---- Original Message ----- From: "John Wright" <[email protected]> To: <[email protected]> Sent: Thursday, November 29, 2012 5:40 PM Subject: [amsat-bb] Re: G5400B Rotor Problem
> At 21:00 28/11/2012, you wrote: > >Got some unexpected time today to look at the rotor. First I set the > >output at pin 6 of the external control output jack to 5.0 V. Then I > >got readings every 45 deg from 180 at the left to 180 on the right. > >The readings are of course subject to parallax in reading the > >needle. Readings from 180 on the left to 180 on the right were > >0.024, 0.606, 1.270, 1.864, 2.489, 3.074, 3.690, 4.350, and 5.000 V. > > > Draw a graph of AZ vs Voltage... It should be a straight line, if > not, the pot is not linear! > Hi John, G4DMF I agree with you and draw a graph of AZ versus Voltage to see if it is or not a straight line is a very good idea but you don't want to read the AZ on the control-box meter because the meter can be not linear. BTW the idea to read the AZ as Erich DK1TB did is to me the best procedure. In a previous message on Amsat-BB Erich writes : ----- Original Message ----- From: "Erich Eichmann" <[email protected]> To: <[email protected]> Cc: <[email protected]> Sent: Thursday, November 29, 2012 7:52 AM Subject: [amsat-bb] Re: az-rotor < snip> I mounted the KR-600X in the shack over a big 360° linear scale with 1 m diameter and with a pointer that moved around the scale close above it. The rotor ran exactly an 360° turn from the starting position 180° in the south to the end position 180°. -------------------------------------------------- 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
