Introduction to Functions of Radio Receiver
i) From antenna it amplifiers the radio frequency signals.
ii) It chooses the wanted radio station from several radio stations, and rejects all others not wanted signals.
iii) It enhances selectivity of the receiver.
WORKING
In the circuit, BF 194 B(NPN) transistor is employed like an amplifier. Tuned transformers are linked in the input and output section, tuning condensers are along with the transform windings. Therefore the combination of coils and condensers server like tuned circuits. With this tuned network an antenna is connected.
The electromagnetic waves are converted by antenna into RF electrical signals. After that the wanted signals are selected through the tuning condensers. These types of signals are feed to the amplifier for amplification. The transistor gets the particular signals and amplifies them.
ADVANTAGES
1. It enhances signal to noise ratio
2. It raises selectivity and sensitivity of the receiver.
DISADVANTAGE
1. They are much more unstable.
FREQUENCY CONVERTER
Frequency converter is also termed as first detector. The roles of mixer and local oscillator are merged in a single stage that is termed as converter. It is one of the main significant stages in the Superhetrodyne receiver.
FUNCTIONS
1. Local oscillator produces unmodulated R.F signal (Oscillator signal)
2. Mixer mixes the oscillator signal along with the incoming signal.
3. Converter provides IF signal in the output
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