IFT 372 WIRELESS COMMUNICATION - HELM - QUIZ 1-7 + MIDTERM + LECTURE ACTIVITIES

What is a logarithm? - Answer-A logarithm is an exponent based mathematical representation of a numerical value. What logarithmic base is used in digital communications? - Answer-Two How do you find a log2 value on a calculator that only has log10 functionality? (Hint: what is the formula?) - Answer-log2(a) = [log10(a) / log10(2)] What is the definition of a decibel? - Answer-A decibel is a mathematical representation of a power level on a logarithmic scale. a = 10lob(b), where a is the decibel value and b is the decimal value. You cannot mix decimal and decibel values in an equation (i.e., you either have to work with decimal values or decibel values) - Answer-True There can be more than one power value in a decibel (dB) equation. - Answer-False When you add two decibel values, you are multiplying those values in decimal (I.e. 3 dB + 6 dB = 9 dB which is equivalent to 2 * 4 = 8 in decimal) - Answer-True __________ is a decibel value referenced to watts and ______ is a decibel value referenced to milliwatts. - Answer-dBW & dBm How do you convert dBW to dBm? - Answer-Add 30 dB to dBW to obtain dBm value The net gain or (loss) of a transmission system is a radio between the _________ __________ and ____________ ____________ where the ___________ is the numerator and the ___________ ____________ is the denominator. - Answer-Output power & Input power What parameter of the intelligent signal causes or determines the instantaneous rate of carrier frequency? - Answer-Amplitude of the modulating signal What parameter of the intelligent signal causes frequency deviation of the carrier? - Answer-Amplitude of the modulating signal A modulated carrier occupies a single frequency. - Answer-False Determine the noise power (in dBm) at 27° C in a 500 kHz bandwidth. - Answer-PN = 1