On 18.04.19 16:11, you wrote:
Friends are there any news? Home made new antenna??
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,
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