Colour Directional Spectrograms, received by DF6NM in Nürnberg, JN59NJ

Overview of LF Amateur-Band

135.7 - 137.8 kHz, 5 Hz/pix, 0.73 Hz FFT, 1 s scroll, update every 5 min

Transatlantic "Waterhole" and European Transmit Slot

Centered on 137.778 and 136.172 kHz, 22.9 mHz FFT, 10 s scroll

High-Resolution Spectrogram of Transatlantic Slot

137.777 kHz, 424 µHz FFT, 10 min scroll

Digimode Subband (WSPR, FST4W, Opera)

30.5 mHz FFT, 1 min scroll, decoders for FW30 (137.4 - 137.6 kHz) and WSPR-15 (137.6 - 137.625 kHz)

Opera Deep-Search Waterfall

137.45 - 137.55 kHz, 0.438 mHz FFT, 10 minute scroll

Opera Deep-Search Correlation Detections

Recent opds detections - Archive of earlier detections - Search list - DL0AO - IZ7SLZ - RN3AUS
EbNaut autodecoder results


   TA screenshots last 24h - Loran-C grabber - VLF grabber
   How this grabber started in 2004 - Daily LF-band archive
   Colour direction-finder description - DF6NM homepage
Thanks to DL4YHF for Spectrum Lab software.