Radio propagation models are empirical in nature, which means, they are developed based on large collections of data collected for the specific scenario.
32.
The riometer was developed in the mid 1950s by scientists at the University of Alaska who were researching the radio propagation effects of aurorae.
33.
Radio propagation is affected by the daily changes of water vapor in the troposphere and ionization in the upper atmosphere influenced by the Sun.
34.
Here they have also been used to represent the radio propagation element of practical systems providing high frequency communication, direction finding and over-the-horizon radar.
35.
Maurice V . Wilkes and J . A . Ratcliffe researched the topic of radio propagation of very long radio waves in the ionosphere.
36.
Manotick was host to a Royal Canadian Navy ( RCN ) experimental ionospheric laboratory often referred to as the RPL, or the Radio Propagation Laboratory.
37.
Being lower in frequency than the other radio bands already in use, it has better radio propagation characteristics due to the physics of longer wavelengths.
38.
During appropriated periods of radio propagation, the signals can reach other countries, as well the reception can turn difficult in dense populated areas due Electromagnetic interference.
39.
The Chelsea station operated during the post war period but in 1947, its work was transferred to the Defence Research Board's new Radio Propagation Laboratory in Ottawa.
40.
"We just completed a test with Verizon in Manhattan, which is probably the worst place for radio propagation in the country, " said TruePosition spokesman Michael Amarosa.
