I think, others will correct me if I am wrong--the "optimal" number of turns
would would present an impedance of 4x (four times) the impedence
(resistance) of the load/feed, at the lowest freq of operation... sometimes
this cannot be met, and other values must be used... you should be able to
compute this with the "Al" value of the toroid--with data from the
manufacturer...
Remember, I am a "newbie", greater authorites will provide finer details...

Warmest regards,
John

"Fred W4JLE" wrote in message
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| Using a T200A-2 for a 1:1 balun, what is the optimum number of turns and
| best wire size? 200 watts max power.
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