[amsat-bb] Re: G5400 elevation issue

[i8cvs]

----- Original Message -----
From: "Dave Webb KB1PVH" <kb1pvh at gmail.com>
To: "AMSAT -BB" <amsat-bb at amsat.org>
Sent: Monday, February 07, 2011 5:16 PM
Subject: [amsat-bb] G5400 elevation issue


The display on the control box reads correct elevation,  but on my digital
display on the Easy Rotor Controller shows erratic elevation position. I
have recalibrated it several times with no success. It won't read any
elevation until it is around 20° give or take. It also seems to have become
worse since our really cold temps set in. My best guess is the pot in the
rotor, but not sure where to start in the process.

Thanks in advance

Dave - KB1PVH

Hi Dave, KB1PVH

If the display on the control box reads correct elevation then the 500 ohm
pot into the rotor is OK

By the way if the digital display on the Easy Rotor Controller shows erratic
elevation probably the rear potentiometer VR4 in the rear of the control box
of the G5400 is set erratic.

Measure the DC voltage between pins 1 and 8 on the external control DIN
connector. If the pot VR4 is set correctly the voltage must be 0 volt with
elevation = 0° and 2.5 volt with elevation = 90° and 5 volt with elevation
180° i.e. with the antenna completely flipped to 180°

The potentiometer VR4 is located in the rear of the control box as shown
in the instruction manual.

Have fun

73" de

i8CVS Domenico