MDM Trouble Report for 2021 May 11

Telescope: 1.3m
Observer(s): John Thorstensen (Dartmouth)
Instrument: modspec + templeton

Problem(s) Encountered:
Templeton's performance is degrading, in the form of pickup-like
pattern noise with amplitude of several ADU, which is quite a few
electrons.  This stamps itself on faint spectra and makes it very 
hard to work on fainter objects -- you never know if that 20-min
exposure is going to be any good.  It's as bad as Echelle was 
getting, and appears to be a very similar issue.  I doubt if
much can be done about it, and I may be able to filter some of 
it out with enough effort, but I'd appreciate it if it's possible
to have a look at it to see if anything obvious is wrong.  I 
will try to remember to turn the controller off a the end of the 
night to see if resting it might help.  

------------------------------

Submitted on 2021 May 12 [5:02:25]