HAARP Moon Echo Experiment--Slight Return

On the second night of the experiment, January 20, 2008, I copied signals at 6.7925 MHz from 0130 until 0139 EST, at which time the signals abruptly stopped and I subsequently received nothing. (nothing audible and nothing on the spectrum readout, which is much more sensitive.) I monitored continuously for another 15 minutes and then spot checked until 0230 EST. I moved to 7.4075 MHz and also copied nothing there.

HAARP Moon Echo Experiment

Tonight, the HAARP transmitter in Alaska was used to direct exceedingly powerful radio pulses (around 4 Gigawatts effective radiated power) at the moon at a frequency of 6.7925 MHz and I could easily receive the echoes from the two second bursts here on earth with my amateur radio rig.

Waterfall spectrogram of radio echoes from the moon.
Click on the photo, then on "all sizes" for a larger image.