C152 INSTRUCTOR AND STUDENT; AT AN UNCTLED ARPT; OBSERVE C172 ACFT ENTER THE LNDG PATTERN IN OPPOSITE DIRECTION FROM TFC FLOW AND TAKE EVASIVE ACTION TO PREVENT AN AIRBORNE CONFLICT.

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UPON CALLING UNICOM; WE WERE ADVISED RWY 19 WAS ACTIVE EVEN THOUGH THE WINDS WERE FROM THE N. THERE WAS ANOTHER ACFT IN THE PATTERN; SO WE JOINED THE 45 DEG DOWNWIND FOR RWY 19. AFTER A FEW TOUCH-AND-GOES; WE NOTICED ANOTHER ACFT APCHING THE ARPT ON THE 45 DEG FOR RWY 1. WE WERE ABEAM THE NUMBERS ON DOWNWIND WHEN WE SAW THE OTHER ACFT OFF OUR R WING. THEY WERE HDG RIGHT TOWARDS US. WE CONTINUED OUR DSCNT AND TURNED AN EARLY BASE. THE OTHER ACFT TURNED L AND JOINED THE DOWNWIND FOR THE OPPOSITE RWY. WE TURNED FINAL AND MADE APPROPRIATE RADIO ANNOUNCEMENTS; NEVER HEARING THE OTHER ACFT ON FREQ. UPON LNDG; WE NOTICED THE OTHER ACFT TURNING FINAL. WE EXPEDITED OFF THE RWY AND TAXIED TO PARKING. AFTER LNDG THE OTHER ACFT ALSO TAXIED TO PARKING. I APCHED THE OTHER ACFT AFTER ENG SHUTDOWN TO ASK A FEW QUESTIONS. THERE WAS JUST 1 PLT IN THE ACFT. I ASKED IF HE WAS ON FREQ OR IF HE SAW US AT ALL. HE SAID HE SAW ANOTHER ACFT 'WIZZ' BY WHEN HE WAS JOINING DOWNWIND. HE WANTED TO CHK HIS RADIOS TO MAKE SURE HE WAS ON THE RIGHT FREQ. HE HAD TUNED IN 123.50 INSTEAD OF 123.05. HE HAD GOTTEN THE WX ON AWOS AND ASSUMED RWY 1 WAS ACTIVE SINCE THAT FAVORED THE WINDS. HE THEN REALIZED HIS MISTAKE AND APOLOGIZED.