What was found
AFTER TAKEOFF PILOT NOTICED SMELL OF SMOKE. PILOT ASKED COPILOT TO CONFIRM WHICH HE DID. NO SMOKE INDICATION OCCURRED. COPILOT CHECKED CARGO COMPARTMENT AND NOTICED WHITE SMOKE. SMELL OF SMOKE WAS STILL PRESENT. FLIGHT CREW DECLARED AND EMERGENCY AND RETURNED TO DHN. DURING DESCENT THE FLIGHT CREW NOTICED THE SMOKE HAD DISSIPATED. AFTER LANDING THERE WAS NO EVIDENCE OF SMOKE PRESENT. MAINTENANCE FOUND A WEATHER RADAR TRANSCEIVER INOP AND FAINT BURNT SMELL. APPARENTLY SMOKE WAS CONDENSATION, NOT SMOKE.