PA28 PLT ENTERED DC ADIZ WITHOUT CLRNC OR A DISCRETE XPONDER CODE.

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THE OWNER OF THE AIRPLANE WENT FLYING. HE FILED OUR FLT PLAN AND GOT OUR CLRNC. WE CHKED IN WITH ATC AND WERE VECTORED OUT OF THE TFR ON A SOUTHERLY HDG. AFTER WE WERE OUT OF THE TFR; WE WENT ON COURSE TO SHANNON ARPT AND UP TO 2500 FT. WHEN WE WERE ABOUT TWO THIRDS THE DISTANCE TO BROOK VOR WE BEGAN HAVING TROUBLE HEARING ATC. WE HAD TO HOLD IN THE TEST BUTTON ON THE RADIO TO BREAK SQUAWK SO THAT WE COULD HEAR HIM AT ALL. FINALLY; ANOTHER ACFT RELAYED TO US TO SQUAWK 1200 AND NOT COME BACK INTO THE TFR. WE SWITCHED TO THE ADVISORY FREQ FOR SHANNON AND HAD NO TROUBLE TALKING TO THEM. I DIDN'T REALIZE; WITH ALL THE CHANGES THAT HAD TAKEN PLACE WITH THE AIRSPACE; THAT THE 30 NM RULE WAS STILL IN EFFECT. WE MADE 3 TAKE OFF LNDGS AT SHANNON AND STARTED BACK WITH IDEA THAT WE WOULD LAND AT MARYLAND ARPT; CALL ATC AND GET OUR CLRNC BACK TO PCT. WHEN WE ARRIVED AT MARYLAND; I WAS TOLD I HAD A PHONE CALL. I WAITED FOR THE PERSON BUT; IT TURNED OUT THAT NO ONE WAS THERE. VERY SHORTLY; A CUSTOMS BLACKHAWK ARRIVED AND THE PEOPLE IN IT WANTED TO KNOW THE PLT IN COMMAND OF THE P28. I TOLD THEM IT WAS ME AND THEY TOLD ME I HAD VIOLATED THE ADIZ. THEY CALLED SOMEONE AT PCT APCH AND I REPEATED MY STORY AND WAS TOLD THAT A RPT WOULD BE MADE AND I WOULD BE NOTIFIED OF ANY ACTION. THEY THEN LEFT. I HAD THE RADIO IN QUESTION TESTED RIGHT THERE AND IT WAS FINE. I WAS THEN TOLD THAT ATC'S RADIO FAILED BELOW 3000/3500 FT. WE THEN FILED TO GET HOME; GOT OUR CLRNC AND RETURNED TO PCT ARPT WITHOUT ANYMORE PROBLEMS.