RCT6705 Image Transmission Remastered Version V3

As shown in this project, my video transmission version 3.0 is completed.
Currently, there are some problems with power control, so the microcontroller version 4.0 is not open source for the time being.

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1. Power problem: the RFPA5542 amplifier is set to 27dbm by default in this PCB (

2. Frequency issue: The frequency selection is updated, from soldering resistor control to direct soldering, and the SPI mode can be switched to connect to the microcontroller to control the frequency (the 4.0 microcontroller version will have onboard GD32). The frequency table is in the attachment

3. Peripheral simplification: The peripheral circuit of RTC6705 is extremely simplified, with many fewer components than the previous two generations, reducing costs and production time.

4. Antenna holder After suggestions from netizens, the antenna holder was changed from SMA to sunken plate type MMCX to facilitate the later addition of heat dissipation.

5. The wiring problem is well known. The wiring of the previous two generations is the same as ##, which greatly affects the signal, causing serious interference and snowflakes. The high-frequency lines of V3.0 are all covered with ground holes, and the turns of the lines are reduced. Special thanks are given here. @ copterman  ’s advice!

6. It is forbidden for commercial enthusiasts to just do it for fun, commercial users only