INSTRUCTOR WITH INST STUDENT ON IFR FLT PLAN HAS RADIO COM PROB.

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WE FILED AN IFR FLT PLAN WITH THE FAA. THIS WAS AN IFR TRAINING FLT. THE WX WAS VFR AND CLR THROUGH 12000 FT (WE HAD UNLIMITED CEILING) AND VISIBILITY GREATER THAN 15 MI. THIS WAS ROUND ROBIN FROM T47 TO LAW TO PWA TO MUSKS INTXN DIRECT TO PAULS VALLEY MUNI DIRECT TO DUC DIRECT TO T47 USING SKB. AT MUSKS INTXN WE WERE WITH ZFW ON 128.1 AT 5000 FT. WE BEGAN TO HAVE INTERMITTENT COM. CTR COULD NOT RECEIVE US BUT WE COULD RECEIVE THEM. CTR ASKED US TO IDENT IF WE COULD HEAR THEM; WHICH WE DID. AT THAT TIME WE LOST COM WITH CTR ALTOGETHER. WE CONTINUED ON OUR FLT PLAN TO PAULS VALLEY MUNI AND THEN DIRECT TO DUNCAN VOR. AS WE WERE CLBING THROUGH 3500 FT WE REGAINED CONTACT WITH ZFW ON 128.1 AND FINISHED OUR FLT. CTR ASKED US TO CALL THEM WHEN WE LANDED; WHICH WE DID. WE FLEW THE WHOLE FLT WITH NO RADIO PROBS UNTIL THAT POINT AND DID NOT HAVE ANY RADIO PROBS AFTER. WE FEEL THERE COULD BE A SAFETY PROB IN THAT AREA WITH RADIO COM. IF WE WERE IFR WE WOULD HAVE HAD TO LAND AT PAULS VALLEY MUNI AND THE PROB WOULD HAVE STILL BEEN THERE. WE RECOMMEND THAT THE SIGNAL BOOSTERS (REPEATERS) FROM ZFW BE CHKED FOR THE AREA AROUND MUSKS INTXN FOR SIGNAL STRENGTH. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES WHEN HE LANDED HE CONTACTED THE CTR SUPVR WHO SEEMED MORE CONCERNED THAT RPTR HAD NOT MADE A FULL STOP LNDG THAT THERE MIGHT BE AN EQUIP PROB. RPTR WAS 2000 FT ABOVE THE MEA WHEN CONTACT BEGAN TO BE A PROB. THEY REGAINED COM AT A LOWER ALT ON CLBOUT BUT WERE SW OF THE ARPT AT THAT TIME. RPTR WORKS ON COM AND NAV EQUIP FOR THE MIL AND IS AWARE OF THE PROBS OF SUCH EQUIP. HE FEELS THAT THERE WAS CERTAINLY A PROB WITH THE REPEATERS OR THE SPECIFIC REPEATER BEING USED IN THAT AREA THAT DAY. ACFT EQUIP CHKED OUT OK.