A controller has been developed that forms a sequence of rectangular RF pulses, performs a fast synchronous (synchronized with the pulse sequence) analog-to-digital (AD) conversion of the electric signals, writes digital data in to the RAM, and transmits these data to the ISA (IBM PC) bus. The program control of the position and duration of the formed pulses (with a step of 20 ns), as well as of the carrier frequency of RF pulses (up to 25 MHz with a step of 0.01 Hz), is ensured. The fast parameters of the AD conversion are the following: the digit capacity is eight bit and the sampling frequency is 50 MHz.
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