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'Power Line detecting [OT]'
1998\11\28@114918 by Richard Parsons

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Hi there all

a bit of a question, who knows how to detect high voltage AC power lines (overhead ones) from 30meters and above? I need to know when I am near one and have enough time to react.

Regards
Richard Parsons

1998\11\28@133500 by Don Holtz

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You could try and E-field detector.  Basically a simple whip antenna, with
a FET amplifier stage.  I guess a loop antenna would be more directional
and disctriminating.

To make this specific to power lines, you would need a 60Hz filter of some
sort.  This could be implemented with a PIC A/D easily enough.

Good examples of suitable circuitry (without the filter) can be found by
search the web for VLF , VVLF receivers.  People use them for listening to
RF being given off by the Aurora Borealis (SP), and other interesting things.

Cheers,
Don

At 06:32 PM 11/28/98 +0200, you wrote:
>Hi there all
>
>a bit of a question, who knows how to detect high voltage AC power lines
(overhead ones) from 30meters and above? I need to know when I am near one
and have enough time to react.
>
>Regards
>Richard Parsons
>
>

1998\11\28@145305 by Reginald Neale

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Richard:

Electronic Goldmine has one for about $10USD.
>
>a bit of a question, who knows how to detect high voltage AC power lines
>(overhead ones) from 30meters and above? I need to know when I am near one
>and have enough time to react.
>
>Regards
>Richard Parsons

1998\11\29@125227 by Peter L. Peres

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On Sat, 28 Nov 1998, Richard Parsons wrote:

> Hi there all
>
> a bit of a question, who knows how to detect high voltage AC power lines (over
head ones) from 30meters and above? I need to know when I am near one and have e
nough time to react.

A ferrite antenna wound with as much wire as you can fit on it followed by
an active notch filter at 50 (or 60) Hz will do that. The antenna bar is
to be vertical of course.

hope this helps,

Peter

PS: Do you approach it from front, below, or above ? ;) BTW the method
above only works with an energized line, as opposed to un-energized ones,
knowing that both kinds are very good at downing choppers, aircraft and
tall cranes. For non-energized ones, a modified doppler alarm unit might
work.

You get to know your vehicle speed somehow and expect the LF from the
alarm to relate to that speed (knowing the frequency of the microwaves
used) if you are approaching something metallic dead on. Two or more units
can be combined to give a kind of 'array' that will tell you more.

Doppler alarms are known to work from 10 meters and more against a solid
metal target if the amplifier is tweaked a little bit.

1998\11\30@034552 by Dr. Imre Bartfai

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Hi,
there are some low-cost pocket-sized live-wire detectors (I do not know
how they are called in English). I have some. There are such things with
LED and buzzer. They are sensitive enough to detect high voltage lines
overhead in some meter round. Furthermore, there is some DIY kit e. g. at
Conrad. I use such pocket detector (costs about $5). It does it fine. Even
Fluke manufactures this things.

I hope this helps.

Imre


On Sat, 28 Nov 1998, Richard Parsons wrote:

> Hi there all
>
> a bit of a question, who knows how to detect high voltage AC power lines (over
head ones) from 30meters and above? I need to know when I am near one and have e
nough time to react.
>
> Regards
> Richard Parsons
>
>

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