+---------+         +---------+
|         |         |         |      +-------+
| UART    +-------->+  si5351 +----->+ mixer +---------> 220Mhz
|         |         |         |      +---+---+
+---------+         +---------+          |
                                         |
                                         |
                                       +-+-+
                                       |LO |
                                       +---+


           +------------+   +------------+   +-----------+
220Mhz     | 220Mhz LPF |   |RF driver   |   |Power Amp  |
   +------>+ BW = 6Mhz  +-->+            +-->+           |
           +------------+   +------------+   +-----------+