Long-distance propagation effects in the HF signals from different heating facilities observed with using passive Doppler sounding equipment at Irkutsk

We present the first observation results of long-distance propagation effects of short radio waves at pump frequency, observed by passive Doppler sounding equipment at Irkutsk during heating facilities operation. We demonstrate two effects: dependence of the received signal amplitude on the propagation path during power-stepping mode and difference between experimental observations and propagation expectations according to our model.