I posted earlier concerning a problem I was having with 2:1 transformers
wound on BN202-73 binocular cores. The VSWR increased rapidly above about 5
mhz.
Tom, W8JI suggested that the problem may well be cores which are not, in
fact, a 73 mix. Last night, I wound up several more transformers from a
newer batch of BN202-73 cores, and all of them perform well up to 20 mhz or
so. Only the first two transformers I wound had the poor response above
80M.
So, it appears that a couple of cores which are not 73 mix got into a
previous shipment I received.
All is well! Thanks to Tom for solving the problem. I guess we often
forget the first law of survival: "never assume"!
Bill, VE3CSK
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