CONFLICT BTWN 2 SMA SEL ACFT IN A NON CTLED TFC PATTERN.

Narrative

WAS FLYING PIPER ARROW. I HAD APCHED 2N9 FROM RDU; AND HAD MADE RADIO CALLS 3 MI ONT; 45 DEG ENTRY; DOWNWIND; AND TURNING BASE. THERE WERE 2 OTHER ACFT ON THE FREQ AND I WAS VISUALLY WATCHING 1 OF THEM (IT WAS ON FINAL RWY 4) AND WATCHING FOR ARR OF THE 2ND ONE. I SAW AN ACFT ABOVE ME APPROX 1/2 MI AWAY AS I TURNED BASE (HE APPEARED TO BE OVERHEAD THE FIELD; AND I THOUGHT HE WAS THE ARRIVING FLT I HAD BEEN HEARING. AS I CALLED MY BASE TURN; SOMEONE (DON'T KNOW WHICH ACFT) RESPONDED AND ASKED 'CALLING BASE TURN; DO YOU SEE THE ACFT ON DOWNWIND ABOUT TO TURN BASE?' I THEN REALIZED THAT THIS WAS A 3RD ACFT; NOT THE ARR I HAD BEEN LOOKING FOR. HE WAS DOING TOUCH-AND-GOES IN PATTERN WITHOUT ANY RADIO CALLS. I RESPONDED BY SAYING THAT I WOULD EXTEND DOWNWIND; WHICH I DID; AND HE TURNED BASE INSIDE ME. BESIDES THE TFC CONFLICT; A MORE SUBTLE AND DANGEROUS THING OCCURRED. IN WATCHING THE CONFLICTING ACFT AT APPROX MY 7 O'CLOCK; I HAD BEEN DISTRACTED AND WAS SLOWLY RAISING THE NOSE WITHOUT REALIZING IT. WHEN I LOOKED BACK TO THE WINDSHIELD AND PANEL; AIRSPD HAD DECAYED UNCOMFORTABLY CLOSE TO STALL. LESSONS/SUGGESTIONS: EVEN THOUGH CAREFULLY MONITORING CTAF AND MAKING CALLS; REMEMBER THERE MAY BE NO-RADIO ACFT AROUND. KEEP THE VISUAL SCAN GOING. BE SURE THE ACFT YOU SEE IS THE ONE YOU THINK IT IS -- THOUGH I SAW THIS ACFT; I THOUGHT HE WAS OVERHEAD FOR PATTERN ENTRY; NOT ABOUT TO TURN BASE INSIDE ME. NO MATTER WHAT HAPPENS; MAINTAIN AIRSPD DESPITE DISTR. FOR THE CONFLICTING ACFT - - EVEN THOUGH NOT REQUIRED; USE RADIO IN PATTERN (THIS WAS NOT A NON-RADIO EQUIPPED PLANE).