another advantage of the present invention is the ability to create a clean essentially free of noise pulse signal that is essentially independent of the fluid flow rate or pressure within the drill collar the present invention thereby allows for pulses of varying amplitudes in pressure and frequencies to increase the bit rate addition of more than one pulser assemblies would lead to an exponential increase in the data bit rate received uphole the connecting flow channels allow for equalization of the pressure drop across the pilot to be matched by the flow throttling device ftd as a servo amplifier the primary pressure change occurs between the inner middle and inner lower flow channels providing a pressure drop created by the flow throttling device restricting the annular flow through the throttle zone the pressure drop across the pilot is the only force per unit area that must be overcome to engage or disengage the pilot from the seated position and effect a pulse this pressure drop across a minimal cross sectional area of the pilot ensures that only a small force is required to provide a pulse in the larger flow area of the ftd while the present invention has been described herein with reference to a specific exemplary embodiment thereof it will be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention as set forth in the appended claims the specification and drawings included herein are accordingly to be regarded in an illustrative rather than in a restrictive sense magnetic coupling alleviates the concern for a rotary seal.