POSSIBLE DC ADIZ RULES VIOLATION OF A C1 COLONIAL SKIMMER AMPHIBIAN PLT AFTER A DEP FROM MTN; MD.

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WHEN I RETURNED FROM A LCL FLT; THE TWR ADVISED THAT POTOMAC RADAR WANTED ME TO TELEPHONE. I LOCKED UP THE PLANE AND WENT TO THE FBO AND WAS GIVEN THE PHONE NUMBER FOR POTOMAC RADAR. AFTER SEVERAL MINS OF BEEP BEEPS; AND NO RESPONSE FROM A LIVING PERSON; I HUNG UP THE PHONE BECAUSE I HAD AN APPOINTMENT. I HAVE ABSOLUTELY NO IDEA WHAT POTOMAC APCH COULD HAVE WANTED. I FOLLOWED ALL THE RULES AND REGS FOR THE FLT. I FILED AN ADIZ NBOUND FLT PLAN WITH FSS PRIOR TO LEAVING FOR THE ARPT. MY ACFT IS A C1 COLONIAL SKIMMER AMPHIBIAN. AT MARTIN; I WAS CLRED BY MTN TWR TO DEPART ON RWY 15 WITH A L DOWNWIND DEP FOR MY NORTHERLY COURSE TO LAKE ELDRED. WHILE ON THE DOWNWIND; MARTIN TWR ADVISED THEY WERE NOT RECEIVING MY ASSIGNED SQUAWK. I REPLIED THAT I WOULD STAY IN THE PATTERN AND LAND. TWR SAID SOMETHING TO THE EFFECT THAT I COULDN'T DO THAT (WHY I DON'T KNOW). THEN; TWR ADVISED THAT POTOMAC RADAR WAS RECEIVING MY XPONDER AND TO PROCEED ON COURSE AS FILED -- WHICH I DID. AFTER A FEW MINS; I REQUESTED A FREQ CHANGE TO POTOMAC. I TRIED TO REACH POTOMAC 4 OR 5 TIMES TO NO AVAIL. THEY WERE VERY BUSY. (POTOMAC WAS HANDLING ANOTHER ACFT WITH A SIMILAR SUFFIX AT THE SAME TIME WHICH MIGHT HAVE CAUSED SOME CONFUSION.) WHEN MY GPS SHOWED I HAD DEPARTED THE ADIZ; I GAVE UP ON POTOMAC. THE ACFT JUST RETURNED FROM ITS ANNUAL INSPECTION. THERE HAD BEEN PROBS WITH AN OIL LEAK; THE RETRACTABLE LNDG GEAR SYS AND THE XPONDER WHICH WAS REBUILT. I HAVE BEEN FLYING SMALL ACFT FOR OVER 50 YRS AND HAVE NEVER HAD ANY PROBS WITH THE MACHINES OR ATC; UNTIL NOW.