Reg Edwards wrote:
How do you select a good choke balun from amongst all the others.

I roll my own. I have 8 FB-77-5621 cores over a piece
of RG-400 in series with an FT-240-61 with ten turns of
RG-400. The latter comes in a ~$10 balun kit from Amidon.
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73, Cecil http://www.qsl.net/w5dxp