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Extra info for AN 08-10-94 SCR-578-A,B Radio Transmitter (maint.) (Mil TM)

Sample text

The Antigua experiments described in the preceding chapter reveal the existence of a type of low duct which seems to be characteristic of maritime air. It appears probable that similar ducts are permanent in the oceanic regions of many parts of th^ earth. The relative humidity of the air at Antigua was found to be 60 to 80 per cent, indicating that a continuous upward diffusion of moisture must take place, since the air immediately adjacent to the water surface is always practically saturated. On the other hand, there is little difference between the air and sea tempera­ tures in this case, the ocean being about 25 C while the air temperature varies between 23 and 26 C.

With a substandard Μ curve the electromagnetic field near the earth surface is diminished instead of increased, a case opposite to that of superrefraction. In practice this weakening of the field not uncom­ monly leads to a more or less complete radio blackout. Fog, however, does not always produce a sub­ standard Μ curve although that is usually the case. In certain less frequent types of fog, the temperature and saturation vapor pressure may be constant or 41 equilibrium between the air and the water surface will again be reached.

The first measure­ ments were made in 1942, and experiments on a very large scale were carried out in 1944. ^' ιο· i " . i s a χ^^. optical transmission paths were operated in 1943, a 22-mile path over the sea and a 45-mile path over land. A 10-cm continuous signal was used, and the strength was monitored by means of thermistors. The antennas were dipoles with 30-in. parabolic reflec­ tors. The received signal was automatically recorded on meters having a range of 60 db. The signals received were correlated with meteorological observa­ tions, the results of which will be given below.

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