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A very important factor is the time the coil is energized versus the time the response is fed into the amplifier . Also the time between energizing and the time the response time starts . I am using the SN 74154 to get a nice puls train from an oscillator . The oscillator will determine the time t of one puls . The faster the oscillator the shorter the puls . Variable oscillators will therefor give a different puls time . Deviding a regular oscillator by using a CD 4040 BCN will give you another 12 possibilities . You see that with a set-up like that you can experiment as much as you want . In the field something like this set-up would give you all kinds of search modes and time . I like to get away from too much computer stuff around my magnetometer . It can all go haywired and what are you going to do then when you are out in the field or on the ocean ? I do not keep it too simple , but I like to keep it where I can repair it in an instant . Cornelius