Gee. Didn't we do this a few months ago? Tell me what HF beam has
such a narrow bandwidth that a few degrees, one way or the other, will
make one iota of difference? Personally, I use the North Star. It's
close enough.
73, Gene...N2BIM..>>
dlhough@vegas.infi.net wrote:
>
> zeitler@ibm.net wrote:
> >
> > Esteemed Reflectees,
> > I should remember this being an old Navy TACAN tech but........
> >
> > When aiming my rotor, I have my magnetic compass sitting right under the
> > boom of my quad. Actually lying flat on the roof with the tower retracted so
> > I can manually point the beam. I visually line up the boom with the compass.
> > Okay so far. In order to aim the beam at "true" north I would actually want
> > it pointing at 012 degrees if I have a magnetic correction of 12 degrees,
> > right? of course the rotor also needs to be sitting at 12.
> >
> > Help!!
> >
> > Lane Zeitler
> > KM3G
> > IFF and TACAN tech
>
> Hope I might be of some help. The easiest way to orient North is to
> use
> a plumb bob - a lead sinker on a string will do fine - then go out at
> night and eyeball the North Star through the mast and string. Put a mark
> on the ground. Then in the daytime eyeball a line through your plumb
> line and the two ends of the boom. You will be able to get this within a
> few minutes of arc.
>
> Not bad considering the divisions on the rotor indicator are 5 deg.
> each.
>
> I've found that by plumbing a long straight stick over my ground mark.
> >From the top of the tower I can also eyeball through the mast, the end
> of the boom and the stick to within a few minutes of arc.
>
> Problem is magnetic North is subject to several variations including
> an
> annual and a daily variation. It's not much, certainly less than a
> division on the rotor dial, but it still exists.
>
> 73
>
> Dave Hough, KC7DM
> Las Vegas
>
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