AN INSTRUCTOR PLT LANDED AN SMA WHEELS UP WHILE GIVING INSTRUCTION.

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ACFT OWNER OR PARTNER IN ACFT ASKED TO HAVE SOME INSTRUCTION IN THE SMA STATING IT HAD BEEN A YR OR 2 SINCE HE HAD FLOWN THE ACFT AND HE WANTED AN INSTRUCTOR TO GET HIM REFAMILIARIZED WITH THE ACFT. I WENT OVER THE PLT OPERATOR'S HANDBOOK WITH HIM FOR 'V' SPDS AND CONTINUED ON TO THE ACFT TO PRACTICE AREA IN THE ACFT FOR ABOUT 30 TO 45 MINS OF SLOW FLT; MIN CTLABLE SPD; WITH AND WITHOUT FLAPS AND WITH GEAR UP AND GEAR DOWN. HIS PERFORMANCE APPEARED SATISFACTORY AND I REQUESTED FLAPS UP AND GEAR UP. I ASKED WHAT HE FELT HE NEEDED THE MOST HELP WITH AND HE ADVISED HE NEEDED TO DO SOME RADIO WORK WITH THE CTL TWR AND APCH. HE ASKED THAT I COM FIRST WITH THE CTLRS AND WE HEADED FOR SPRINGFIELD REGIONAL ARPT. I HAD TROUBLE GETTING THE RADIO TO WORK PROPERLY APPARENTLY DUE TO AN OLD HAND MIKE THAT HAD NOT BEEN USED FOR QUITE SOME TIME. OTHER PLTS OF THE ACFT HAD A HEADSET AND PUSH- TO-TALK SWITCH THEY HAD BEEN USING. BY THE TIME I MADE RADIO CONTACT WITH APCH; WE WERE WITHIN 5 OR 6 MI OF THE ARPT AND WE WERE ADVISED TO GO TO TWR. WHILE I WAS TALKING TO TWR; WHICH I WAS HAVING TROUBLE HEARING; I WAS TRYING TO GET THE PLT TO DSND INTO PATTERN ALT SOME 1500 TO 2000 FT LOWER THAN OUR PRESENT ALT. ON DOWNWIND; I WENT THROUGH 'GUMP' AND HE ACKNOWLEDGED GAS; UNDERCARRIAGE; MIXTURE; AND PROP. I WAS UNAWARE THAT HE RAISED THE GEAR; NOT LOWERED THE GEAR. AT THAT TIME; THE GEAR HAD NEVER BEEN RAISED AFTER WORKING IN THE PRACTICE AREA. WHEN THE THROTTLE WAS RETARDED ON FINAL THE GEAR WARNING HORN WENT OFF. I CALLED OUT FINAL CHK -- GEAR DOWN. HE ACKNOWLEDGED 'GEAR LEVER DOWN; GEAR DOWN.' I LOOKED DOWN AND CONFIRMED THE SAME. NOT REMEMBERING LEVER UP IS ACTUALLY GEAR DOWN. EVERYTHING ELSE I FLY OR WORK WITH IS LEVER UP GEAR UP; LEVER DOWN IS GEAR DOWN. HOW COULD THIS HAVE BEEN AVOIDED? DO NOT ASSUME A MALFUNCTION OF THE GEAR WARNING (THAT'S WHAT IT'S FOR). DO A GAR AND GET A VISUAL CHK FROM THE TWR.