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41 lines
2.8 KiB
Markdown
41 lines
2.8 KiB
Markdown
# Telemetry Radios/Modems
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Telemetry Radios can (optionally) be used to provide a wireless MAVLink connection between a ground control station like _QGroundControl_ and a vehicle running PX4. This makes it possible to tune parameters while a vehicle is in flight, inspect telemetry in real-time, change a mission on the fly, etc.
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PX4 supports a number of types of telemetry radios:
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- [SiK Radio](../telemetry/sik_radio.md) based firmware (more generally, any radio with a UART interface should work).
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- [HolyBro SiK Telemetry Radio](../telemetry/holybro_sik_radio.md)
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- [RFD900 Telemetry Radio](../telemetry/rfd900_telemetry.md)
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- [ThunderFly TFSIK01 Telemetry Radio](../telemetry/tfsik_telemetry.md)
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- <del>_HKPilot Telemetry Radio_</del> (Discontinued)
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- <del>_3DR Telemetry Radio_</del> (Discontinued)
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- [Telemetry Wifi](../telemetry/telemetry_wifi.md)
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- [J.Fi Wireless Telemetry Module](../telemetry/jfi_telemetry.md)
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- [Microhard Serial Telemetry Radio](../telemetry/microhard_serial.md)
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- [ARK Electron Microhard Serial Telemetry Radio](../telemetry/ark_microhard_serial.md)
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- [Holybro Microhard P900 Telemetry Radio](../telemetry/holybro_microhard_p900_radio.md)
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- CUAV Serial Telemetry Radio
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- [CUAV P8 Telemetry Radio](../telemetry/cuav_p8_radio.md)
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- XBee Serial Telemetry Radio
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- <del>[HolyBro XBP9X Telemetry Radio](../telemetry/holybro_xbp9x_radio.md)</del> (Discontinued)
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PX4 is protocol compatible with [SiK Radio](../telemetry/sik_radio.md) and will generally work out of the box (though you may need to change/use an appropriate connector).
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WiFi telemetry typically has shorter range, higher data rates, and makes it easier to support FPV/video feeds.
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One benefit of WiFi radios is that you only need to purchase a single radio unit for your vehicle (assuming the ground station already has WiFi).
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::: info
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PX4 does not support connecting an LTE USB module to the flight controller (and sending MAVLink traffic via the Internet).
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You can however connect an LTE module to a companion computer and use it to route MAVLink traffic from the flight controller.
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For more information see: [Companion Computer Peripherals > Data Telephony](../companion_computer/companion_computer_peripherals.md#data-telephony-lte).
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:::
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## Allowed Frequency Bands
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Radio bands allowed for use with drones differ between continents, regions, countries, and even states.
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You should select a telemetry radio that uses a frequency range that is allowed in the areas where you plan on using the drone.
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Low power [SiK radios](../telemetry/sik_radio.md), such as the [Holybro Telemetry Radio](../telemetry/holybro_sik_radio.md), are often available in 915 MHz and 433 MHz variants.
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While you should check applicable laws in your country/state, broadly speaking 915 MHz can be used in the US, while 433 MHz can be used in EU, Africa, Oceania, and most of Asia.
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