Before building a FPV drone, we usually consider whether to install analog VTX or HD VTX. Of course, HD VTX has high quality images and is the choice of most pilots nowadays, but its price is higher than analog VTX. Analog VTX is small in size and low in price. Matching analog glasses can also quickly switch channels to watch teammates' DVR. Therefore, analog VTX also has certain advantages in terms of functionality. So this time we take you to have a brief introduction to analog VTX.
Let’s start with the simplest classification based on appearance and function. For example, racing drones mostly use Nano VTX. This kind of VTX generally has low power, but it is very easy to use in racing scenes, and its size and weight have advantages. Nano VTX usually does not have mounting holes and is usually wrapped with heat shrink tubing. It is more convenient to attach it to the top plate of the drone or the position of the tail capacitor to save space. The VTX used by aircraft is generally large in size and power, ranging from 800 mW to 2W. Some even require fans to dissipate heat. There are also many protocols for VTX, the common ones are Smart Audio, IRC Trump and Open VTX. Taking our FT800 VTX as an example, we use the same Smart Audio protocol as Team Black Sheep. Frequency and power can be quickly adjusted in the OSD.
So how to weld the FT800 VTX?
Generally, for analog VTX, we need to weld 4 wires to make it work properly, and then we can use the remote control to set the frequency and power through the OSD. For example, we install an 8-inch X8 drone and use F7 Pro FC and FT800 VTX. In addition to welding the positive and negative power supply wires (GND, DC-IN), the VTX also needs to weld the data and video pads. Vedio is the signal line for transmitting images, and DATA is the signal line used by the flight controller to adjust parameters for image transmission. You can take a look at our F7 Pro wiring diagram. We also need a TX port as the control line for VTX. In terms of power supply, our FT800 supports wide voltage input (7-36V).
How to set up FT800 VTX in Betaflight?
Enter Betaflight and select the port menu on the left. The peripheral Uarts settings depend on which TX pad the VTX is welded to. For example, if we weld on TX1, we select Uart1 in Betaflight. Select VTX TBS Smart Audio for peripherals. Then you can check our link: https://www.tmotor.shop/products/tmotor-ft800-vtx?_pos=1&_sid=8f1fd1077&_ss=r
Download the VTX table. Then in Betaflight, in the VTX menu, click Load from file, select the VTX table we just downloaded, and finally click Save.
After setting it up in Betaflight, we can adjust parameters in the OSD. How to enter the OSD parameter adjustment interface? You can use your remote control to move the left joystick to the left and the right joystick to the upward direction.
After entering the OSD interface, we can select the second function: FEATURES. After entering, we select the VTX option. You can see many functional options. The first one is BAND, which refers to the channel. You can choose RACEBAND for commonly used channels, and there are several other channels that you can choose freely. The second one is Chan, which is Channel. If there is a conflict with others, you can change the number manually. Remember to select Save after making changes.
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