and pressure will be used to modulate this high frequency carrier signal which is above 10 5 khz and typically in the order of 200 khz or higher in accordance with the value of the parameters consequently at the surface the variation in the high frequency f m signal will be decoded and the varying low frequency data signals will be indicative of the parameters being transmitted and displayed in fig2 the intermediate frequency signal enters the downhole instrument 16 by way of conductors 15a and 15b the intermediate frequency signal passes through the capacitor 40 which is used to prevent the high voltage ac from entering the dip electronics and through the primary of transformer 41 the intermediate frequency signal then passes through the tuned filter using transformer 42 and capacitor 45 to the power supply circuit 46 in the power supply circuit the intermediate frequency signal is converted to dc voltages that can power parameter sensor oscillators 47 and the f m transmitter 44 through conductors 47b and 47a respectively the low frequency data signals from 47 modulate the high frequency carrier generated by the f m transmitter 44 the high frequency f m signal then passes through capacitor 40 to the motor power conductor 10 by conductor 15a the high frequency f m signal passes through the motor power conductor 10 and ground 3 to the instrument coupler 17 the high frequency f m signal passes through capacitance 18 and transformer 20 where it is applied to conductors 19a and 21a the high frequency f m signal then passes through the filter comprised of capacitor.