TB20 PLT ATTRIBUTES TEMPORARY LOSS OF NAV EQUIP TO HIGH PWR RADIATION SOURCE BTWN LVK AND REIGA (NDB).

Narrative

I FLEW OUT OF LIVERMORE AND FILED IFR. I WAS ON THE ASSIGNED BYRON 1 DEP HEADING FOR THE FIRST WAYPOINT; WHICH WAS ALSO THE NDB (REIGA) WHEN EVERYTHING WENT WRONG. I HAD STATION PASSAGE; TURNED TO 030 DEGS; AND THE DEP CTLR ASKED ME WHY I WAS DOING SO. I TOLD HIM (AFTER VERY QUICKLY DOUBLECHKING THE DEP PAGE) THAT I WAS RIGHT ON COURSE; ETC; AND HE SAID I WAS REALLY SCREWING UP (OTHER WORDS THAN THAT BUT SAME MEANING). I WAS VERY PERPLEXED TO SAY THE LEAST. I LOOKED AGAIN AT MY ADF AND IT WAS NOW SHOWING IT SORT OF OFF MY R INSTEAD OF BEHIND ME AS IT SHOULD HAVE BEEN. I TURNED BACK TO THE NDB. THEN I LOOKED AT THE COMPASS -- IT WAS SPINNING AROUND AS IF DRIVEN BY A 100-200 RPM MOTOR. IN THE PAST; I HAD SEEN THAT HAPPEN BEFORE. AS I PASSED WITHIN ABOUT 1/4 MI OF A 50000 WATT AM RADIO STATION IN IDAHO; IT HAD SENT THE COMPASS SPINNING UNCTLABLY FOR NEARLY 3 MINS. IT TOOK OVER 5 MINS FOR IT TO STOP SPINNING THIS TIME AND THE NDB REQUIRED ABOUT 5 NM TO RESPOND CORRECTLY. EVEN THE VOR AND RNAV (KNS-81) WERE SOMEWHAT AFFECTED AND THEIR READINGS WERE NOT RELIABLE. IT THREW ALL MY HDGS OFF. I COULD NOT RESET THE GYRO FOR NEARLY 15 MINS. WHATEVER HIGH PWR RADIATION IS IN THAT AREA WAS FAIRLY CLOSE TO LVK; BUT NOT OUT AS FAR AS THE NDB.