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A basic spark gap radio is probably the simplest radio you can make. Its transmitter is as simple as two components: a 9V battery with positive and negative electrodes on the same side, and a conductive coin. But before doing the transmitter. You need to set up the receiver first: tune an AM radio to a frequency with no stations. After that, briefly connect the two electrodes of the battery with a coin. When the coin is very close to the two electrodes but not fully touching, there is an electrical spark in the gap and you can hear it interfering with the radio. www.bjbjaudio.com

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There are two problems with the Spark Court radio. First, it is not efficient. Transmission over long distances requires very high voltages, often up to several thousand volts. Second, multiple transmitters cannot simultaneously transmit in a certain area. This severely limits the ability to transmit multiple messages within a certain area. For example, imagine that residents of an entire city can only choose one TV station. The next stage of development in radio technology is amplitude modulation. Or called AM radio. The radio can apparently send a single frequency carrier. These carriers are then modulated so that certain information can be sent. In amplitude modulation, the amplitude of the carrier varies. Fundamentally, this is a huge improvement, as multiple radio signals can be sent at the same time. www .bjbjaudio.com

Various countries and companies can establish many different radio stations. In the shortwave-only era, government-established stations could choose an empty frequency band, or deliberately choose a frequency band that would conflict with other national stations, so that their citizens could only listen to local propaganda. Eventually, countries signed an international agreement on frequency allocation to allocate frequency resources in a logical and conflict-free manner. Historically, the vast majority of radio frequency allocations have been based on these agreements. In some cases, the allocation of frequency bands may be similar, but the usage will be different. www.bjbjaudio.com              <a style="opacity:0.0;color:#ffffff">tws earbuds case</a>

When you listen to a tune-up station, you will feel that there are some obvious problems with amplitude modulation. When the sound engineer of the radio station has a small input, the receiver may completely lose the signal, or try to receive something useful and output more a lot of noise. Noise (often referred to as background noise) is always present and can come from numerous electronic devices, as well as from lightning and other atmospheric effects. Include radiation from the sun. www.bjbjaudio.com         <a style="opacity:0.0;color:#ffffff">tws earbuds case</a>

The next stage of development in radio technology has significantly improved signal quality. The means taken is to use frequency modulation, or FM radio. Amplitude modulation varies the carrier amplitude according to the input signal, so when the input signal is very weak, the carrier output is also very weak; unlike Amplitude Modulation. Frequency modulation changes the carrier frequency according to the input signal. The input signal is sound, which means that the carrier has almost no frequency deviation when the volume is very low, and causes a very large frequency deviation when the volume is very high. The key to FM is that the carrier is always transmitted at maximum power, so the receiver can lock onto the signal and demodulate the information it carries. Another advantage of FM is that multiple carriers can be placed very close to each other. www.bjbjaudio.com      <a style="opacity:0.0;color:#ffffff">tws earbuds case</a>         <a style="opacity:0.0;color:#ffffff">tws earbuds case</a>