+---------+         +---------+
       |         |         |         |      +-------+
       | UART    +-------->+  si5351 +----->+ mixer +---------> 220Mhz
       |         |         |         |      +---+---+
       +---------+         +---------+          |
                                                |
                                                |
                                              +-+-+
                                              |LO |
                                              +---+
       
       
                  +------------+   +------------+   +-----------+
       220Mhz     | 220Mhz LPF |   |RF driver   |   |Power Amp  |
          +------>+ BW = 6Mhz  +-->+            +-->+           |
                  +------------+   +------------+   +-----------+