Radio Receivers

Radio Receivers:

Amplitude Limiter in FM Receiver : In order to make full use of the advantages offered by FM, a demodulator must be …


Automatic Frequency Control Block Diagram : Automatic frequency control: As previously we see, the heart of an AFC circuit is a frequency-sensitive …


Communication Receiver Block Diagram : A Communication Receiver Block Diagram is one whose main function is the reception of signals used for …


Delayed Automatic Gain Control : Delayed Automatic Gain Control: Simple AGC is clearly an improvement on no AGC at all, in that …


Direct Synthesizer Block Diagram : A Direct Synthesizer Block Diagram is a piece of apparatus in which multiples and submultiples of a …


FM Receiver Block Diagram : The FM receiver is a superheterodyne receiver, and the FM Receiver Block Diagram of Figure 6-28 shows …


Frequency Changing and Tracking in Receivers : The mixer is a nonlinear device having two sets of input terminals and one set …


Indirect Synthesizer : The required frequency range in most synthesizers nowadays is obtained from a variable voltage-controlled oscillator (VCO), whose …


Intermediate Frequency Amplifier : Choice of frequency: The Intermediate Frequency Amplifier (IF) of a receiving system is usually a compromise, since there …


Phase Discriminator : This Phase Discriminator is also known as the center-tuned discriminator or the Foster-Seeley discriminator, after its inventors. It is …


Product Demodulator : The Product Demodulator (or detector), as shown in Figure 6-44, is virtually a mixer with audio output. It is …


Ratio Detector Circuit : In the Foster-Seeley discriminator, changes in the magnitude of the input signal will give rise to amplitude changes …


Receiver Types : There are Two Receiver Types namely, Pilot Carrier Receiver and a Suppressed Carrier Receiver; the suppressed carrier receiver incorporates …


Simple Diode Detector : Operation of diode detector: The Simple Diode Detector is by far the most common device used for AM …


Slope Detector FM Demodulation : Consider a frequency-modulated signal fed to a tuned circuit whose resonant frequency is to one side of …


Squelch Circuit : Squelch (muting): When no carrier is present at the input, i.e., in the absence of transmissions on a given channel …


Stereo FM Multiplex Reception : Assuming there have been no losses or distortion in transmission, the demodulator output in a Stereo FM …


Superheterodyne Principle : The block diagram of Figure 6-2 shows a basic superheterodyne receiver. In the Superheterodyne Principle, the incoming signal voltage …


Transistor RF Amplifier Circuit : A radio receiver always has an RF section, which is a tunable circuit connected to the antenna …


Tuned Radio Frequency Receiver : The Tuned Radio Frequency Receiver is a simple “logical” receiver. A person with just a little knowledge …


Working Principle of Automatic Gain Control : Working Principle of Automatic Gain Control is a system by means of which the overall …