FLC FAILS TO RECEIVE 2 CANCELLATIONS OF TKOF CLRNC CAUSING WHAT LCL CTLR DEEMED A CLOSE CONFLICT WITH TFC LNDG ON XING RWY.

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WHILE TAXIING OUT FOR TKOF; I FOUND THAT I WAS UNABLE TO XMIT ON THE #1 COM RADIO. THIS WAS A FAIRLY UNUSUAL SITUATION IN THAT THE #2 XMIT AND RECEIVE WAS OK; #1 RECEIVE WAS OK; AND THE CAPT HAD NO PROBLEMS ON EITHER RADIO. WE DELAYED FOR ABOUT 45 MINS WHILE MAINT FIXED THE SITUATION (THEY FINALLY REPLACED A 'REMOTE ELECTRONICS UNIT'). THE RADIO APPEARED OK AS WE STARTED TAXIING AGAIN; BUT NEAR TKOF POS; I DID BEGIN TO NOTICE MY TRANSMISSIONS GOING OUT SLIGHTLY 'CRACKLY.' WHEN CLRED FOR TKOF; I MADE A MENTAL NOTE TO TRY THE #2 RADIO ON DEP IF THERE WAS NO IMMEDIATE RESPONSE ON #1. NO SWITCHES OR FREQS WERE CHANGED; HOWEVER. SHORTLY AFTER TKOF; THE TWR CTLR ASKED 'HOW DO YOU READ?' -- LOUD AND CLR. WE CONTACTED DEP CTL AND CONTINUED THE FLT; BUT WROTE UP THE #1 COM RADIO AGAIN FOR SCRATCHY TRANSMISSIONS. WE WERE SURPRISED TO GET AN ACARS MESSAGE FROM DISPATCH SAYING THAT ANOTHER CREW HEARD OUR TKOF CLRNC CANCELLED AFTER WE STARTED TKOF ROLL -- NOT ONCE BUT TWICE! EVERYONE MISSES A CLRNC NOW AND THEN; BUT FOR 2 CREW MEMBERS TO MISS 2 IN A ROW IS VERY REMOTE. I CAN ONLY SURMISE THAT A #1 RADIO MALFUNCTION PREVENTED US FROM HEARING THE CLRNC CANCELLED. SUPPLEMENTAL INFO FROM ACN 221179: BRAND NEW MLG (FIRST REVENUE FLT).