138ms Periodicity Theory

• VE2AEJ/3 performed experiments in 1977-1979 recording many LDEs on 14, 21, and 28 MHz, made beaming west from Ottawa at band openings.

• The delays on LDEs recorded on 28 MHz show a periodicity of 138ms, the length of time required for a single circuit of the earth.

• Proposed a theory that the signal gets trapped in a duct, possibly between the E and F layers, only to be reflected back to the transmitting station off the ion trail of a meteor. Any Doppler shift would be small.