I put my layout for a GPS RS-232 level converter board up on OSHPARK's shared projects. It has places for mounting the Trimble Res-T, the Adafruit Ultimate GPS, and the CN06 (Ublox 6M). The RS-232 circuit has a selectable polarity 1PPS ouput. You can use a3.3V or 5V regulator or there is a jumper for providing the receiver with the raw input power. https://oshpark.com/shared_projects/YPvKgMYa