Question

Ship Tx Antenna Air (8,4) 3. (35 points) The receiver antenna of a submarine requires a minimum power level P, = 0 [dBmW] for detection. Calculate the minimum power level of transmission Pe [dBmW] (30p) and P, [W] (5p) for the isotropic antenna of a ship located on the sea surface to communicate with the submarine at a depth of d = 65 [m] at f = 1 [kHz). P[W] Hint: P (dBmW] = 10 log10 I Sea (8 = 818,4 = 4 o=4 S/m Rx Antenna Submarine Figure 2

Answer 1

Gilen Pozo dBmk, de 65m, f = 1kH2 2 lxlo - 3 Given isotropic antenna. isotopic antenna Rain G=1 Pra PEG Gr 3x100 tola 1x 103 3 300 x 10 PtXIX 1x10 -3 14T X 65 300 x 103 Pt 7. & 1 xlo ม Pe [de] a - 81.3dB Pe [dBm] .81.30 dB - 30dB Pe [dBm] =-111.30 dBm