Homework Answers
At design level there are two choices for the local oscillator frequency:
fLO=fRF+fIFfLO=fRF+fIF (high-side injection) or fLO=fRF−fIFfLO=fRF−fIF (low-side injection)
Usually for medium wave AM receivers and FM receivers the frequency of the oscillator is higher than the desired RF frequency (fLO=fRF+fIFfLO=fRF+fIF). Since the oscillator is implemented with a fixed inductor and a variable capacitor, with this choice the capacitor change is well within the realm of possibility.
A low-frequency oscillator (LFO) is an electronic oscillator that generates a frequency below approximately 20 Hz. This term is typically used in the field of audio synthesizers, to distinguish it from an audio frequency oscillator. An audio oscillator produces frequencies in the audio range about 16 hz to 20 hz
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a. What frequency is the pre-selector tuned to? b. What frequency is the local oscillator tuned...
Problem5: A superheterodyne receiver is tuned to a station at 20 MHz. The local oscillator frequency is 80 MHz and the IF is 100 MHz. a) What is the image frequency fimage? b) The RF amplifier (i.e....
Problem5: A superheterodyne receiver is tuned to a station at 20 MHz. The local oscillator frequency is 80 MHz and the IF is 100 MHz. a) What is the image frequency fimage? b) The RF amplifier (i.e. image rejection BPF) has the following frequency response: and is tuned to 20MHz (ie. 20MHz). Let R = 10 and Q-50: i. Compute the filter magnitude response H()I at both f- 20MHz and f fimage i. Compute the image attenuation ratio in dB...
1) in a fit of physics rebellion, you throw an oscillator tuned to a frequency of...
1) in a fit of physics rebellion, you throw an oscillator tuned to a frequency of 50 hz straight upward from a tall building. how does the frequency you hear change with time as the oscillator return to you. a) The frequency will be lower than 50 Hz but does not change with time. b) The frequency will be higher than 50 Hz but does not change with time. c) The frequency will be lower than 50 Hz and decrease...
19. What is the resonant frequency of a series-tuned LC circuit that contains a 2 mH...
19. What is the resonant frequency of a series-tuned LC circuit that contains a 2 mH inductor and a 30 μF capacitor? (Round your answer to the nearest Hz.) A. 278 Hz B. 550 Hz C. 420 Hz D. 650 Hz 21. How is the proper phase shift produced in a phase-shift oscillator? A. Through a transistor B. Through RC combinations C. Through an inductor D. Through RL combinations 22. An RC phase-shift oscillator has a load resistance...
3. A satellite communication receiver is designed to receive a transmission at 136.5 MHz. The receiver...
3. A satellite communication receiver is designed to receive a transmission at 136.5 MHz. The receiver uses two heterodyne operations (dual-conversion receiver) with intermediate frequencies of 25 MHz Texas A&M University-Kingsville, Electrical Engineering and Computer Science Department & 12 MHz, as shown below. The first local oscillator is designed to operate above the incoming carrier frequency, and the second local oscillator is to operate below the first intermediate frequency Mixer # 1 Mixer #2 Output RF X Filter & IF,...
A stroboscope was used to determine the frequency of the string oscillator. Strobe frequencies fs were...
A stroboscope was used to determine the frequency of the string oscillator. Strobe frequencies fs were recorded where a single stationary image of the oscillating string was observed. The frequency of the oscillator f can be determined from the stroboscope frequencies fs by f = nfs where n is an integer corresponding to the number of oscillations per flash. The strobe frequencies produced were determined and tabled below: Strobe Frequency fs Hz Oscillations per flash n 22.2 m 14.4 m+1...
What range of frequencies should the local oscillator be able to provide to mix the FM...
What range of frequencies should the local oscillator be able to provide to mix the FM radio range (87 to 102 MHz) down to 10 MHz?
A communication system uses a superheterodyne receiver containing two mixers. The intermediate frequencies are 10.7 MHz...
A communication system uses a superheterodyne receiver containing two mixers. The intermediate frequencies are 10.7 MHz and 470 kHz. The desired signal has a carrier frequency of 102.3 MHz. (a) What are the two local oscillator frequencies in the receiver (both mixers are superheterodyne)? (3 marks) (b) Explain what an image frequency is. (2 marks) (c) How many image frequencies are there in this communication system? Calculate their frequencies. (5 marks) (d) Explain how this receiver removes each of the...
(a) What is the frequency of RTC oscillator and frequency of main oscillator in a Beaglebone...
(a) What is the frequency of RTC oscillator and frequency of main oscillator in a Beaglebone Black? (a) DMTimer in Beaglebone black has capture and compare channels. How many capture channels does it have and how many compare channels does it have?
02. If you have a number of radio stations send their own programs at different carrier...
02. If you have a number of radio stations send their own programs at different carrier frequencies, all simultaneously. For instance, a radio receiver is tuned to receive AM modulated wave sent at carrier frequency of frR 980 kHz. the receiver LO is set at fio- 1435 kHz. For the given data: 1. Calculate frequencies at the receiver's mixer output. 2. Which frequency should be chosen as the intermediate frequency (IF)? 3. At what frequency the image radio station would...
Consider a superheterodyne receiver designed to receive the frequency band 1 to 30 MHz with IF...
Consider a superheterodyne receiver designed to receive the frequency band 1 to 30 MHz with IF frequency 10 MHz. The local oscillator generates frequencies such that the ratio between the maximum and the minimum generated frequency is the smallest. a) What is the range of frequencies generated by local oscillator for this receiver? b) An incoming signal with carrier frequency 6 MHz is received at 6 MHz setting. At this setting we also get interference from a signal with some...
Problem5: A superheterodyne receiver is tuned to a station at 20 MHz. The local oscillator frequency is 80 MHz and the IF is 100 MHz. a) What is the image frequency fimage? b) The RF amplifier (i.e. image rejection BPF) has the following frequency response: and is tuned to 20MHz (ie. 20MHz). Let R = 10 and Q-50: i. Compute the filter magnitude response H()I at both f- 20MHz and f fimage i. Compute the image attenuation ratio in dB...
3. A satellite communication receiver is designed to receive a transmission at 136.5 MHz. The receiver uses two heterodyne operations (dual-conversion receiver) with intermediate frequencies of 25 MHz Texas A&M University-Kingsville, Electrical Engineering and Computer Science Department & 12 MHz, as shown below. The first local oscillator is designed to operate above the incoming carrier frequency, and the second local oscillator is to operate below the first intermediate frequency Mixer # 1 Mixer #2 Output RF X Filter & IF,...
A communication system uses a superheterodyne receiver containing two mixers. The intermediate frequencies are 10.7 MHz and 470 kHz. The desired signal has a carrier frequency of 102.3 MHz. (a) What are the two local oscillator frequencies in the receiver (both mixers are superheterodyne)? (3 marks) (b) Explain what an image frequency is. (2 marks) (c) How many image frequencies are there in this communication system? Calculate their frequencies. (5 marks) (d) Explain how this receiver removes each of the...
(a) What is the frequency of RTC oscillator and frequency of main oscillator in a Beaglebone Black? (a) DMTimer in Beaglebone black has capture and compare channels. How many capture channels does it have and how many compare channels does it have?
02. If you have a number of radio stations send their own programs at different carrier frequencies, all simultaneously. For instance, a radio receiver is tuned to receive AM modulated wave sent at carrier frequency of frR 980 kHz. the receiver LO is set at fio- 1435 kHz. For the given data: 1. Calculate frequencies at the receiver's mixer output. 2. Which frequency should be chosen as the intermediate frequency (IF)? 3. At what frequency the image radio station would...
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