[time-nuts] Loran, GPS, Lightning, Timing

[Max Robinson]

How fast does the maltese cross turn?

Regards.

Max.  K 4 O DS.

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----- Original Message ----- 
From: "Neville Michie" <namichie at gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Wednesday, June 25, 2014 10:46 PM
Subject: Re: [time-nuts] Loran, GPS, Lightning, Timing


> Is anyone using a field mill?
> I have always been going to make one.
> It consists of a horizontal metal plane with a conducting button on the 
> surface
> which is insulated from the ground plane.
> A metallic maltese cross driven by a motor alternately covers and uncovers 
> the electrode
> exposing/not exposing it to the sky.
> The electrode button has capacitance to ground which drops its impedance,
> but across that impedance is an AC voltage proportional to the ambient 
> static field.
> A typical field in fine weather is 300 Volts/metre  so the signal is not 
> trivial.
> You should be able to make a field mill that works continuously except 
> when
> actually shorted by rain.
> This is not a very high impedance device, and should show many marvellous 
> things
> as the clouds float over you.
> You can calibrate it with a metal plate, say 12 inches above it with 50 
> volts on it.
> That should produce a uniform field on the mill.
> cheers,
> Neville Michie
>
>
>>
>> I know you are talking about measuring lightning strikes but if you get 
>> the
>> impedance high enough, you can actually measure the earth's electric 
>> field.
>> (It is about 200V/m if I recall properly.) Interestingly it is affected 
>> by
>> the solar flux and solar wind.
>>
>> -- 
>> Brian Lloyd
>> Lloyd Aviation
>> 706 Flightline Drive
>> Spring Branch, TX 78070
>> brian at lloyd.com
>> +1.916.877.5067
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