A 915MHz tuner supporting OpenLRS

The schematic diagram mainly refers to LazeLink-LITE . There is no USB serial port circuit and some circuits are added to the radio frequency part. Thank you; this board is just to verify the idea, so it is made big and ugly x

Mainly adding PA and LNA, built-in automatic switching switch for transmitting and receiving, no need to change the code

The PA uses RDA6625e, which is said to have a 2W output (and is really cheap...). For the manual, see my other test board; the actual output power cannot be measured because there is no spectrum analyzer before school starts...

There is a 15dB resistor attenuator on the board to match the input power

LNA uses TQP3M9009, mainly because I happen to have a bunch of them

Front-end low-pass filter

For firmware, choose OpenLRS's 915MHz TX-2 or RX-2. For the Pro Mini module, buy 5V. The wireless module is the 915MHz module of Si4432.

Proofing board thickness 1.0mm