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Re: LF: NEW VLF antenna

To: [email protected]
Subject: Re: LF: NEW VLF antenna
From: Claudio Pozzi <[email protected]>
Date: Thu, 18 Apr 2019 18:32:04 +0200
In-reply-to: <[email protected]>
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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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