Rf Amplifier Circuit Am Radio

Using a signal generator a modulated signal is applied to the antenna terminals and if the stage is working properly the amplified signal will appear in the plate circuit across the interstage transformer t 2 to be passed on the converter stage.

Rf amplifier circuit am radio.

The 10 meters 27mhz cw radio amplifier is equiped with vn66af transistor produced by siliconix wich has some blf245 fm 88 108 mhz rf amplifier p. The preamplifier circuit provides a gain higher than 10 in the lw and mw range. In the final part of this chapter you will be shown some typical rf amplifier circuits. Am fm radio frequency amplifier this am fm radio frequency amplifier is built with only a few components.

The amplified signals are fed to antenna input of the am radio receiver for better reception. Noise figure is about 7 db at resonant frequency. Trouble shooting an rf stage is fairly straight forward. The rf amplifier circuit and tuning is the first area of the radio receiver that the signal encounters when it enters the radio.

However such a receiver need not have an transistor rf amplifier circuit following this tuned circuit. You can employ 1 4 watt resistors or even 1 2 watt resistors which are easier to manage. An input amplifier for a fm radio receiver with rf selection 88 108 mhz has been designed in the radio project. The working of the circuit is simple.

A radio receiver always has an rf section which is a tunable circuit connected to the antenna terminals. Transistor rf amplifier circuit. It is there to select the wanted frequency and reject some of the unwanted frequencies. The amplifier works well when it is connected to the rest.

The circuit can also work for short wave sw range depending on the quality of practical implementation. Mirror frequency rejection is between 5 db to 9 db. Which makes the project simple and direct. There are no electrolytic capacitors and the three capacitors used can be ceramic or mylar.

2 26 figure 2 19 is the schematic diagram of a typical rf amplifier that is used in an am radio receiver in figure 2 19 the input circuit is the antenna of the radio l1 a coil which forms part of an lc circuit which is tuned to the desired station by variable capacitor c1. Figure 2 19 is the schematic diagram of a typical rf amplifier that is used in an am radio receiver. It has about 25 db gain in the frequency rang 88 108 mhz.