[evlatests] Strange Tcals and Switched Power behavior

Ken Sowinski ksowinsk at nrao.edu
Mon Nov 1 14:14:11 EDT 2010


On Mon, 1 Nov 2010, Rob Long wrote:

> I looked at these antennas and don't believe that the LO timing is off by 10 
> ms (in the antenna). Did we see this problem before the power outage?

The problem likely lies at the antenna.

I recorded one second of TP data from a T304 at 500 Hz.
The noise tube signature is very obvious at 20 Hz with
a duty cycle of about 30% on and 70% off, instead of the
expected 50-50.





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