ALTDEV ON CLB. FO OFF RADIOS GIVING OUT TIMES TO COMPANY. ATC ASSIGNED NEW HDG; AND CAPT THOUGHT ALSO NEW ALT.

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CLBING OUT OF STL; (CAPT LEG) WE WERE INITIALLY ASSIGNED 255 DEGS AND 3000 FT (MSL). THROUGH 2100 FT MSL WE COMPLETED THE AFTER TKOF CHKLIST. WE WERE THEN ASSIGNED A 220 DEG HDG (NO ALT). I READ BACK 220 DEGS AND TOLD THE CAPT 'I'M OFF 1.' AS PER SOP I CALLED COMPANY WITH OUR TIMES. NEXT THING I KNOW 'CHK BAROMETRIC ALT' SOUNDS OUT. THE ALT BOX SAID 3000 FT AND THE CAPT THOUGHT WHEN WE GOT THE 220 DEG HDG; WE ALSO GOT 5000 FT (WHICH IS OFTEN THE CASE). AT 3500 FT HE REDUCED PWR AND NOSED OVER. AT THE SAME INSTANT; THE CTLR SAID 'VERIFY ASSIGNED ALT.' I SAID 3000 FT. NO RESPONSE. WE LEVELED AT 3000 FT AND HEARD A 'THANK YOU.' FACTORS: THIS WAS A 14 HR DUTY DAY AND WAS OUR LAST ROUND TRIP. I WAS TIRED AND SO WAS THE CAPT. I ALSO MISSED THE 1000 FT TO GO AND 100 FT TO GO CALLOUTS AS I WAS TALKING TO COMPANY. COMMUTERS ARE ABLE TO WORK YOU INTO THE GND TO THE POINT OF SHEER EXHAUSTION. IF WE COMPLAIN; WE GO HOME WITHOUT PAY (AND IT IS NOT MUCH TO BEGIN WITH); SO WE CAN HARDLY AFFORD TO LOSE THE TRIPS.