SMA PLT ON FINAL APCH HAS NMAC WITH EMS HELI ENRTE TO AN ACCIDENT SCENE. BOTH TAKE EVASIVE ACTION. NON TWR ARPT.

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ON FINAL TO RWY 5 ZZZ APPROX 800 FT MSL (600 FT AGL); I SAW A HELI COMING STRAIGHT TOWARDS ME AT APPROX 500 FT MSL. AS I STARTED A CLBING R TURN I SAW HIM MAKE A R TURN. I CLBED TO 1200 FT MSL AND THEN MADE A CLBING L TURN TO SEE WHERE THE HELI WAS GOING. I WAS LISTENING ON CTAF AND THE HELI NEVER SAID A WORD. APPROX 2 MI SSW OF THE ARPT ON A HWY THERE WAS A BAD WRECK. THE HELI WAS AN EMS AND WAS LNDG AT THE ACCIDENT SITE. I MADE ONE 360 DEG TURN AROUND THE ACCIDENT SITE AT 1300 FT MSL. DURING THE TURN I HEARD A STUDENT PLT RPT DOWNWIND RWY 23. I THEN ENTERED DOWNWIND RWY 23 BEHIND THE STUDENT. WHEN I WAS ON FINAL RWY 23; THE ARPT MGR CAME ON CTAF AND SAID THAT THE COUNTY SHERIFF HAD CALLED AND SAID THAT I HAD INTERFERED WITH AN EMER VEHICLE. I DON'T THINK I DID ANYTHING WRONG BUT THE SHERIFF THINKS I DID. I AM GOING TO THE FAA OFFICE ON MY DAY OFF (WED) AND SEE IF THERE IS A REG THAT I VIOLATED. I THINK EMS HELIS SHOULD MAKE AN ANNOUNCEMENT ON CTAF WHEN THEY ARE GOING THROUGH AN ARPT TFC PATTERN AND ASK OTHER ACFT TO STAY CLR. IF THAT HAD HAPPENED IN THIS CASE I WOULD HAVE NOT GOT SO CLOSE TO THE HELI AND I WOULD NOT HAVE TURNED TO SEE WHERE HE WAS AND WHERE HE WAS GOING.