FM band:?

Voice of China 89.1?

Voice of Music 107.8?

Liaoning Information 90.0?

Dalian News 100.8?

Dalian Finance 99.1?

Dalian University of Technology Radio 88.0 94.0?

Dalian City 93.1?

Dalian Community 95.6?

Dalian Maritime University Radio 97.8?

Dalian Transportation 103.3?

Dalian Music 106.7?

Liaoning Economy 87.5?

Liaoning Transportation 97.5?

Dalian Sports 105.7

The radio is the receiving equipment of the sound broadcasting system and is an audio-visual appliance. It restores the high-frequency signal received by the antenna into an audio signal, and adds it to the speaker to reproduce the sound.

A radio is constructed of mechanical devices, electronic devices, magnets, etc. It uses electrical energy to convert radio wave signals and is a machine that can listen to the audio signals emitted by radio stations. Also known as radio, broadcast, etc.

The high-frequency signal received from the antenna is detected (demodulated) and restored into an audio signal, which is then sent to headphones or speakers to become sound waves. The high-frequency signal received by the antenna is mixed with the local oscillation frequency of the radio (its frequency is higher than the external high-frequency signal by a fixed intermediate frequency.

The Chinese intermediate frequency standard is 465KHZ) through the input circuit and mixed in the frequency converter. ——Frequency conversion, the load loop (frequency selection) of the frequency conversion stage generates a new frequency, that is, the intermediate frequency generated by the difference frequency. The intermediate frequency only changes the frequency of the carrier wave, and the original audio envelope does not change. The intermediate frequency signal can be better Amplified, the intermediate frequency signal is detected and the high frequency signal is filtered out.