[amsat-bb] Re: Azimuth question

Dave Guimont dguimon1 at san.rr.com
Sat Jan 9 22:16:38 PST 2010

>For 144 & 432 that is probably adequate.  On 2400 the beamwidth of 
>my 33-inch dish is 10.6 deg. (24.9 dBi) so keeping a signal within 
>1dB, probably requires 3 deg beamwidth and knowing true north with 
>an accuracy of 10% of that results in 0.3 deg accuracy.
>Of course if you are doing something like eme on 1296 with a 16-foot 
>dish the beamwidth is 3.38 deg. (34.9 dBi).  For eme it is desirable 
>to track within 1db of maximum gain which may is something like 
>1-deg. and 10% accuracy is 0.1 deg.  How would you set up a dish 
>azimuth so that it is that accurate to true north?  For eme it 
>usually requires comparison with tracking sw for location of the Sun 
>or Moon.  At these freq. and dish sizes one can detect solar and 
>lunar noise to peak onto, then adjust az and el calib. to match 
>tracking sw az and el.

Yes, I used sun noise to align my 36" dish at 2.4 gigs, it was 
certainly adequate for ham work...

I've been tempted to try EME, and may yet do so....
Looks as tho any HEO is a way off, if ever...

But still counting on ESA and Peter to make it so...

            73, Dave, WB6LLO
                dguimon1 at san.rr.com

                    Disagree: I learn....

               Pulling for P3E... 

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