ATC EQUIP PROB; TWR DOES SEEM TO RESPOND TO PLT COM. WEAK ATC XMISSIONS.

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WHEN 7-8 MI OUT (W OF BED) HAVING JUST PASSED OVER 6B6; I MADE RADIO CONTACT WITH BED TWR. I WAS ACKNOWLEDGED AND WAS ASKED TO MAKE REQUEST. I REPLIED I WAS INBOUND WITH ATIS AND WHEN I DID NOT HEAR A REPLY AS I APCHED THE ATA; I MADE A R 360 AND CONTINUED TO CALL 3 TIMES AND SWITCHED TO ANOTHER RADIO AND CALLED 2 MORE TIMES AND FINALLY HEARD A REPLY WHEN AT SUCH TIME I INDICATED THAT I HAD SWITCHED TO ANOTHER RADIO EVEN THOUGH I HAD BEEN FLYING ALL DAY AND HAD NO PREVIOUS PROB WITH THE RADIO UP TO RUT AND BACK WITH 2 STOPS EACH WAY; ETC. I COMPLETED THE 360 AND WAS AGAIN 7-8 MI OUT WHEN I GOT THE SECOND REPLY AND I WAS TOLD THAT IT WASN'T MY RADIO; THAT THEY WERE USING A RADIO THAT WAS PRETTY WEAK. (I WASN'T TOLD WHY?) AT THAT TIME; I WAS TOLD TO RPT A 2 MI FINAL TO 11 AND I ACKNOWLEDGED. BED TWR ALSO TOLD ME THAT THEY HAD HEARD ME XMITTING EACH TIME EVEN THOUGH I DIDN'T HEAR THEM; THEY HEARD ME EACH TIME. I PROCEEDED AND WHEN I WAS 2 MI OUT; I CALLED 3 TIMES TO RPT I WAS ON FINAL AND GOT NO REPLY AND I LOOKED TO MY L AND SAW ANOTHER ACFT AT MY ALT APPEARING TO ALSO BE ON FINAL FOR 11 ABOUT 1/2 TO 3/4 MI OFF MY L WING. I WAS ABOUT TO INITIATE A R 360 WHEN THE OTHER ACFT BEGAN A L TURN; OBVIOUSLY HAVING SEEN ME ON FINAL ABREAST OF HIS ACFT. I COMPLETED MY LNDG AND WHEN I TURNED OFF THE ACTIVE I TUNED INTO GND FREQ FOR CLRNC TO TAXI AND MENTIONED THE OTHER ACFT TO THE GND CTLR. HE GAVE ME CLRNC TO TAXI AND PROCEEDED TO TELL ME THAT I AM SUPPOSED TO CONTACT TWR BEFORE I ENTER THE ATA; TO WHICH I REPLIED THAT TWR NOT ONLY GOT MY XMISSION 7 MI OUT BUT ALSO GAVE ME CLRNC TO PROCEED AND TO RPT A 2 MI FINAL TO 11. I ALSO TOLD GND THAT TWR TOLD ME THAT THEY HEARD EACH OF MY NUMEROUS CALLS AND THAT I HADN'T HEARD THEIR REPLIES MOST OF THE TIME DUE TO THEIR USING A WEAK RADIO. NOTHING FURTHER WAS SAID AND I TAXIED TO W RAMP; PARKED; AND TIED DOWN.