[time-nuts] 60 Hz frequency and phase measurement

[jimlux]

On 7/2/19 4:09 PM, Dana Whitlow wrote:
> I've always noted that casual attempts to pick up 60 Hz with small antennas
> etc see more harmonics and other trash than actual line frequency.  But if
> you're in an office environment, why not plug something in?  It's quite easy
> to build a simple passive diode clipper/filter that will plug into a wall
> outlet and
> which will provide a sort of soft (but clean) squarewave at a voltage level
> convenient for lab instruments and with good protection against big spikes
> and
> other trash riding on the line.


Safety approvals are one obstacle (of course one could use a AC wall wart).

Actually, it's because someone asked me about a science experiment where 
you'd place them in a neighborhood outdoors.