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

[DaveH]

The tube was probably the FP-54 

http://frank.pocnet.net/sheets/141/f/FP54.pdf

No luck on finding the article - it is not in the Handbook of Projects for
the Amateur Scientist by C.L. Stong

http://www.sciencemadness.org/library/books/projects_for_the_amateur_scienti
st.pdf

I thought it might be as I remember there was a project to detect sferics
but this one used plain 12AU7s and 6AU6s


> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Poul-Henning Kamp
> Sent: Wednesday, June 25, 2014 13:45
> To: Discussion of precise time and frequency measurement; Didier Juges
> Subject: Re: [time-nuts] Loran, GPS, Lightning, Timing
> 
> 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
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