----- Original Message ----- > From: "Vince Fiscus, KB7ADL" <[email protected]> > To: "i8cvs" <[email protected]> > Sent: Tuesday, September 06, 2011 11:02 PM > Subject: Re: [amsat-bb] Re: Magnetic North vs True North > > > Hi domenico, > > I've always used the north star (Polaris) to set my rotor to true North or > "near" true North, and at 45.8 degrees N Lat it's easy to use the north > star to double check rotor elevation too. It's not 100% accurate. To be > 100% you might need some sort of astronomical almanac, but my antennas are > really low gain so accuracy for me isn't a problem. But I like to be > close, even so. > > 73 KB7ADL > Hi Vince, KB7ADL
I too have always used the Polaris and found this procedure very satisfactory for the accuracy and backlash of the gears in our amateur rotator for VHF and UHF antennas. For the S band at 2400 MHz and a 1.2 meter dish to calibrate the Azimuth and Elevation I use the Sun Noise but the rotators have negligible backlash and the position readout can estimate +/- 0.25° Best 73" de i8CVS Domenico _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
