FALCON 10 FLT CREW DURING DEP IS BELOW THE MVA FOR THE AREA.

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I WAS THE PNF CAPT ON THIS FLT; THE FO WAS AT THE CTLS; AND I WAS WORKING THE RADIOS. UPON TALKING TO THE ATC CTLR AFTER THE FLT; I WAS INFORMED THAT 2 FACTORS CONTRIBUTED TO OUR ACFT ENTERING A 2200 FT MVA ZONE AT 2000 FT: 1) THE RADAR TRACK SHOWED OUR INITIAL TURN BEGINNING AT 2 3/4 MI FROM THE DEP END OF RWY 15 IN ADS. 2) OUR DELAYED INITIAL CONTACT WITH DEP CTL. THE NOISE ABATEMENT DEP PROC OUT OF ADS REQUIRES A L TURN TO 100 DEG HDG AFTER 1.5 DME FROM THE RWY 15 LOC DME; WITH A CLB TO 2000 FT (CLRED ALT). MY COPLT REMEMBERS WITH CERTAINTY HIS DME SHOWING 1.8 WHILE IN THE TURN TO 100 DEG HDG. TYPICALLY; WHEN DEPARTING FROM ADS RWY 15; THE HDOF TO DEP OCCURS SHORTLY AFTER TKOF; WHILE ON RWY HDG; BEFORE THE TURN TO 100 DEG HDG AT 1.5 DME. ONE NORMALLY GETS A NEW VECTOR FROM THEM BEFORE THE TURN TO 100 DEGS IS COMPLETED. MY FIRST 2 ATTEMPTS AT CONTACTING ATC WERE UNSUCCESSFUL. I COULD NOT HEAR SIDE-TONE OR RECEPTION THROUGH THE RADIO. THE RADIO CAME BACK ON THE THIRD ATTEMPT (WHICH WAS TO BE THE LAST BEFORE TRYING OUR #2 RADIO); AND WE WERE REQUESTED AN IMMEDIATE TURN; WHICH WE ACCOMPLISHED PROMPTLY. WE WERE INFORMED BY ATC THAT OUR XMISSION WAS BARELY READABLE. WE THEN SWITCHED RADIOS; WHICH FIXED THAT PROB. FURTHER DOWN THE FLT; OUR RADIOS DID NOT GIVE US ANY MORE TROUBLE. OUR DELAYED CONTACT WITH ATC CAN BE ATTRIBUTED TO A TEMPORARY RADIO MALFUNCTION WHICH CORRECTED ITSELF. THE WHOLE EVENT COULD NOT HAVE EXCEEDED 20 SECONDS. AS FAR AS THE DELAYED TURN. RADAR TRACK CONCURS NEITHER WITH COCKPIT INSTS DISPLAYS NOR OUR GND TRACK. WE ARE BASED OUT OF ADS AND ARE HIGHLY FAMILIAR WITH THE GND REF AT WHICH THE 1.5 DME TURN BEGINS. THIS ONE HAPPENED AS USUAL. NONETHELESS; WE WILL HAVE OUR DME EQUIP INSPECTED.