2 ACFT MECHS TAXIED AN ACFT ACROSS A RWY WITHOUT TWR CLRNC. RPTR HAD CONFUSED COMPANY RAMP FREQ WITH ATCT GND CTL FREQ.

Narrative

ON SAT; JULY; I ASSISTED IN REPOSITIONING ACFT FROM THE COMPANY HANGAR TO THE MAIN TERMINAL. I ASSISTED IN THE R SEAT BY USING THE RADIO. AS WE GOT UNDERWAY I CALLED THE TWR AND REQUESTED CLRNC TO TAXI TO THE GATE FROM THE HANGAR. I WAS TOLD 'CLR TO TAXI THROUGH TO GATE.' I WAS SURPRISED AT THE RESPONSE SO I REITERATED THAT ACFT WAS AT THE HANGAR WISHING TO GO TO THE GATE AND WAS GIVEN THE SAME RESPONSE 'CLRED TO GATE.' AT TAXIWAY A-3 WE TURNED L SHORT F RWY 5 AND CLRED OF TFC TO THE L AND R PROCEEDED ACROSS RWY 5. IT WAS AT THIS POINT I CHANGED SELECTIONS ON MY AUDIO PANEL AND CALLED RAMP CTL. IT WAS IN ACTUALITY THE FAA GND CTL FREQ I WAS CALLING AND UPON ADVISING THEM THAT I WAS AT THE INTXN OF BRAVO AND MICHAEL TAXIWAYS THEY ASKED ME TO STOP AND HOLD. I THEN WAS ASKED WHO CLRED ME TO CROSS RWY 5. I REPLIED; 'THE TWR.' UPON CHKING AGAIN I THEN REALIZED THAT I TUNED THE PROPER RADIO FREQS (THE COMPANY FREQ THEN FAA/ATC GND). WE WERE THEN CLRED TO TAXI ON TO GATE AND ASKED TO CALL THE TWR UPON ARR. THIS I DID AND EXPLAINED THAT I CALLED THE COMPANY TWR OR RAMP CTL BY MISTAKE AND THEY CLRED ME TO THE GATE. I FAILED TO REMEMBER TO THEN CALL GND CTL FOR TAXI INSTRUCTIONS. THE SEQUENCE SHOULD HAVE BEEN GND CTL FOR TAXI INSTRUCTIONS. THE SEQUENCE SHOULD HAVE BEEN GND CTL FIRST; THEN RAMP. WE XED RWY 5 WITHOUT PROPER CLRNC AND I FULLY REALIZE MY WRONG DOING AND POSSIBLE CONSEQUENCES. I WOULD LIKE TO SAY HOWEVER; ALTHOUGH INCORRECT; THIS WAS NOT GROSS NEGLIGENCE ON MY PART; WE FELT WE WERE PROPERLY CLRED TO CROSS RWY 5 AND TOOK SPECIAL NOTICE THAT THERE WERE NO ACFT ON CLOSE FINAL OR ON THE RWY 5 AT ALL.