A CLBING C650 FLC 5 MI SW OF HIO; OR; ACCEPTS A CLRNC MEANT FOR ANOTHER ACFT WHILE THE PDX DEP CTLR IS OPERATING A SPLIT POS AT P80; OR.

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OUR DEP CLRNC WAS THE FARMINGTON 3 (FARM.3) ASF OFF OF HIO; INITIAL ALT ON DEP WAS 4000 FT. DURING CLBOUT WE MADE A L TURN TO A HDG OF 120 DEGS TO INTERCEPT THE 346 DEG RADIAL OFF OF UBG VOR AS REQUIRED BY THE SID. HIO TWR HANDED US OVER TO PORTLAND DEP. WE CHKED ON AT 3000 FT FOR 4000 FT; 120 DEG HDG TO INTERCEPT. PORTLAND ADVISED NEGATIVE MODE C AND IDENT. I RECYCLED AND IDENTED. THE CTLR WAS WORKING MULTIPLE FREQS AND ISSUED A CLRNC FOR US DIRECT TO THE UBG VOR AND UP TO 9000 FT. I READ BACK THE CLRNC WITH OUR CALL SIGN AND THE CTLR ACKNOWLEDGED OUR READBACK WITH A 'ROGER.' THE NEXT XMISSION FROM THE CTLR WAS THAT WE HAD BUSTED OUR ALT. WE LEVELED AT 6600 FT AND WE WERE CLRED BACK DOWN TO 6000 FT THEN WE WERE ISSUED NEW HDGS. I ADVISED THE CTLR OF OUR CLRNC AS WE UNDERSTOOD IT AND ACKNOWLEDGED TO HIM. THE CTLR ADVISED US WE HAD TAKEN ANOTHER ACFT'S CLRNC. DURING THE CLB WE RECEIVED A TA ON OUR TCASII. I BELIEVE IT WAS 2-3 MI AWAY. I DO NOT RECALL THE ALT OF THE OTHER ACFT OR IF THEY TOOK EVASIVE ACTION. THE CTLR THEN SWITCHED US TO HIS OTHER FREQ AND WE CONTINUED THE DEP. WITHOUT QUESTION; DURING THE DEP; NEITHER THE PF NOR MYSELF FELT THAT WE HAD MISTAKEN ANY CLRNCS FROM THE CTLR THAT WERE INTENDED FOR ANOTHER ACFT; AS WELL AS THE FACT THAT THE CTLR ACKNOWLEDGED OUR READBACKS FOR THE CLRNCS. THE CTLR WAS WORKING MORE THAN 1 FREQ AND WHETHER OR NOT ANOTHER ACFT ACKNOWLEDGED THAT XMISSION OR STEPPED ON OUR XMISSION WE WERE UNAWARE. I DO NOT KNOW WHAT WE COULD HAVE DONE DIFFERENTLY IN THIS SIT -- THE COCKPIT WAS STERILE AND WE WERE BOTH FOCUSED ON COMPLYING WITH THE DEP INSTRUCTIONS. IN THE FUTURE; I WILL BE EVEN MORE VIGILANT WHILE IN A CONGESTED TERMINAL AREA WHERE A CTLR IS WORKING MULTIPLE FREQS.