Video transmitters (VTXs)
Radio receivers (RXs)
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Lightweight VTXs & Cams
Walksnail Avatar 1S VTX
A smaller and lighter version of the Avatar VTX. There is a version with the standard Nano camera and a LITE version with an even lighter board and camera. It only works up to 5V though so you'll need a 5V 2A BEC if you're running 2S batteries!
vtxs & cams
HDZero Race V2 VTX
HDZero offers unparalleled performance for racing and competitive freestyle flying. This VTX fits on 20mm M3 mounting which is the standard for racing quads. The 200mW output power is modest but most racing events limit output power to 25mW so this isn't a serious limitation.
The DJI O3 system pushes digital FPV in a new direction. Here the focus is onboard recording and image quality at the expense of latency. It is a great looking system, some pilots are reporting issues with vibration sensitivity of the IMU used for electronic image stabilisation, hopefully this will be resolved in a future firmware update.
Happymodel ExpressLRS Nano 2.4GHz EP1 RX
Happymodel were the first to bring out ELRS hardware and their EP1 and EP2 receivers closely follow the developers reference design and are incredibly tiny. I lean towards the EP1 as the UFL antenna is much higher performing than the ceramic antenna on the EP2. If you need the smallest size and weight the EP2 is also a great choice.
MATEKSYS ExpressLRS 2.4GHz
I've made my mind up. I'm only recommending ELRS moving forward. At this point it does everything better than any other radio link. LoRa for range and penetration, yes. 1000Hz update rate for crazy low latency, yes. Loads of manufacturers are making receivers for ELRS and I think this diversity offering from Matek is certainly among the best performing and most reliable.