Radio Frequency Allocation Table 1. Frequency band allocation and main uses name Very low frequency Low frequency IF high frequency VHF UHF UHF Very high frequency symbol VLF LF MF HF VHF UHF SHF EHF frequency 3-30KHz 30-300KHz 0.3-3MHz 3-30MHz 30-300MHz 0.3-3GHz 3-30GHz 30-300GHz Band Ultra-long wave Long wave Medium wave shortwave Mipo Decimeter wave Centimeter wave Millimeter wave wavelength 1KKm-100Km 10Km-1Km 1Km-100m 100m-10m 10m-1m 1m-0.1m 10cm-1cm 10mm-1mm Propagation characteristics Space waves dominate Ground wave Ground wave and sky wave Sky wave and ground wave Space wave Space wave Space wave Space wave The main purpose Coastal submarine communication; long-distance communication; ultra-long-distance navigation Transoceanic communication; medium distance communication; underground rock communication; long distance navigation Marine communications; amateur radio communications; mobile communications; mid-range navigation Long-distance short-wave communication; international fixed-point communication Ionospheric scattering (30-60MHz); Meteor trail communication; Artificial ionospheric communication (30-144MHz); Communication to space vehicles; Mobile communication Small capacity microwave relay communication; (352-420MHz); Tropospheric scattering communication (700-10000MHz); Medium capacity microwave communication (1700-2400MHz) Large-capacity microwave relay communication (3600-4200MHz); large-capacity microwave relay communication (5850-8500MHz); digital communication; satellite communication; international maritime satellite communication (1500-1600MHz) Communication when reentering the atmosphere; waveguide communication 2. Frequency allocation of land mobile radio services in China 29.7-48.5MHz 156.8375-167MHz 566-606MHz 64.5-72.5MHz (mainly broadcast, shared with broadcast service) 167-223MHz (mainly broadcast services, fixed and mobile services second) 798-960MHz (common with broadcasting) 72.5-74.6MHz 223-235MHz 1427-1535MHz 75.4-76MHz 335.4-399.9MHz 1668.4-2690MHz 137-144MHz 406.1-420MHz 4400-5000MHz 146-149.9MHz 450.5-453.5MHz 150.05-156.7625MHz 460.5-463.5MHz 3. Table of frequency allocation for amateur radio Serial number Frequency (MHz) use Serial number Frequency (GHz) use 1 1.8-2.1 Share 15 1.24-1.30 secondary 2 3.5-3.9 Share 16 2.30-2.45 secondary 3 7.0-7.1 dedicated 17 3.30-3.50 secondary 4 10.1-10.15 secondary 18 5.65-6.35 secondary 5 14-14.25 dedicated 19 10-10.5 secondary 6 14.25-14.35 Share 20 24-24.25 secondary 7 18.068-18.168 Share twenty one 47-47.25 Share 8 21-21.45 dedicated twenty two 75.5-76 Share 9 24.89-24.99 Share twenty three 76-81 secondary 10 28-29.7 Share twenty four 142-144 Share 11 50-54 secondary 25 144-149 secondary 12 144-146 dedicated 26 241-248 secondary 13 146-148 Share 27 248-250 Share 14 430-440 secondary 28 * Shared for amateur services as the main business and other services shared frequency band; dedicated for amateur services as the dedicated frequency band; secondary for amateur as a shared frequency band with other services Among them, 2-9 or 12 can be used for natural disaster communication; 160MHz-162MHz is the meteorological frequency band. 4. Table 1 for frequency division of cordless phones Number of groups Landline transmission frequency (MHz) Mobile phone transmission frequency (MHz) 1 48.000 74.000 2 48.025 74.025 3 48.050 74.050 4 48.075 74.075 5 48.100 74.100 6 48.125 74.125 7 48.150 74.150 8 48.175 74.175 9 48.200 74.200 10 48.225 74.225 11 48.250 74.250 12 48.275 74.275 13 48.300 74.300 14 48.325 74.325 15 48.350 74.350 16 1.665 48.375 17 1.690 48.400 18 1.715 48.425 19 1.690 48.450 20 1.740 48.475 5. Table 2 of frequency division of cordless telephone Number of groups Landline transmission frequency (MHz) Mobile phone transmission frequency (MHz) 1 45.000 48.000 2 45.025 48.025 3 45.050 48.050 4 45.075 48.075 5 45.100 48.100 6 45.125 48.125 7 45.150 48.150 8 45.175 48.175 9 45.200 48.200 10 45.225 48.225 * Table 1 was formulated in 1985 by China's non-committee, and Table 2 was formulated in 1992. The channel interval of the cordless telephone is 25KHz, the landline transmission power shall not exceed 50mW, and the mobile phone transmission power shall not exceed 20mW. The emission categories are F3E; F1D; G3E. 6. Radio and TV frequency allocation table Band Frequency (MHz) Station interval use LF (LW) 120-300KHz —— Longwave AM broadcast MF (AM) 525KHz-1605KHz 9KHz Medium Wave AM Radio HF (SW) 3.5-29.7MHz 9KHz Shortwave AM broadcast and single sideband communication VHF (FM) 88-108MHz 150KHz FM broadcast and data broadcast VHF 48.5-92MHz 8MHz TV and data broadcasting VHF 167-223MHz 8MHz TV and data broadcasting UHF 223-443MHz 8MHz TV and data broadcasting UHF 443-870MHz 8MHz TV and data broadcasting 7. Toy radio remote control and communication frequency table communication device Bandwidth (KHz) Transmit power (mW) Frequency (MHz) Remote control equipment Bandwidth (KHz) Transmit power (W) Frequency (MHz) 1 <12 ≤100 26.965 1 ≤8 ≤1 26.975 2 <12 ≤100 26.985 2 ≤8 ≤1 26.995 3 <12 ≤100 27.005 3 ≤8 ≤1 27.015 4 <12 ≤100 27.025 4 ≤8 ≤1 27.045 5 <12 ≤100 27.055 5 ≤8 ≤1 27.065 6 <12 ≤100 27.075 6 ≤8 ≤1 27.095 7 <12 ≤100 27.105 7 ≤8 ≤1 27.115 8 <12 ≤100 27.125 8 ≤8 ≤1 27.145 9 <12 ≤100 27.165 9 ≤8 ≤1 27.195 10 <12 ≤100 27.185 10 ≤8 ≤1 27.255 * Communication equipment emission categories: H1A; R1A; J1A; A1A; F1A; H3E; R3E; J3E; A3E; F3E 8. Description of the international code for emission characteristics New code Explanation Old code A1A Double-sided telegram with constant amplitude A1 A2A Double-sided telegram with constant amplitude A2 H2A Single sideband full carrier amplitude modulation health control telegram A2H A3E Two-way AM phone A3 H3E Single sideband full carrier telephone A3H R3E Single-sideband reduced carrier phone A3A J3E Single Sideband Suppressed Carrier Telephone A3J F3E FM phone F3
Gaming headphones, which are suitable for playing games, have extraordinary sound quality - true, clear, and surrounding feeling makes your pulse accelerate and excited.For game users, a high-performance Gaming Headset allows players to experience the immersive feeling in the game. For the gaming players, the gaming headset should also be able to assist the game player to improve combat effectiveness.
Among so many headsets, Gaming Headsets have a sensitivity advantage. The relatively closed listening environment is also more conducive to the game player to feel the details of the sound and improve the judgment of the sound. Therefore, compared with the traditional headphones, the gaming headset has the advantage of positioning ability, and can express the sense of direction of the sound, and is more suitable for expressing the sound clearly in the 3D games. Moreover, the game headsets that serve the player generally also enhance the low-frequency sense, thereby promoting the game plot and making it easier for the player to fully devote himself to the game, thereby achieving "listening to the voice and walking through the hundred steps."
Gaming Headsets Wireless Gaming Headphones,Bluetooth Gaming Headset,Gaming Headset,Wireless Gaming Headset Shenzhen Linx Technology Co., Ltd. , https://www.linxheadphone.com
June 04, 2020