AN RHV LCL CTLR BELIEVES A STUDENT PLT'S RADIO XMITTER IS TOO LOUD AND IGNORES THE PLT'S REQUEST FOR LNDG INSTRUCTIONS.

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I AM A CFI. I WAS IN A CITABRIA 7ECA WITH A STUDENT. MY OTHER STUDENT WAS IN AN AERONCA CHAMP 7AC. I WAS DOING TKOFS AND LNDGS IN RHV CLASS D AIRSPACE; WHILE MY STUDENT IN THE CHAMP WAS ATTEMPTING TO ENTER THE AIRSPACE FROM THE S. I AND OTHER PLTS COULD HEAR MY STUDENT ATTEMPTING TO CALL THE TWR. NOT ONLY DID ANOTHER BONANZA HEAR MY STUDENT AND TRY TO RELAY THE CALL TO THE TWR; I; TOO; COULD HEAR THE CALL. HOWEVER; THE ATC CTLR WOULD NOT RESPOND TO THE CHAMP WITH A LNDG CLRNC. THE CTLR SIMPLY SAID 'ACFT CALLING; RADIO UNREADABLE.' MY STUDENT DID THE RIGHT THING AND REMAINED CLR OF THE CLASS D AIRSPACE UNTIL CONTACTING THE TWR. FINALLY; AFTER MY STUDENT CALLED ON THE 3RD OR 4TH TIME; THE TWR HEARD HIM AND CLRED HIM TO ENTER IN THE AIRSPACE. AFTER LNDG; MY STUDENT WAS HANDED TO GND CTL; WHERE HE REQUESTED TKOF AND LNDG PRACTICE. GND INSTRUCTED MY STUDENT TO TAXI TO THE RWY FOR TKOF. MY STUDENT THEN WAS HANDED OFF TO THE TWR AND THE TWR CLRED MY STUDENT FOR TKOFS AND LNDGS. AS SOON AS THE CHAMP CAME DOWNWIND AND REQUESTED A LNDG CLRNC; THE TWR AGAIN SAID 'RADIO UNREADABLE.' TWR WOULD NOT GIVE MY STUDENT A LNDG CLRNC. MY STUDENT CONTINUED TO FLY THE PATTERN AND REQUESTED LNDG SEQUENCE. IT WASN'T UNTIL THE STUDENT ASKED THE TWR 3 OR 4 TIMES FOR 'SEQUENCE' DID THE CTLR FINALLY RESPOND. HIS RESPONSE; IN MY OPINION; WAS UNPROFESSIONAL. HE SAID SOMETHING LIKE THIS; 'OK; CHAMP; DON'T RESPOND; YOUR RADIO IS BLASTING OUT MY EARS; ROCK YOUR WINGS TO CONFIRM YOU ARE CLRED TO LAND; THAT RADIO IS NO GOOD.' THIS ACTION BY THE CTLR CREATED AN UNSAFE ENVIRONMENT IN THE TFC PATTERN. THE CTLR SHOULD NOT HAVE EVEN CLRED MY STUDENT FOR TKOF IF HE FELT THE RADIO WAS A PROB. GND CTL; MYSELF IN THE OTHER AIRPLANE; AND THE BONANZA COULD HEAR THE CHAMP RADIO JUST FINE.