| PSM (PULSE STEP MODULATION) technology has been rapid development in the last two decades, PSM short-wave transmitter with its high quality, high efficiency, stability, reliability, etc., in recent years has been widely applied. DF100A China produced 100 kilowatts PSM-based short-wave transmitter, over the past few years has been widely used so far in China there are hundreds in this series transmitters in use is the use of China's current production of the most high-power short-wave transmitters. The beginning of the launch pad in China's use of the series transmitters, the initial short-wave machine use and maintenance, there is no short-wave transmitter to the technical staff to maintain the basis for a new challenge.DF-100A-type PSM short-wave transmitter is manufactured in China, using a new type of PSM technology 100KW short-wave transmitters. RF amplification system it has introduced a number of foreign advanced technology and processes. The system is divided in accordance with the function, frequency synthesizer, RF gain control, wide-band amplifier, at the end of pre-amplifier circuit and high-class amplifier circuit at the end of the five parts. The introduction of the factory at the same time actively pursuing domestic production of key components, and made great achievements. Running through the years found that after running the model after the transmitter to maintain low, stable operation. Stable operation of large-scale systems due to RF success of anti-design. Models of the application of a large number of stations in the grass-roots level, in order to deal with routine maintenance and troubleshooting of user-friendly, it is necessary for RF amplification system based on functional-depth study and discussion.This paper introduces the use of PSM technology, high-power short-wave radio transmitter amplification system changes from the old machine to new machine by a new development and adoption of new technologies. Around the tube and radio new stable release of these two key issues, focusing on analysis of the PSM transmitter RF amplification systems, fully reflects the PSM transmitter has good stability, high efficiency and low cost advantages.Through the past few years have occurred on the transmitter failure analysis, high-cycle fault inactive part of the total inactive time of time of about 70%, and 90% for the tube failure, slot Road and harmonic filter failures, concluded that part of this is the focus of machine maintenance and breakdown of the parts are divided into capacitor failure, two types of inductor failure to carry out specific repair and maintenance work.At the same time, for it appears in the operation of different states are on the front panel through the transmitter failure alarm indicator, maintenance staff only through the fault indicator instructions, can be targeted to the point of failure to find as soon as possible and in time, therefore the maintenance of master fault is only indicative of the circuit and working principle, be faster, more accurate handling of the fault. According to the past few years to participate in the series transmitter installation, commissioning and operation and maintenance of information and experience accumulated on the fault direction of the circuit and working principle of summing up to be and to provide a number of typical faults. |
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