Ligne 309 : |
Ligne 309 : |
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| This is not available in v1 or v2 so if you do not see the uFL connector, you have an older version of the module which cannot support antennas | | This is not available in v1 or v2 so if you do not see the uFL connector, you have an older version of the module which cannot support antennas |
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| + | {{ADFImage|GpsUltimateAntenne00.jpg}} |
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| + | All Ultimate GPS modules have a built in patch antenna - this antenna provides -165 dBm sensitivity and is perfect for many projects. However, if you want to place your project in a box, it might not be possible to have the antenna pointing up, or it might be in a metal shield, or you may need more sensitivity. In these cases, {{pl|244|you may want to use an external active antenna}}. |
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| + | {{ambox|text=Active antennas draw current, so they do provide more gain but at a power cost. Check the antenna datasheet for exactly how much current they draw - its usually around 10-20mA.}} |
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| + | Most GPS antennas use SMA connectors, which are popular and easy to use. However, an SMA connector would be fairly big on the GPS breakout so we went with a uFL connector - which is lightweight, small and easy to manufacture. If you don't need an external antenna it wont add significant weight or space but its easy to attach a {{pl|243|µFL->SMA adapter cable}}. Then connect the GPS antenna to the cable. |
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| + | The Ultimate GPS will automagically detect an external active antenna is attached and 'switch over' - you do not need to send any commands |
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| + | There is an output sentence that will tell you the status of the antenna. '''$PGTOP,11,x''' where '''x''' is the status number. |
| + | * '''3''': If x is 3 that means it is using the external antenna. |
| + | * '''2''': If x is 2 it's using the internal antenna and |
| + | * '''1''': if x is 1 there was an antenna short or problem. |
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| + | On newer shields & modules, you'll need to tell the firmware you want to have this report output, you can do that by adding a '''gps.sendCommand(PGCMD_ANTENNA)''' around the same time you set the update rate/sentence output. |
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| + | On newer shields & modules, you'll need to tell the firmware you want to have this report output, you can do that by adding a gps.sendCommand(PGCMD_ANTENNA) around the same time you set the update rate/sentence output. |
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| + | {{ADFImage|GpsUltimateAntenne01.jpg}} |
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| == Où Acheter == | | == Où Acheter == |