A few years ago I did a board for adding an RS-232 interface to the Trimble Resolution-T timing receiver. It also has connectors and mounting holes for the Adafruit Ultimate GPS and CN06 receivers and can be used with any GPS module with logic level serial ports. It also works with Nick Sayer's Venus Skytraq timing receiver that is pinout compatible with the Adafruit.
I've also found the board to be handy as a general purpose RS-232 interface. There is a small proto area and a footprint for a DIP-8 package processor.
I've received a few inquiries about the board. The layout (Eagle .brd file) is available as a shared project on OSHPARK.COM. You can order it from OSHPARK or download the .brd file and submit it to dirtypcbs, etc.
https://oshpark.com/shared_projects/YPvKgMYaA voltage regulator / RS232 breakout board. Has mounting holes for the Adafruit Ultimate GPS, CN06 (Ublox Neo 6M) and Trimble Resolution-T receivers. Others receivers can be easily wired to the board.
Silkscreen says CP3232 RS-232 converter chip. These can be picky about their caps. Use a MAX232A with all 0.47 uF caps (MAX232A’s seem to work just fine on 3.3V... beware of fakes on Ebay. I've also used plain MAX232's with 0.47 uF caps without any problems). The bypass caps marked 0.1uF can also be 0.47uF.
Regulator is any AMS1117 compatible fixed regulator. You can use 3V or 5V regulators depending upon what your receiver wants.
The PWR RAW/REG jumper selects whether the GPS receiver/MAX232A power comes from the regulator or the input jack.
The RS232 PWR jumper connects pin 9 of the RS232 connector to the DC input jack. Or can be wired over to the regulator output.
The PPS polarity jumper selects polarity of the PPS pulse to the pin 1 of the RS232 connector.
There is an 8-pin DIP pattern for an ATTINY85, etc processor and a small prototype area.
Resolution-T antenna power is wired to Vcc, but there is a place to cut the etch marked on the board along with a hole for providing an alternate source of antenna power.
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