---- Original Message ----- From: "John Wright" ham@g4dmf.co.uk To: amsat-bb@amsat.org 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" erich.eichmann@t-online.de To: tokens@myranch.com Cc: amsat-bb@amsat.org 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