Table of Contents
- 1 What is the frequency of local oscillator?
- 2 What is image frequency of super heterodyne receiver?
- 3 Which oscillator is used as a local oscillator in radio receiver?
- 4 Which oscillator is used as local oscillator in superheterodyne radio receiver?
- 5 What is the formula of image frequency Mcq?
- 6 What is image frequency in radio receiver?
- 7 What is the frequency of the superheterodyne receiver image?
- 8 What is a superhet radio and how does it work?
What is the frequency of local oscillator?
Local oscillator frequency range is 995 KHz to 2105 KHz for MW band.
What is image frequency of super heterodyne receiver?
A super heterodyne receiver operates in the frequency range of 58 MHz β 68 MHz. The. intermediate frequency ππΌπΉ and local oscillator frequency ππΏπ are chosen such that ππΌπΉ β€ ππΏπ. It is required that the image frequencies fall outside the 58 M Hz β 68 MHz band.
What is the image of 1000 kHz signal if if 470 kHz?
What is the image of 1000 kHz Signal if IF = 470 kHz? Ans. Image frequency = fs + 2 IF = 1000 + (2 x 470) = 1960 kHz.
Why local oscillator frequency in AM receiver is chosen above the incoming signal frequency?
This was chosen for ease of creating bandpass filters and easy amplification. Later, for FM sets, the IF was 10.7 MHz. To mix an RF frequency to such a low IF, one has a choice of putting the local oscillator above or below the RF frequency, because either way, the difference frequency will be at the IF.
Which oscillator is used as a local oscillator in radio receiver?
triode
The triode is used as the local oscillator, and the pentode is used as the mixer.
Which oscillator is used as local oscillator in superheterodyne radio receiver?
The signal is then fed into a circuit where it is mixed with a sine wave from a variable frequency oscillator known as the local oscillator (LO). The mixer uses a non-linear component to produce both sum and difference beat frequencies signals, each one containing the modulation contained in the desired signal.
What is image frequency in FM receiver?
The image frequency is an undesired input frequency which is demodulated by superheterodyne receivers along with the desired incoming signal. This results in two stations being received at the same time, thus producing interference.
What is image frequency signal?
In wireless systems using heterodyne tuning systems, Image Frequency is an undesired carrier frequency that differs from the frequency to which a superheterodyne receiver is tuned by twice the intermediate frequency.
What is the formula of image frequency Mcq?
Classification of Receivers MCQ Question 1 Detailed Solution The oscillator frequency is always greater than or smaller than the tuned incoming frequency by IF, i.e. The image frequency is calculated as: fsi = fs + 2 I.F.
What is image frequency in radio receiver?
In heterodyne receivers, an image frequency is an undesired input frequency equal to the station frequency plus (or minus) twice the intermediate frequency. The image frequency results in two stations being received at the same time, thus producing interference.
Which oscillator is used in radio receiver?
Explanation: Oscillator which is used as a local oscillator in radio receiver is generally a tuned circuit. This tuned circuit consists of inductors and capacitors to determine the resonant frequency, therefore it is an LC tuned circuit.
What type of oscillator is used in FM receiver circuit?
The reference frequency generator used in this circuit is generally a quartz oscillator with high accuracy and low frequency fluctuation. By the way, many radio receivers currently on the market can receive both AM and FM broadcasts.
What is the frequency of the superheterodyne receiver image?
Concept of the superheterodyne receiver image With the local oscillator set to 0.75 MHz and with an IF of 0.25 MHz, it has already been seen that a signal at 1.0 MHz mixes with the local oscillator to produce a signal at 0.25 MHz that will pass through the IF filter.
What is a superhet radio and how does it work?
The superhet radio converts signals to a fixed frequency intermediate frequency, and this enables it to remove unwanted signals more effectively than other forms like the TRF (Tuned Radio Frequency) sets or even regenerative radios that were used particularly in the early days of radio.
Which devices use the superheterodyne principle?
Virtually all broadcast radio receivers, as well as televisions, short wave receivers and commercial radios have used the superheterodyne principle as the basis of their operation.
What is a local oscillator in a superhet radio?
Local oscillator: Like other areas of the RF circuit design, the local oscillator circuit block within the superhet radio can take a variety of forms. Early receivers used free running local oscillators.