Re: [VLF_Group] Q: need spectrogram of US ELF at 76 Hz
- View SourceHi Trond and all,
I did a complete 24 hours a day monitoring from 23 November to 23 December,
recording in a 6 hours stereo wave files all the activity below 130Hz,
using two antennas:
-a big aerial Marconi (11m T with two 45m top hat) for Schumann resonances
-a 35m earth dipole N/S oriented.
There are about 2Gb of wave data: I will analyze next days with particular
attention to 76 Hz activity.
Results will be refer you here.
At 14.27 30/12/02 +0100, you wrote:
>Hello VLF Group
>Any of you who has a spectrogram of a US ELF txm at 76 Hz ?
>I would prefer a SPECTRAN or GRAM screen capture, - spectrogram, with
>scroll display ( frequency on vertical axis versus time on horizontal axis
>), covering at least 30 minutes with carrier shifts ( MSK signal present
>). If you also has info about time, date, QTH of reception as well as gear
>used, I would be very happy.
>Yes, I know this was a rather specific question, but I hope someone on the
>list has such a spectrogram image. Reason for asking is that I never (!)
>caught a 76 Hz txm here, only parts of what could be a weak carrier, but
>no shifts or other kind of intelligence to the signal. Actually I has not
>heard of a single person for the last six months, that has received an
>actual transmision at 76 Hz.
>The only spectrograms I have seen recently, were a supposed 76 Hz
>component are present, are made using ULF monitoring equipment ( induction
>coil type) with a LP rolloff at 20 Hz, - the supposed 76 Hz signal only
>visible as a very weak carrier.
>All kinds of feedback regarding the present activity at 76 Hz, are very
>A happy new lowfrequent year to everyone on the list.
>Trond at ALFLAB,
>Halden in Norway