Hi Stefan,

A VLF grabber would be very fine! If you can arrange that, it would perhaps be a motivation for the dreamers ;-)
 

Well there are two now (Markus' and Paul's) .. I will try to add a third but need to get away from the local QRM. The plan is to use an UHF FM link to the remote, battery-powered site but there are some issues to be solved - one of them is the lack of dynamic range of the FM transmitter/receiver, so I may have to add some analog bandpass filtering before the FM modulator (which would render it useless for broadband VLF signals, especially natural radio signals..).

Will keep you informed, when/where another VLF 'live spectrogram' goes online.

Cheers,
 Wolf .