UNAUTH RWY ENTRY OP TKOF CREATES A POTENTIAL CONFLICT WITH ARR TFC. UNAUTH PENETRATION OF AIRSPACE. PROX OF ATA.

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HOW THE PROBLEM AROSE. I DID NOT GET APPROPRIATE CLRNC FROM A TEMPORARY TWR BEFORE TAKING OFF. THIS INCIDENT OCCURRED AFTER GETTING CLRNC TO TAXI. CONTRIBUTING FACTORS. I WAS NOT IN THE HABIT OF TALKING TO A TWR OR GND CTL AT PALMER MUNICIPAL ARPT WHICH NORMALLY DOES NOT HAVE AN OPERATING TWR OR GND CTL. I WAS DIRECTED TO TAXI ON A RWY TO ANOTHER RWY INTXN FROM THE HOLD SHORT LINES AND OTHER PROMPTING SIGNS WERE NOT PRESENT. I WAS ALSO LARGELY UNFAMILIAR WITH THE ARPT. I HAD LANDED AND TAKEN OFF FROM THE MAIN RWY BUT DIDN'T KNOW MY WAY AROUND ME WHICH WAS DISTRACTING. PERCEPTIONS; JUDGEMENTS; DECISIONS. WHEN I TAXIED TO THE RWY INTXN; I FOUND MYSELF ON THE ACTIVE RWY. AT THIS POINT; I FORGOT TO CONTACT THE TEMPORARY TWR. PROCS WERE NOT 'NORMAL' AND MY ACTION WAS TO TKOF. I DIDN'T REALIZE WHAT I HAD DONE UNTIL 'TEMPORARY GND CTL' ASKED ME WHETHER I HAD TAKEN OFF. AT THIS POINT CONFIRMED THAT I HAD AND IMMEDIATELY SWITCHED TO THE 'TEMPORARY TWR' FREQ AND RPTED MY POS. THE 'TEMPORARY TWR' RPTED POTENTIALLY CONFLICTING TFC AND I RPTED WHEN I HAD THE TFC IN SIGHT. ACTIONS AND INACTIONS. I TOOK OFF WITHOUT PROPER TWR CLRNC BUT CONTACTED THE 'TWR' AS SOON AS I REALIZED MY MISTAKE. FACTORS AFFECTING HUMAN PERFORMANCE. UNUSUAL PROCS; UNFAMILIAR ARPT; APPREHENSION ABOUT WX CONDITIONS.