[Lowfer] LF interference - slightly off topic...

[Zack Widup]

If you see people working with them, maybe you can go and ask them what
they're doing?

73, Zack


On 3/4/09, Howell, Laurence (Shanghai/Singapore) <
L.Howell at conocophillips.com> wrote:
>
> Thanks to all - yes I searched Google images under geophones and there
> was a Chinese manufacture, as they
> More than resemble those in situ and causing more than the normal trip
> hazards.
>
> Well done Mike and others - They guys are sitting in a small dome tent,
> with a bowl and water jug so probably living in there -
> that tent is small doesn't appear to be "mains connected" but they maybe
> over a manhole. They appear to be gradually working their way thru the
> city and
> Dressed up in very elegant red coveralls.
>
> I note that this is a seismic active area or they are looking for
> something else.
>
> The reason I started this was pulsing noises in the low KHz range around
> 9kHz which were very strong, with harmonics at 137kHz -  and were
> Coming from my antennae "array" (the baby bottle) and not internal to
> house (that's why I mentioned it here)
>
> I've still not determined this intermittent sources location but instead
> Of hammering the ground is often done I wonder if they are using another
> higher freq sounder/transducer?
>
> Anyway its not there late this evening but there again they don't appear
> to work at night.
>
> The golf course is covered with them here too - arrays are 24 phones in
> a 6 meter separated grid where they have
> Room.
>
> I should have known what I was looking at as I'm in that industry :-)
>
> Laurence
>
> -----Original Message-----
> From: lowfer-bounces at mailman.qth.net
> [mailto:lowfer-bounces at mailman.qth.net] On Behalf Of mikea
> Sent: Tuesday, March 03, 2009 2:23 PM
> To: Discussion of the Lowfer (US, European, &amp;UK) and MedFer bands
> Subject: Re: [Lowfer] LF interference - slightly off topic...
>
> On Tue, Mar 03, 2009 at 10:46:22AM +0000, Dave Pick wrote:
> > Laurence
> >
> > What are they cabled to? Control box, mains...?
> >
> > Dave 'YXM
> >
> > 2
> I think those are geophones. I'm used to seeing them out in the wild,
> used
> by oil surveyors to detect echoes from rock layers and structures after
> a
> blast or a thump from a thumper truck. They're a rather common sight in
> Texas and Oklahoma, but I've never seen them pounded into a sidewalk
> before.
>
> Interesting ... .
>
> --
> Mike A
> ______________________________________________________________
> Lowfer mailing list
> Home: http://mailman.qth.net/mailman/listinfo/lowfer
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Lowfer at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Lowfer mailing list
> Home: http://mailman.qth.net/mailman/listinfo/lowfer
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Lowfer at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>