Mixed path Sample Clauses

Mixed path. 2.2.1 The curves in Figures 1 to 9 may be used for the determination of propagation over mixed paths (inhomogeneous smooth earth) as follows. Such paths may be made up of sections S1, S2, S3, etc. of lengths d1, d2, d3, etc. having conductivity and dielectric constant σ1, ε1; σ2, ε2; σ3, ε3 etc. shown below for three sections: S1(σ1, ε1) S2(σ2, ε2) S3(σ3, ε3) <–––––––– d1 ––––––––> <–––––––– d2 ––––––––> <–––––––– d3 ––––––––> T R There are various semi-empirical methods of determining the propagation over such paths, of which that due to Xxxxxxxxxx (1949) is the most accurate and has been made to satisfy the reciprocity condition. The method assumes that curves are available for the different types of terrain in the sections S1, S2, S3 etc. assumed to be individually homogeneous, all drawn for the same source T defined, for instance, by a given inverse-distance curve. The values may then finally be scaled up for any other source. For a given frequency, the curve appropriate to the section S1, is chosen and the field E1 (d1) in dB (l μV/m) at the distance d1 is then noted. The curve for the section S2 is then used to find the fields E2 (d1) and E2 (d1 + d2) and, similarly, with the curve for the section S3, the fields E3 (d1 + d2) and E3 (d1 + d2 + d3) are found, and so on. A received field strength ER is then defined by ER = E1 (d1) – E2 (d1) + E2 (d1 + d2) – E3 (d1 + d2) + E3 (d1 + d2 + d3) given by The procedure is then reversed, and by calling R the transmitter and T the receiver, a field ET is obtained, ET = E3 (d3) – E2 (d3) + E2 (d3 + d2) – E1 (d3 + d2) + E1 (d3 + d2 + d1) The required field is given by ½ (ER + ET), the extension to more sections being obvious. Annex 2 – 26 – – 27 – Annex 2 Annex 2 – 28 – – 29 – Annex 2 Annex 2 – 30 – – 31 – Annex 2 Annex 2 – 32 – – 33 – Annex 2 Annex 2 – 34 – – 35 – Annex 2 CHAPTER 3 Sky-Wave Propagation
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