The author is a consultant in Carterton, New Zealand. This follows up his December article “Tuned Bandpass Filter Is Solution to Backup STL.” Many years ago, the active whip antenna and the active ...
IT is well known that medium-frequency radio waves (0.5–1.5 Mc./s.) are often very highly absorbed in their passage through the lower ionosphere, so that the amplitude of the echo may fall below the ...
MEDIUM frequency radio waves are vertically back-scattered from regions of the ionosphere below the E-layer. Results in ref. 1 show that scattering occurs chiefly in two definite regions, one at a ...
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