Dave Platt wrote:

...
I saw an interesting talk at a local ham-club, at which the presenter
gave an explanation for one reason that the "effectiveness may vary"
with these sorts of choke baluns.
...

In 1982, when I worked for Boeing, they flew us to New York to attend
some lectures ...

Anyway, I remember one guy who gave an hour-and-a-half talk, complete
with slides, charts, models and other presentation aids on why the
bumblebee can't possibly fly ... it was totally fascinating, the data
looked absolutely real!--even though everyone (well, most) in the room
realized they were being "put on."

To anyone who has wound and used a few dozen chokes/baluns/ununs of
varying designs, I highly recommend the "Bumblebee Lecture."

Now, I am off to watch a few bumblebees crawl about ...

Regards,
JS