Problem 1: In a broadcasting communication system, the transmitter power P, is so KW, the channel attenuation is 80 dB (the attenuation in dB between P; and the received signal power Pais computed as 10lo9,0(Pr/Pa)), and the noise power spectral density is 10-11 WHz. The message signal has a bandwidth W = 100KH. I) Find the prodetection signal-to-noise ratio for the cases when the modulations are DSB-SC, DSB-LC and SSB, respectively. 2) Find the output signal-to-noise ratio (), if the modulation is DSB. 3) Find the output signal-to-noise ratio (). if the modulation is SSB. 4) Find the output signal-to-noise ratio E), if the modulation is DSB-LC (assume coherent detector is used in demodulation) with a modulation index 0.8

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.