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

Alexander Pummer alexpcs at ieee.org
Wed Jun 25 23:55:17 EDT 2014


Charley Wenzel made it very safe: here is 
http://www.techlib.com/electronics/lightning.html,
I used cross-correlation to identify the "right electrical noise"
Alex
On 6/25/2014 8:22 PM, Brian Lloyd wrote:
> On Wed, Jun 25, 2014 at 4:42 PM, paul swed <paulswedb at gmail.com> wrote:
>
>> I am currently using a 12AX7 as a ELF preamp and have for years.
>> A note in the coldest part of winter preheat the tube low filament voltage.
>> They tend to fracture.
>> It sits 200 ft from the house as far away in the woods as possible.
>> That said and back to the thread. At these frequencies tubes do work. The
>> 12AX7 can be found on vlf.it and numbers of tubes will work. They run 12 V
>> on the plate. They also stand up to nearby lightning very well.
>> So Diddier now you have no excuse. I can't wait to implement your design on
>> one of my stm boards. Not sure how to get this back on time-nuts topics
>> Regards
>>
> Try a 6DJ8 instead of the 12AX7. It has a higher GM and a LOT more
> bandwidth. What kind of risetime are we talking about for a lightning
> strike? And why not a loop antenna? That should provide plenty of signal
> but not destructive voltages.
>
> 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.
>



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