All, Added the PSK FEC-31 mode to the list of modes I've been testing with Moe Wheatley's HF path simulator.
Throughput appears to be somewhat slower than PSK31, but sensitivity seems to be better. It's ability to print through rough conditions is about the same as what you'd find with other narrow-band PSK modes. See below... Tony - K2MO ___________________________________________ Sensitivity Test - Direct Path (no ionospheric disturbance) Minimum SNR for error-free copy Contestia 500/32............-15db DominoEX-4 ..................-15db FEC-31.......................-15db THROBX-4......................-15db MFSK16...........................-14db THOR11...........................-14db RTTYM**...........................-13db Contestia 500/16............-13db CW 20 WPM...................-13db*** THOR16...........................-12db Olivia 500/16 ................. -12db MFSK31*........................-12db Olivia 500/8.....................-10db PSK31............................ -10db DominoEX-11...................-8db MT63 1K............................-8db Olivia 500/4...................... -8db PSK63..............................-7db Feld Hell............................-7db RTTY 45............................-5db * MFSK 31.25 baud. MMVARI Software. ** Intermittent decode problem with RTTYM regardless of SNR *** Subjective - speed dictates SNR ______________________________________________ Sensitivity Test - Direct Path -12db SNR (no ionospheric disturbance) Percentage of decode for modes with SNR threshold above -12db Olivia 500/8.... ...................90% Olivia 500/4........................90% DominoEX 11....................90% PSK31................................90% PSK63................................20% Feld Hell............................readable MT63 1K...........................no copy RTTY 45 baud..................no copy _______________________________________________________ Sensitivity Test - Direct Path (no ionospheric disturbance) Percentage of decoded text for modes with SNR threshold above -15db MFSK16.......................95% Contestia 500/32.........95% Olivia 500/16...............90% Thor11..........................80% RTTYM..........................80% Contestia 500/16.......<50% DominoEX 11bd........<50% Olivia 500/8.............. <50% MFSK31....................<50% PSK31........................<50% Feld Hell......................No Copy MT63...........................No Copy Olivia 500/4................No Copy PSK63........................No Copy RTTY 45......................No Copy THOR16......................No Copy _______________________________________________________________ High-Latitude Moderate Disturbance - 3ms path delay - frequency spread 10Hz - SNR -8db) Contestia 500/16........100% CW 20 WPM...............100% MFSK16......................100% MFSK31**...................100% Olivia 500/16...............100% Olivia 500/8..................100% RTTYM 500/32.............100% Olivia 500/4....................90% Feld Hell..................... ...90%* ThrobX-4........................70% DominoEX 4bd..........No Copy DominoEX 11bd........No Copy FEC-31................No Copy PSK31.........................No Copy PSK63.........................No Copy RTTY45........................No Copy THOR-11.....................No Copy THOR-16.....................No Copy MT63............................No Copy *diffuse print - readable ** MFSK 31.25 baud MMVARI Software. _______________________________________________________ High-Latitude Disturbed - 7ms path delay - frequency spread 30Hz - SNR -3db ) Contestia 500/16.......100% CW 20 WPM..............100% Olivia 500/16..............100% Olivia 500/8.................100% Olivia 500/4..................95% RTTYM..........................95%** MFSK31...................... 90% MFSK16.......................75% RTTY..............................40% DominoEX-4..............no copy FEC-31...................no copy MT631K......................no copy PSK31........................no copy PSK63........................no copy Thor-11.......................no copy ThrobX-4....................no copy Feld Hell.....................readable * * diffuse print - readable ** Intermittent decode problem with RTTYM ________________________________________________________ Mid-Latitude Disturbed - 2ms path delay - frequency spread 1Hz - SNR -8db) Contestia 500/16.......100% MFSK16.....................100% Olivia 500/16..............100% CW 20 WPM................90%* DominoEX 4bd............90% Feld Hell........................90% MFSK31 ....................90% MT63 1K.......................90% Olivia 500/8..................90% Olivia 500/4..................90% RTTYM 500/32.............90% ThrobX-4.......................90% DominoEX 11bd..........80% Thor-11..........................80% FEC-31...........................70% Thor-16..........................70% PSK31...........................70% PSK63...........................50% RTTY45.........................20% * Missing Morse elements due to selective fading ______________________________________________________________ Low-Latitude Disturbed - 6ms path delay - frequency spread 10Hz - SNR -8db) Contestia 500/16.....100% MFSK16...................100% MFSK31...................100% Olivia 500/16............100% RTTYM 500/32..........100% CW 20 WPM..............90% Olivia 500/8................90% Olivia 500/4................90% Throbx-4......................70% Feld Hell....................Poor Copy* DominoEX 4bd .......No Copy DominoEX 11bd......No Copy FEC-31.....................No Copy MT63 1k....................No Copy PSK31......................No Copy PSK63......................No Copy RTTY45.....................No Copy Thor-11bd.................No Copy Thor-16bd.................No Copy * Characters diffuse difficult to read. Readability improves with increased SNR
