wireless transmission technology solutions
Digital TV single frequency network refers to a wireless digital TV network where transmitters located at multiple different sites broadcast the same stream of programs at the same time and on the same frequency. Digital TV single frequency network can achieve wide range wireless signal coverage using multiple small and medium power transmitters. Its key technical feature is to provide a unified time and frequency reference through GPS or Beidou receivers, thereby accurately achieving the same frequency broadcast of multiple transmitters. The specific principle diagram is shown in the following figure.。
FM radio single frequency network refers to a wireless FM radio network in which transmitters located at multiple different sites use the same frequency and broadcast the same content programs at the same time. FM radio single frequency network can achieve wide range wireless signal coverage using multiple small and medium power transmitters. The key technical feature is to provide a unified time and frequency reference through GPS or Beidou receivers, thereby accurately realizing the same frequency broadcast of multiple transmitters. The key technical issue in simulating FM synchronous network networking is to deal with the problem of multiple paths. The specific principle diagram is shown in the following figure.
The multi machine solution in one cabinet refers to integrating multiple transmitters of different small and medium power levels into one cabinet, achieving simultaneous operation of multiple frequency point transmitters in one cabinet. This scheme can save the space occupied by the transmitter, and by adding a multiplexer, multiple transmitters can share one antenna output, saving the investment in antenna lines. The shared antenna in this scheme needs to be designed for broadband in the frequency band and have good isolation. At present, we can provide digital TV transmitters of 100W~300W, 1 cabinet with 7 units, and 500W~1KW, 1 cabinet with 4 units. FM radio transmitter 1KW, 1 cabinet, 7 machines, etc.
The N+1 transmitter primary backup system scheme refers to using one broadband transmitter online as a backup for multiple primary transmitters to achieve the N+1 backup scheme. When one of the main transmitters fails, the automatic switching device drives the coaxial switch to turn off the RF output of the faulty host. At the same time, the backup machine automatically switches to the frequency of the faulty main transmitter for broadcasting, thereby reducing the outage rate. The RF output of the faulty host will automatically switch from the antenna to the false load for timely maintenance. This plan has a low investment cost as it involves multiple backups.
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