[time-nuts] 60Hz More or Less

Hal Murray hmurray at megapathdsl.net
Mon Apr 2 07:19:09 UTC 2012


robert8rpi at yahoo.co.uk said:
> Have a look in "The Art of Electronics" by Horrowitz & Hill (if you don't
> hav a copy, you should! or try the local libary). It has a nice circuit for
> this (Actually a telescope drive IIRC) type of application.

Rats.  I can't find my copy.

I think the trick is that it needs to drive it at sidereal time so it's off a 
bit from 60 Hz.  I forget what they start with.

What do serious (optical) telescopes use for a time base?  What did Hubble 
use?  What did they use for the Palomar Sky Survey?



-- 
These are my opinions, not necessarily my employer's.  I hate spam.






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