[BC] KOMO Towers

[wcj9996]

Tom:

Regarding the KOMO, Seattle directional antenna.  The antenna reference 
point is midway between the end towers.  The antenna is a three tower 
"dog leg" array, which means that that the center tower is offset 10.5 
degrees from the reference point so that the pattern is asymmetrical 
around the line between the end towers.  In this case it provides two 
minima  on the East side and a single broad minima on the West side.

The towers are unequal length because the site is sloped and it was 
desired to have the lighted tops all at the same elevation for an even 
appearance at a distance.

     Walt

On 11/16/2010 10:28 AM, Tom Dimeo wrote:
> Again I'm going to show my lack of knowledge of AM
> directional arrays.  I was looking at the FCC antenna data
> for the night pattern of KOMO 1000 kHz in Seattle and wonder
> if someone would explain a bit about it to me.
>
> I understand about the different tower heights, 185, 180 and
> 170 degrees but I don't understand what the spacing and
> orientation information mean.
>
> Spacing, 105, 10.5 and 105 degrees, does this mean that tower
> 2 is only 10.5 degrees from tower 1?
>
> Orientation, 10, 70 and 190 degrees, does this mean that
> tower 1 is at 10 degrees, very slightly east of north, and
> that tower 2 is in a line of 70 degrees from tower 1 and
> tower 3 is in a line of 190 degrees from tower 1?
>
> And, if I can get another answer, is there a specific reason
> for the different tower heights?
>
> Thanks,
>
> Tom
>
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-- 
-----  walt  wcj9996 at frontier.com -----