FLC RPTS EMI INTERFERENCE BEING PRESENT BY STATIC IN HEADSETS AND RADIO ALT FLAG DISPLAYED.

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DURING CLBOUT ON FLT FROM JAX TO PHL; THE FO HAD AN OFF FLAG IN HIS RADAR ALTIMETER. AFTER LEVEL OFF; BOTH PLTS STARTED TO GET SOME STATIC IN THEIR HEADSETS. I; AS THE FO; ASKED THE A FA TO CHK FOR USE OF PERSONAL COMPUTERS AND CD'S. AT THIS TIME; WE HAD TWO PERSONAL COMPUTER IN USE AND POSSIBLY TWO CD PLAYERS. THE MAKES AND LOCATION OF THE COMPUTERS AND CD PLAYERS ARE AS FOLLOWS: SEAT 8C - CD; SEAT 8F - CD; SEAT 1A - PC; SEAT 5C - PC. WE ASKED THE A FA TO ASK THE PEOPLE WITH THE CD PLAYERS TO TURN THEM OFF. AFTER THEY TURNED THEM OFF; THE FLAG WENT OUT BUT CONTINUED TO COME ON INTERMITTENTLY. WE THOUGHT THE LAP TOP COMPUTERS MAY BE CAUSING IT TO BE INTERMITTENT IF TURNED ON AND OFF. WE HAD BOTH TURNED ON AND OFF WITH NO FLAG. BOTH WERE LEFT ON WITH NO FLAG APPEARING. IT APPEARS THAT THE FLAG CAME ON DUE STRICTLY FROM THE USE OF CD PLAYERS. THESE CD PLAYERS WERE BOTH ON WHEN THE FA INITIALLY CHKED; AND WE ASSUMED IT CAME ON INTERMITTENTLY BECAUSE ONE OF THE PAX TURNED IT BACK ON AFTER SHE ASK THEM TO TURN THEM OFF. WITH BOTH PCS ON; WE HAD THE PAX TURN ON THEIR CD'S ONE AT A TIME; SEAT 8F THEN 8C. THIS TIME NO FLAG. WE HAD 8F TURN HIS OFF. STILL NO FLAG. I FEEL THAT THE FLAG WAS ATTRIBUTED TO THE CD'S SINCE IT WENT OUT WHEN TURNED OFF.