VLF, A few days ago, Andrey / RD4HA from the RC4HAA club station has installed a GPS module for getting a better accuracy of a 47 uHz spectrogram. You can clearly see the improvement of the stability
VLF, There are more traces now at RC4HAA (http://136.su/grabber/) but still a bit weak to be convincing. Also the GPS reception is sometimes missed. Further improvement steps are needed... 73, Stefan