[CQ-Contest] Balun design
guy_molinari at hotmail.com
Sat Feb 4 14:32:53 EST 2006
I need a balun design to match 50 ohm unbalanced to 100 ohm balanced (2:1).
I have a T-200-2 core and am winding it as follows:
A bifiliar winding with one long and 1 short wire. This goes for 12 turns
and then the shorter wire stops at the halfway point. The longer wire
continues for 12 more turns.
When I test it with my MFJ-269 (2 50 ohm resistors in series), the best SWR
I get is 2.1:1. The resistive and reactive values are both about 45 ohms.
I've tried removing/adding turns to the primary and secondary windings and
the SWR gets worse.
Am I missing something? Is there a better way?
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