Case (b) is also divided into two parts, b2 and b4, which also designate a two- and four-section filter, respectively. However, it is expected that improvement in filter design will enable us to reasonably achieve a half 3 dB width of 50 MHz from the fundamental. This will follow the law of -6 dB per octave (of 50 MHz) per section. Figure 79 shows the straight-line approximation to the performance of these filters. Again the improvement in Amplitron design is reflected in the curves. The total effective filtering between the antenna and the generator in dBw/MHz is given in Figure 78 and 79 for each of the respective cases, a2, a4, b2, and b4. d. Noise Power The system shown in Figure 80 shows the noise power generated in dBw/m2 at some distance R from the transmitting antenna which is given by, where For most considerations, will remain the same at 98 dBw and, since the transmitting system is in stationary orbit, the distance R will remain constant, and the equation for P dBw/m2 becomes:
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