RG-19/U is used at 100 Mhz with an input power of 10 mW. The combined system losses add up to 50 dB. If RG-19/U has an attenuation of 22.6 dB/km. (a) Compute the sensitivity of the receiver and the maximum length of the communication link. (b) What is length required if fiber with 4 dB/km replaces the coaxial cable. (c) Determine the number of photons per second that the receiver received if the carriers operate at wavelength of 1500 nm. ctor is 0.80. What is the optical modulation factor in this circuit at the 3-dB frequency (f3-dB)?