2%. However for 390, a value of no greater than 1% is required for 90% certainty that the N  n/N probability of an unacceptable result is no greater than 2%. TABLE 4.5 Values of and for no more than 2% probability of N n an unacceptable result, with 90% certainty n/N p90 N n (%) (%) 292 1 0.52 2.0 397 4 1.01 2.0 776 10 1.29 2.0 1 900 30 1.58 2.0 10 000 181 1.81 2.0 50 000 960 1.92 2.0 ANNEX 1 CHAPTER 4 Side-lobe model from Recommendation ITU-R S.1428 The side-lobe gain model from Recommendation ITU-R S.1428, for antennas of diameter, greater than D, 100 wavelengths, , is as follows:  2.5  10–3 {D/λ}2 dBi for 0    m G() Gmax – for     r G() G1 φm 29 log() dBi for 10° G()  r    –25 34 30 log() dBi for 10 34.1 G()     –  dBi for 34.1    80 G() –12 dBi for 80 120     G() –7 dBi for 120 180     G() –12 where: 10 log{(D/λ)2} dBi Gmax  aperture efficiency for 0.7, 20 log{D/λ} 8.4 dBi :   Gmax     15 log{D/λ} dBi G1 –1 {20λ/D}(Gmax degrees m  G1)1/2 – 15.85 {D/λ}–0.6 degrees r 
2%. However for N  390, a value of n/N no greater than 1% is required for 90% certainty that the probability of an unacceptable result is no greater than 2%. TABLE 4.5 Values of N and n for no more than 2% probability of an unacceptable result, with 90% certainty N n n/N (%) p90 (%) 292 1 0.52 2.0 397 4 1.01 2.0 776 10 1.29 2.0 1 900 30 1.58 2.0 10 000 181 1.81 2.0 50 000 960 1.92 2.0 ANNEX 1 CHAPTER 4 Side-lobe model from Recommendation ITU-R S.1428 The side-lobe gain model from Recommendation ITU-R S.1428, for antennas of diameter, D, greater than 100 wavelengths, , is as follows: G()  Gmax – 2.5  10–3 {D/λ}2 dBi for 0    m G()  G1 for φm    r G()  29 –25 log() dBi for r    10° G()  34 – 30 log() dBi for 10    34.1 G()  –12 dBi for 34.1    80 G()  –7 dBi for 80    120 G()  –12 dBi for 120    180 where: Gmax  10 log{(D/λ)2} dBi : aperture efficiency for   0.7, Gmax  20 log{D/λ}  8.4 dBi G1  –1  15 log{D/λ} dBi m  {20λ/D}(Gmax – G1)1/2 degrees r  15.85 {D/λ}–0.6 degrees
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