General aviation pilot reported a near miss with another aircraft during climb from a non-towered airport. The pilot maneuvered to increase the separation with the opposite direction aircraft.

Narrative

While departing Santa Paula; a non towered airport; from runway 22 and during initial climb out passing through 1200 MSL; an Aircraft Y flying at same altitude and in the opposite direction was seen at my 11 O Clock position and evidently on an extended Left Down wind pattern entry for the Santa Paula airport. I estimate my position at the time of the near miss was 1 mile West of the departure end of runway 22. Once I spotted the 11 O clock traffic; I banked my wing to the right to increase the separation with the opposite direction aircraft.Although my aircraft is ADSB Out equipped and I was broadcasting my position to other aircraft; I do not believe the Aircraft Y was ASDB equipped or in operation as no targets to the West of the airport were visible on my ADSB Stratus Receiver during my take off or initial climb out.The Santa Paula traffic pattern was very busy with numerous aircraft in the pattern; and each of them frequently reporting their position in the pattern. As such any position report made by the Aircraft Y inbound on their extended Left downwind entry to runway 22 was not heard. That coupled by the missing ADSB reporting made the traffic difficult to notice at a more comfortable distance.