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Re: ULF: 5 wavelengths on the 101 km band? Valid or not?

To: [email protected]
Subject: Re: ULF: 5 wavelengths on the 101 km band? Valid or not?
From: g3zjo <[email protected]>
Date: Sat, 11 Feb 2017 14:22:29 +0000
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Hi Stefan

I am convinced, but do it again.

On UK TV many years ago there was an advertisement  for car tyres, they didn't use an actor but an ex chief of police to say "I am convinced that this is a contribution to road safety". The one thing he didn't sound was convinced. I cant write with that tone in my voice. :-)

73 Eddie G3ZJO

On 11/02/2017 13:49, DK7FC wrote:
Hi all,

Meanwhile my 1 week taking transmission, starting  01.FEB.2017 23:30 UTC on 2970.000000 Hz at 150...170 mA is completed. I tried to leave a trace/peak into a range beyong 3 wavelengths.

Renato Romero / IK1QFK is running a 5 uHz FFT spectrogram on 2970 Hz. He's using a well working E field antenna in Cumiana/Italy.
The spectrogram is running since christmas evening 2016, available at

There are time markers in 1 week intervals.

I can see a dash, a trace right on the frequency. It appeared 2 days after i started transmitting, which is expected with an FFT window time of nearly 3 days. The SNR was up to 12 dB during the visual observation of incoming spectra.
Partly, the trace disappered during the transmission time (destructive interference with QRN). However i can see a resulting trace of a high average SNR and exact (!) frequency stability relative to the other traces beeing present in the spectrogram.

I would tend to call it a serious detection of my signal. Spectrogram experts, what's your opinion please?

The distance is quite exactly at 5 wavelength on that 101 km band!
It would be a first detection on ULF (0.3...3 kHz) between DL - I !

73, Stefan

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