§73.190. Engineering charts and related formulas.
47 C.F.R. § 73.190
This section consists of the following Figures— 2, r3, 5, 6a, 7, 8, 9, 10, 11, 12, and 13. Additionally, formulas that are directly related to graphs are included.
Formula 1 is used for calculation of 50% skywave field strength values.
Formula 2 is used for calculation of 10% skywave field strength values.
Figure 6a depicts angles of departure versus transmission range. These angles may also be computed using the following formulas:
In the event of disagreement between computed values using the formulas shown above and values obtained directly from the figures, the computed values will control.
Notes, amendments, and revision history
Amendments
[28 FR 13574, Dec. 14, 1963, as amended at 30 FR 12720, Oct. 6, 1965; 33 FR 15420, Oct. 17, 1968; 48 FR 42959, Sept. 20, 1983; 49 FR 43963, Nov. 1, 1984; 50 FR 18844, May 2, 1985; 51 FR 4753, Feb. 7, 1986; 52 FR 36879, Oct. 1, 1987; 56 FR 64869, Dec. 12, 1991]
Authority
Authority: 47 U.S.C. 154, 155, 301, 303, 307, 309, 310, 334, 336, 339.
Amendments
[28 FR 13574, Dec. 14, 1963, as amended at 30 FR 12720, Oct. 6, 1965; 33 FR 15420, Oct. 17, 1968; 48 FR 42959, Sept. 20, 1983; 49 FR 43963, Nov. 1, 1984; 50 FR 18844, May 2, 1985; 51 FR 4753, Feb. 7, 1986; 52 FR 36879, Oct. 1, 1987; 56 FR 64869, Dec. 12, 1991]