Hi Michael.
Depends on the bandwidth of the modulation and the transmit power
But as a rough guide, I used a 12 turn helix with about 10 degree pointing accuracy with AO-51.
That's not good, but it works.
However, if you take the HAMTV equipment on the ISS, then you need a lot more gain on the ground and pointing accuracy of 2 degrees or better.
Thanks
David G0MRF
-----Original Message----- From: michael luft milu111@gmail.com To: amsat-bb amsat-bb@amsat.org Sent: Thu, Sep 5, 2013 7:42 pm Subject: [amsat-bb] S band LEO Sat tracking
What kind of positioning accuracy can be expected form amateur PC Software and Antenna Rotators? Or, in other words: What kind of S band antenna ( gain or dimensions) is needed to track a S band LEO Sat?
73 Michael _______________________________________________ Sent via AMSAT-BB@amsat.org. 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