ablation catheter system in accordance with the present invention the system includes a catheter 10 having a shaft portion 12 a control handle 14 and a connector portion 16 a controller 8 is connected to connector portion 16 via cable 6 ablation energy generator 4 may be connected to controller 8 via cable 3 a recording device 2 may be connected to controller 8 via cable 1 when used in an ablation application controller 8 is used to control ablation energy provided by ablation energy generator 4 to catheter 10 when used in a mapping application controller 8 is used to process signals coming from catheter 10 and to provide these signals to recording device 2 although illustrated as separate devices recording device 2 ablation energy generator 4 and controller 8 could be incorporated into a single device in one embodiment controller 8 may be a quadrapulse rf controller u2122 device available from cr bard inc murray hill n j in this description various aspects and features of the present invention will be described the various features of the invention are discussed separately for clarity one skilled in the art will appreciate that the features may be selectively combined in a device depending upon the particular application furthermore any of the various features may be incorporated in a catheter and associated method of use for either mapping or ablation procedures reference is now made to fig2 7 which figures illustrate one embodiment of the present invention the present invention generally includes a catheter and method of its use for mapping and ablation in electrophysiology.