MISSED APCH POINT MISSED BY PLT DURING AN IMC NIGHT OP APCH TO EL CAJON.

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VECTORED TO SAMOS OM/INTXN. ESTABLISHED ON LOC D; PASSED WITH SIGNAL SAMOS OM AND RPTED AT 4100 FT. STARTED DME AND CONTINUED DSCNT AT 500 FPM. AT APPROX 5 MINS; STARTED TO CALL MISSED APCH (NO GREGG FM INDICATION AT 2400 FT) WHEN TWR INDICATED APCH CTL WANTED EXPEDITED L 180 DEG TURN AND CLB TO 3000 FT. APCH ADVISED I HAD OVERFLOWN THE RWY 5 KM/ACKNOWLEDGED FM OUT; THEN ADVISED NOT OUT? WHILE ON CLB OUT HEARD OTHER ACFT CALL MISSED APCH. I MAY HAVE BEEN VECTORED INSIDE SAMOS AND MISTOOK FOR GREGG OR FM MAY ACTUALLY HAVE BEEN OUT AND MISSED APCH DUE TO HOLDING 2400 FT. NEXT TIME I'LL USE MY LORAN C FOR BACKUP (NOT AUTHORIZED IFR). WOULD BE MUCH SAFER TO BE ABLE TO UTILIZE THE LORAN C AS A DME FOR THIS TYPE APCH; OR PUT A DME ON THIS TYPE APCH; OR HAVE A MEANS TO DETERMINE IF THE FM IS OPERATIONAL OR PUT A BRIGHT DISPLAY IN TWR FOR AID TO PLTS IN SUCH A DILEMMA. I'M PRETTY SURE I WAS VECTORED TO LARDY INTXN; NOT INSIDE SAMOS. HOWEVER; TIME/DISTANCE INDICATES I WAS VECTORED INSIDE SAMOS AND GREGG APPEARED AS OM. NEXT TIME THERE I WILL CHK THE SYS IN VFR CONDITIONS AND SEE HOW IT WORKS OUT.