I wish to share with you my experience with the combination of USB2SDR / UHFSDR.
UHFSDR wiring, using the installation instructions and control is easy and quickly becomes a plaisir. J've used for testing the USB2SDR: Si570; for the test is working properly, use a cable as short as possible between both cards for the link I2c.
After a laborious handling of PowerSDR due to my English "Beginner", the use of USB2SDR with UHFSDR is simple and performance is outstanding.
73's Jean Marie,