increased allowed MAX2837 frequency range from 2300-2700 MHz to 2150-2750 MHz based on experimentation
reduced minimum tuning frequency from 5 MHz to 0 Hz
increased maximum tuning frequency from 6800 MHz to 7250 MHz
high-side injection and graduated IF for tuning from 0 to 2150 MHz
removed check for too low tuning frequency now that we permit tuning down to 0 Hz
divided tuning frequencies above 2750 MHz into three ranges with graduated IF for spur avoidance
fixed bug with high-side injection tuning
reverted to low-side injection until/unless inverted spectrum is resolved
Merge pull request #108 from scateu/master

Add Plastic Case design for HackRF One