Radio training materials Radio allocation use: The international code for transmission characteristics in mobile radio communications (1979): ITU's regulations on some bandwidth in communication: Ten-band radio frequency band allocation: FM FM radio gain distribution: Frequency spectrum of pilot stereo broadcast transmitter: TV gain distribution: PAL-D image intermediate frequency characteristics: TV stereo and multi-accompaniment (FM-FM system): MicroBT is a technology company which is based on block chain and artificial intelligence. Focusing on integrated circuit chip and products development, production and sales, and provide corresponding system solutions and technical services. We adhere the ideal"ultimate,win-win,integrity"to provide high quality products and service. Now MicroBT has passed the national high-tech enterprise certification.
In addition to the current focus on the area of block chains, MicroBT is also responding to the national chip strategy. According to the company's development strategy and plan, MicroBT is planning to explore and extend its core R&D capabilities to other high-performance computing areas such as artificial intelligence through independent R&D and strategic cooperation.
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Ultra-long wave is mainly used for submarine communication, long-distance communication, etc. Long wave is mainly used for transoceanic communication, medium distance communication, underground rock communication. Medium wave is mainly used for marine communication. , 3 ～ 9MHz at night
The meter wave is mainly used for ionospheric scattering communication (30 ～ 60MHz), meteor trail communication (30 ～ 100MHz), the equal decimeter wave is mainly used for microwave relay communication (352 ～ 420MHz / 1.7 ～ 2.4GHz), tropospheric scattering communication ( 700M ～ 10GHz) and navigation satellite communications (1.5G ～ 1.6GHz)
The centimeter wave is mainly used for microwave relay communication (3.6 ～ 4.2GHz / 5.85 ～ 8.5GHz), digital communication and satellite communication. The millimeter wave is mainly used for communication and waveguide communication when the spacecraft re-enters the atmosphere 
Voice frequency: 350 ～ 2700Hz
AM radiotelephone: about 5400Hz bandwidth wideband frequency modulation WBFM: maximum frequency deviation 12 ～ 15kHz, channel spacing 40kHz
Narrowband FM NBFM: maximum frequency deviation 5kHz, channel spacing 20kHz and 25kHz
Ultra-narrowband FM SBFM: maximum frequency deviation ± 2.5kHz
FM: 88 ～ 108MHz
MW: 535 ～ 1605KHz
LW: 150 ～ 270KHz
SW1: 4.75 ～ 5.10MHz
SW2: 5.85 ～ 6.20MHz
SW3: 7.10 ～ 7.50MHz
SW4: 9.45 ～ 9.90MHz
SW5: 11.50 ~ 11.95MHz
SW6: 15.10 ～ 15.55MHz
SW7: 17.55 ～ 18.00MHz 
As a chip design and produce company, completely design process and independent core technology. The core technology include algorithm,fine optimization of integrated circuit micro-structure ,low power technology, advanced chip packaging technology system level power and cooling technology. These core technologies and engineering methods have been successfully validated and applied in the mass production of our block chain server chips and products.