Here isYaesu's FT-991A HF, C4FM VHF and UHF Shack in a box! Lightly used for about a year. The 32bit high speed floating point DSP provides effective cancellation and reduction (DNR) of random noise, and the Auto Notch (DNF) automatically eliminates QRM caused by dominant beat tones while the receiver’s Contour function and APF (Audio Peak Filter) can be used to further reduce undesired noise.