Radio Receiver Circuit Diagram

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Radio Receiver Circuit Diagram

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6, which shows the equivalent circuit for the arrangement in Fig. 5, it is seen that the feedback voltage is divided between the potentiometer R3 (dependent on the setting of the volume control) in series with the parallel network Ri and i?2 + jRd (diodedamping). The equivalent resistance of Rlt R2 and Rd is 0.115 Mfl for weak signals, and 0.23 MQ for strong signals. When the volume control is turned up fully, the grid of the A.F. valve receives ^ryp =0.054 X the feedback voltage on weak FM receivers operating in the VHF range require special methods of FM detection like phase shift discriminator and radio detection. Radio paging service is a special feature of FM radio. Communication receivers are highly sensitive receivers having

special.features like double conversion, AFC and squelch (muting) system. REVIEW QUESTIONS 1 . What are the main functions of a radio receiver? 2. Draw the circuit diagram of a crystal receiver set and explain its working. 3. What are Transmitters, Receivers and channels are three important items in radio communication. Block diagrams of For deriving harmonic frequency from a pure sine voltage, the pure sine voltage is first of all distorted by some means to produce harmonic and then the output tank circuit is tuned to the required harmonic for rejecting all frequency components except the needed one. The mathematical The circuit diagram of Class C harmonic generator is also described. An idea for the use The best cure for a

bad.IF or RF transformer is replacement, not always available today, we must place more emphasis on repair of the transformer. Figure 5.12A shows the basic circuit for Fig. 5.11 Two ways of broadening the response of an LCIF transformer. R L R S1 but because old IF and RF transformers are a singletuned IF transformer (others might Fig. 5.12 Singletuned IF transformer: (A) circuit diagram; (B) broken. 54 THE TECHNICIAN'S RADIO RECEIVER HANDBOOK.Figure 94 is the circuit diagram of a typical amplitude modulated radio receiver that employs many of the types of circuits that have been discussed in the preceding chapters, along with some additional ones. Let us now discuss the operation of this circuit in detail. The +12 V dc voltage needed

for.the various stages is obtained at the output of a fullwave bridge power supply at the lower lefthand corner of the diagram. In each of the dc voltage power supplies studied in Chapter 2 it was Brief description of the circuits within each block are given below with reference to the circuit diagram of the complete system shown in Fig. 2. FM receiver: This subcircuit is based on the popular Sony singlechip radio IC CXA1019S (30pin DID. The IC is designed for economy receivers for FM and AM radio as well as TV applications. But in the present circuit this IC has been wired for FM reception only. This IC also includes a tuning meter/ LED driver circuit for fine tuning indication.Audio Waves R F R a d ia tio n (a) (b) Figure1.4 (a)

AsimpleAM.receiver circuit.Theresistor representsahighinput impedanceearphone. (b) A physical realization of the simple AM receiver circuit. Radio and wireless communication Early radiosystemswere essentially allpassive. Tosee thislook intothe backofan oldradio where a few active devices (vacuum tubes or transistors) are surrounded by tens tohundreds of passive devices. Consider the circuit diagram of a very simple AM Build Your Own Transistor Radios covers: Calibration tools and test generators TRF, regenerative, and reflex radios Basic and advanced superheterodyne radios Coilless and softwaredefined radios Transistor and differentialpair oscillators 8.3.2 Superheterodyne receivers Practically all receivers used today are

superheterodyne.receivers. In this arrangement, the HF signal coming from the antenna has an oscillator frequency superimposed on it in a mixer, and is converted into an intermediate frequency. A distinction is drawn between two types of heterodyne receivers, these being receivers with down converters, and receivers with up converters. Figure 8.5 shows a simplified block circuit diagram of a radio receiver as D.C. stability of the oscillator circuit is further improved by using a temperaturedependent resistor for R11. COMPLETE RECEIVERS We have now considered how transistors can be used to perform many of the functions required in radio and television receivers. In modern equipment much of the circuitry is embodied in i.c.s. This is

illustrated.in Fig. 12.16 which gives the circuit diagram of an f.m.a.m. radio receiver designed for operation from batteries or mains. The only functions not 

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