# RE: Re: True North

```Sorry, it was unclear....They must also be equal distance from the mast as
they will of course be parrallel.

Also, you could turn the yagis 90 degrees (azimuth and elevation) and make
sure their shadows fall exactly within the mast shadow...this works well for
my 4 yagi array where I make sure the shadows from the yagi over lap AND are
parrallel
> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> Behalf Of Estes Wayne-W10191
> Sent: Friday, February 09, 2001 11:11 AM
> To: amsat-bb@AMSAT.Org
> Subject: [amsat-bb] Re: True North
>
>
> Scott Olitsky wrote:
>
> I find an easy and very accurate method is to use a tracking
> program to find
> the exact time the sun will be at a specific azimuth, look for
> the mast...this will be 180 degrees opposite the sun position.
> Now turn the
> yagi so that its shadow is aligned with the shadow for the mast.  This
> should be accurate to within a few degrees.  For those with 2
> yagis, elevate
> them to 90 degrees and line up all 3 shadows so that they are perfectly
> parallel.
>
> Wayne replies:
>
> You lost me on the last statement.  If the two Yagis are at 90 degrees
> elevation their booms will be parallel to the mast, and the 3
> Yagis and mast will be parallel regardless of the azimuth of the
> rotor.  The
> spacing between the 3 parallel shadows will change as the azimuth is
> changed, but the shadows will remain parallel.
>
> Did you intend to suggest putting the Yagis at 0 degrees elevation?  Then
> the Yagi shadows would be parallel with the mast shadow when the Yagi
> azimuth matches the sun's azimuth.
>
> Wayne Estes W9AE
> Mundelein, IL, USA
>
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