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71. A superheterodyne receiver tunes at the frequency range from 25 to 50 MHz. What is the IF frequency of the rece...
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...
An AM receiver is tuned to broadcast station at 600 kHz. Calculate the image rejection in dB, assuming that the input filter consist of one tuned circuit with a Q of 40? An SSB system transmit a peak envelope power of 100 W into a 75 ohms load. The carrier signal is modulated by two tones, with frequencies 2 kHz and 3 kHz with equal magnitude and only the lower sideband is transmitted with a suppressed carrier. Determine the average...
An AM receiver is tuned to broadcast station at 600 kHz. Calculate the image rejection in dB, assuming that the input filter consist of one tuned circuit with a Q of 40? An SSB system transmit a peak envelope power of 100 W into a 75 ohms load. The carrier signal is modulated by two tones, with frequencies 2 kHz and 3 kHz with equal magnitude and only the lower sideband is transmitted with a suppressed carrier. Determine the average...
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...
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?
7) If f1= 5MHz and f2=7 MHz, find: a. 2nd order harmonics. b. 3rd order harmonics. c. 3rd order inter-modulation products (IMD) 8) In a superheterodyne receiver, the input RF frequency is 1 GHz. Find the IF frequency if the local oscillator frequency is 950 MHz? 9) Rank from 1 to 3 for linearity and efficiency with 1 as the most linear and most efficient. Class of amplifier Linearity Efficiency Class A Class B Class C 10) Which of the...
What's the energy of a photon with frequency of 317 Hz? –19 A. 1.62 × 10 W –19 B. 2.88 × 10 W –19 C. 1.36 × 10 W –19 D. 2.10 × 10 W 2. You need to splice two fibers. The transmitting core has a diameter of 75 μm, and the receiving core has a diameter of 62.5 μm. Calculate the power loss due to core diameter mismatch in dB. A. 3.06 dB B. 3.57 dB C. 1.25...
5.1 Determine the maximum and minimum spectral frequencies received from a stationary GSM transmitter that has a center frequency of exactly 1950.000000 MHz, assuming that the receiver is traveling at speeds of: (a) 1 km/hr; (b) 5 km/hr; (C) 100 km/hr; and (d) 1000 km/hr. 5.5 Given that the coherence bandwidth is approximated by Equation (5-39), show that a flat fading channel occurs when T, 2 10 04. Hint: Note that B is an RF bandwidth, and assume that Ts...