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Re: Calibration of antenna pointing with an off-center feed(N3IYR)dish for AO 40



At 11:07 PM 4/29/2003 +0000, William P Gravett wrote:
>Hi folks
>
>Anybody got a cool simple way to check pointing calibration on an offset
>feed dish???
>
>
>Thanks,73
>
>Bill, W5PGZ    
 
Yes Bill:

The same sun-shaddow method used for center-fed dishes, except you align
the dish so the feed casts a shadow at the very bottom edge of the dish
edge (near where the feed arm runs).  Works well for most DSS and similar
sat-TV dishes.

When you have the shadow as described compare you rotator indications with
a computer tracking program (such as NOVA) fo the sun.  If not in agreement
then loosen and adjust the roator until they agree.  More accurate than
using a compass.

73, Ed - AL7EB

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