PLT OF A GOV SMA SEL FAILED TO CONTACT DEP CTL PRIOR TO TKOF ON AN IFR FLT PLAN DUE DISTR OF RADIO FREQ CONGESTION AND FLYING TASKS.

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AT STARTUP; I OBTAINED MY IFR CLRNC FROM CLRNC DELIVERY AT THE UNCTLED ARPT. I THEN BROADCAST ON THE CTAF AND TAXIED TO THE ACTIVE RWY. AFTER THE RUN-UP; I BROADCAST MY INTENTIONS ON THE CTAF AND DEPARTED RWY 22L INTO VMC CONDITIONS. PRIOR TO ENTERING CTLED AIRSPACE AND IMC CONDITIONS; I CONTACTED APCH CTL ON THE ASSIGNED DEP FREQ. AS APCH RESPONDED; I REALIZED THAT THE CLRNC INSTRUCTIONS HAD ADVISED TO RPT #1 FOR DEP FOR RELEASE ON THE CLRNC FREQ. I LEVELED OFF WHILE STILL OVER THE RWY IN VMC AND UNCTLED AIRSPACE WHILE APCH CLRED ME ON MY WAY. HUMAN FACTORS: THE FLT WAS THE CONTINUATION OF A SUCCESSION OF TRAINING FLTS FOR THE LAW ENFORCEMENT FLT OFFICER (THIS IS A NON-FLYING POS). THERE WERE SOME MAJOR FACTORS IN THE CHAIN OF EVENTS THAT LED UP TO THE MISSED CALL: THERE WAS CONTINUED TFC ON THE LAW ENFORCEMENT RADIOS. I WAS EXPLAINING THE NUMEROUS TASKS FOR THE FLT OFFICER WHO WAS NEW TO THE AVIATION UNIT AND HAD NO FLYING EXPERIENCE. THERE IS NO TWR AT SACRAMENTO MATHER FIELD (IT IS AN UNCTLED FIELD). I WAS THINKING VOID CLRNC TIME; EVEN THOUGH I HAD READ THE CLRNC BACK TO THE CTLR CORRECTLY. THOUGH THERE ARE MANY FACETS TO THE LAW ENFORCEMENT AVIATION CAREER; FLT SAFETY IS THE PRIMARY CONSIDERATION; AND ALL OTHER RESPONSIBILITIES ARE SECONDARY. I AM THANKFUL THAT THERE WERE NO CONFLICTS DUE TO THIS OVERSIGHT.