[time-nuts] 60Hz extra PPS: got one
Lester at veenstras.com
Fri Aug 10 18:13:01 UTC 2012
Software 60Hz PLL
Lester B Veenstra MØYCM K1YCM W8YCM
lester at veenstras.com
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From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Hal Murray
Sent: 10 August 2012 13:37
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 60Hz extra PPS: got one
bill at iaxs.net said:
> Hal, do you have a resonant 60 Hz filter in the pickoff?
Not by intent. It's just a wall-wart transformer and then some resistors to
get the right level. There are the standard cables (wall wart, RS-232,
audio, clip leads). I'm sure there are resonances in there but nothing near
> Remote-controlled tap changers can do things like that.
Here is a graph with the vertical scale zoomed in on the top of the sine
peaks so you can see the voltage step.
> I expect you'd rather do things in software, but the mechanical solution
> to couple a synchronous motor to a flywheel marked with 60 Hz lines for
> photocell pickup.
Good idea. Or an old clock motor. Do they still make motor driven clocks?
The kind with the flag that drops down and turns red on a power loss rather
than blinking 00:00.
I should be able to do something with a simple L-C. I'll have to check the
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