[time-nuts] Timing Distribution in Mountainous Terrain

Stan, W1LE stanw1le at verizon.net
Sat Sep 11 21:54:27 UTC 2010


  If the odd harmonics were filtered out, would the zero crossing of the 
60 (50) Hz fundamental
be stable enough ?

Thanks   Stan,    W1LE      Cape Cod      FN41sr




On 9/11/2010 5:08 PM, Bob Camp wrote:
> Hi
>
> You also have load dependent harmonic energy on there that messes up the zero crossings at the micro second level.
>
> Bob
>
>
>
> On Sep 11, 2010, at 3:45 PM, "Poul-Henning Kamp"<phk at phk.freebsd.dk>  wrote:
>
>> In message<8459B572-1428-4F6A-8375-AFB4F7225945 at cox.net>, "Thomas A. Frank" wr
>> ites:
>>
>>> If so, being within 300 miles of each other suggests that they are
>>> most likely all on the SAME section of the grid, in which case the
>>> phase time of arrival of the electric power waveform should be
>>> constant between them (the zero crossing may not be perfectly
>>> aligned, but it should always be the same differential).
>> Won't work.  Utility transformers have load-dependent parasitics
>> which mess this up.   It is one of the biggest challenges in
>> doing "autonomous cell based grid control" and similar schemes.
>>
>> -- 
>> 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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