Topband: binocular matching transformers

[Pete Smith N4ZR]

Please have mercy on a history major...

I'm trying to wind a binoocular core matching transformer for 75-ohm 
coax to a BOG with (for a start) 270 ohms of terminating resistance.  I 
figure that is a 4:1 stepdown, which should require a turns ratio of 
2:1.  Initially I wound a #73 core with identical windings, 3 passes each.

I put this on the output of my MFJ-259 with a 270-ohm resistance on the 
secondary.  To my surprise the MFJ read 135 ohms, not 270 as I would 
have expected.  Is this not appropriate as a way of measuring the 
transformer?  Should I just go ahead and wind 2:1, and if so, how many 
turns/passes are appropriate for 160M?

-- 

73, Pete N4ZR
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