On this page are a number of spectograms from Low Frequency radio signals. Information about spectrograms can be found on the spectrogram page at: http://www.xs4all.nl/~misan/gram50.htm. You can enlarge the pictures by double-clicking on each picture or select the hyperlink below the picture.

A) Input scan settings	B) Colour settings

These settings are a little different from the settings on the spectrogram page. The audio power levels for drawing the audio frequency spectrum are now divided in to three groups. Red/yellow are the loudest signals. The blue group are signals below a ceirtain level. The green group are signals -10dB or more below the average noise level  

The first spectrogram shows a radio transmission by the Amateur station DF3LP on 137.678 kHz, received 07:30 UTC on July 25 th 1999. The second audiogram is a transmission by the Amateur station HB9ASB on 137.734 kHz, received 06:45utc on July 25th 1999. 

Image number 5 shows the sferics conditon (lightning strikes) over Europe on july 25th. 1999.

Copyright HTML page including illustrations M.Sanders 1999. Sferics images provided by the Georg Mueller Institute.

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