Re: LF: VO1NA

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

Hello Joe,

Wow, GN37, nice place! I think there is wind sometimes? ;-) Ever thought 
about a kite experiment? :-)
Question: When will you be back on 137? I remember receiving you well in 
QRSS-10 so i think its time for our QSO. What do you think?
73, Stefan/DK7FC

Am 12.10.2011 01:05, schrieb jcraig@mun.ca:
> Dear Group,
>
> I'd like to thank all those who sent their ideas. DK7FC suggested
> shunting the LF tuning coil with a series resonant LC, but ON7YD
> said it could affect bandwidth on 160m.  Stefan wondered where
> the 50 kV was coming from.  That was an upper limit guess based
> on modelling a short monopole.  1000 watts at 50 ohms is 4.47 amps.
> Feeding this into 3 mH (X=2500 ohm at 137.8 kHz) gives 11.2 kV (17 kV 
> peak) so  relays in series as suggested by G8FZK and G3NYK should work
> well.   Alan's idea of 'mechanical amplification' had cross my mind too!
>
> I'm puzzled by the 6pf/metre rule for monoploes.  It seems the 
> capacitance
> of the monopole is much higher.  Perhaps I've erred again! Please feel 
> free to critique my silly calculations above.
> The 8 WPM beacon is running on 507.77 kHz now with 80 watts to a vertical
> located at GN37.
>
> 73 and thanks
> Joe
>
>
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