Plug-and-play matched air/ground pair pairs automatically out of the box with Pixhawk-standard flight controllers
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Telemetry Antennas
Holybro SiK Telemetry Radio V3 433MHz 100mW
The Holybro SiK Telemetry Radio V3 (433MHz, 100mW) is a plug-and-play bidirectional radio set that creates a wireless serial data link between your drone's flight controller and a ground station running Mission Planner, QGroundControl or any MAVLink GCS.
₹6,999 + 18% GST
SKU: BOTBIT-TEL-01 · Best for: Live MAVLink telemetry monitoring for Pixhawk/PX4 multirotors and fixed-wing UAVs
Overview
About Holybro SiK Telemetry Radio V3 433MHz 100mW.
The Holybro SiK Telemetry Radio V3 (433MHz, 100mW) is a plug-and-play bidirectional radio set that creates a wireless serial data link between your drone's flight controller and a ground station running Mission Planner, QGroundControl or any MAVLink GCS. The kit ships as a matched pair: an air module that connects to the autopilot's TELEM port via a 6-pin JST-GH cable, and a ground module that plugs into your laptop over USB-C. Once powered, the two modules automatically pair and pass MAVLink telemetry transparently, so you see live attitude, GPS position, battery voltage and mission status while flying.
Built on the open-source SiK firmware, the V3 uses frequency-hopping spread spectrum across up to 50 channels for resilient links in noisy environments, plus forward error correction that repairs corrupted packets. The 100mW (20dBm) output of this variant is the lower-power option, well suited to the 433MHz band commonly used outside the Americas. It delivers a reliable link of a few hundred metres on the supplied whip antennas, extendable to several kilometres with a directional ground antenna.
This 100mW version is aimed at hobbyists, students and developers building Pixhawk or PX4 multirotors, fixed-wings and rovers who need dependable telemetry and parameter tuning over short-to-medium range without the higher current draw or regional power concerns of the 500mW unit.
Key features
Why it stands out.
Open-source SiK firmware passes MAVLink telemetry transparently to Mission Planner, QGroundControl, ArduPilot and PX4
Frequency-hopping spread spectrum across up to 50 channels resists interference and co-channel users
Forward error correction repairs up to 25% of bit errors for a stable link in noisy RF environments
Configurable air data rates, baud and network ID via Mission Planner or AT commands for tuning range vs throughput
Specifications
Selection facts.
| Frequency | 433 MHz |
|---|---|
| Output power | 100 mW (20 dBm) |
| Receive sensitivity | -121 dBm @ 2 kbps |
| RF data rates | 2 to 250 kbps (64 kbps default) |
| Serial interface | 3.3 V TTL UART, 6-pin JST-GH |
| Baud rates | 1.2 to 115.2 kbps (57.6 kbps default) |
| Supply voltage | 5 V DC (USB or JST-GH) |
| Antenna connector | RP-SMA female |
| Dimensions | 28 x 53 x 10.7 mm (without antenna) |
| Operating temperature | -40 to 85 C |
Applications
Where it is used.
- Live MAVLink telemetry monitoring for Pixhawk/PX4 multirotors and fixed-wing UAVs
- In-field parameter tuning and PID adjustment over a wireless link
- Autonomous waypoint mission upload and real-time progress tracking
- Ground rover (UGV) command and status links in ArduRover builds
- Bench testing, firmware development and MAVLink integration projects
- Educational and student drone projects needing low-cost wireless data
Buying guide
How to choose.
Choose the 433MHz band when operating in India, Europe and most of Asia, where the 902-928MHz (915MHz) band used in the Americas is not appropriate. Confirm the legal ISM/license-exempt allocation for your region and intended power before flying, as telemetry radio use is governed by local spectrum rules.
Pick this 100mW variant if your missions are short-to-medium range (a few hundred metres on stock antennas) and you want lower current draw and simpler thermal behaviour. If you regularly need longer links, step up to the 500mW V3 (BOTBIT-TEL-02) or a 1W-class long-range modem such as the RFD900-series for kilometre-scale work.
Buy the radio as a matched pair so the air and ground modules share firmware and pair instantly. For extra ground range, add a higher-gain directional antenna on the GCS side while keeping a lightweight whip on the aircraft.
FAQ
Common questions.
Does the 433MHz version work in India?
433MHz is the band commonly used for telemetry outside the Americas, including India and Europe. Always verify the current license-exempt ISM allocation and permitted power limits with local regulations before operating, since spectrum rules vary and can change over time.
What range can I expect on 100mW?
On the supplied whip antennas you can expect a reliable link of a few hundred metres. Range extends to several kilometres when you fit a directional or higher-gain antenna on the ground station and maintain clear line of sight.
Which software does it support?
The radio runs open-source SiK firmware and passes MAVLink transparently, so it works with Mission Planner, QGroundControl, ArduPilot and PX4. You configure air data rate, baud and network ID through Mission Planner or AT commands.
How does it connect to my flight controller?
The air module plugs into the autopilot's TELEM port using the included 6-pin JST-GH cable at 3.3V UART. The ground module connects to your laptop over USB. Both run on 5V and pair automatically once powered.
What is the difference between 100mW and 500mW?
Both share the same firmware and features; the 500mW variant transmits at a higher 27dBm power for greater range at the cost of higher current draw. Choose 100mW for shorter missions and lower power, 500mW for longer links.
Can I use this on a ground rover?
Yes. The radio is protocol-agnostic over MAVLink, so it works equally well on ArduRover UGVs, boats and fixed-wing aircraft, not just multirotors. Any Pixhawk-standard controller with a TELEM port is compatible.
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