What is an AM / FM wave?
The modulation method that changes the carrier amplitude according to the modulation signal is called amplitude modulation. The radio wave after amplitude modulation is called amplitude modulation wave. It maintains the frequency characteristics of the high-frequency carrier, but the shape of the envelope is similar to the signal waveform. The amplitude of the AM wave is determined by the strength of the modulated signal. The amplitude modulation wave is represented by the English letter AM.
The modulation method that changes the carrier frequency according to the modulation signal is called frequency modulation. The magnitude of the modulated wave frequency change is determined by the size of the modulated signal, and the period of the change is determined by the frequency of the modulated signal. The amplitude of the modulated wave remains unchanged. The waveform of the FM wave is like a spring compressed unevenly. The FM wave is represented by the English letter FM.
At present, the frequency band used by medium-wave broadcasting is roughly 550kHz-1600kHz, which is mainly propagated by ground waves, and is also accompanied by some sky waves; FM radio broadcasting uses ultra-short wave (very high frequency) radio waves to transmit signals, and the frequency of use is about 88MHz-108MHz. The signals are mainly transmitted by space waves.
Dongguan Deli Plastic Co.,Ltd is a manufacturer specialized in the research, development ,plastic injection mould and making mass production with well-equipped facilities and strong technical force.
Our products are extensively used in household industry/electronic industry/automobile industry/building industry and other industries.
We have rich experience on one-stop solution, provide various services from new product design,prototype,mold making,mass production,assembly and logistics. The most important advantage is we have our own R&D team to help clients to turn ideas into actual parts. All of these engineers and designers have over 15 years experience in these plastic products fields.
We have a strict quality control system, an excellent management team and also a dedicated sales force, enable us to fulfill our commitment in high quality products and outstanding services.
If you are looking for a trustworthy supplier of customized items, please do not hesitate to contact us. We are always striving to establish a win-win partnership with customers from all over the world and help our partners to stay one step in front of your competitors.
Circulating Fan,Circulating Usb Fan,Circulating Mini Handy Fan,Desktop Circulating Small Fan
Guangdong Aiyimi Electronic Technology Co., Ltd. , https://www.seventreasuresfan.com