PA12 LNDG RHV EXPERIENCED NMAC WITH CESSNA.

Narrative

I WAS INBOUND TO RHV FROM LVK AT ABOUT XA45 ON APR/SAT/03; AND RPTED INBOUND OVER CALAVERAS RESERVOIR; WHICH IS STANDARD PROC WHEN ARRIVING FROM THE N. THE TWR ACKNOWLEDGED MY POS AND TOLD ME TO RPT ON A 2 MI 45 DEG ENTRY FOR R TFC TO RWY 31R. I HAD MY XPONDER ON 1200; AND IT WAS SET TO ALT RPT; AND HAD MY LNDG LIGHT AND STROBES TURNED ON. WHEN I WAS 2 NM OUT (BASED ON MY GPS); I CALLED THE TWR WITH MY POS; BUT THE TWR DID NOT ACKNOWLEDGE MY POS RPT. ABOUT 10 SECONDS LATER; I SAW A GREEN CESSNA COMING STRAIGHT AT ME; ONLY A LITTLE BELOW MY ALT AND CLBING NOSE HIGH. THE CESSNA WAS BELOW MY HORIZON HIDDEN BY THE BACKGND CLUTTER; AND PROBABLY WAS LESS THAN 300 FT AWAY FROM ME. I IMMEDIATELY BANKED HARD TO THE L AND PUSHED THE NOSE DOWN USING ALL THE CTL MOVEMENT POSSIBLE. THE CESSNA PASSED JUST ABOVE AND TO THE R OF MY PLANE. AFTER REGAINING MY COMPOSURE; I CALLED THE TWR AND RPTED THAT I WAS NOW 1 1/2 MI OUT ON THE 45 DEG FOR RWY 31R. THE TWR REPLIED TO ME 'ACFT X STAND BY.' THE NEXT COM; AS I RECALL; WAS WHEN I RPTED DOWNWIND FOR RWY 31R. THE LNDG WENT SMOOTHLY WITHOUT ANY PROBS. NEVER DURING MY APCH DID THE TWR INFORM ME OF ANY TFC COMING MY DIRECTION; NOR DO I RECALL THE TWR INFORM ANY DEPARTING CESSNA THAT THERE WAS A PIPER CUB INBOUND FROM THE N. I BELIEVE THE TWR'S RADAR WAS WORKING AT THE TIME; BASED ON A XMISSION I HEARD REGARDING ANOTHER PLANE'S LOCATION. THERE WAS RELATIVELY LITTLE ACFT ACTIVITY AT THIS TIME OF THE MORNING. REID HILLVIEW BECOMES VERY BUSY LATER IN THE MORNING. I FEEL THE TWR SHOULD HAVE INFORMED ME AND THE CESSNA OF EACH OTHER'S POS; BECAUSE WE WERE WELL INSIDE THEIR AIRSPACE; THEY WERE NOT VERY BUSY; AND THEY HAD RADAR.