ETX TECHNICAL TIPS Last updated: 20 May 2005

Subject:	PE series LNT Summary (Update)
Sent:	Friday, May 20, 2005 05:54:53
From:	mhogansr@comcast.net (mhogansr@comcast.net)
Thanks to inputs from the knowledgeable folks that visit your site,
particularly Dick Seymour, I have some corrections as to how the LNT
module determines Level, North and Tilt.

The component I thought was a magnetic sensor array is actually a 2-axis
accelerometer that is sensitive to the static acceleration of Earths
gravity.  This is used to determine Level and Tilt.

North is determined by a magnetometer that changes state when the sensor
coil becomes perpendicular to the local magnetic field.  This signal is
used by the AutoStar to set the Az axis to 0 deg. at that point.  Any
corrections previously determined by a Cal Sensors procedure are then
applied.

The overall functionality of the LNT is pretty much as I described
before and this update is basically for technical accuracy.

Attached are views of the LNT board showing the major components.





Regards,
Mike

Return to the top of this page.

Go back to the Tech Tips page.

Go back to the ETX Home Page.