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

Poul-Henning Kamp phk at phk.freebsd.dk
Wed Jun 25 16:44:57 EDT 2014


In message <16957e54-f6d5-4c0a-9068-6f0c772d2082 at email.android.com>, Didier Jug
es writes:

>I think it would be perfectly appropriate to design an LF amplifier
>with 12AU7s considering the high signal levels when the storm does
>get close.

Somewhere, sometime, I saw an homebrew article for a lightning detector
which was based on some obscure valve/tube that had grid on the top
terminal.

A wire from the grid electrode ran to a porcelain isolator and from
there to the wire antenna, in order to get the highest possible
imput impedance.

I have no idea where I saw that article, but some HAM magazine or
possibly Elector about 10-20 years back is a good guess.


-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
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Never attribute to malice what can adequately be explained by incompetence.


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