MD80. ZHU HAD RADIO FAILURE. TCASII RA WAS EXPERIENCED.

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LOST COM; SUBSEQUENT TCASII RA. WX WAS CLR AND BETTER THAN 10 SM. AT 6000 FT MSL; 210 KIAS 25 MI W OF CWK; LOST COMS WITH ZHU ON FREQ 132.4. MULTIPLE ATTEMPTS WERE MADE TO RE-ESTABLISH COM WITH CTR. WE HEARD ANOTHER ACFT TRYING TO RAISE CTR AS WELL; AND DETERMINED THAT THEY WERE HAVING PROBS WITH THEIR RADIOS. AT 5 MI W OF CWK; SWITCHED TO AUS TWR ON 121.0. THEY IMMEDIATELY CLRED US TO LAND ON RWY 17R. AS WE MADE A R TURN AND BEGAN OUR DSCNT; TWR CALLED OUT TFC LOW AND TO OUR R. WE CALLED TFC IN SIGHT. AT ABOUT 5500 FT MSL; WE RECEIVED A TEMPORARY TCASII RA TO CLB. AS WE BEGAN TO LEVEL; THE TCASII WENT TO MONITOR VERT SPD. WHEN CLR OF CONFLICT; WE PROCEEDED TO LAND WITHOUT FURTHER INCIDENT. ONCE ON THE GND; WE ASKED AUS TWR TO CALL ZHU TO VERIFY THAT THERE HAD BEEN NO TFC CONFLICTS. TWR LATER REPLIED THAT ZHU RPTED NO TFC CONFLICTS AND THAT THE PROB MUST BE WITH OUR RADIO. WE BELIEVE THAT OUR RADIO WAS WORKING PROPERLY; AS WE HAD NO OTHER PROBS WITH IT ON ANY OTHER FREQ. WE BELIEVE THAT THE PROB MIGHT BE WITH ZHU'S RADIO FREQ; GIVEN THE FACT THAT WE HAD TO CALL THEM 4 OR 5 TIMES TO ESTABLISH INITIAL RADIO CONTACT. ALSO DUE TO THE FACT THAT WE HEARD OTHER ACFT HAVING DIFFICULTY TRYING TO ESTABLISH RADIO CONTACT.