# USB Hub with software controllable power supply for SDR **URL:** \ **Category:** GNU Radio\ **Created:** [May 7, 2014, 8:15am UTC](https://www.ruby-forum.com/t/usb-hub-with-software-controllable-power-supply-for-sdr/240928 "2014-05-07T08:15:13Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Post date:** [May 7, 2014, 8:15am UTC](https://www.ruby-forum.com/t/usb-hub-with-software-controllable-power-supply-for-sdr/240928/1 "2014-05-07T08:15:13Z")
Hi all, I’m looking for a USB hub that allows software control of each port. I have a FunCube Dongle Pro+ trying to pick up satellite signals; but as the dongle is plugged in continously, I believe it heats up and degrades SNR. Let me know if you can think of any solutions Vanush ---
**Author:** ![Vanush\_V](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/ce7236/32.png) [@Vanush\_V](https://www.ruby-forum.com/u/Vanush_V)\ **Post date:** [May 7, 2014, 10:51am UTC](https://www.ruby-forum.com/t/usb-hub-with-software-controllable-power-supply-for-sdr/240928/2 "2014-05-07T10:51:59Z")
Hi Vanush, turning the device off sounds like an odd solution for a temperature problem. Also, usually you’re experiencing frequency drift with temperature, which can, if your receiver architecture can’t correct, will lead to degraded SNR. Thermal noise will only significantly increase if the temperature shift is not negligible compared to the effective equiv. noise temperatures of your system, which /should/ be dominated by the first amplifier stage. So if I’d suggest anything, it would be just adding a cooler/fan/peltier element to that, and see if your performance measurably increases, just to verify it’s a temperature problem at all. Greetings, Marcus