[amsat-bb] boom type on Yagi-Uda antenna

[Larry]

Hans:

With regard to your question about poor performance on your homebrew LFA-

My understanding is that resonance is greatly affected in long boom
Yagi-Uda arrays by the boom type. It is not simply a matter of changing
the dimensions of the DE but also the parasitic element lengths and
spacing.  The ARRL Antenna book 23rd edition has a detailed section on
the new LFA and OFA antennas, and they caution readers to stick to the
'cookbook' closely or expect to spend a lot of time modeling the new
configuration.  On short booms, the differences don't make so much
difference, but when the boom gets to be several wavelengths long it is
an increasingly important factor in radiation pattern and resonance of
the parasitic elements.

The difference in width of your loop and the DE width is likely also an
issue.

Have you done any computer modeling of your design?

Larry W8ANT