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 other carrier frequency. If the receiver RF stage
bandpass filter has poor selectivity what is the frequency of the
interfering signal?
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Consider a superheterodyne receiver designed to receive the
frequency band 1 to 30 MHz with IF...
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 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...
71. A superheterodyne receiver tunes at the frequency range from 25 to 50 MHz. What is the IF frequency of the rece...
71. A superheterodyne receiver tunes at the frequency range from 25 to 50 MHz. What is the IF frequency of the receiver if the range of the local oscillator is 10 MHz to 35MHz 75. An AM transmitter uses high-level modulation. The RF power amplifier draws 12 A from 22 V supply putting out a carrier power of 140 Watts. What impedance would be seen at the modulation transformer secondary? 72. A receiver has a sensitivity of 0Suv and blocking...
Question 5 superheterodyne receiver that The commercial FM broadcasting radio uses a has the following specifications:...
Question 5 superheterodyne receiver that The commercial FM broadcasting radio uses a has the following specifications: IF Filter Frequency: 10.7 MHz FM Radio transmitter carrier frequency range: 87.5 MHz to 108 MHz (a) Determine the local oscillator frequency range if low-side tuning is used. (b) Determine the local oscillator frequency range if high-side tuning is used (c) Determine the range of the image frequencies associated with a high-side tunning local oscillator
Question 5 superheterodyne receiver that The commercial FM broadcasting...
A transmitter transmits an AM signal with a carrier frequency of 1305 kHz. When an inexpensive...
A transmitter transmits an AM signal with a carrier frequency of 1305 kHz. When an inexpensive radio receiver (which has poor selectivity in the RF-stage bandpass filter) is tuned to 1305 kHz the signal is heard loud and clear. The same signal is also heard (not so loud) at another setting. At what frequencies except 1305 KHz you will hear this station. The IF frequency is 455 kHz.
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...
3. In a shortwave AM superheterodyne radio, the IF amplifier is centered at 455 kHz. The...
3. In a shortwave AM superheterodyne radio, the IF amplifier is centered at 455 kHz. The receiver is designed to receive shortwave transmissions with carrier frequencies between 9.4 and 9.9 MHz. Determine the frequency range of the local oscillator for this receiver. Assume the local oscillator frequency is higher than the carrier frequency.
The following figure represents a superheterodyne receiver. Your target is to receive signals from a station...
The following figure represents a superheterodyne receiver. Your target is to receive signals from a station which operates at 175 MHz. Find the image frequencies for your desired signals. Show your step by step calculation. Discuss the significance of image frequencies in communication systems. V Antenna RF amplifier First IF amplifier (30 MHz) Second IF amplifier (10 MHz) Detector and amplifier Output First local oscillator Second local oscillator COSW, او لما C05
Q2. (a) Determine the Fourier transform of a Hann (sometimes called a raised cosine) window function...
Q2. (a) Determine the Fourier transform of a Hann (sometimes called a raised cosine) window function h(t) of width T, defined + cos 2 0 (b) Sketch the form of a sinusoidal waveform of frequency vo as observed on a spectrum 4] analyser with the Hann window function enabled. Assume voT> 1. Q3. A television receiver uses the superheterodyne detection system to translate signals to an intermediate frequency of 44 MHz. Terrestial digital television broadcasts in the U.K. since 2012...
4. A superheterodyne radio receiv er is required to cover the VHF frequency band from 70-85...
4. A superheterodyne radio receiv er is required to cover the VHF frequency band from 70-85 MHz, using an intermediate frequency (IF) of 10.7 MHz. a) Find the frequny range needed fromthe local oscillator. b) Determine whether all image frequencies will be outside the operating frequency band.
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...
71. A superheterodyne receiver tunes at the frequency range from 25 to 50 MHz. What is the IF frequency of the receiver if the range of the local oscillator is 10 MHz to 35MHz 75. An AM transmitter uses high-level modulation. The RF power amplifier draws 12 A from 22 V supply putting out a carrier power of 140 Watts. What impedance would be seen at the modulation transformer secondary? 72. A receiver has a sensitivity of 0Suv and blocking...
Question 5 superheterodyne receiver that The commercial FM broadcasting radio uses a has the following specifications: IF Filter Frequency: 10.7 MHz FM Radio transmitter carrier frequency range: 87.5 MHz to 108 MHz (a) Determine the local oscillator frequency range if low-side tuning is used. (b) Determine the local oscillator frequency range if high-side tuning is used (c) Determine the range of the image frequencies associated with a high-side tunning local oscillator
Question 5 superheterodyne receiver that The commercial FM broadcasting...
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. In a shortwave AM superheterodyne radio, the IF amplifier is centered at 455 kHz. The receiver is designed to receive shortwave transmissions with carrier frequencies between 9.4 and 9.9 MHz. Determine the frequency range of the local oscillator for this receiver. Assume the local oscillator frequency is higher than the carrier frequency.
The following figure represents a superheterodyne receiver. Your target is to receive signals from a station which operates at 175 MHz. Find the image frequencies for your desired signals. Show your step by step calculation. Discuss the significance of image frequencies in communication systems. V Antenna RF amplifier First IF amplifier (30 MHz) Second IF amplifier (10 MHz) Detector and amplifier Output First local oscillator Second local oscillator COSW, او لما C05
Q2. (a) Determine the Fourier transform of a Hann (sometimes called a raised cosine) window function h(t) of width T, defined + cos 2 0 (b) Sketch the form of a sinusoidal waveform of frequency vo as observed on a spectrum 4] analyser with the Hann window function enabled. Assume voT> 1. Q3. A television receiver uses the superheterodyne detection system to translate signals to an intermediate frequency of 44 MHz. Terrestial digital television broadcasts in the U.K. since 2012...
4. A superheterodyne radio receiv er is required to cover the VHF frequency band from 70-85 MHz, using an intermediate frequency (IF) of 10.7 MHz. a) Find the frequny range needed fromthe local oscillator. b) Determine whether all image frequencies will be outside the operating frequency band.
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