[time-nuts] Timing Distribution in Mountainous Terrain

[Bob Camp]

Hi

Since the harmonics are locally generated, each site will see different crossings. The same is true of the local load impedance.

Bob



On Sep 11, 2010, at 5:54 PM, "Stan, W1LE" <stanw1le at verizon.net> wrote:

> 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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> 
> 
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