FLC OF AN LTT FAILED TO STOP SHORT OF A TXWY AS CLRED TO TAXI FOR TKOF.

Narrative

BECAUSE OF A DELAY IN GETTING GND PWR; I DID NOT GET ATIS OR OUR CLRNC UNTIL AFTER ENG START. WHILE I WAS DOING THIS THE CAPT USED THE #1 (COMPANY) RADIO TO GET TAXI CLRNC. THE CLRNC WAS TO TAXI TO RWY 21; HOLD SHORT AT A. A IS THE PARALLEL TXWY FOR RWY 21. AS WE WERE TAXIING I CHANGED #2 RADIO FROM CLRNC DELIVERY TO WHAT I THOUGHT WAS ON THE #1 RADIO. THEN I CHANGED #1 RADIO BACK TO COMPANY FREQ. AS IT TURNS OUT I DID NOT HAVE THE PROPER GND FREQ IN THE #2 RADIO. WHEN WE GOT TO TXWY A WE DID NOT HOLD SHORT AND CONTINUED TO TAXI TO RWY 21. WE DISCOVERED WE WERE ON THE WRONG FREQ BEFORE REACHING RWY 21 AND I CALLED GND CTL. THERE WERE NO TFC CONFLICTS OR ANY PROBS BECAUSE WE DIDN'T HOLD SHORT AT A; AND I'M NOT SURE WHY WE WERE TOLD TO HOLD SHORT. APPARENTLY ANY XING TFC HAD ALREADY PASSED AND WAS GONE. THE CAPT AND I DISCUSSED THIS AND DECIDED THAT WE SHOULD HAVE DONE EVERYTHING IN THE NORMAL WAY INSTEAD OF TRYING TO HURRY THINGS BY USING 2 RADIOS. THAT WAY 2 PEOPLE WOULD HAVE HEARD THE CLRNC WITHOUT BEING DISTR BY THE OTHER RADIO WITH THE CLRNC DELIVERY.