thanks for the hint. SDR-Console supports an USB-Relay meanwhile, so switching the supply is simple but not very elegant. The LimeSDR Mini gives approx. 0 dBm, the total current to the amp. is about 2 Amps.
At present, I use all the equipment in a portable way, the dissipation is limited. But for longer standby a switch off of the idle current is useful. The picture shows the "Radio" below the laptop.
Beautiful design.Does the limesdr mini work properly on the usb hub?