[time-nuts] 60 Hz line quirks, anybody recognize this stuff?

[J. Forster]

Nope.

The rise/falls are far too fast for anything connected to the grid even if
in the same house. If the thing is on the output of a UPS with a rapidly
switched load, maybe.

Any big loads, even ohmic heaters, have some inductance. I don't see any
such influence.

Try an oscillator. I suggested an HP 200 series because they have big
output, comparable to the line. Furthermore, it's impossible for such a
unit to produce an output step, if it's working right. And they are very
cheap.

A simple phase shift oscillator with one transistor would work also. I's
not use anything digital, like a DDS.

YMMV,

-John

==============


> In message <A25619B9FE5144D59D8C1FA34FC4D628 at cyrus>, "Bill Hawkins"
> writes:
>
>>I agree with others that the power company isn't doing this.
>
> Not only are they not, but it also very obvious that the source is nearby,
> since high-frequency components suffer very high damping in the grid.
>
> My guess is an electronically switched motor, likely induction design,
> and most likely in your fridge or freezer, but possibly a washer or dryer.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by
> incompetence.
>
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