drill string 10 is rotated by a typical drilling rig not shown to drive a rotary drill bit not shown to excavate a borehold through the earth while drill string 10 is being rotated substantial quantities of a suitable drilling fluid drilling mud are continuously circulated down through the drill string to cool the drill bit counter pressure formation fluids and carry earth borings to the surface as is well known in the art the mud stream flowing down through the drill string is well suited for the transmission of pressure signals to the surface at the speed of sound in the particular mud stream in accordance with the principles of the present invention data transmitting means 11 including vortex triode 12 controlled by fluidic feedback oscillator 14 is located in a segment of drill string 10 transmitter 11 serves to produce pressure signals in the drilling mud which are transmitted to the surface and decoded by suitable signal detecting and recording devices as is well known in the art transducers 15 are provided to sense such downhole conditions as pressure temperature and drill bit position information as well as various other conditions the transducers 15 produce electrical signals which are coupled to encoder 16 to produce digital hydraulic signals to control the feedback paths of fluidic oscillator 14 thereby controlling transmitter 11 hydraulic oil pressure as well as electrical power is generated by a mud powered turbine 17 this turbine 17 provides power to transducers 15 and encoder 16 turning now to fig2 there is depicted an exploded view of transmitter 11 transmitter 11 includes fluidic feedback oscillator 14 mounted on oscillator mounting section 20 first and second adapter sections 30 and 40 control manifold section 50 inlet section 60.