8.4 Mixers 8.21* An AM signal is transmitted on an 800-kHz carrier. The baseband frequency range...
8.4 Mixers
8.21* An AM signal is transmitted on an 800-kHz carrier. The baseband frequency range extends from 100 Hz to 5 kHz. This signal is to be detected by a superheterodyne receiver with a 55-kHz intermediate frequency. (a) What is the frequency of the local oscillator? (b) What must be the Q of the IF stages if the 1-dB points are to correspond to the maximum and minimum frequencies of the IF signal?
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8.4 Mixers
8.21* An AM signal is transmitted on an 800-kHz carrier. The
baseband frequency range...
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.
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...
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.
The following is the channel frequency assignment for a 12-channel AM radio system: (c) Channel No Fcy 1240 kHz 1370 kHz 500 kHz 1630 kHz Channel No.Frequency 2280 kHz 2410 kHz 2540 kHz 2670 kHz Chan...
The following is the channel frequency assignment for a 12-channel AM radio system: (c) Channel No Fcy 1240 kHz 1370 kHz 500 kHz 1630 kHz Channel No.Frequency 2280 kHz 2410 kHz 2540 kHz 2670 kHz Channel No. Freqency 1760 kHz 1890 kHz 2020 kHz 2150 kHz 10 2 12 When the AM superheterodyne radio receiver is tuned to Channel 10, in addition to the signal carried on Channel 10, you can also hear a weak signal carried on Channel3 (i)...
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...
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.
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...
The following is the channel frequency assignment for a 12-channel AM radio system: (c) Channel No Fcy 1240 kHz 1370 kHz 500 kHz 1630 kHz Channel No.Frequency 2280 kHz 2410 kHz 2540 kHz 2670 kHz Channel No. Freqency 1760 kHz 1890 kHz 2020 kHz 2150 kHz 10 2 12 When the AM superheterodyne radio receiver is tuned to Channel 10, in addition to the signal carried on Channel 10, you can also hear a weak signal carried on Channel3 (i)...
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