'SOUTHERN CALIFORNIA COASTAL PROPAGATION PHENOMENON'

摘要

During the Summer of 2001, W3NRG set up a PSK31 BEACONet station on 28.131 mh at his QTH in Coronado, California. Almost immediately, the station began to record the BEACONet signals of KF6XA whose Maidenhead locator code placed that station in Temecula, California. What made this reception interesting was that the distance between the two stations, 63 miles, is not characteristic of 10 meter ground wave propagation and there are at least three "mountains" in the path that obscure the simple line of sight. The BEACONet PSK31 signal protocol includes a preamble of approximately 30 characters folio wed by a "payload" consisting of station call letters, number of times per hour the beacon is being transmitted, a station configuration code, the Maidenhead locator and a cyclical redundancy check signature (CRC.) Stations are or have been active in various parts of the United States and in Europe and Australia. The recommended transmission timing is between six and twelve times per hour. Software is available to record the reception of signals which pass the cyclical redundancy test and, in certain cases, even send reports over the internet automatically at menu selectable times.