the channel capacity for a telephone channel with a 4000-1Hz bandwidth and a ratio of 31? S An amplifier has an output of 10 mW. Express its output in dBm. 19. List two key factors that affect channel capacity? 20. Determine the height of an antenna for a TV station that must be able to reach customers up to 75 km away 21. Calculate the power at the receiver given the following information of a 2.4 GHz microwave system: 150 d8 Transmitter Power 20 dBm Transmitter antenna Gain 30 dB Receiver antenna Gain 30 dB Frees pace Loss Transmitter Cable and connector Loss Receiver Cable and connector Loss 4dB 4 dB 22. A digital signaling system is required to operate at 9600 bps. If a signal element encodes 2-bit word, what is the minimum required bandwidth of the channel as per Nyquist