# Mode definitions for KA9Q software receiver - Oct 2017

# Name - name of mode

# Demod - Demodulator thread: FM or LINEAR

# FM - frequency demodulation by complex arctangent, with suppression of weak samples for threshold extension

# AM - amplitude demodulation by envelope detection

# LINEAR - everything else: CW/SSB, coherent AM, DSB/BPSK, ISB (can also do envelope detection)

# Filter high and low - digital IF bandpass filter frequency limits

# Offset - frequency shift applied *after* filtering; carrier, normally at zero, will come out at specified offset; N/A to FM and envelope detection

# AGC attack - AGC attack rate, dB/s (negative); N/A to FM

# AGC recovery - AGC recovery rate, dB/s (positive); N/A to FM

# agc hang - AGC hang time before recovery, sec; N/A to FM

# flags:

# flat - bypass de-emphasis and PL tone removal (FM only)

# conj - cross-combine the complex conjugates of the upper and lower sidebands - for ISB (independent sideband) (linear only)

# mono - send only I channel as mono; otherwise stereo with I on left and Q on right (linear only, others are inherently mono)

# pll - Acquire and coherently track carrier; without "square", uses conventional PLL (linear only)

# square - square signal before coherent tracking (for suppressed carrier DSB and BPSK) (linear only)

# cal - special calibrate mode for WWV/CHU: adjusts TCXO offset to bring measured carrier offset to zero (implies pll) (linear only)

# Name Demod Filter low Filter high Offset agc attack agc recovery agc hang flags comments

# bandwidth symmetric modes

FM FM -8000 +8000 0 0 0 0 # standard NBFM (PM) -6dB/oct de-emphasis, PL removal

FMF FM -8000 +8000 0 0 0 0 flat # pure FM, no post-detection filtering

AM AM -5000 +5000 0 -50 +50 0.0 # standard AM envelope detection

CAM LINEAR -5000 +5000 0 -50 +50 0.0 pll mono # Coherently track carrier (AM, low mod PM)

DSB LINEAR -5000 +5000 0 -50 +6 1.1 square mono # Square to regenerate suppressed carrier

IQ LINEAR -5000 +5000 0 -50 +6 1.1 # Left = I, Right = Q, no tracking

ISB LINEAR -5000 +5000 0 -50 +6 1.1 conj # add/subtract conjugates of +/- freqs

CISB LINEAR -5000 +5000 0 -50 +6 1.1 pll conj # is there such a thing?

# Bandwidth asymmetric (SSB/VSB) modes

CWU LINEAR -200 +200 +700 -50 +20 0.2 mono # dial freq is for +700 Hz tone

CWL LINEAR -200 +200 -700 -50 +20 0.2 mono # dial freq is for -700 Hz tone

USB LINEAR +100 +3000 0 -50 +6 1.1 mono

LSB LINEAR -3000 -100 0 -50 +6 1.1 mono

AME LINEAR 0 +3000 0 -50 +15 0.0 pll mono # enhanced (full carrier) USB AM for CHU

# stereo versions of above

# puts Q channel on right ear

# for asymmetrical filter modes like CW, SSB and AMES, the right channel gets the hilbert transform of the main (I) channel

# for coherent DSB symmetrical filter modes like CALS, DSBS, CAMS, a locked carrier loop should put noise on the right (Q) channel

# commented out for now to delitter the screen

#CWUS LINEAR -200 +200 +700 -50 +20 0.5 # dial freq is for +700 Hz tone

#CWLS LINEAR -200 +200 -700 -50 +20 0.5 # dial freq is for -700 Hz tone

#USBS LINEAR +100 +3000 0 -50 +6 1.1

#LSBS LINEAR -3000 -100 0 -50 +6 1.1

#CAMS LINEAR -5000 +5000 0 -50 +50 0.5 pll # Coherently track carrier (AM, low mod PM)

#DSBS LINEAR -5000 +5000 0 -50 +6 1.1 square # Square to regenerate suppressed carrier

#AMES LINEAR -100 +3000 0 -50 +15 0.5 pll # enhanced (full carrier) USB AM for CHU