Daniel Marks@tk Is this a 4:1 Guanella balun (50 ohm side parallel windings, 200 ohm side in series)? Winding the two sets of turns couples their flux together, and the balun action is adversely affected. Each of turns should be on a separate toroid. Also, a 43 or 61 mix is generally used for transformers to get the maximum impedance.
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