Tony I0JX
I don't think it is the balun. I measured a 4:1, 1/2 wave 6m balun made of
LMR240 and got a 2:1 SWR bandwidth from 40 to 60 MHz. This was with an MFJ-269
and about a foot of 50 Ohm coax. Load was a 1/2 W 180 Ohm resistor (measured
high).

You are right, it is not a balun problem. It is a problem due to the reasons I
had explained in my post, which had nothing to do with the balun.

73

Tony I0JX.