The 4 el 40m optibeam yagi uses de-coupling stubs on each ele half..on all 4
x eles. This is done so the array doesn’t resonate on 15M.
Ok, so where does it resonate then? It has to resonate somehwere if not on
its 3rd harmonic. The F12 340N resonates around 24 mhz..and will screw up
a 12m yagi....
yet the 340n does not use the de-coupling stubs.
Has anybody with an optibeam 4 el 40m yagi swept it with a MFJ-259B or an
xcvr on low power..to see if and where it does resonate. ( freqs other than
40m obviously)
Tnx... Jim VE7RF
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