CAPT OF A SWEARINGEN SA226 METRO II; CROSSED THE HOLD SHORT LINE TO THE TXWY WITHOUT CONTACTING GND CTL SINCE HE COULD NOT ESTABLISH 2-WAY COMS WITH THE TWR. HE BELIEVED THAT THERE WAS A DEAD RADIO SPOT TO THE TWR AND THAT THERE WAS NO KNOWN TFC CONFLICT.

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UPON REACHING THE ALPHA HOLD BAR OUT OF THE CARGO RAMP AT DEN; I ATTEMPTED TO REACH GND CTL. I AM A HIGH MINIMUMS CAPT; AND WAS INFORMED BY MY IOE INSTRUCTOR PLT THAT THERE IS A DEAD SPOT IN THAT AREA (RADIO RECEPTION DIFFICULT). AFTER UNSUCCESSFULLY CONTACTING GND CTL; I ATTEMPTED TO CONTACT TWR -- AGAIN; UNSUCCESSFUL. BY THE BOOK; I SHOULD HAVE SAT THERE AND AWAITED LIGHT GUN SIGNALS; HELP FROM ANOTHER ACFT COMMUNICATING; ETC. I DID NOT -- THAT WAS MY ERROR. WITH A LINE OF ACFT IN FRONT OF ME WAITING FOR DEP ON RWY 35L; I TAXIED FORWARD; HOPING TO CONTACT GND OUT OF THE DEAD SPOT. I HAD NO LUCK. I WAS ABLE TO CONTACT TWR; WHO INSTRUCTED ME TO CONTACT GND. I FINALLY DID SO AND THEY WERE OBVIOUSLY UPSET THAT I TAXIED BEYOND THE HOLD BAR WITHOUT AUTH. THERE WAS NO CHANCE OF A POTENTIAL CONFLICT WITH ANOTHER ACFT ON THE GND CAUSED BY MY ACTION TO MOVE FORWARD. I WAS SIMPLY TRYING TO ADAPT TO THE SIT AT HAND; GET OUT OF A DEAD SPOT I HAD BEEN PREVIOUSLY BRIEFED ON; AND EXPEDITE COM WITH A CTLING AUTH (WHETHER IT BE GND; TWR; OR WHOMEVER). I WAS INFORMED BY GND THAT THEY HEARD ME XMITTING; AND THAT OTHER ACFT COULD HEAR THEM (IMPLYING THAT I SHOULD BE ABLE TO AS WELL). IF IT WAS NOT A DEAD SPOT; BUT INSTEAD MY EQUIP; I HAD NO WAY OF KNOWING. I WAS SIMPLY TRYING TO RESOLVE THE PROB. I CREATED NO HAZARD AND NO POTENTIAL HAZARD; BY MY ACTION.