If you are looking for an ultra light 250mw AV Transmitter Module for your racing drone, the Eachine TX250 Mini weighs only 8 grams and just slightly larger than an American quarter. This transmitter is able to receive 40 channels with the raceband channels, a perfect size for any model aircrafts requiring something small and light.
During a race, the ability to change to an assigned video frequency easily is important. No more dip switch, a long press on the button changes the frequency group and a short press on the button changes the channels.
What Comes to Mind
Beginners, Racing Drones, Weight Matters, Budget under USD $20 (2016)
What To Expect If This Your First
It will feel relatively hot after 5 minutes, on the other hand this is quite common for tiny video transmitters. With the amount of heat generated, it should be placed outside where you can get as much airflow. Another option is if you can fit a tiny heatsink on it. Always keep the antenna attached, as it helps dissipate some of the heat. Don’t remove the plastic wrap, it is there to prevent accidental contact with another component. Typically the vtx are manufactured to withstand a signicant amount of heat, so not much to worry, just follow the suggested common sense best practice.
There is a misprint on the label listing it as 32 channels instead of 40 channels.
The Eachine TX250 Mini can support a wide range of batteries from 7 volts to 26 volts (2s-6s LiPo) on a JST connector. Even though the vtx supports 2s-6s, a jst cable is more suitable for a 2s LiPo battery.
You will need a RHCP receiver antenna to match the transmitter, Banggood did not label them and should take the time to label circular antennae to stop the guessing game. If you not sure, open it up following this guide: Is This Antenna LHCP or RHCP Can I tell? Circular polarization
Range Test Results and Performance
TBD, we will take it up on a plane or hexacopter and find it’s range limit.
Brand name: Eachine
Item name :Eachine TX250 Transmitter
Operating voltage: 7V-26V
Maximum transmit power:26db
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Contribution by the DroneMission.com Usability Test Team, a member of the Linux Foundation dronecode.org and an executive board member Kinglea UAV and Walkera USA.