PLT OF AN SMA SEL COMPLAINED THAT ANOTHER ACFT CAME UP ALONGSIDE TOO CLOSE IN OBSERVING HIS ACFT IDENT N NUMBER.

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I WAS RETURNING S DOWN THE FARMINGTON RIVER VALLEY AT 1800 FT (BELOW BDL CLASS 'C' AIRSPACE); 8.5 MI W OF BDL; BY DME; GPS. I WATCHED A CESSNA 310 APCH MY PORT-REAR QUARTER. THEY CAME FROM BDL CTLED SPACE AT 90 DEGS; THEN FLEW ADJACENT IN FORMATION; GETTING CLOSER AND CLOSER OBVIOUSLY LOOKING ME OVER. FINALLY; I DOVE DOWN TO AVOID A COLLISION. I FELT BDL VECTORED THIS PLANE TO ME AS IT APCHED FROM THEIR AREA; THEN RETURNED. ADDITIONALLY; WHEN I LANDED AT HARTFORD; THE TWR OPERATOR INFORMED ME THAT BRADLEY HAS TRACKED ME FROM NW AND I WAS FLYING 'ERRATICALLY.' SINCE I HAD A TV CAMERA MAN AS A WITNESS; I VOLUNTARILY CALLED BDL TWR AND EXPLAINED THAT I FLEW STRAIGHT UP THE FARMINGTON VALLEY; MADE 1 CIRCLE 18 MI NW OF BDL; THEN STRAIGHT S BACK TO HFD. THE NEAREST I WAS TO BDL WAS 8.5 MI BUT WAS BELOW THEIR AIRSPACE. WHEN THEY HEARD I HAD A WITNESS THEY DENIED ANY KNOWLEDGE OF PROB! THE NEXT DAY I HAD MY ALT ENCODING SYS RECERTIFIED. IT NOT ONLY PASSED REQUIREMENTS; BUT THE AVIONICS SHOP STATED IT WAS FINE BEFORE RECERTIFICATION. I FEEL; BECAUSE I WAS NEAR BUT BELOW BDL AIRSPACE; THEY REQUESTED THE CESSNA 310 TO CHK ME OUT. BECAUSE MY ACFT HAS SMALL NUMBERS THE OVERZEALOUS 310 PLT FLEW TOO CLOSE TO ME. WHEN CONFRONTED; BDL DENIED ANY PROB WHEN I TOLD THEM I HAD A VIABLE WITNESS.