USB Adapter
The USB adapter is a small board made easy to connect the uSDR via USB as well as some additional features:
Six GPIOs exposed to an FPC cable, along with 1.8 V
TX harmonic-reduction filter for 2.3 - 3.7 GHz
RX LPF at 3.5 GHz
A connector for an external reference clock
Exposed JTAG pads for a JTAG-HS2 adapter
Mounting holes for a heatsink or enclosure
Connections
J7 - Harmonic Filter(2.3 - 3.7 GHz) - TX SMA
J6 - Low Pass Filter(3.5 GHz) - RX SMA
Central connector - direct to SMA: Usable to connect uSDR HF RX