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For auto frequency tuning of TRIUMF cyclotron booster, a new control module based upon VXI Bus has been designed, tested and put into commission. This new auto tuning control module, which replaced the old analogue control box, has more features including the implementation of PIC16C71 microprocessor to generate Pulse Width Modulation (PWM) pulse, the utilization of digital RF phase detector and the most important aspect of computer control capability. Thus, the resonant frequency of cyclotron booster RF cavity is tuned automatically by this control module and the reflected RF power is kept at the minimum level in the operation.
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