The power amplifier power 1-2W, 88-108MHZ FM transmitter power can be extended as far as 10-15W, single class c amplifier and multilevel low-pass filter consisting of pipe, has a high conversion efficiency and a strong call on inhibition ability.
Electric circuit as shown in the figure, with high power transmitting tube C1972, whose parameters are as follows: 175MHZ, 4 ≥ a, 25W, power gain parameters of 8.5dB, as shown in the figure, circuit center frequency is about 98MHZ, when you enter a 2W of RF power, rated output of 15W. For any of the 88~108MHZ frequency output reach ratings, according to the fore the center frequency for part of the component to make suitable adjustments. If necessary, can reduce low-pass series of waves, to increase the output power. After extended power signal consists of three levels of low-pass filter to filter high ciyibo compositions have fed into the transmitting antenna.
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