discussion downplaying baluns missed the point of using one with the K2 was
> >to facilitate true balanced feed to a parallel line feeder, typically at
> >some step up ratio other than 1:1 of the coax chokes or bead baluns.
>
>If you have a reactive load (which is typical of a single all-band
>doublet fed with open wire), then you really don't care. You're not going
>to get the 4:1 or 9:1 transformation you might hope for with a voltage
>balun anyway. So, you might as well use a way-over-ratings (to avoid any
>possibility of core heating) 1:1 balun and let the KAT2 figure out the
>impedances.
>
>
>Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr@arrl.net
>Quote: "Not within a thousand years will man ever fly!"
>             -- Wilbur Wright, 1901

73, Chas, W1CG