[time-nuts] OXCO Spurious Output at Line Frequencies

Bob Camp kb8tq at n1k.org
Tue Jul 12 21:04:14 EDT 2016


ummm …… errr ….. yes. 

If you mount the OCXO that drives an 800 MHz FM narrowband transmitter in the 
middle of a wall panel on the rack, you *can* measure the rotation speed of the blowers.
That’s not a guess, that’s empirical knowledge :)


> On Jul 12, 2016, at 8:24 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> kb8tq at n1k.org said:
>> All of those motors in the building are rotating at line frequency. You
>> don’t just have an  electromagnetic field. You can have an acoustic /
>> vibration field as well. Probably not a big  deal, but it’s there …. 
> Most of the medium sized motors run at slightly below line rate, and often at 
> half of line rate.  I'm thinking of the classic squirrel cage induction motor 
> vs a synchronous motor.  A quick google search found 1725 and 1750 RPM.
> Is it possible to measure things accurately enough to notice that?
> -- 
> These are my opinions.  I hate spam.
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