I have not heard of the FSL antenna up till now. Is there a site somewhere
with construction details? What kind of ferrite rod? (What is the best type
of material? 61? 77?). Will these work in the LF range? (down to 100 kHz)?
Zack W9SZ
On Thu, Jan 27, 2022 at 1:48 PM Paul B. Walker, Jr. <
walkerbroadcasting@gmail.com> wrote:
> I have 2 5" FSL antennas and they do just that.. one can do reception and
> one can null. The 5" FSL's out perform box loops 3-4 feet in size.
>
> I didnt want to totally null things out in this case, to show an example of
> what I heard as I heard it
>
> Paul
>
> On Thu, Jan 27, 2022 at 10:40 AM Rick Kunath via groups.io <k9ao=
> yahoo.com@groups.io> wrote:
>
> > Paul,
> >
> > I wonder if a 4-foot box loop (box not spiral, i.e. the NRC design)
> > would let you null that offending station? You should be able to do that
> > using a combination of rotation in azimuth and tilting in elevation,
> > then back and forth to get the null deep enough to take them out. Back
> > when I had strong locals I was able to do that using that loop. You ahve
> > to be careful to get the loop balance just right. That's not hard to do
> > if you follow the directions. And then you get a good really deep null.
> >
> > It might be worth a try and you'd have another tool.
> >
> > Have you tried tilting and rotating the FSL at all? Assuming the
> > internal loopstick on the portable doesn't get any of the offending
> > station. Otherwise nulling is harder. I would think that would work the
> > same way an air-core loop does. I know the ferrite bar loops I built
> > back in the day worked that way.
> >
> > Rick Kunath, K9AO
> >
> >
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