NMAC BTWN A PIPER PA24; COMANCHE; TAKING OFF AND A CESSNA APCHING TO LAND FROM THE OPPOSITE DIRECTION AT THE CDC NON TWR ARPT. EACH ACFT MADE AN EVASIVE ACTION TURN.

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I OBSERVED A SIT AT CEDAR CITY ARPT ON OCT/MON/00; AT ABOUT XA00 LCL TIME. I ARRIVED IFR FROM OGDEN AND; AFTER REFUELING; TAXIED OUT TO DEPART IFR FOR EL MONTE; CA; IN MY COMANCHE. A MOONEY TAXIED OUT AHEAD OF ME TO DEPART. I WAS COMMUNICATING WITH THE FSS TO GET MY CLRNC. THE MOONEY ALSO TALKED TO FSS. I THEN OBSERVED THE MOONEY TAXI ONTO RWY 20 AND STOP. HE SAT THERE FOR WHAT MUST HAVE BEEN A GOOD 5 MINS; DURING WHICH A CESSNA APCHED RWY 20 FOR LNDG; AND ABORTED; FLYING UPWIND PARALLEL TO RWY 20 BECAUSE OF THE MOONEY SITTING THERE. I RECALL ASKING FSS AT THE TIME IF THEY WERE IN RADIO CONTACT WITH THE CESSNA; FORGETTING HE WAS PROBABLY ON CTAF. THE MOONEY TAXIED AND I WAITED FOR MY CLRNC; IN THE RWY 20 RUN-UP AREA. THE MOONEY THEN ASKED ON FSS IF I WAS READY TO DEPART BECAUSE HE WANTED TO TAKE OFF ON RWY 2. I SAID I WAS NOT READY TO DEPART AND WOULD HOLD FOR HIM. HE THEN TOOK OFF ON RWY 2; ONLY TO FIND HIMSELF FACE TO FACE WITH THE CESSNA; AGAIN ATTEMPTING TO LAND ON RWY 20. THE MOONEY DIVERTED TO THE R AND THE CESSNA DIVERTED AGAIN. I RECEIVED MY CLRNC; ANNOUNCED MY DEP ON FSS FREQ AND TOOK OFF ON RWY 20; ONLY TO FIND MYSELF FACE TO FACE WITH THE CESSNA COMING IN TO LAND ON RWY 2. I DIVERTED TO THE R AND DEPARTED. IN THINKING ABOUT THIS SIT; I HAVE COME TO THE REALIZATION THAT I PLAYED A ROLE IN THE WHOLE THING BY NOT ANNOUNCING MY INTENTIONS AND COMMUNICATING ABOUT MY FLT ON CTAF. THE MOONEY; LIKEWISE; DID NOT COMMUNICATE ON CTAF; TO THE BEST OF MY KNOWLEDGE; ALTHOUGH; AS I SAID; I WAS ON THE FSS FREQ. IT DAWNED ON ME THAT THE CESSNA MUST HAVE THOUGHT HE WAS DEALING WITH A FLT OF FOOLS BECAUSE NO ONE WAS TALKING TO HIM ON CTAF; WHICH HE RIGHTFULLY THOUGHT EVERYONE WOULD BE USING. SEEN FROM HIS PERSPECTIVE; HE ANNOUNCES HIS INTENTIONS ON CTAF; THEN ENCOUNTERS A PLANE; WHICH HAS SAID NOTHING; PARKED ON RWY 20. HE DIVERTS; ANNOUNCES HIS INTENTIONS ON CTAF AND ATTEMPTS TO LAND AGAIN ON RWY 20 ONLY TO FIND HIMSELF FACE TO FACE WITH THE SAME PLANE DEPARTING RWY 2; WITHOUT A WORD ON THE RADIO; SO HE HAS TO DIVERT AGAIN. HE TRIES TO LAND ON RWY 2 AFTER ANNOUNCING HIS INTENTIONS AGAIN; ONLY TO FIND HIMSELF FACE TO FACE WITH ME DEPARTING RWY 20; WITHOUT COMMUNICATING; ACCORDING TO HIS VIEW. IN MY CONCERN OVER MY IFR CLRNC AND FLT; I CLRLY FORGOT TO ANNOUNCE MY ACTIONS ON CTAF. I CAN SEE HOW THIS COULD HAPPEN TO OTHERS; AND THAT'S WHY I WANTED TO WRITE. ONE OBVIOUS SOLUTION WOULD BE FOR PERSONNEL IN FSS TO REMIND PLTS TO USE CTAF. I KNOW I AM RESPONSIBLE FOR NOT USING CTAF AND AM SORRY I DID NOT. AT THE SAME TIME; I CAN SEE IN MY SIT; HOW I COULD HAVE FORGOTTEN THE OTHER FREQ AFTER DEALING WITH FSS FOR CLRNC; THEN ANNOUNCING MY INTENTIONS AND FALSELY FEELING OK. COMPLICATING THE PICTURE; EVEN THOUGH IT'S A COMMON PHENOMENON; IS THE FACT THAT PLTS DEAL WITH ASOS; CTAF; FSS; AND UNICOM FREQS AND ENTITIES AT THAT FIELD; EACH WITH THEIR SEPARATE; AND SOMEWHAT OVERLAPPING ROLES.