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Discussion of precise time and frequency measurement

OXCO Spurious Output at Line Frequencies

Poul-Henning Kamp

Wed, Jul 13, 2016 8:18 AM

In message 8BDE1988-7C6B-4A20-9CBC-927CD8E85A2F@n1k.org, Bob Camp writes:

Simply running test gear on batteries did not do the job. Ultimately we
wound up in the middle of an Illinois corn field with a bunch of gear
modified to run purely on batteries. The spur did go down, but it never
fully went away.

Illinois is not going to be particular quiet place in that respect.

There are a lot of very big antennae all over the civilized world,
in the form of power transmission lines, and they radiate when their
phase-loading is not perfectly balanced.

As antennas they're horribly inefficient, the wavelengths are
five and six thousand kilometers, but they do have the advantage of
the the biggest transmitters in the world, and they are all phase
synchronized in rather large geographies.

Dome C on Antartica is probably your best bet these days, provided
you get far enough away from the gensets.

Poul-Henning

PS: I've heard from several sources a saga about when South Africa
inaugurated the worlds longest high-voltage line, from hydropower
at the north of the country to consumers a the south, and very
little power came out at the far end. The punch linie being that
orbiting space-craft suffered a lot of 50Hz field strength while
they debugged that issue.

--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@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.

-------- In message <8BDE1988-7C6B-4A20-9CBC-927CD8E85A2F@n1k.org>, Bob Camp writes: >Simply running test gear on batteries did not do the job. Ultimately we >wound up in the middle of an Illinois corn field with a bunch of gear >modified to run purely on batteries. The spur did go down, but it never >fully went away. Illinois is not going to be particular quiet place in that respect. There are a lot of very big antennae all over the civilized world, in the form of power transmission lines, and they radiate when their phase-loading is not perfectly balanced. As antennas they're horribly inefficient, the wavelengths are five and six thousand kilometers, but they do have the advantage of the the biggest transmitters in the world, and they are all phase synchronized in rather large geographies. Dome C on Antartica is probably your best bet these days, provided you get far enough away from the gensets. Poul-Henning PS: I've heard from several sources a saga about when South Africa inaugurated the worlds longest high-voltage line, from hydropower at the north of the country to consumers a the south, and very little power came out at the far end. The punch linie being that orbiting space-craft suffered a lot of 50Hz field strength while they debugged that issue. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@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.

Van Horn, David

Wed, Jul 13, 2016 6:06 PM

Perhaps the aliens are replying to our signals, mostly saying "SHUT UP!!!"

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Poul-Henning Kamp
Sent: Wednesday, July 13, 2016 2:18 AM
To: Discussion of precise time and frequency measurement; Bob Camp
Subject: Re: [time-nuts] OXCO Spurious Output at Line Frequencies

In message 8BDE1988-7C6B-4A20-9CBC-927CD8E85A2F@n1k.org, Bob Camp writes:

Illinois is not going to be particular quiet place in that respect.

There are a lot of very big antennae all over the civilized world, in the form of power transmission lines, and they radiate when their phase-loading is not perfectly balanced.

As antennas they're horribly inefficient, the wavelengths are five and six thousand kilometers, but they do have the advantage of the the biggest transmitters in the world, and they are all phase synchronized in rather large geographies.

Dome C on Antartica is probably your best bet these days, provided you get far enough away from the gensets.

Poul-Henning

PS: I've heard from several sources a saga about when South Africa inaugurated the worlds longest high-voltage line, from hydropower at the north of the country to consumers a the south, and very little power came out at the far end. The punch linie being that orbiting space-craft suffered a lot of 50Hz field strength while they debugged that issue.

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Perhaps the aliens are replying to our signals, mostly saying "SHUT UP!!!" -----Original Message----- From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Poul-Henning Kamp Sent: Wednesday, July 13, 2016 2:18 AM To: Discussion of precise time and frequency measurement; Bob Camp Subject: Re: [time-nuts] OXCO Spurious Output at Line Frequencies -------- In message <8BDE1988-7C6B-4A20-9CBC-927CD8E85A2F@n1k.org>, Bob Camp writes: >Simply running test gear on batteries did not do the job. Ultimately we >wound up in the middle of an Illinois corn field with a bunch of gear >modified to run purely on batteries. The spur did go down, but it never >fully went away. Illinois is not going to be particular quiet place in that respect. There are a lot of very big antennae all over the civilized world, in the form of power transmission lines, and they radiate when their phase-loading is not perfectly balanced. As antennas they're horribly inefficient, the wavelengths are five and six thousand kilometers, but they do have the advantage of the the biggest transmitters in the world, and they are all phase synchronized in rather large geographies. Dome C on Antartica is probably your best bet these days, provided you get far enough away from the gensets. Poul-Henning PS: I've heard from several sources a saga about when South Africa inaugurated the worlds longest high-voltage line, from hydropower at the north of the country to consumers a the south, and very little power came out at the far end. The punch linie being that orbiting space-craft suffered a lot of 50Hz field strength while they debugged that issue. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@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. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.