The Speedybee TX800 video transmitter is a small VTX with 20x20mm mounting. It takes 5V input and offers up to 800mW output power. It’s a budget VTX with decent performance.
Where To Buy?
- GetFPV: https://oscarliang.com/product-adnt
- RDQ: https://oscarliang.com/product-i5ip
- AliExpress: https://s.click.aliexpress.com/e/_DnNuO5d
Includes the following accessories:
- 1x MMCX Antenna
- 1x MMCX to SMA Cable
- 1x 1.0mm 4pin JST Cable
- Supported Frequency & Channel: 5.8GHz 48CH (6 Bands)
- Output Power: PIT/25mW/200mW/400mW/800mW
- Working Current: 5V@250~750mA
- Voltage input: 3.7-5.5V
- Voltage output: 5V@max 250mA
- MMCX Antenna Connector
- 3.2g (w/o heatsink/antenna)
- 5.6g (with heatsink, w/o antenna)
- 6.9g (with heatsink/antenna)
- PCB Size: 28x28mm
- Mounting: 20x20mm M3 holes
Closer Look at the TX800 VTX
The Speedybee TX800 comes with a removable heatsink. It’s pretty light weight only 2.6 grams.
The 20x20mm form factor is perfect for modern freestyle frames that normally have 20x20mm mounting at the back, such as the Source One V5. The screw holes are pretty wide, big enough for M3 screws, for M2 fasteners you probably need some sort of washers.
The antenna connector is MMCX, it’s a much more robust connector than the tiny U.FL. You can either connect an antenna to it directly, or use the provided MMCX to SMA cable to mount it in your frame.
Although it comes with an antenna, I recommend getting an aftermarket antenna for better RF performance. The one included is a basic dipole antenna, it’s light weight and works fine in close range, but it won’t give you the best penetration and range.
Warning: DO NOT power the VTX without antenna attached, it can overheat and get damaged.
There are 3 LED’s (blue, red, orange) on the TX800 to indicate what channel, band and power level it’s on. There’s a push button for changing VTX settings. You can also change settings via Betaflight VTX Control (in the OSD menu or via the LUA Script), but beware that it doesn’t use SmartAudio, it uses IRC Tramp protocol.
You can connect the flight controller to the VTX using the JST connector cable provided, or solder the wires directly to the pads on the bottom of the VTX.
It has a 5V output but only has enough current for powering things like your FPV camera.
It supports the following 5.8GHz channels:
The TX800 video transmitter came “locked”, which means the channels in orange are not available out of the box, and it’s limited to only 25mW. You can access all the channels and up to 800mW by unlocking the VTX. When the TX800 is locked, the RED and ORANGE LED will keep blinking.
To unlock the TX800, long press the button for 10 seconds.
You can lock the TX800 again by holding down the button for 10 seconds.
How to Change Channels/Power?
There are two ways to change VTX settings such as channels and power level on the TX800:
- Using the push button on the VTX
- Betaflight OSD menu (or LUA script)
- Short press the button to switch CH1/2/3/4/5/6/7/8
- Long press the button for 2 seconds to switch band1/2/3/4/5/6
- Long press the button for 5 seconds to switch to 25/200/400/800mW
LED indicators meaning:
To be able to change VTX settings via Betaflight OSD menu, you have to setup VTX control as explained below.
VTX Control Setup (VTX Table)
Connect the IRC wire/pad from the VTX to the TX pad of a spare UART on the flight controller.
In the Ports Tab in the Configurator, select “IRC Tramp” under “Peripherals” for the UART you are using for the VTX.
For VTX control to work properly in Betaflight, you need to download and load this JSON file in the Video Transmitter tab in the Configurator (link provided by Speedybee): https://speedybee.s3.amazonaws.com/vtxtable/betaflight/TX800/SpeedyBee-TX800(USA).json
Or just copy this snippet in the CLI:
vtxtable bands 5
vtxtable channels 8
vtxtable band 1 BOSCAM_A A CUSTOM 5865 5845 5825 5805 5785 5765 5745 5725
vtxtable band 2 BOSCAM_B B CUSTOM 5733 5752 5771 5790 5809 5828 5847 5866
vtxtable band 3 BOSCAM_E E CUSTOM 5705 5685 5665 0 5885 5905 0 0
vtxtable band 4 FATSHARK F CUSTOM 5740 5760 5780 5800 5820 5840 5860 5880
vtxtable band 5 RACEBAND R CUSTOM 5658 5695 5732 5769 5806 5843 5880 5917
vtxtable powerlevels 5
vtxtable powervalues 25 200 400 600 600
vtxtable powerlabels 25 200 400 800 800
VTX Pit Mode
The TX800 supports Pit Mode activation via a switch, it basically reduces the output power of your VTX to an extremely low level (only enough for a few meters of range) so it won’t interrupt other pilots while they are still in the air, it also keeps your VTX cooler. It’s useful for troubleshooting when you are in a race/meetup or when your quad is down.
In the Modes tab in the Configurator, assign an Aux channel to VTX Pit Mode.
Link provided by Speedybee: https://store-fhxxhuiq8q.mybigcommerce.com/product_images/TX800/TX800-Manual-EN.pdf
Output Power Testing
Powers were tested using the ImmersionRC Power Meter V2, so take it as a grain of salt as it’s not the most accurate tool in the world. But the numbers look pretty decent IMO. Wondering which channel is best for FPV? Check out this post.