INTROCOMMS & NOISE(COACHING).docx - CNS\u2013ST 1.1 INTRO TO COMMS NOISE AND dB MEASURMENTS 1 The theory of radio waves was originated by Ans Maxwell 2

INTROCOMMS & NOISE(COACHING).docx - CNSu2013ST 1.1 INTRO...

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CNS–ST 1.1: INTRO TO COMMS, NOISE AND dB MEASURMENTS 1.The theory of radio waves was originated by: 2.The first person who sent the first radio signal across the Atlantic ocean: 3.The transmission of radio waves was first done by: 4.When two or more signals share a common channel, it is called: 5.“Man-made” noise can come from: 6.Thermal noise is generated in: 7.Shot noise is generated in: 8.The power density of “flicker” noise is: 9.So called “1/f” noise is also called: 10.“Pink” noise has: 11.Noise figure is a measure of: 12.Resistor that generates the lowest thermal noise: 13.Resistor with typical voltage range of 14.Reference for noise temperature in ˚C: 15.Standard test tone connected on audio equipment? 16.Reference standard test tone normally used is indicated in: 17.Power lost in device, due by the path of energy flow. 18.The noise generated with semiconductor devices. Ans. shot noise *19.Bandwidth is approximately _____ the highest baseband frequency. Ans. 2 times * 20.Flicker noise in radio communications is also known as. 21.What determines the BW of a transmitted signal? 22.What formula is used to calculate the overall noise performance of the receiver or of multiple stages if RF amplification?
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23.If the bandwidth is doubled, considering all other parameters unchanged except the normal thermal noise only. The S/N will be___ 24.Noise at the receiver is in terms of: 25.Reference tone level for µBa: 26.Reference tone level for dBrn: 27.Reference tone level for F1A: 28.Reliable measurement for comparing amplifier noise characteristics: 29.A receiver has noise power bandwidth of 10 kHz. A resistor that matches thereceiver input impedance is connected across its antenna terminals. What isthe noise power contributed by that resistor in the receiver bandwidth if the resistor has a temperature of 27 degrees Celsius? W
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