NMAC BTWN PIPER PA28 5 MI FROM GFK. RPTR CLBING THROUGH 3000 FT AND THE OTHER DSNDING. RPTR TOOK EVASIVE ACTION AND APCH CTLR ISSUED ADVISORY JUST AFTER THE ACFT PASSED.

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I WAS ON CLBOUT IN A PIPER ARROW FROM GFK (DEPARTED RWY 35R) CLBING THROUGH APPROX 3000 FT MSL WITH MY FLT INSTRUCTOR (NOT FLYING) ROUGHLY HEADING 080 DEGS UNDER RADAR SVCS WITH GRAND FORKS DEP; WHEN MY INSTRUCTOR NOTICED TFC; A PIPER WARRIOR ON A DSCNT OFF OUR 10 O'CLOCK POS ROUGHLY 100 FT ABOVE US HEADING ROUGHLY 180 DEGS. I LEVELED OFF THE ACFT; READY TO DSND WHILE WATCHING THE TFC; WHICH APPEARED TO BE IN LEVEL FLT AT THE TIME. WE WERE ABLE TO KEEP WELL BELOW THE TFC; SINCE THERE WAS NOT ENOUGH TIME FOR CHANGING HEADING TO AVOID THE TFC. ABOUT 1/2 MIN AFTER PASSING THE TFC; DEP CTL ADVISED US WE HAD TFC OFF OUR 3 O'CLOCK POS SBOUND. THIS WAS WELL AFTER THE TFC PASSED US OVERHEAD; WHICH I HAD LOST SIGHT OF AFTER THE PASSING. I CHKED MY 3 O'CLOCK POS AND ADVISED DEP CTL THAT I WAS LOOKING FOR THE TFC. I NEVER HEARD ANYTHING ABOUT THE TFC SINCE THEN. I BELIEVE THE CONTRIBUTING FACTOR WAS LACK OF EXPERIENCE ON THE CTLR'S PART. THE CTLR SOUNDED NEW ON THE RADIO; SOMEWHAT STUMBLING AND LOOKING FOR THE CORRECT TERMINOLOGY. I GATHER THAT THE CTLR WAS IN TRAINING. ALSO; I VARIED FROM THE LCL CLBOUT PROC WITH OUR FLT SCHOOL; WHICH IS TO CLB RWY HEADING (354 DEGS THAT DAY) UNTIL 2500 FT MSL; THEN TURN 30 DEGS ON COURSE; THEN AT 3500 FT MSL; TURN TO DEP HEADING.