Improvements

[tavi343]

Hello,

I've successfully run the software under Ubuntu 18.04. I've try to enlarge the window but the size remain the same. I need a little bigger font. I will change it in the code if you guide me.

Also, if you can make it to work with other SDR with better ADC, faster and large bandwidth it will be very useful. It is too complicated for me to change the code to run with soapy_power instead of rtlpower. I've used soapy_power with Airspy R2 and bladeRF with better results than RTL-SDR.