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Wide-band Frequency Transmission Network Technology is an innovative technology using one Wide-band frequency transmitter to achieve multi-channel transmitting, solving the existing problems of single-channel system in one fell swoop. It is conducive to build up the terrestrial digital TV multi-channel single frequency network with effective coverage and strong stability.
With this innovative technology, our one set of transmitter can transmit multiple TV channels, breaking through the limitation that the traditional transmitter only can do the single channel transmitting, which makes the investment in digital TV system significantly reduced, and our transmitter also do not need to use the high power synthesizer, realizing the adjacent channel transmitting, it dramatically increase the utilization of wireless frequency resource, and the transmitting frequency can be modified at any time in the transmitting process. since we just need one set of transmitter to build the network, the later stage energy consumption and the operation cost will be dramatically reduced. Building the network with only one transmitter, it is relatively simple than the traditional networking method, it can effectively reduce the failure rate; this will effectively reduce the maintenance cost. Because our transmitter have reduced the power combiner insertion loss, this will increase the effective power of the transmitter, therefore, under the equal transmitting power, our Wide-band frequency transmitter can cover more large area than the traditional single-channel transmitter, achieve the goal that covering the large area with low power.
Main Features
470--862MHz Wide-band frequency response and low noise design
Design of low power consumption and linearization advances emitting power of the transmitter and reduces nonlinear distortion.
Very low group delay feature, suitable for digital signal transmission.
ALC keeps output of constant power, output VSWR detecting protection
Apply to single-channel or multi-channel UHF digital television transmission system
Be used in the Wide-band frequency repeating of HFC, AML, or MMDS digital TV signal
Realize wireless network coverage of digital TV at a low cost.
Modular design simplifies installation, field services and upgrade.
Automatic and manual switching backup systems available.
Build-in lightning protector with current-dividing series power prevents lighting surge and instant overvoltage.
Local monitoring and control.
Wireless remote monitoring and control (Optional)
Functional Block Diagram
Technical Specifications
Wide-band frequency transmitter performance characteristics
In addition to meet the general requirement of the national standard terrestrial digital TV transmitter, the Wide-band frequency transmitter should have the following characteristics:
I. Wide-band frequency response and low noise design
Transmitter adaptive frequency bandwidth≥120MHz. Within the frequency bandwidth range, the transmitting frequency point can be adjusted freely at any time without affecting the overall transmitter performance. On the system Wide-band frequency transmitting status, the spectrums shoulder distance @ fcenter±4.2MHz≤-40dBc,(fcenter±64MHz)≤-32 dBc. The equipment noise figure≤6 dB.
II. Modular structure, the power amplifier module hot plug design, to facilitate onsite equipment maintenance.
Balanced coupling structure, without the power combiner. On the multiple group power amplifier modules status, one group power amplifier module can be hot-swappable, in addition to lower transmission power, the machine performance doesn’t be affected.
III. The Power is measured by the output port full digital power. The equipment power should not be measured by 1dB Gain compression point output power. The equipment total power efficiency should not be less than 18%.
IV. Frequency stability < 5×10-8(Using an internal reference source), < 5×10-11(using an external reference source), meet the needs of Wide-band frequency adjacent channel transmitting.
V. Meet the transmitting coverage needs in different power levels, having the high-power Wide-band frequency transmitter type which digital power no less than 800W.
Terrestrial digital TV planning & design ability
Based on a wealth of long-term engineering experience of networking construction; under the strong support of professional institutions; with the assistance of professional design software and detailed and accurate geographic data, CEKE formed a good terrestrial digital TV network planning and design capabilities.