Subject: bias and ground-loop noise

From: jeg@astro.Princeton.EDU

Submitted: Wed, 18 Sep 1996 14:38:43 -0400 (EDT)

Message number: 26 (previous: 25, next: 27 up: Index)

This has been known since the beginning, though it is perhaps 
not generally known; one cannot do astronomy, after all, with the
instrument off the telescope. The noise is caused by the fact that
the telescope ground is a few millivolts away from the ground
at the coax-fiber interface box on the ground floor. The solution
is to use fibers all the way, and Jon Brinkman is working on it.

jim
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