> We carefully plotted the bearings we took on a map of our area of
> the city.
I've often thought about attaching, say, a boat or auto compass to
the loop support....might make the plotting easier.
Does anyone know of a "good" model of compass that would
work for that purpose?
73,
Charlie, N0TT
On Tue, 01 Apr 2014 15:24:23 -0700 "Kenneth G. Gordon"
<kgordon2006@frontier.com> writes:
> OK. My son, Brendan KB7QEU and I went out after lunch and took 8 more
>
> bearings with one of Tom Thompson's loops which I had constructed
> over
> the past few days.
>
> Tom's loop tunes VERY sharply. I intend to add a bandswitch, a large
> scale,
> and a vernier dial to it to make it both easier to peak and easier
> to take down
> a data point.
>
> We carefully plotted the bearings we took on a map of our area of
> the city.
>
> I connected the loop to the FT-890 in AM mode (BW 6 KHz), tuned to
> 3573.5
> KHz where "my" noise peaks, and used the FT-890's "S" meter to take
>
> readings.
>
> First of all, the nulls are not quite as sharp, nor as deep, as
> those I get with a
> shielded loop, but they suffice. (The shielded loop I was using
> would
> commonly show a difference from null to peak of over 30 db, while
> the
> unshielded loop most often provides a difference of only about 10
> db).
>
> The results we plotted are somewhat confusing to me as three of the
>
> bearings did not result in anything common to the other five.
>
> 4 of the bearings definitely converge on an area that appears to be
> around
> an area of about 1 square block which is 4 blocks east of us.
>
> A 5th is close, but outside the convergence zone of the other 4.
>
> Signal strengths became greater as we got up on a hill to the east
> of my
> station which is also nearer to that 1 block area than some other
> bearings.
>
> Those three bearings that gave confusing results were the weakest
> ones,
> and the differences between the null and a peak were only about 1
> "S" unit.
>
> However, one odd thing is that two of those three bearings, if I
> take a 90
> degree normal bearing to those, both show up in the same area as the
> 4
> "good" bearings. One, in fact, is exactly coincident at its end with
> two of the
> other "good" bearings.
>
> I don't know how to read those odd ones, but I am not in the habit of
>
> throwing out data points just because they don't "fit" either. So I
> don't know
> what to do about them right now.
>
> I suppose I should drive over to that spot 4 blocks east of us and
> take a look
> around, then take some more bearings.
>
> Probably tomorrow...
>
> Ken W7EKB.
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