[CQ-Contest] 40M "Woodpecker"

[VR2BrettGraham]

K8CC added:

> >Remember, a rotary doublet (as in a non-reasonant dipole) will show
> >good nulls off the ends.  The direction(s) null(s) is/are seen off the
> >sides & back of a beam can be even more helpful than where the
> >signal peaks from.
>
>I'd point out that not all beams have nulls directly off the back.  Many
>yagi designs have a lobe straight off the back with nulls somewhat off the
>main axis.
>
>Before you start trying to DF off of nulls, you'd better figure out where
>the nulls are.
>
>In that regard a rotary dipole is the most certain tool, because you know
>there are only two nulls, and they're obvious!

Roger that, Dave!

Peaks are rather broad, but knowing what is being used & where
the nulls are being seen, something more accurate might be able
to be figured out.

It was nulls off the back & rear quarters of a quad that concluded our
chase for the 12m sea surface radar in mainland China - might not
be able to do this by remote so well as in person, but with care it
can be made to work.

73, VR2BrettGraham