My Primary Radio Interest
Extreme long range VHF and UHF communications is my primary interest in Amateur Radio. Specifically, I am focusing on tropospheric ducting paths exceeding 3,000km. A large percentage of my web page focuses on this aspect of the hobby.
Overview
Tropospheric ducting spanning long trans-oceanic paths has not been fully explored. Several regions are already well proven. Some of these have been worked for more than 5 decades, while others are more recently “discovered”. These established paths are:
Other trans-oceanic ducts have long been suspected. Occasional reports of DX reception over very long oceanic paths have been reported over several paths. Probably the main reason these paths have not been worked yet is the lack of operators interested in and equipped to work these paths in the optimum locations. Some of the paths yet to be worked include:
Propagation Mechanism
The primary propagation mechanism for trans-oceanic ducting is the subsidence temperature inversion. There is a lot of detail available on the Internet on this propagation mode, and will not be repeated here. The reader is encouraged to review the following articles on the web.
Additional Data Sources