AN LJ31 CREW; DEPARTING EUG; EXPERIENCED COMS FAILURE CAUSED BY ATC EQUIP. A DIFFERENT FREQ WAS ISSUED WHICH SOLVED THE PROB.

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WE DEPARTED EUG ARPT ON THE EUG 5 DEP; AS ASSIGNED. THE DEP SAYS TO CLB ON ASSIGNED HDG FOR VECTORS AND TO MAINTAIN 9000 FT. WE WERE TOLD TO FLY RWY HDG; WHICH WE DID. AFTER DEP; TWR TOLD US TO CONTACT CASCADE DEP; WHICH WE DID. THERE WAS NO REPLY AFTER ABOUT 4 CALLS; SO WE TRIED ANOTHER RADIO AND ALSO TRIED COMMUNICATING FROM BOTH SIDES OF THE COCKPIT; AS WELL. THERE WAS STILL NO REPLY; THEN CASCADE DEP CALLED US TO SEE IF WE WERE ON FREQ; BUT THE CTLR DID NOT HEAR US ANSWER. NEXT; THE CTLR TOLD US TO IDENT; WHICH WE DID. 2 OR 3 MORE TIMES THE CTLR TOLD US TO IDENT IF WE COULD HEAR HIM. THE CTLR SAID HE WAS SEEING OUR IDENTS; BUT STILL GAVE US NO INSTRUCTIONS. DUE TO THE FACT THAT WE WERE IN VFR CONDITIONS STILL; AND ALMOST AT 9000 FT; BUT WERE ABOUT TO ENTER THE CLOUDS; I DECIDED TO STAY IN VFR CONDITIONS. I MADE A L TURN BACK TOWARDS THE VOR ON EUG ARPT TO BOTH STAY IN VFR CONDITIONS; AND TO FOLLOW THE LOST COM PROCS ON THE SID. IF WE DID NOT ESTABLISH COMS SOON; I WAS GOING TO JUST STAY VFR AND LAND. AS WE BEGAN TO LEVEL OFF AT 9000 FT AND WERE NOW HEADED BACK TO THE ARPT/VOR; I TOLD MY COPLT TO CALL THE TWR. THE TWR IMMEDIATELY REPLIED. WE TOLD TWR OUR PROB AND TWR GAVE US ANOTHER FREQ TO TRY. AS SOON AS WE CALLED CASCADE DEP ON THE NEXT FREQ; HE REPLIED/TOLD US TO CLB AND MAINTAIN 12000 FT AND CLRED US ON COURSE. I DISCUSSED WHAT HAD HAPPENED AND TOLD CASCADE I HAD INITIATED THE TURN TO STAY VFR AND ALSO TO FOLLOW THE IFR LOST COM PROC UNTIL I WAS SURE WE COULD STAY VFR AND LAND; IF WE COULD NOT MAKE CONTACT. CASCADE REPLIED AND SAID IT WAS 'HIS EQUIP' THAT HAD CAUSED THE PROB. I DON'T KNOW WHAT ELSE WE COULD HAVE DONE. WE DID AS INSTRUCTED; WERE ON THE PROPER FREQ; AND STAYED IN VFR CONDITIONS WHEN WE REALIZED WE MIGHT HAVE A COM PROB. I DID HAVE TO DEVIATE FROM THE ASSIGNED HDG; BUT DID SO TO STAY VFR; IF POSSIBLE; LIKE THE REGS INSTRUCT. THE REST OF THE CLB AND FLT WERE UNEVENTFUL.