Opera deep search users, here are some details on how to adapt opds to the new Op-2H mode for 29.5 kHz. If you are using an USB receiver, you could tune to 27.98 kHz dial and process the audio band a
Opds-2H monitoring on the bottom window of the opds page: http://dl.dropboxusercontent.com/u/26404526/opds.htm 424 µHz Spectrogram on the bottom of the VLF grabber: http://www.df6nm.de/vlf/vlfgrabber