That's what I expected from people who have practical experience and
understand the principles (much better than I current do).

I managed to track down thinner aluminum rod that is much closer to
scaled values of elements in the original design.

The values should be 3.78mm and I can get 3.175mm
For the 4.73mm , I can get 4.763mm.

This should now be close enough to only require small trim in length
to compensate for small change in diameter.

Tom Ring wrote:
Jim - NN7K wrote:

And, consider: even then, It might not work as it does on another
frequency. Have a friend (this years ago), who modeled the Komosko-
Johnson yagi for 2 meters (a 13 el, antenna , that was emperically

snip

in the VHF handbook, for 144)! As info, Jim NN7K


When properly done, I have never had a scaled design fail to perform as
expected. I have done several dozen. The designs were 144, 220, 222,
and 432 as source and destination.

I don't expect this one will surprise me as to how it performs,
especially as it is insulated above the boom.

tom
K0TAR