RPTR ERROR ADMITTED IN ALTDEV ALT OVERSHOT AND HDG? TRACK DEV.

Narrative

I WAS ON A PLEASURE FLT FROM 2R9-PEZ-SAT-2R9 IN A CESSNA 172. I MADE A TOUCH AND GO AT PEZ AND MY PLAN WAS TO ENTER THE CLASS C AIRSPACE AND DO 1 TOUCH AND GO AT SAT THEN RETURN TO 2R9. I CONTACTED SAT APCH AND THEY GAVE ME VECTORS TO SAT AND CLRED ME FOR TOUCH AND GO 12R. AFTER PERFORMING THIS MANEUVER THEY INSTRUCTED ME TO MAKE CLOSE IN R TFC. I HAD ONLY WANTED TO PERFORM 1 TOUCH AND GO AND THEN RETURN TO 2R9 (HDG APPROX 140 DEGS) AND I THOUGHT THAT WHILE ON A R DOWNWIND FOR 12R THE TWR WAS GOING TO HAND ME OFF TO DEP CTL AND THEY WOULD VECTOR ME TOWARD 2R9. HOWEVER THE TWR CLRED ME TO LAND RWY 12R (AGAIN) (TOUCH AND GO). THE TPA IS 1800 FT MSL; BUT BY THAT TIME I WAS AT APPROX 2000 FT MSL. I MADE A R CLOSE IN BASE FOR 12 R AND LANDED ON RWY 12R AS THE TWR CHANGED THE CLRNC FOR A FULL STOP LNDG ON RWY 12R AND TO HOLD SHORT OF RWY 3 FOR DEPARTING TFC ON RWY 3. I REQUESTED TO THE TWR TO RETURN TO RWY 2R9 (WHILE STATIONARY ON RWY 12R) AFTER DEP. I RECEIVED CLRNC TO TAKE OFF ON RWY 12R AND THEN FLY HDG 150 DEGS. I TOOK OFF FROM RWY 12R AND TURNED TO HDG 150 DEGS. AT THAT TIME THE TWR INSTRUCTED ME TO CONTACT DEP. THEY HAD NOT PREVIOUSLY GIVEN ME THE DEP FREQ (NO FREQ GIVEN); SO I ASSUMED THAT THEY WERE TALKING ABOUT THE APCH DEP FREQ THAT I WAS ON WHEN APCHING SAT. I REPEATED THE ORDER TO THE SAT TWR; CESSNA...CONTACT DEP ON 125.7. THEY TOLD ME A DIFFERENT DEP FREQ AT THAT TIME AND WHILE TURNING THE COM RADIO TO THIS DIFFERENT FREQ MY HDG WANDERED MOMENTARILY TO APPROX 175 DEGS (APPROX 5 SECONDS). UPON SEEING THIS VARIANCE I IMMEDIATELY RETURNED TO 150 DEGS AND CONTACTED DEP CTL ON THE CORRECT FREQ. I SHOULD HAVE; IN RETROSPECT; ASKED APCH CTL AND THE TWR THAT I WANTED TO MAKE 1 TOUCH AND GO LNDG AND TO IMMEDIATELY RETURN TO RWY 2R9 AFTER TKOF IF POSSIBLE -- RATHER THAN REQUESTING A TOUCH AND GO WHICH MAY HAVE GIVEN THE IMPRESSION THAT I WANTED TO DO MORE THAN 1 TOUCH AND GO AND TO REMAIN IN THE TFC PATTERN. I SHOULD HAVE ALSO MAINTAINED MY HDGS AND ALT EXACTLY ALTHOUGH I BECAME PREOCCUPIED WITH ENTERING THE NEW DEP FREQ. THERE WAS NEVER ANY CONFLICT WITH ANY OTHER ACFT AND I DO NOT KNOW IF THE TWR OR DEP EVEN NOTICED THE ALT 200 FT ABOVE TPA OR THE MOMENTARILY INCORRECT DEP HDG WHILE TURNING THE RADIO TO THE DEP FREQ; HOWEVER IN THE FUTURE I WILL MAKE MY REQUESTS MORE SPECIFIC AND HOLD HDGS -- ALTS WITH MORE PRECISENESS.