We have developed a small PCB with a u-blox LEA-M8F GPSDO that fits on the USRP B200 and enables the use of the LEA-M8F as a time and frequency reference.
The board includes footprints for side-mounted SMA connectors and can also be used independently, powered by USB. The UART, USB and I2C interfaces to the LEA-M8F are available on the board.
The board has been designed with the latest KiCAD build, and the design files are available on Github and are released under a CC-BY-SA licence.
This board is compatible with ODR-DabMod combined with the USRP B200, but it requires a customised version of UHD available here.
The board was produced at the Seeedstudio Fusion PCB service, with the following lea-m8f-productionfiles-may-2015. Schematics with soldering and setup instructions in PDF: lea-m8f-schematic-may-2015
The u-blox LEA-M8F can be bought on the u-blox webshop. All other components are available on Farnell, a BOM is available here.