RGO One V6 DSP audio filter board

Audio filter (AF) option is a small board located on IF/AF board. 

Here are some of the new AF (audio filter) option features available with proper firmware in RGO One V6:

• Digital signal processing (DSP) architecture based on ADI Sigma studio chip.
• 12 low pass and 7 high pass high order (6th order) filters automatically selected by the software. Audio filter bandwidth follows current IF bandwidth and pitch on CW. If narrow filter Jones – 4 pole is engaged and in line firmware adjusts LPF and HPF frequencies accordingly. (BW position B01 – B10 and OFF)
• APF – audio peak filter feature. This is high Q parametric filter resonating at pitch frequency (±30Hz). It boosts up received signal with three adjustable levels – 8db 10db and 12db. Can be switched off and on. APF makes faint signals popping up well on the noise level.
• NR noise reduction function based on ADI noise removal digital algorithm. Adjustable level of action.
• NOTCH/AUTONOTCH function – works according to the bandwidth in use. AUTONOTCH works only for BW<1200Hz. Manual NOTCH frequency is adjusted by rotating ENC.3 RIT/XIT. AUTONOTCH feature is activated by long press of ENC.3 button.
• CW TUNE / AUTOTUNE. This is useful CW aid function for ZERO beat or CW pitch match tuning. RIT/XIT LED glows/flickers in green when the pitch frequency locks. Short click on ENC.3 (RIT/XIT) initiates auto tune procedure which takes a second to tune the frequency to received CW signal. Auto tune won’t work if the signal is more than ±100Hz away from current VFO frequency. Weak signals bellow -121dBm won’t trigger CW autotuner.