Different types of digital intercom devices can be divided into several types: cost, DPMR, TETRA, cloud intercom. DPMR: The lowest cost, widely used with amateur users, hotel travel catering and other scenarios. DMR: High cost, suitable for industry users, such as mining, forestry, security, etc. TETRA: The most cost-effective, suitable for occasions with high security requirements, such as the military, public security and so on. Cloud intercom: low cost, based on public network digital signal transmission, suitable for a wide range of industries. dPMR (digital Private Mobile Radio) is a standard digital walkie-talkie standard developed by ETSI. Applicable to commercial, professional and public safety users; dPMR uses 6.25KHz FDMA technology, 4FSK modulation, data transmission rate of 4.8Kb / s. Based on this technology, standards such as NXDN and DCR have been developed in succession. The PDT standard is a cluster communication standard with China's independent intellectual property rights. It focuses on the future development of digital intercom technology and can meet the needs of users in most cluster communication industries. The PDT standard fully considers China's national conditions and draws on the internationally mature standard technologies (such as Tetra, P25, DMR, MPT1327, etc.) for reference and innovative design, following cost-effective, secure and confidential, large-area system, scalable and backward compatible. The five principles have effectively solved the problem of multiple emergency communication network convergence communications.
PDC cutters for oil&gas drilling bits is produced by using the higher degree of diamond powder and tungsten carbide substrate. Microstructure with complete C-C bond combination is characterized between the diamond grains in polycrystalline diamond layer, which allows the high strength, hardness and wearing property of diamond layer. We adopt many types structure of the interface between diamond layer and carbide , and use the special technological post-processing in order to effectively reduce residual stress of PDC while make the interface combination firmer and more symmetrical. So PDC cutter displays satisfying thermal stability, higher impact resistance and excellent performance.
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