Tropospheric propagation

Meteorologist William Hepburn's forecast maps often provide early indications of potential tropospheric DX (long distance) openings.

This example of 1,340-mile (2,160 km) tropospheric ducting reception shows Auckland, New Zealand 175.25 MHz ch4 TV received by Robert Copeman, Sydney, Australia.

Tropospheric propagation describes electromagnetic propagation in relation to the troposphere. The service area from a VHF or UHF radio transmitter extends to just beyond the optical horizon, at which point signals start to rapidly reduce in strength. Viewers living in such a "deep fringe" reception area will notice that during certain conditions, weak signals normally masked by noise increase in signal strength to allow quality reception. Such conditions are related to the current state of the troposphere.

单词	Tropospheric propagation
释义	Tropospheric propagation 英语百科 Tropospheric propagation Tropospheric propagation describes electromagnetic propagation in relation to the troposphere. The service area from a VHF or UHF radio transmitter extends to just beyond the optical horizon, at which point signals start to rapidly reduce in strength. Viewers living in such a "deep fringe" reception area will notice that during certain conditions, weak signals normally masked by noise increase in signal strength to allow quality reception. Such conditions are related to the current state of the troposphere.
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