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+// chapter 7 example 9
+//-----------------------------------------------------------------------------
+clc;
+clear;
+// given data
+Beam_w_3db  = 0.4;
+
+// Calculations
+N2N_Beam_w  = 2*Beam_w_3db; // Null to Null beamwidth
+
+// output
+mprintf('Null to Null Beam width = %3.1f degrees',N2N_Beam_w);
+//------------------------------------------------------------------------------