Osmo-lea6t-gps » History » Version 2
laforge, 02/19/2016 10:48 PM
| 1 | 2 | laforge | [[PageOutline]] |
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| 2 | 1 | laforge | = osmo-lea6t-gps = |
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| 4 | 2 | laforge | The swiss makes of GPS receiver chips and modules u-blox has (among others), a line of so-called ''timing'' GPS modules. |
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| 6 | The main difference of such modules compared to the standard modules is their ability to output arbitrary GPS-derived clock |
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| 7 | signals anywhere between 0.25 Hz and 10 MHz. |
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| 9 | This allows such modules to be used in a varity of high-precision timing applications where a simpler/traditional approach using |
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| 10 | regular 1PPS outputs is not sufficient. |
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| 12 | The Osmocom project has developed an evaluation / development board for the u-blox LEA-6T timing module. Like all other |
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| 13 | Osmocom projects, it is fully open source, i.e. schematics and layout files are freely available. |
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| 15 | == Electrical Design == |
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| 17 | === Schematics and Layout === |
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| 19 | The most up-to-date versions of the schematics and layout files can be found in the projects git repository which can be |
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| 20 | browsed at http://cgit.osmocom.org/cgit/osmo-lea6t-gps/ or cloned like this: |
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| 21 | {{{ |
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| 22 | $ git clone git://git.osmocom.org/osmo-lea6t-gps |
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| 23 | }}} |
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| 25 | === Major components === |
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| 26 | * 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]) |
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| 27 | * FIXME: add more components here |
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| 29 | == How to use == |
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| 31 | 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 |
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| 32 | a serial port that can speak either NMEA or the proprietary UBX protocol. |
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| 34 | 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]. |
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| 37 | == Where to buy == |
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| 39 | You can have the PCB etched anywhere you'd like, using the layout data we have provided. Most of the components |
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| 40 | are available via distributors like Digikey. Only the LEA-6T module has to be obtained through an u-blox distributor. |
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| 42 | 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. |
