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On Thursday, April 18, 2019 05:37:05 PM P. W. Schnoor wrote:
> Hi Richard,
>
> On 18.04.19 16:11, you wrote:
> > ...
> > Friends are there any news? Home made new antenna??
> > ...
>
> Yes!
>
> I removed the cases from some old VLF-crystals (got from ancient VLF-TX).
> Driving them with approx. 100 mW (those "bending" vibrators could handle
> that easily) I reached approx. 5 metres at 16.4, 17.2 and 20.8 kHz. Sending
> Morse code at normal speed was impossible due to > 0.5 sec. of relaxation
> time.
>
> BTW: the range of the acoustic emission was at least twice of that :)
>
> 73 & Happy Easter,
> Peter, df3lp
My 20 kHz piezo antenna
May be Telettra in the '69 forgot to patent this 20 kHz antenna?
Or may be SLAC re-discovered the xtal (pardon LiNbO3 ) resonator?
73 de Claudio, ik2pii
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