RWY INCURSION BY A ROTARY WINGED TFC PLT ON AN AIR TAXI MANEUVER HAS AN NMAC WITH ANOTHER GA ACFT WHO WAS ON TKOF FROM RWY 31 AT DVO; CA.

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I RETURNED FROM AN AFTERNOON HELI FLT TO LAND AT MY ARPT; DVO; AT NOVAT O; CA. I GOT THE AWOS A FEW MI OUT AND WHEN CLOSER; ANNOUNCED THAT I WOULD BE LNDG AT THE HELI LNDG PAD (ON THE E SIDE OF THE RWY). I LANDED; REMAINING IN A HOVER; AND WAS SATISFIED THAT EVERYTHING SEEMED TO BE NORMAL AT THE ARPT. MY INTENTION WAS TO CROSS THE RWY AT ABOUT 100-200 FT ALT AND PROCEED TO THE W SIDE OF THE FIELD (WHERE MY HANGAR WAS LOCATED). I DID NOT NOTICE ANY RADIO CALLS OR ANY OTHER ACFT ACTIVITY AT THAT TIME; ALTHOUGH THERE HAD BEEN REGULAR ACTIVITY THROUGHOUT THE AFTERNOON. I MADE MY RADIO CALL AND SCANNED THE ARPT. I TOOK OFF AND WAS SOON SURPRISED TO SEE A SINGLE ENG LOW WING AIRPLANE CROSS MY FLT PATH IN FRONT OF ME; FROM N TO S (R TO L). WE MISSED EACH OTHER BY SOME 200 FT. WHILE I WAS SURPRISED; I WAS NOT ALARMED; SINCE IT WAS CLR THAT THERE WAS NO DANGER OF COLLISION. I DID NOT ATTEMPT ANY EVASIVE ACTION. HOWEVER; I WAS RATHER SHOCKED BY THIS EVENT; REALIZING WHAT COULD HAVE HAPPENED IF CONDITIONS HAD BEEN A LITTLE DIFFERENT. I WAS MORE CONCERNED WITH FINISHING MY FLT ACROSS THE FIELD THAN I WAS WITH TRYING TO MAKE CONTACT WITH THE OTHER ACFT. AFTER A FEW SECONDS; AN UNIDENTIFIED MALE VOICE APPEARED ON THE RADIO ASKING IF ANYONE WAS ON FREQ. I REPLIED; GAVE MY CALL SIGN AND STATED THAT I WAS PROCEEDING TO THE W SIDE OF THE FIELD. I DID NOT KNOW WHO HAD CALLED. JUST AFTER I LANDED NEAR MY HANGAR; THERE WAS ANOTHER CALL; SAYING 'THAT WAS PRETTY CLOSE.' I REPLIED; 'I AGREE WITH YOU. SORRY ABOUT THAT.' NOTHING MORE WAS HEARD. I HAD DECIDED TO APOLOGIZE INTO THE BLIND IMMEDIATELY RATHER THAN TRY TO FIGURE OUT WHAT HAPPENED OR EVEN TO THINK OF WHO MIGHT BE AT FAULT. I DO NOT KNOW WHERE THAT PLANE CAME FROM. ALTHOUGH VISIBILITY WAS EXCELLENT; THE SUN WAS BRIGHT AND LOW IN THE SKY; MAKING IT DIFFICULT TO LOOK TOWARDS THE W AND NW. IN ANY EVENT; I DID NOT SEE THE AIRPLANE ON THE GND OR GETTING INTO THE AIR. THE FACT THAT I WAS ON THE OPPOSITE END OF THE RWY DID NOT HELP. THE PLANE MAY HAVE BEEN IN THE RUNUP AREA WHEN I TOOK OFF; OR PERHAPS IT WAS EVEN TAKING OFF AT THE VERY TIME I DID. IT MAY HAVE BEEN A TOUCH-AND-GO. IT IS ALSO POSSIBLE THAT THE AIRPLANE MADE ITS DEP CALL AT EXACTLY THE SAME TIME THAT I DID; ALTHOUGH I DID NOT NOTICE ANY UNUSUAL SQUEALING 'STEPPED ON' SOUND. THE MORAL; AS USUAL; IS: CHK; DOUBLECHK; AND CHK AGAIN.