UNAUTH TKOF.

Narrative

ON THE AFTERNOON OF AUG/XX/94; AT DANE COUNTY ARPT; MADISON; WI; MYSELF AND 3 PAX BOARDED AZTEC TO DEPART FOR DES MOINES; IA; AROUND XX30 PM. MY PARTNER IN THE AIRPLANE HAD FLOWN IT INTO MADISON ON JUL/XX/94. WE HAD BEEN USING OUR #1 NAV COM FOR ALL OUR RADIO WORK; WHICH IS A KX165 AND OUR #2 NAV COM FOR MOSTLY NAV AND DME; WHICH IS A KX125. THE REASON FOR THIS IS THE NUMBERS ON THE FACE OF THE KX125 ARE HARD TO READ AT AN ANGLE. IN PREPARING FOR DEP; I TUNED INTO ATIS AND THEN INTO CLRNC. DELIVERY ON #1 COM; BUT DID NOT NOTICE THAT GND CTL WAS DIALED INTO #2 COM AND THE XMITTER SWITCH WAS ON #2 ALSO. I TOOK FOR GRANTED THAT I WAS TRANSMITTING AND RECEIVING ON #1 WHEN I ACTUALLY WAS TRANSMITTING ON #2 AND RECEIVING ON #1; BOTH RECEIVERS WERE ON. AFTER GETTING CLRNC DELIVERY AND GND COM I TAXIED TO RWY 31 AND TUNED TWR INTO #1 COM AND CALLED TWR AND ASSUMED THE CLRNC I HEARD WAS FOR ME AS I HAD VISUALLY CHKED FOR TFC AND COULD SEE NONE. GND CTL CAME BACK ON AND TOLD ME TO CALL TWR; BUT I HAD ALREADY TAXIED ON RWY AND BEGAN DEP. THEN I HEARD TWR TELL A PLANE TO MAKE A 360 DEG TURN. MAKING A SLIGHT BANK AND LOOKING BACK; I SAW A CESSNA ON FINAL FOR RWY 31. I CHKED MY RADIO TO VERIFY THE FREQ AND IT WAS THEN I SAW THAT MY XMITTER SWITCH WAS ON #2 COM AND I RECTIFIED ONE OF MY MISTAKES. I WAS GIVEN A PHONE NUMBER TO CALL WHEN I ARRIVED AT MY DEST; WHICH I DID AND EXPLAINED MY CONFUSING AND MISTAKE. A HOT COCKPIT AND BEING ANXIOUS TO GET SOME AIR MOVING ON MY PAX; AND BEING ACCUSTOMED TO USING THE #1 COM LED TO MY OVERSIGHT OF THE XMITTER SWITCHES. IT WILL BE ADDED TO MY CHKLIST.