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- Question : 1P - FM Booster An FM radio booster has a power gain of 10 dB. What is the voltage gain?
- Question : 2P - Mismatched Amplifier An amplifier has an input and output impedance of 50 . When measured in a 50 system, the amplifier exhibits a power gain of 15 dB. If the amplifier is connected into a 30 system, what is the power gain?
- Question : 3P - Cascaded Amplifiers Three cascaded amplifier have power gains of 10, 15, and 20 dB. What is the overall power gain? What is the overall voltage gain?
- Question : 4P - dBm Conversions a. Convert 2 watts into dBm. b. What is the voltage of this 2 watt signal in a 600 telephone line
- Question : 5P - Splitter A four-set TV splitter advertises a loss of 5 dB per output. Can this specification be true?
- Question : 6P - Filter Slope Filter slope characteristics and control system Bode plots are often given as 6 dB per octave or 20 dB per decade, referring to the slope of the amplitude curve versus frequency. Show that these slopes are equivalent.
- Question : 7P - Signal-to-Noise Ratio A geostationary satellite has an output power of 10 watts into its transmitting antenna. The satellite antenna has a gain of 6 dB. The path loss between the transmitting and receiving antenna is 200 dB. The ground station receive antenna has a gain of 40 dB. The received noise is 2 dBf. What is the received signal-to-noise ratio (SNR)?
- Question : 8P - Amplifier Ripple A 25 Watt stereo amplifier is advertised as
- Question : 9P - FM Receiver Gain An FM radio receiver can deliver 50 watts of sound to the speakers with an input signal of 10 dBf. What is the overall power gain in dB?
- Question : 10P - Cable Loss A coaxial cable has a loss of 3 dB per 100 feet. What is the power loss of 500 feet of cable?
- Question : 11P - Noise Reduction The Dolby tape-noise reduction system reduces tape hiss by 15 dB. How much is the noise voltage reduced in linear terms?
- Question : 12P - Cable Diameter What change in the quantity D/d will cause the characteristic impedance of a coaxial cable to change from 50 to 55 ?
- Question : 13P - Channel Separation A stereo amplifier has a channel separation of 30 dB. How much of the left channel signal voltage appears in the right channel?
- Question : 14P - Input and Output Impedances An RF amplifier has a maximum input voltage standing wave ratio (VSWR) specification of 2.5. a. What is the corresponding range in input reflection coefficient? b. What are the minimum and maximum terminal impedances of this amplifier?
- Question : 15P - Manual Cascade Calculations For the cascade shown in Figure 1-39, calculate a. The gain of each component in linear terms b. The cascade gain using the component gains expressed in dB c. The power present at the output of each component, in dBm, if the input power is ?80 dBm
- Question : 16P - Manual Cascade Calculation with Mismatch Given the cascade shown in Figure 1-40: a. Find the cascade gain assuming the mismatch loss of every component is zero (i.e., each component is perfectly matched to 50 ). b. If each component has a maximum input VSWR of 2.0, what are the minimum and maximum reflection coefficients present on the input port of each device? What are the allowable angles of the reflection coefficient? c. If each component has a maximum output VSWR of 1.5, what are the minimum and maximum output impedances present on the output port of each device? What are the allowable angles of the reflection coefficient? d. What is the maximum possible input mismatch loss of each component? What is the maximum possible output mismatch loss of each component? e. What is the minimum and maximum gain of the cascade if each component has a maximum input VSWR specification of 2.0 and a maximum output VSWR specification of 1.5? f. Describe, in words, the condition in which the gain variation varies the most from its nominal or matched value.
- Question : 17P - Manual Cascade Calculation For the cascade of Figure 1-41: a. Find the power gain of each component in linear terms. b. Find the cascade gain using dB. c. Find the cascade gain using the linear numbers. d. Find the output power if the input power is 27 dBf. Answer in mW and dBm.
- Question : 18P - Amplifier Modeling and Mismatching Find the signal power delivered to the load resistor for the amplifier of Figure 1-42 when a. Ramp,in = Ramp,out = 50 . b. Ramp,in = 40 and Ramp,out = 60 .
- Question : 19P - Essay: Why 50 ? Find the impedances most commonly used in the following industries:
- Question : 20P - Multiple Choice: Decibels The reason we commonly use decibels (or dBs) in radio calculations is: a. The quantities in radio frequency systems exhibit a large range and expressing the quantities logarithmically is more convenient. b. It
- Question : 21P - Multiple Choice: Impedance Matching Which statement regarding impedance matching is false? a. Impedance matching makes calculations easier. b. We match for maximum power transfer. c. We match to suppress reflections on transmission lines. d. We can use selective matching to remove unwanted signals. e. We must match only at the very input of a receiver, before the first amplifier.
- Question : 22P - Units of Power and Decibels a. Convert the following power measurements to watts: 27 dBm, 30 dBW. b. Convert the following power measurements to dBm: 20 mW, 500 W, 10 nW. c. Convert 17 dBV to volts. d. Convert 63 dBHz into hertz. We often use this notation for noise calculations. e. If the alternate current (AC) current gain of a bipolar transistor is 40, to how many dB does this correspond? f. Assume for the following that AC power is being dissipated in a 50 load.

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