ALTDEV. MISCOM ON MISSED APCH.

Narrative

I WAS THE CAPT ON FLT FROM PBI TO EWR. AT 200 FT AGL WE GOT AN UNSAFE GEAR INDICATION FOLLOWED BY AN AURAL WARNING. I MISSED THE APCH AND LEFT THE AREA TO HAVE TIME TO FOLLOW OUR FLT MANUAL PROCS AND VERIFY IF THE LNDG GEAR WAS INDEED DOWN OR NOT. THE LNDG GEAR WAS VERIFIED DOWN AFTER A VISUAL INSPECTION BY MY FO. DURING THE MISSED APCH WE WERE CONFUSED AS TO WHAT ALT WE WERE GIVEN TO CLB TO. WE BOTH THOUGHT WE WERE TOLD TO CLB TO 3000 FT; BUT LATER INSTRUCTIONS FROM THE TWR TOLD US TO MAINTAIN 2000 FT. I IMMEDIATELY DSNDED BACK TO 2000 FT HAVING CLBED NO HIGHER THAN 2500 FT. THERE WAS NO CONFLICT WITH ANY OTHER AIR TFC. AFTER VERIFYING THAT OUR LNDG GEAR WAS INDEED DOWN AND LOCKED; MY FO COORDINATED WITH X MAINT AT EWR TO INSTALL OUR GEAR PINS BEFORE WE TAXIED TO A GATE. WE MADE AN UNEVENTFUL NORMAL LNDG AT EWR WITH THE EMER EQUIP STANDING BY. AFTER CLRING THE RWY I PARKED THE ACFT SO THAT THE GEAR PINS COULD BE INSTALLED. TO COORDINATE THIS EFFORT WE ATTEMPTED TO CALL COMPANY MAINT ON FREQ 131.22; BUT INSTEAD WE WERE COMMUNICATING WITH Y MAINT ON THIS SAME FREQ. OUR GEAR PINS WERE EVENTUALLY INSTALLED BY OUR RAMP PEOPLE; WHO WERE ESCORTED TO OUR ACFT BY EWR PART AUTH. WE WERE THEN HOOKED UP TO A TUG AND TOWED TO OUR GATE. THE COMPANY THEN ADVISED ARINC ABOUT OUR FREQ PROB AT THE S END OF EWR ARPT.