Table of Contents
- 1 How do you calculate the image frequency of a superheterodyne receiver?
- 2 What is the formula of image frequency Mcq?
- 3 What is image frequency in radio receiver?
- 4 Which is correct in superheterodyne receiver?
- 5 How many triodes does a superheterodyne receiver have?
- 6 What is the heterodyne difference frequency of an Lo?
How do you calculate the image frequency of a superheterodyne receiver?
Calculation of the Image-Frequency
- f1 = foscillator + fIF
- f2 = foscillator – fIF
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 and what is image frequency Rejectionratio?
The image rejection ratio, or image frequency rejection ratio, is the ratio of the intermediate-frequency (IF) signal level produced by the desired input frequency to that produced by the image frequency. The image rejection ratio is usually expressed in dB. In a good design, ratios of >60 dB are achieveable.
How do you calculate image rejection?
The image rejection ratio of the superheterodyne receiver is defined as:
- ρ
- I R R = α = 1 + 100 2 × 1.39 2.
- I R R = α = 1 + 19321.
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 is correct in superheterodyne receiver?
The correct sequence of components is, therefore: RF Amplifier, followed by Mixer, followed by Demodulator, followed by AF Amplifier. A superheterodyne receiver changes the RF frequency to a lower IF frequency. This IF frequency will be amplified and demodulated to get a video signal.
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 are the disadvantages of a superheterodyne receiver?
One major disadvantage to the superheterodyne receiver is the problem of image frequency. In heterodyne receivers, an image frequency is an undesired input frequency equal to the station frequency plus (or minus) twice the intermediate frequency.
How many triodes does a superheterodyne receiver have?
The first commercial superheterodyne receiver, the RCA Radiola AR-812, brought out March 4, 1924 priced at $286. It used 6 triodes: a mixer, local oscillator, two IF and two audio amplifier stages, with an IF of 45 kHz.
What is the heterodyne difference frequency of an Lo?
As its signal was being fed into a second receiver in the same device, it did not have to be powerful, generating only enough signal to be roughly similar in strength to that of the received station. When the signal from the LO mixes with the station’s, one of the outputs will be the heterodyne difference frequency, in this case, 60 kHz.