Osmo-lea6t-gps » History » Revision 2
Revision 1 (laforge, 02/19/2016 10:48 PM) → Revision 2/12 (laforge, 02/19/2016 10:48 PM)
[[PageOutline]] = osmo-lea6t-gps = The swiss makes of GPS receiver chips and modules u-blox has (among others), a line of so-called ''timing'' GPS modules. The main difference of such modules compared to the standard modules is their ability to output arbitrary GPS-derived clock FIXME signals anywhere between 0.25 Hz and 10 MHz. This allows such modules to be used in a varity of high-precision timing applications where a simpler/traditional approach using regular 1PPS outputs is not sufficient. The Osmocom project has developed an evaluation / development board for the u-blox LEA-6T timing module. Like all other Osmocom projects, it is fully open source, i.e. schematics and layout files are freely available. == Electrical Design == === Schematics and Layout === The most up-to-date versions of the schematics and layout files can be found in the projects git repository which can be browsed at http://cgit.osmocom.org/cgit/osmo-lea6t-gps/ or cloned like this: {{{ $ git clone git://git.osmocom.org/osmo-lea6t-gps }}} === Major components === * LEA-6T Module ([http://www.u-blox.com/en/gps-modules/u-blox-6-timing-module/lea-6t.html product page], [http://www.u-blox.com/images/downloads/Product_Docs/LEA-6_DataSheet_%28GPS.G6-HW-09004%29.pdf data sheet]) * FIXME: add more components here == How to use == You can connect to it using one of the Osmocom-style serial cables (3.3V UART on 2.5mm audio jack) or using USB. You will get a serial port that can speak either NMEA or the proprietary UBX protocol. The full protocol is specified in the [http://www.u-blox.com/images/downloads/Product_Docs/u-blox6_ReceiverDescriptionProtocolSpec_%28GPS.G6-SW-10018%29.pdf u-blox 6 protocol specifiation]. == Where to buy == You can have the PCB etched anywhere you'd like, using the layout data we have provided. Most of the components are available via distributors like Digikey. Only the LEA-6T module has to be obtained through an u-blox distributor. Alternatively, [http://sysmocom.de/ sysmocom] is selling DIY kits including the PCB and all components [http://shop.sysmocom.de/products/osmo-lea6t-gps in their webshop]. Please note that you still have to solder all parts by yourself.