ACR CLRED RWY HDG FOR VECTORS; HAD LOST COM.

Narrative

WE WERE CLRED FOR TKOF TO MAINTAIN RWY HDG; CLB TO 4000 FT. PRE-DEP CLRNC WAS RWY HDG FOR RADAR VECTORS EXPECT REQUESTED AT 10 MINS AFTER DEP. FILE RTE OF FLT WAS BWI DCA 246/80 MOL MACEY 1 ATL. FL310 IMMEDIATELY AFTER TKOF WE EXPERIENCED COM FAILURE OF BOTH VHF RADIOS. ACFT WAS LEVELED OFF AT 4000; RWY HDG. ATTEMPTED TROUBLE SHOOTING AND NUMEROUS RADIO TRANSMISSIONS TO ATC ON VARIOUS FREQS. SQUAWKED 7600 AND INITIATED A CLB TO FL310 10 MINS AFTER TKOF AS PER PRE-DEP CLRNC. TURNED TO INTERCEPT DCA 246 RADIAL. WAS ABLE TO CONTACT ATC AT APPROX 16000 FT. FLT WAS ROUTINE THEREAFTER (NO OTHER PROBLEMS WITH THE RADIOS ON ANY FREQS). THE PROBLEM WAS THAT RWY HDG FOR RWY 28 BWI WOULD NOT INTERCEPT THE DCA 246 RADIAL. SUGGEST LOST COM PROC WHEN ON A MAINTAIN RWY HDG FOR VECTORS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. RPTR STATES THEY HAD NO FURTHER PROBLEM SO DID NOT REQUEST MAINT. COULD NOT DUPLICATE CONDITION. TRIED SEVERAL FREQS DURING COM LOSS BUT NOT SURE THEY WERE CORRECT ONES.