Here are a few tips and pointers that might help in identifying and hunting for LP openings.ġ) If you find a weak signal on SP and then turn your antenna beam in the opposite direction (180° away) and now if you find that the signal from the DX is stronger, then surely it is LP.Ģ) LP would usually manifest better to a DX destination with SP distance that is more than 6000-7000 Km away.
Therefore in this post, let me provide a few brief pointers related to the exciting world of working DX via the Long Path. We cover the concepts of both SP and LP along with a lot of other information in the article Geodesic for Terrestrial HF Radio. Communication with another station located at the Antipode throws up a very unique propagation effect… Let us ignore the Antipode case for the time being and see what happens when we try to reach a DX station via the usual SP or via LP by turning our antenna beams towards LP by swinging the beam 180° around. This point on earth is called the Antipode. It is when the DX station is located at a point that is equidistant along both the SP and the LP. The direction along the shorter of the two distances is called the Short Path heading, while that in the opposite direction is the Long Path heading. In one direction along the circular path (Great Circle), the distance is shorter than the distance along the opposite direction. The Great Circle round-the-world path is always unique between any two radio stations on earth. However, this straight path if extended beyond the DX location eventually circles the globe and reaches back to the originating TX station’s location. The earth is nearly a spherical object and the path taken by the radio signals to travel to the DX location is always via the shortest straight path along the spherical surface of the globe. By and large, on a routine basis, we all tend to explore HF radio propagation openings that prevail along the better known Short-Path (SP). HF radio DXing may often be leveraged by the use of HF Long Path (LP) from time to time.
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