Symmetricom 58534A Integrated GPS Antenna/Receiver Although I could not find a spec. It appears that it has the same Pinout as the: ONCORE Remote GPS Antenna Receiver ACUTIME 2000 Trimble Palisade The Provided cable only brings out pins 1-5, 9, 11, 12 These Correspond to Pin 01 Red Vcc (+8 - 36 VDC) Pin 02 Purple Port B Recv- Pin 03 Orange Port B Recv+ Pin 04 Gray Port B Transmit- Pin 05 White Port B Transmit+ Pin 09 Black Ground Pin 11 Green 1PPS Transmit+ Pin 12 Blue 1PPS Transmit- I connected +12VDC to Pin 1 and Goind to Pin 9 and after about 20 Minutes I got good 1PPS from Pin 11 with 50% Duty Cycle (500ms). I have not connected the RS422 yet but on the scope it looked like it was transmiting something. Don Mimlitch