Radio Receiver is used to receive information signals sent by Radio Transmitter. Radio Receiver consists of several parts as follows:

1. Antenna

In radio receivers, the antenna is used as a tool to receive signals sent by the transmitter via a channel (air, cable).

2. Decoder

Is the opposite of the encoder. The decoder is a tool for encoding the received signal. The decoder will change the received signal into the desired information signal. The decoder will return the signal to its original form as the signal sent by the transmitter

3. Demodulators

The demodulator is in charge of processing the output signal from the tuner, decoder or down converter. In principle, this section works in reverse with the modulator. If the modulator is in charge of superimposing or inserting the information signal into the carrier signal, then the demodulator actually separates the information signal from the modulated signal, so that the receiving side will get a signal that matches the original signal because the signal is insignificant on the receiving side before it is demodulated. the signal generated by the demodulator depends on the input signal and the local oscillator signal, so in this section unnecessary signals are discarded.