[TowerTalk] W1JR Balun: choking impedance and power dissipation

[Chuck Counselman]

At 2:09 PM -0400 7/18/03, N2TK, Tony wrote:
>Would there be a recommendation to have one design for the high bands
>(40-160M) and one for the high bands (10-30M)? If so, how many turns 
>through the core would be recommended for each?


If I had separate feedlines for high and low bands, I would indeed 
use differently-designed common-mode chokes.  I'd probably use 
FT-240-61 toroids in both; and, to determine the numbers of turns to 
use in each, I'd measure impedance vs. frequency with different 
numbers of turns.  I haven't done this yet, and I leave for vacation 
early tomorrow morning and haven't begun to pack, so I can't do it 
for at least a couple of weeks.  I suspect that W1JR already has this 
info in hand.

-Chuck, w1HIS