PLT FAILED TO CONTACT THE TWR; AND LANDED WITHOUT CLRNC.

Narrative

FLT FROM TYS TO PDK ARPT. UPON LEAVING ZTL I CONTACTED ATLANTA APCH. ATLANTA APCH WAS HANDLING A LOW FUEL ACFT SIT AND ASKED IF I COULD SLOW DOWN. UPON SLOWING DOWN THEY STARTED GIVING ME VECTORS; AND ALT ASSIGNMENTS. FURTHER COM WITH THE LOW FUEL ACFT RESULTED IN THEM NOT SEEING THE ARPT (BECAUSE OF HAZE); AND PLACED ON VECTORS TO FOLLOW ME. ATLANTA APCH ASKED HOW FAST COULD I MAINTAIN TILL THE MARKER. I RESPONDED WITH 190 KTS WHICH AT THIS TIME TOLD ME TO MAINTAIN 190 KTS OR BETTER. WITHIN 10 MI OF THE ARPT AND AFTER I TOLD APCH I HAD THE ARPT IN SIGHT; I WAS CLRED FOR THE VISUAL FOR RWY 20L. AT THIS TIME; HE (ATLANTA APCH) INFORMED ME OF CHEROKEE TFC AHEAD OF ME ON FINAL. I RESPONDED THAT I WAS LOOKING. AFTER PASSING (CHAMB) FINAL APCH FIX I STARTED THE PROCESS OF SLOWING DOWN AND PREPARATION FOR THE LNDG. IT WAS AT THIS TIME ABOUT 3.5 TO 4 MI ON FINAL WHEN I SPOTTED THE CHEROKEE TFC. BEFORE I COULD RESPOND TO APCH (HE) INFORMED ME THAT THE TFC WAS SHORT FINAL AND NO FACTOR. APCH DID NOT HAND ME OVER TO TWR. IF HE DID; I DID NOT HEAR HIM. ABOUT THIS TIME I HAD A PAX IN THE COPLT'S SEAT ASK ME A QUESTION ON THE ENG GAUGES. I ANSWERED HIS QUESTION AND PROCEEDED WITH FINAL PREPARATIONS FOR LNDG. AFTER LNDG AT PDX I TAXIED OFF THE RWY ONTO TXWY D AND HOLDING SHORT OF RWY 20R. I STARTED TO CONTACT TWR FOR XING INSTRUCTIONS. THIS IS WHEN I NOTICED THAT MY #1 COM WAS STILL ON APCH FREQ AND THAT I HAD NOT SWITCHED TO MY #2 COM TWR FREQ. I AT THIS TIME CONTACTED TWR AND ADVISED THEM OF MY LOC AND READY TO TAXI ACROSS RWY 20R. TWR COMMENTED; 'WE WERE WONDERING WHERE YOU WERE?' 'WHAT HAPPENED? DID APCH SWITCH YOU TOO LATE?' I WAS FLUSTERED; AT THIS POINT AND RESPONDED; 'YES THEY DID AND I AM VERY SORRY!' TWR TOLD ME TO CROSS RWY 20R AND CONTACT GND. AFTER CONTACTING GND CTL AND RECEIVING TAXI INSTRUCTIONS TO THE RAMP; GND CTL TOLD ME 'IN THE FUTURE IF APCH HAS NOT SWITCHED ME TO TWR BY 5 MI OUT; I AM TO DO SO!' 'WE COULD HAVE HAD A SIT AND COULD NOT CONTACT YOU THROUGH PROPER PROCS.' I TOLD HIM; 'I COMPLETELY UNDERSTOOD AND THIS WOULD NEVER HAPPEN AGAIN.' FACTORS THAT CONTRIBUTED TO THIS SIT WERE: FLYING AN APCH 70 KTS FASTER THAN USUAL. ALLOWING MYSELF TO GET INTO A RUSH SIT ON SHORT FINAL. ALLOWING AND ANSWERING A QUESTION FROM A PAX IN AN ARPT ENVIRONMENT. HAD MY 'MINDSET.' 'TFC ON SHORT FINAL NO FACTOR' COMMAND IS GIVEN BY THE TWR; THINKING I WAS ON TWR. OUR COMPANY (95 PERCENT OF THE TIME) FLIES 2 PLTS AND I HAD GOTTEN IN A ROUTINE OF ALLOWING THE COPLT TO HANDLE ALL COMS. ON THIS PARTICULAR TRIP I WAS FLYING THE ACFT BY MYSELF. DID NOT HAVE A GOOD NIGHT'S SLEEP. MY DAY HAD STARTED AT EARLY AM AND AT THE TIME OF THE INCIDENT HAD PUT IN A 12 HR DAY.