diff --git a/CHANGES.md b/CHANGES.md
index b22e3b3..d1ff7b3 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -15,6 +15,8 @@
- "-g" option to force G3RUH mode for lower speeds where a different modem type may be the default.
+- 2400 bps compatibility with MFJ-2400. See ***2400-4800-PSK-for-APRS-Packet-Radio.pdf*** for details
+
- "atest -h" will display the frame in hexadecimal for closer inspection.
- Add support for Multi-GNSS NMEA sentences.
diff --git a/Makefile.linux b/Makefile.linux
index d695f92..591526d 100644
--- a/Makefile.linux
+++ b/Makefile.linux
@@ -735,7 +735,7 @@ install-rpi :
# Combine some unit tests into a single regression sanity check.
-check : dtest ttest tttexttest pftest tlmtest lltest enctest kisstest pad2test xidtest dtmftest check-modem1200 check-modem300 check-modem9600 check-modem19200 check-modem2400 check-modem2400-g check-modem4800
+check : dtest ttest tttexttest pftest tlmtest lltest enctest kisstest pad2test xidtest dtmftest check-modem1200 check-modem300 check-modem9600 check-modem19200 check-modem2400-a check-modem2400-b check-modem2400-g check-modem4800
# Can we encode and decode at popular data rates?
@@ -763,11 +763,17 @@ check-modem19200 : gen_packets atest
./atest -B19200 -F1 -L64 -G68 /tmp/test19.wav
rm /tmp/test19.wav
-check-modem2400 : gen_packets atest
- ./gen_packets -B2400 -n 100 -o /tmp/test24.wav
- ./atest -B2400 -F0 -L70 -G78 /tmp/test24.wav
- ./atest -B2400 -F1 -L80 -G87 /tmp/test24.wav
- rm /tmp/test24.wav
+check-modem2400-a : gen_packets atest
+ ./gen_packets -B2400 -j -n 100 -o /tmp/test24-a.wav
+ ./atest -B2400 -j -F0 -L76 -G80 test24-a.wav
+ ./atest -B2400 -j -F1 -L84 -G88 test24-a.wav
+ rm /tmp/test24-a.wav
+
+check-modem2400-b : gen_packets atest
+ ./gen_packets -B2400 -J -n 100 -o /tmp/test24-b.wav
+ ./atest -B2400 -J -F0 -L79 -G83 test24-b.wav
+ ./atest -B2400 -J -F1 -L87 -G91 test24-b.wav
+ rm /tmp/test24-b.wav
check-modem2400-g : gen_packets atest
./gen_packets -B2400 -g -n 100 -o /tmp/test24-g.wav
diff --git a/Makefile.win b/Makefile.win
index 51f3519..44f9855 100644
--- a/Makefile.win
+++ b/Makefile.win
@@ -277,7 +277,7 @@ strlcat.o : misc/strlcat.c
# Combine some unit tests into a single regression sanity check.
-check : dtest ttest tttexttest pftest tlmtest lltest enctest kisstest pad2test xidtest dtmftest check-modem1200 check-modem300 check-modem9600 check-modem19200 check-modem2400 check-modem2400-g check-modem4800
+check : dtest ttest tttexttest pftest tlmtest lltest enctest kisstest pad2test xidtest dtmftest check-modem1200 check-modem300 check-modem9600 check-modem19200 check-modem2400-a check-modem2400-b check-modem2400-g check-modem4800
# Can we encode and decode at popular data rates?
# Verify that single bit fixup increases the count.
@@ -324,13 +324,21 @@ check-modem19200 : gen_packets atest
sleep 1
rm test19.wav
-check-modem2400 : gen_packets atest
- gen_packets -B2400 -n 100 -o test24.wav
+check-modem2400-a : gen_packets atest
+ gen_packets -B2400 -j -n 100 -o test24-a.wav
sleep 1
- atest -B2400 -F0 -L70 -G78 test24.wav
- atest -B2400 -F1 -L80 -G87 test24.wav
+ atest -B2400 -j -F0 -L76 -G80 test24-a.wav
+ atest -B2400 -j -F1 -L84 -G88 test24-a.wav
sleep 1
- rm test24.wav
+ rm test24-a.wav
+
+check-modem2400-b : gen_packets atest
+ gen_packets -B2400 -J -n 100 -o test24-b.wav
+ sleep 1
+ atest -B2400 -J -F0 -L79 -G83 test24-b.wav
+ atest -B2400 -J -F1 -L87 -G91 test24-b.wav
+ sleep 1
+ rm test24-b.wav
check-modem2400-g : gen_packets atest
gen_packets -B2400 -g -n 100 -o test24-g.wav
@@ -518,8 +526,8 @@ testagc96 : atest.c fsk_fast_filter.h tune.h demod.c demod_afsk.c demod_psk.c de
misc.a regex.a
rm -f atest96.exe
$(CC) $(CFLAGS) -o atest96 $^
- ./atest96 -B 9600 ../walkabout9600c.wav | grep "packets decoded in" >atest.out
- #./atest96 -B 9600 ../walkabout9600c.wav noisy96.wav zzz16.wav zzz16.wav zzz16.wav zzz8.wav zzz8.wav zzz8.wav | grep "packets decoded in" >atest.out
+ ./atest96 -B 9600 ../walkabout9600c.wav noisy96.wav zzz16.wav zzz16.wav zzz16.wav zzz8.wav zzz8.wav zzz8.wav | grep "packets decoded in" >atest.out
+ #./atest96 -B 9600 ../walkabout9600c.wav | grep "packets decoded in" >atest.out
#./atest96 -B 9600 zzz16.wav zzz8.wav | grep "packets decoded in" >atest.out
#./atest96 -B 9600 noisy96.wav | grep "packets decoded in" >atest.out
#./atest96 -B 9600 19990303_0225_9600_8bis_22kHz.wav | grep "packets decoded in" >atest.out
@@ -536,10 +544,22 @@ testagc24 : atest.c fsk_fast_filter.h tune.h demod.c demod_afsk.c demod_psk.c de
misc.a regex.a
rm -f atest24.exe
sleep 1
- $(CC) $(CFLAGS) -o atest24 $^
+ $(CC) $(CFLAGS) -o atest24mfj $^
./atest24 -B 2400 test2400.wav | grep "packets decoded in" >atest.out
echo " " > tune.h
+testagc24mfj : atest.c fsk_fast_filter.h tune.h demod.c demod_afsk.c demod_psk.c demod_9600.c \
+ dsp.o hdlc_rec.o hdlc_rec2.o multi_modem.o \
+ rrbb.o fcs_calc.o ax25_pad.o decode_aprs.o \
+ dwgpsnmea.o dwgps.o serial_port.o latlong.o \
+ symbols.o tt_text.o textcolor.o telemetry.o dtime_now.o \
+ misc.a regex.a
+ rm -f atest24mfj.exe
+ sleep 1
+ $(CC) $(CFLAGS) -o atest24mfj $^
+ ./atest24mfj -F 1 -B 2400 ../ref-doc/MFJ-2400-PSK/2k4_short.wav
+ echo " " > tune.h
+
testagc48 : atest.c fsk_fast_filter.h tune.h demod.c demod_afsk.c demod_psk.c demod_9600.c \
dsp.o hdlc_rec.o hdlc_rec2.o multi_modem.o \
rrbb.o fcs_calc.o ax25_pad.o decode_aprs.o \
diff --git a/atest.c b/atest.c
index 91b5114..d68764b 100644
--- a/atest.c
+++ b/atest.c
@@ -2,7 +2,7 @@
//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
-// Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016 John Langner, WB2OSZ
+// Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016, 2019 John Langner, WB2OSZ
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
@@ -182,7 +182,10 @@ static int sample_number = -1; /* Sample number from the file. */
static int B_opt = DEFAULT_BAUD; // Bits per second. Need to change all baud references to bps.
static int g_opt = 0; // G3RUH modem regardless of speed.
+static int j_opt = 0; /* 2400 bps PSK compatible with direwolf <= 1.5 */
+static int J_opt = 0; /* 2400 bps PSK compatible MFJ-2400 and maybe others. */
static int h_opt = 0; // Hexadecimal display of received packet.
+static char P_opt[16] = ""; // Demodulator profiles.
int main (int argc, char *argv[])
@@ -219,49 +222,6 @@ int main (int argc, char *argv[])
my_audio_config.adev[0].samples_per_sec = DEFAULT_SAMPLES_PER_SEC;
my_audio_config.adev[0].bits_per_sample = DEFAULT_BITS_PER_SAMPLE;
- // Results v0.9:
- //
- // fix_bits = 0 971 packets, 69 sec
- // fix_bits = SINGLE 990 64
- // fix_bits = DOUBLE 992 65
- // fix_bits = TRIPLE 992 67
- // fix_bits = TWO_SEP 1004 476
-
- // Essentially no difference in time for those with order N time.
- // Time increases greatly for the one with order N^2 time.
-
-
- // Results: version 1.1, decoder C, my_audio_config.fix_bits = RETRY_MAX - 1
- //
- // 971 NONE
- // +19 SINGLE
- // +2 DOUBLE
- // +12 TWO_SEP
- // +3 REMOVE_MANY
- // ----
- // 1007 Total in 1008 sec. More than twice as long as earlier version.
-
- // Results: version 1.1, decoders ABC, my_audio_config.fix_bits = RETRY_MAX - 1
- //
- // 976 NONE
- // +21 SINGLE
- // +1 DOUBLE
- // +22 TWO_SEP
- // +1 MANY
- // +3 REMOVE_MANY
- // ----
- // 1024 Total in 2042 sec.
- // About 34 minutes of CPU time for a roughly 40 minute CD.
- // Many computers wouldn't be able to keep up.
-
- // The SINGLE and TWO_SEP techniques are the most effective.
- // Should we reorder the enum values so that TWO_SEP
- // comes after SINGLE? That way "FIX_BITS 2" would
- // use the two most productive techniques and not waste
- // time on the others. People with plenty of CPU power
- // to spare can still specify larger numbers for the other
- // techniques with less return on investment.
-
for (channel=0; channel<MAX_CHANS; channel++) {
@@ -299,7 +259,7 @@ int main (int argc, char *argv[])
/* ':' following option character means arg is required. */
- c = getopt_long(argc, argv, "B:P:D:U:gF:L:G:012h",
+ c = getopt_long(argc, argv, "B:P:D:U:gjJF:L:G:012h",
long_options, &option_index);
if (c == -1)
break;
@@ -316,10 +276,20 @@ int main (int argc, char *argv[])
g_opt = 1;
break;
+ case 'j': /* -j V.26 compatible with earlier direwolf. */
+
+ j_opt = 1;
+ break;
+
+ case 'J': /* -J V.26 compatible with MFJ-2400. */
+
+ J_opt = 1;
+ break;
+
case 'P': /* -P for modem profile. */
- dw_printf ("Demodulator profile set to \"%s\"\n", optarg);
- strlcpy (my_audio_config.achan[0].profiles, optarg, sizeof(my_audio_config.achan[0].profiles));
+ // Wait until after other options processed.
+ strlcpy (P_opt, optarg, sizeof(P_opt));
break;
case 'D': /* -D reduce sampling rate for lower CPU usage. */
@@ -353,7 +323,7 @@ int main (int argc, char *argv[])
my_audio_config.achan[0].upsample = upsample;
break;
- case 'F': /* -D set "fix bits" level. */
+ case 'F': /* -F set "fix bits" level. */
my_audio_config.achan[0].fix_bits = atoi(optarg);
@@ -411,7 +381,7 @@ int main (int argc, char *argv[])
/*
* Set modem type based on data rate.
- * (Could be overridden by -g later.)
+ * (Could be overridden by -g, -j, or -J later.)
*/
/* 300 implies 1600/1800 AFSK. */
/* 1200 implies 1200/2200 AFSK. */
@@ -478,6 +448,40 @@ int main (int argc, char *argv[])
strlcpy (my_audio_config.achan[0].profiles, " ", sizeof(my_audio_config.achan[0].profiles)); // avoid getting default later.
}
+/*
+ * We have two different incompatible flavors of V.26.
+ */
+ if (j_opt) {
+
+ // V.26 compatible with earlier versions of direwolf.
+ // Example: -B 2400 -j or simply -j
+
+ my_audio_config.achan[0].v26_alternative = V26_A;
+ my_audio_config.achan[0].modem_type = MODEM_QPSK;
+ my_audio_config.achan[0].mark_freq = 0;
+ my_audio_config.achan[0].space_freq = 0;
+ my_audio_config.achan[0].baud = 2400;
+ strlcpy (my_audio_config.achan[0].profiles, "", sizeof(my_audio_config.achan[0].profiles));
+ }
+ if (J_opt) {
+
+ // V.26 compatible with MFJ and maybe others.
+ // Example: -B 2400 -J or simply -J
+
+ my_audio_config.achan[0].v26_alternative = V26_B;
+ my_audio_config.achan[0].modem_type = MODEM_QPSK;
+ my_audio_config.achan[0].mark_freq = 0;
+ my_audio_config.achan[0].space_freq = 0;
+ my_audio_config.achan[0].baud = 2400;
+ strlcpy (my_audio_config.achan[0].profiles, "", sizeof(my_audio_config.achan[0].profiles));
+ }
+
+ // Needs to be after -B, -j, -J.
+ if (strlen(P_opt) > 0) {
+ dw_printf ("Demodulator profile set to \"%s\"\n", P_opt);
+ strlcpy (my_audio_config.achan[0].profiles, P_opt, sizeof(my_audio_config.achan[0].profiles));
+ }
+
memcpy (&my_audio_config.achan[1], &my_audio_config.achan[0], sizeof(my_audio_config.achan[0]));
@@ -879,11 +883,15 @@ static void usage (void) {
dw_printf (" atest [ options ] wav-file-in\n");
dw_printf ("\n");
dw_printf (" -B n Bits/second for data. Proper modem automatically selected for speed.\n");
- dw_printf (" 300 baud uses 1600/1800 Hz AFSK.\n");
- dw_printf (" 1200 (default) baud uses 1200/2200 Hz AFSK.\n");
- dw_printf (" 9600 baud uses K9NG/G2RUH standard.\n");
+ dw_printf (" 300 bps defaults to AFSK tones of 1600 & 1800.\n");
+ dw_printf (" 1200 bps uses AFSK tones of 1200 & 2200.\n");
+ dw_printf (" 2400 bps uses QPSK based on V.26 standard.\n");
+ dw_printf (" 4800 bps uses 8PSK based on V.27 standard.\n");
+ dw_printf (" 9600 bps and up uses K9NG/G3RUH standard.\n");
dw_printf ("\n");
- dw_printf (" -g Force G3RUH modem rather rather than default for data rate.\n");
+ dw_printf (" -g Use G3RUH modem rather rather than default for data rate.\n");
+ dw_printf (" -j 2400 bps QPSK compatible with direwolf <= 1.5.\n");
+ dw_printf (" -J 2400 bps QPSK compatible with MFJ-2400.\n");
dw_printf ("\n");
dw_printf (" -D n Divide audio sample rate by n.\n");
dw_printf ("\n");
@@ -894,8 +902,12 @@ static void usage (void) {
dw_printf (" 1 = Try to fix only a single bit. \n");
dw_printf (" more = Try modifying more bits to get a good CRC.\n");
dw_printf ("\n");
- dw_printf (" -P m Select the demodulator type such as A, B, C, D (default for 300 baud),\n");
- dw_printf (" E (default for 1200 baud), F, A+, B+, C+, D+, E+, F+.\n");
+ dw_printf (" -L Error if less than this number decoded.\n");
+ dw_printf ("\n");
+ dw_printf (" -G Error if greater than this number decoded.\n");
+ dw_printf ("\n");
+ dw_printf (" -P m Select the demodulator type such as D (default for 300 bps),\n");
+ dw_printf (" E+ (default for 1200 bps), PQRS for 2400 bps, etc.\n");
dw_printf ("\n");
dw_printf (" -0 Use channel 0 (left) of stereo audio (default).\n");
dw_printf (" -1 use channel 1 (right) of stereo audio.\n");
@@ -918,11 +930,11 @@ static void usage (void) {
dw_printf (" bits per second.\n");
dw_printf ("\n");
dw_printf (" atest 02_Track_2.wav\n");
- dw_printf (" atest -P C+ 02_Track_2.wav\n");
+ dw_printf (" atest -P E- 02_Track_2.wav\n");
dw_printf (" atest -F 1 02_Track_2.wav\n");
- dw_printf (" atest -P C+ -F 1 02_Track_2.wav\n");
+ dw_printf (" atest -P E- -F 1 02_Track_2.wav\n");
dw_printf ("\n");
- dw_printf (" Try different combinations of options to find the best decoding\n");
+ dw_printf (" Try different combinations of options to compare decoding\n");
dw_printf (" performance.\n");
exit (1);
diff --git a/audio.h b/audio.h
index b427cfe..0cda022 100644
--- a/audio.h
+++ b/audio.h
@@ -18,7 +18,7 @@
#include "direwolf.h" /* for MAX_CHANS used throughout the application. */
#include "ax25_pad.h" /* for AX25_MAX_ADDR_LEN */
-
+#include "version.h"
/*
@@ -141,6 +141,20 @@ struct audio_s {
/* Might try MFJ-2400 / CCITT v.26 / Bell 201 someday. */
/* No modem. Might want this for DTMF only channel. */
+ enum v26_e { V26_UNSPECIFIED=0, V26_A, V26_B } v26_alternative;
+
+ // Original implementaion used alternative A for 2400 bbps PSK.
+ // Years later, we discover that MFJ-2400 used alternative B.
+ // It's likely the others did too.
+ // For release 1.6, default to original style but print warning.
+ // Later default to MFJ compatible and still print warning if
+ // if user did not pick one explicitly.
+
+#if (MAJOR_VERSION > 1) || (MINOR_VERSION > 6)
+#define V26_DEFAULT V26_B
+#else
+#define V26_DEFAULT V26_A
+#endif
enum dtmf_decode_t { DTMF_DECODE_OFF, DTMF_DECODE_ON } dtmf_decode;
diff --git a/config.c b/config.c
index 348618e..9d6c083 100644
--- a/config.c
+++ b/config.c
@@ -761,6 +761,7 @@ void config_init (char *fname, struct audio_s *p_audio_config,
/* set to radio when corresponding */
/* audio device is defined. */
p_audio_config->achan[channel].modem_type = MODEM_AFSK;
+ p_audio_config->achan[channel].v26_alternative = V26_UNSPECIFIED;
p_audio_config->achan[channel].mark_freq = DEFAULT_MARK_FREQ; /* -m option */
p_audio_config->achan[channel].space_freq = DEFAULT_SPACE_FREQ; /* -s option */
p_audio_config->achan[channel].baud = DEFAULT_BAUD; /* -b option */
@@ -1264,6 +1265,7 @@ void config_init (char *fname, struct audio_s *p_audio_config,
* *9 - Upsample ratio for G3RUH.
* [A-Z+-]+ - Letters, plus, minus for the demodulator "profile."
* g3ruh - This modem type regardless of default for speed.
+ * v26a or v26b - V.26 alternative. a=original, b=MFJ compatible
*/
else if (strcasecmp(t, "MODEM") == 0) {
@@ -1540,6 +1542,19 @@ void config_init (char *fname, struct audio_s *p_audio_config,
p_audio_config->achan[channel].space_freq = 0;
}
+ else if (strcasecmp(t, "V26A") == 0 || /* Compatible with direwolf versions <= 1.5. New in 1.6. */
+ strcasecmp(t, "V26B") == 0) { /* Compatible with MFJ-2400. New in 1.6. */
+
+ if (p_audio_config->achan[channel].modem_type != MODEM_QPSK ||
+ p_audio_config->achan[channel].baud != 2400) {
+
+ text_color_set(DW_COLOR_ERROR);
+ dw_printf ("Line %d: %s option can only be used with 2400 bps PSK.\n", line, t);
+ continue;
+ }
+ p_audio_config->achan[channel].v26_alternative = (strcasecmp(t, "V26A") == 0) ? V26_A : V26_B;
+ }
+
else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Line %d: Unrecognized option for MODEM: %s\n", line, t);
diff --git a/demod.c b/demod.c
index baa28db..312123b 100644
--- a/demod.c
+++ b/demod.c
@@ -1,7 +1,7 @@
//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
-// Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016 John Langner, WB2OSZ
+// Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016, 2019 John Langner, WB2OSZ
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
@@ -94,7 +94,6 @@ static int sample_count[MAX_CHANS][MAX_SUBCHANS];
int demod_init (struct audio_s *pa)
{
- //int j;
int chan; /* Loop index over number of radio channels. */
char profile;
@@ -520,6 +519,31 @@ int demod_init (struct audio_s *pa)
case MODEM_QPSK: // New for 1.4
+ // In versions 1.4 and 1.5, V.26 "Alternative A" was used.
+ // years later, I discover that the MFJ-2400 used "Alternative B."
+ // It looks like the other two manufacturers use the same but we
+ // can't be sure until we find one for compatbility testing.
+
+ // In version 1.6 we add a choice for the user.
+ // If neither one was explicitly specified, print a message and take
+ // a default. My current thinking is that we default to direwolf <= 1.5
+ // compatible for version 1.6 and MFJ compatible after that.
+
+ if (save_audio_config_p->achan[chan].v26_alternative == V26_UNSPECIFIED) {
+
+ text_color_set(DW_COLOR_ERROR);
+ dw_printf ("Two incompatible versions of 2400 bps QPSK are now available.\n");
+ dw_printf ("For compatbility with direwolf <= 1.5, use 'V26A' modem option in config file.\n");
+ dw_printf ("For compatbility MFJ-2400 use 'V26B' modem option in config file.\n");
+ dw_printf ("Command line options -j and -J can be used for channel 0.\n");
+ dw_printf ("For more information, read the Dire Wolf User Guide and\n");
+ dw_printf ("2400-4800-PSK-for-APRS-Packet-Radio.pdf.\n");
+ dw_printf ("The default in this release could be different in a later release.\n");
+
+ save_audio_config_p->achan[chan].v26_alternative = V26_DEFAULT;
+ }
+
+
// TODO: See how much CPU this takes on ARM and decide if we should have different defaults.
if (strlen(save_audio_config_p->achan[chan].profiles) == 0) {
@@ -539,6 +563,12 @@ int demod_init (struct audio_s *pa)
save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec);
if (save_audio_config_p->achan[chan].decimate != 1)
dw_printf (" / %d", save_audio_config_p->achan[chan].decimate);
+
+ if (save_audio_config_p->achan[chan].v26_alternative == V26_B)
+ dw_printf (", compatible with MFJ-2400");
+ else
+ dw_printf (", compatible with earlier direwolf");
+
if (save_audio_config_p->achan[chan].dtmf_decode != DTMF_DECODE_OFF)
dw_printf (", DTMF decoder enabled");
dw_printf (".\n");
@@ -556,6 +586,7 @@ int demod_init (struct audio_s *pa)
// save_audio_config_p->achan[chan].modem_type, profile);
demod_psk_init (save_audio_config_p->achan[chan].modem_type,
+ save_audio_config_p->achan[chan].v26_alternative,
save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec / save_audio_config_p->achan[chan].decimate,
save_audio_config_p->achan[chan].baud,
profile,
@@ -610,6 +641,7 @@ int demod_init (struct audio_s *pa)
// save_audio_config_p->achan[chan].modem_type, profile);
demod_psk_init (save_audio_config_p->achan[chan].modem_type,
+ save_audio_config_p->achan[chan].v26_alternative,
save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec / save_audio_config_p->achan[chan].decimate,
save_audio_config_p->achan[chan].baud,
profile,
diff --git a/demod_psk.c b/demod_psk.c
index 3b2a487..1870b7e 100644
--- a/demod_psk.c
+++ b/demod_psk.c
@@ -1,7 +1,7 @@
//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
-// Copyright (C) 2016 John Langner, WB2OSZ
+// Copyright (C) 2016, 2019 John Langner, WB2OSZ
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
@@ -24,6 +24,7 @@
//#define DEBUG4 1 /* capture PSK demodulator output to log files */
+//#define DEBUG5 1 /* Print bit stream */
/*------------------------------------------------------------------
@@ -63,8 +64,7 @@
* http://www.brazoriacountyares.org/winlink-collection/TNC%20manuals/Kantronics/2400_modem_operators_guide@rgf.pdf
*
*
- * The MFJ and AEA both use the EXAR XR-2123 PSK modem chip.
- * The Kantronics has a P423 ???
+ * From what I'm able to gather, they all used the EXAR XR-2123 PSK modem chip.
*
* Can't find the chip specs on the EXAR website so Google it.
*
@@ -79,8 +79,8 @@
* "bis" and "ter" are from Latin for second and third.
* I used the "ter" version which has phase shifts of 0, 90, 180, and 270 degrees.
*
- * There are other references to an alternative B which uses other multiples of 45.
- * The XR-2123 data sheet mentions only multiples of 90. That's what I went with.
+ * There are ealier references to an alternative B which uses other phase shifts offset
+ * by another 45 degrees.
*
* The XR-2123 does not perform the scrambling as specified in V.26 so I wonder if
* the vendors implemented it in software or just left it out.
@@ -161,6 +161,8 @@ static inline float my_atan2f (float y, float x)
*
* Inputs: modem_type - MODEM_QPSK or MODEM_8PSK.
*
+ * v26_alt - V26_A (classic) or V25_B (MFJ compatible)
+ *
* samples_per_sec - Audio sample rate.
*
* bps - Bits per second.
@@ -189,7 +191,7 @@ static inline float my_atan2f (float y, float x)
*
*----------------------------------------------------------------*/
-void demod_psk_init (enum modem_t modem_type, int samples_per_sec, int bps, char profile, struct demodulator_state_s *D)
+void demod_psk_init (enum modem_t modem_type, enum v26_e v26_alt, int samples_per_sec, int bps, char profile, struct demodulator_state_s *D)
{
int correct_baud; // baud is not same as bits/sec here!
int carrier_freq;
@@ -199,6 +201,8 @@ void demod_psk_init (enum modem_t modem_type, int samples_per_sec, int bps, char
memset (D, 0, sizeof(struct demodulator_state_s));
D->modem_type = modem_type;
+ D->v26_alt = v26_alt;
+
D->num_slicers = 1; // Haven't thought about this yet. Is it even applicable?
@@ -210,6 +214,8 @@ void demod_psk_init (enum modem_t modem_type, int samples_per_sec, int bps, char
if (modem_type == MODEM_QPSK) {
+ assert (D->v26_alt != V26_UNSPECIFIED);
+
correct_baud = bps / 2;
// Originally I thought of scaling it to the data rate,
// e.g. 2400 bps -> 1800 Hz, but decided to make it a
@@ -645,7 +651,16 @@ void demod_psk_process_sample (int chan, int subchan, int sam, struct demodulato
id = ((int)((delta / (2.f * (float)M_PI) + 1.f) * 256.f)) & 0xff;
if (D->modem_type == MODEM_QPSK) {
- demod_phase_shift = ((id + 32) >> 6) & 0x3;
+#ifdef TUNE_PSKOFFSET
+ demod_phase_shift = ((id + TUNE_PSKOFFSET) >> 6) & 0x3;
+#else
+ if (D->v26_alt == V26_B) {
+ demod_phase_shift = ((id + 2) >> 6) & 0x3; // MFJ compatible
+ }
+ else {
+ demod_phase_shift = ((id + 32) >> 6) & 0x3; // Classic
+ }
+#endif
}
else {
demod_phase_shift = ((id + 16) >> 5) & 0x7;
@@ -671,25 +686,20 @@ void demod_psk_process_sample (int chan, int subchan, int sam, struct demodulato
if (D->modem_type == MODEM_QPSK) {
-#if 1 // Speed up special case.
- if (I > 0) {
- if (Q > 0)
- demod_phase_shift = 0; /* 0 to 90 degrees, etc. */
- else
- demod_phase_shift = 1;
- }
- else {
- if (Q > 0)
- demod_phase_shift = 3;
- else
- demod_phase_shift = 2;
- }
-#else
- a = my_atan2f(I,Q);
+ float a = my_atan2f(I,Q);
int id = ((int)((a / (2.f * (float)M_PI) + 1.f) * 256.f)) & 0xff;
// 128 compensates for 180 degree phase shift due
// to 1 1/2 carrier cycles per symbol period.
- demod_phase_shift = ((id + 128) >> 6) & 0x3;
+
+#ifdef TUNE_PSKOFFSET
+ demod_phase_shift = ((id + TUNE_PSKOFFSET) >> 6) & 0x3;
+#else
+ if (D->v26_alt == V26_B) {
+ demod_phase_shift = ((id + 98) >> 6) & 0x3; // MFJ compatible
+ }
+ else {
+ demod_phase_shift = ((id + 128) >> 6) & 0x3; // Classic
+ }
#endif
}
else {
@@ -752,7 +762,13 @@ void demod_psk_process_sample (int chan, int subchan, int sam, struct demodulato
} /* end demod_psk_process_sample */
+
+#ifdef TUNE_GRAY
+TUNE_GRAY
+#else
static const int phase_to_gray_v26[4] = {0, 1, 3, 2};
+#endif
+
static const int phase_to_gray_v27[8] = {1, 0, 2, 3, 7, 6, 4, 5};
@@ -813,6 +829,9 @@ inline static void nudge_pll (int chan, int subchan, int slice, int demod_bits,
a * 360 / (2*M_PI), delta * 360 / (2*M_PI), demod_bits, (gray >> 1) & 1, gray & 1);
//dw_printf ("phaseshift=%d, bits= %d %d \n", demod_bits, (gray >> 1) & 1, gray & 1);
+#endif
+#if DEBUG5
+ dw_printf ("%d\n%d\n", (gray >> 1) & 1, gray & 1);
#endif
hdlc_rec_bit (chan, subchan, slice, (gray >> 1) & 1, 0, -1);
hdlc_rec_bit (chan, subchan, slice, gray & 1, 0, -1);
diff --git a/demod_psk.h b/demod_psk.h
index 0f5830d..134b199 100644
--- a/demod_psk.h
+++ b/demod_psk.h
@@ -2,6 +2,6 @@
/* demod_psk.h */
-void demod_psk_init (enum modem_t modem_type, int samples_per_sec, int bps, char profile, struct demodulator_state_s *D);
+void demod_psk_init (enum modem_t modem_type, enum v26_e v26_alt, int samples_per_sec, int bps, char profile, struct demodulator_state_s *D);
void demod_psk_process_sample (int chan, int subchan, int sam, struct demodulator_state_s *D);
diff --git a/direwolf.c b/direwolf.c
index 73fc831..604fe88 100644
--- a/direwolf.c
+++ b/direwolf.c
@@ -1,7 +1,7 @@
//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
-// Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016, 2017 John Langner, WB2OSZ
+// Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2019 John Langner, WB2OSZ
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
@@ -201,6 +201,8 @@ int main (int argc, char *argv[])
int t_opt = 1; /* Text color option. */
int a_opt = 0; /* "-a n" interval, in seconds, for audio statistics report. 0 for none. */
int g_opt = 0; /* G3RUH mode, ignoring default for speed. */
+ int j_opt = 0; /* 2400 bps PSK compatible with direwolf <= 1.5 */
+ int J_opt = 0; /* 2400 bps PSK compatible MFJ-2400 and maybe others. */
int d_k_opt = 0; /* "-d k" option for serial port KISS. Can be repeated for more detail. */
int d_n_opt = 0; /* "-d n" option for Network KISS. Can be repeated for more detail. */
@@ -354,7 +356,7 @@ int main (int argc, char *argv[])
/* ':' following option character means arg is required. */
- c = getopt_long(argc, argv, "P:B:gD:U:c:pxr:b:n:d:q:t:ul:L:Sa:E:T:",
+ c = getopt_long(argc, argv, "P:B:gjJD:U:c:pxr:b:n:d:q:t:ul:L:Sa:E:T:",
long_options, &option_index);
if (c == -1)
break;
@@ -411,6 +413,16 @@ int main (int argc, char *argv[])
g_opt = 1;
break;
+ case 'j': /* -j V.26 compatible with earlier direwolf. */
+
+ j_opt = 1;
+ break;
+
+ case 'J': /* -J V.26 compatible with MFJ-2400. */
+
+ J_opt = 1;
+ break;
+
case 'P': /* -P for modem profile. */
//debug: dw_printf ("Demodulator profile set to \"%s\"\n", optarg);
@@ -691,11 +703,34 @@ int main (int argc, char *argv[])
audio_config.achan[0].space_freq = 0;
}
+ if (j_opt) {
+
+ // V.26 compatible with earlier versions of direwolf.
+ // Example: -B 2400 -j or simply -j
+
+ audio_config.achan[0].v26_alternative = V26_A;
+ audio_config.achan[0].modem_type = MODEM_QPSK;
+ audio_config.achan[0].mark_freq = 0;
+ audio_config.achan[0].space_freq = 0;
+ audio_config.achan[0].baud = 2400;
+ }
+ if (J_opt) {
+
+ // V.26 compatible with MFJ and maybe others.
+ // Example: -B 2400 -J or simply -J
+
+ audio_config.achan[0].v26_alternative = V26_B;
+ audio_config.achan[0].modem_type = MODEM_QPSK;
+ audio_config.achan[0].mark_freq = 0;
+ audio_config.achan[0].space_freq = 0;
+ audio_config.achan[0].baud = 2400;
+ }
+
+
audio_config.statistics_interval = a_opt;
if (strlen(P_opt) > 0) {
/* -P for modem profile. */
- /* TODO: Not yet documented. Should probably since it is consistent with atest. */
strlcpy (audio_config.achan[0].profiles, P_opt, sizeof(audio_config.achan[0].profiles));
}
@@ -1293,6 +1328,9 @@ static void usage (char **argv)
dw_printf (" 4800 bps uses 8PSK based on V.27 standard.\n");
dw_printf (" 9600 bps and up uses K9NG/G3RUH standard.\n");
dw_printf (" -g Force G3RUH modem regardless of speed.\n");
+ dw_printf (" -j 2400 bps QPSK compatible with direwolf <= 1.5.\n");
+ dw_printf (" -J 2400 bps QPSK compatible with MFJ-2400.\n");
+ dw_printf (" -P xxx Modem Profiles.\n");
dw_printf (" -D n Divide audio sample rate by n for channel 0.\n");
dw_printf (" -d Debug options:\n");
dw_printf (" a a = AGWPE network protocol client.\n");
diff --git a/doc/2400-4800-PSK-for-APRS-Packet-Radio.pdf b/doc/2400-4800-PSK-for-APRS-Packet-Radio.pdf
index 077c5ff..4efd364 100644
Binary files a/doc/2400-4800-PSK-for-APRS-Packet-Radio.pdf and b/doc/2400-4800-PSK-for-APRS-Packet-Radio.pdf differ
diff --git a/doc/User-Guide.pdf b/doc/User-Guide.pdf
index f05dbbc..5632798 100644
Binary files a/doc/User-Guide.pdf and b/doc/User-Guide.pdf differ
diff --git a/fsk_demod_state.h b/fsk_demod_state.h
index cb791dd..8e89db7 100644
--- a/fsk_demod_state.h
+++ b/fsk_demod_state.h
@@ -28,6 +28,8 @@ struct demodulator_state_s
*/
enum modem_t modem_type; // MODEM_AFSK, MODEM_8PSK, etc.
+ enum v26_e v26_alt; // Which alternative when V.26.
+
char profile; // 'A', 'B', etc. Upper case.
// Only needed to see if we are using 'F' to take fast path.
@@ -145,6 +147,7 @@ struct demodulator_state_s
float pre_filter[MAX_FILTER_SIZE] __attribute__((aligned(16)));
+
/*
* Kernel for the mark and space detection filters.
*/
@@ -227,6 +230,7 @@ struct demodulator_state_s
float m_valley, s_valley;
float m_amp_prev, s_amp_prev;
+
/*
* For the PLL and data bit timing.
* starting in version 1.2 we can have multiple slicers for one demodulator.
diff --git a/gen_packets.c b/gen_packets.c
index 1b34908..63c3439 100644
--- a/gen_packets.c
+++ b/gen_packets.c
@@ -1,7 +1,7 @@
//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
-// Copyright (C) 2011, 2013, 2014, 2015, 2016 John Langner, WB2OSZ
+// Copyright (C) 2011, 2013, 2014, 2015, 2016, 2019 John Langner, WB2OSZ
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
@@ -164,6 +164,9 @@ int main(int argc, char **argv)
int chan;
int experiment = 0;
+ int g_opt = 0;
+ int j_opt = 0;
+ int J_opt = 0;
/*
* Set up default values for the modem.
@@ -215,7 +218,7 @@ int main(int argc, char **argv)
/* ':' following option character means arg is required. */
- c = getopt_long(argc, argv, "gm:s:a:b:B:r:n:o:z:82M:X",
+ c = getopt_long(argc, argv, "gjJm:s:a:b:B:r:n:o:z:82M:X",
long_options, &option_index);
if (c == -1)
break;
@@ -310,11 +313,17 @@ int main(int argc, char **argv)
case 'g': /* -g for g3ruh scrambling */
- // FIXME: order dependent. -g must come after -B.
+ g_opt = 1;
+ break;
- modem.achan[0].modem_type = MODEM_SCRAMBLE;
- text_color_set(DW_COLOR_INFO);
- dw_printf ("Using scrambled baseband signal rather than AFSK.\n");
+ case 'j': /* -j V.26 compatible with earlier direwolf. */
+
+ j_opt = 1;
+ break;
+
+ case 'J': /* -J V.26 compatible with MFJ-2400. */
+
+ J_opt = 1;
break;
case 'm': /* -m for Mark freq */
@@ -449,6 +458,41 @@ int main(int argc, char **argv)
}
}
+// These must be processed after -B option.
+
+ if (g_opt) { /* -g for g3ruh scrambling */
+
+ modem.achan[0].modem_type = MODEM_SCRAMBLE;
+ text_color_set(DW_COLOR_INFO);
+ dw_printf ("Using G3RUH mode regardless of bit rate.\n");
+ }
+
+ if (j_opt) { /* -j V.26 compatible with earlier direwolf. */
+
+ modem.achan[0].v26_alternative = V26_A;
+ modem.achan[0].modem_type = MODEM_QPSK;
+ modem.achan[0].mark_freq = 0;
+ modem.achan[0].space_freq = 0;
+ modem.achan[0].baud = 2400;
+ }
+
+ if (J_opt) { /* -J V.26 compatible with MFJ-2400. */
+
+ modem.achan[0].v26_alternative = V26_B;
+ modem.achan[0].modem_type = MODEM_QPSK;
+ modem.achan[0].mark_freq = 0;
+ modem.achan[0].space_freq = 0;
+ modem.achan[0].baud = 2400;
+ }
+
+ if (modem.achan[0].modem_type == MODEM_QPSK &&
+ modem.achan[0].v26_alternative == V26_UNSPECIFIED) {
+
+ text_color_set(DW_COLOR_ERROR);
+ dw_printf ("ERROR: Either -j or -J must be specified when using 2400 bps QPSK.\n");
+ usage (argv);
+ exit (1);
+ }
/*
* Open the output file.
@@ -689,6 +733,8 @@ static void usage (char **argv)
dw_printf (" -b <number> Bits / second for data. Default is %d.\n", DEFAULT_BAUD);
dw_printf (" -B <number> Bits / second for data. Proper modem selected for 300, 1200, 2400, 4800, 9600.\n");
dw_printf (" -g Scrambled baseband rather than AFSK.\n");
+ dw_printf (" -j 2400 bps QPSK compatible with direwolf <= 1.5.\n");
+ dw_printf (" -J 2400 bps QPSK compatible with MFJ-2400.\n");
dw_printf (" -m <number> Mark frequency. Default is %d.\n", DEFAULT_MARK_FREQ);
dw_printf (" -s <number> Space frequency. Default is %d.\n", DEFAULT_SPACE_FREQ);
dw_printf (" -r <number> Audio sample Rate. Default is %d.\n", DEFAULT_SAMPLES_PER_SEC);
diff --git a/gen_tone.c b/gen_tone.c
index 69d5b05..18afa4a 100644
--- a/gen_tone.c
+++ b/gen_tone.c
@@ -280,6 +280,8 @@ int gen_tone_init (struct audio_s *audio_config_p, int amp, int gen_packets)
* This avoids overshoot, ringing, and adding more jitter.
* Alternating bits come out has sine wave of baud/2 Hz.
*
+ * Version 1.6: MFJ-2400 compatibility for V.26.
+ *
*--------------------------------------------------------------------*/
static const int gray2phase_v26[4] = {0, 1, 3, 2};
@@ -304,6 +306,8 @@ void tone_gen_put_bit (int chan, int dat)
dat = 0;
}
+// TODO: change to switch instead of if if if
+
if (save_audio_config_p->achan[chan].modem_type == MODEM_QPSK) {
int dibit;
@@ -324,7 +328,9 @@ void tone_gen_put_bit (int chan, int dat)
symbol = gray2phase_v26[dibit];
tone_phase[chan] += symbol * PHASE_SHIFT_90;
-
+ if (save_audio_config_p->achan[chan].v26_alternative == V26_B) {
+ tone_phase[chan] += PHASE_SHIFT_45;
+ }
bit_count[chan]++;
}
diff --git a/man1/atest.1 b/man1/atest.1
index 9470496..a1b554c 100644
--- a/man1/atest.1
+++ b/man1/atest.1
@@ -21,17 +21,46 @@ atest \- Decode AX.25 frames from an audio file.
.SH OPTIONS
+
.TP
-.BI "-B " "n"
-Bits / second for data. Proper modem selected for 300, 1200, 9600.
-300 baud uses 1600/1800 Hz AFSK.
-1200 (default) baud uses 1200/2200 Hz AFSK.
-9600 baud uses K9NG/G2RUH standard.
+.BI "-B " "n"
+Data rate in bits/sec. Standard values are 300, 1200, 2400, 4800, 9600.
+.PD 0
+.RS
+.RS
+300 bps defaults to AFSK tones of 1600 & 1800.
+.P
+1200 bps uses AFSK tones of 1200 & 2200.
+.P
+2400 bps uses QPSK based on V.26 standard.
+.P
+4800 bps uses 8PSK based on V.27 standard.
+.P
+9600 bps and up uses K9NG/G3RUH standard.
+.RE
+.RE
+.PD
+
+.TP
+.BI "-g "
+Force G3RUH modem regardless of data rate.
+
+.TP
+.BI "-j "
+2400 bps QPSK compatible with Dire Wolf <= 1.5.
+
+.TP
+.BI "-J "
+2400 bps QPSK compatible with MFJ-2400.
.TP
.BI "-D " "n"
Divide audio sample rate by n.
+.TP
+.BI "-h "
+Print frame contents as hexadecimal bytes.
+
.TP
.BI "-F " "n"
Amount of effort to try fixing frames with an invalid CRC.
@@ -39,9 +68,17 @@ Amount of effort to try fixing frames with an invalid CRC.
1 = Try to fix only a single bit.
more = Try modifying more bits to get a good CRC.
+.TP
+.BI "-L "
+Error if Less than this number decoded.
+
+.TP
+.BI "-G "
+Error if Greater than this number decoded.
+
.TP
.BI "-P " "m"
-Select the demodulator type such as A, B, C, D (default for 300 baud), E (default for 1200 baud), F, A+, B+, C+, D+, E+, F+.
+Select the demodulator type such as D (default for 300 bps), E+ (default for 1200 bps), PQRS for 2400 bps, etc.
@@ -72,20 +109,20 @@ This generates and decodes 3 test files with 1200, 300, and 9600 bits per second
.PD 0
.B atest 02_Track_2.wav
.P
-.B atest -P C+ 02_Track_2.wav
+.B atest -P E- 02_Track_2.wav
.P
.B atest -F 1 02_Track_2.wav
.P
-.B atest -P C+ -F 1 02_Track_2.wav
+.B atest -P E- -F 1 02_Track_2.wav
.PD
.P
.RS
-Try different combinations of options to find the best decoding performance.
+Try different combinations of options to compare decoding performance.
.RE
.P
.SH SEE ALSO
More detailed information is in the pdf files in /usr/local/share/doc/direwolf, or possibly /usr/share/doc/direwolf, depending on installation location.
-Applications in this package: aclients, atest, decode_aprs, direwolf, gen_packets, kissutil, ll2utm, log2gpx, text2tt, tt2text, utm2ll
+Applications in this package: aclients, atest, cm108, decode_aprs, direwolf, gen_packets, kissutil, ll2utm, log2gpx, text2tt, tt2text, utm2ll
diff --git a/man1/direwolf.1 b/man1/direwolf.1
index 700790d..b9dfeff 100644
--- a/man1/direwolf.1
+++ b/man1/direwolf.1
@@ -48,19 +48,35 @@ Audio sample size for first channel. 8 or 16. Default 16.
.TP
.BI "-B " "n"
-Data rate in bits/sec for first channel. Standard values are 300, 1200, 9600.
+Data rate in bits/sec for first channel. Standard values are 300, 1200, 2400, 4800, 9600.
.PD 0
-.RS
.RS
-If < 600, tones are set to 1600 & 1800.
+.RS
+300 bps defaults to AFSK tones of 1600 & 1800.
.P
-If > 2400, K9NG/G3RUH scrambling is used.
+1200 bps uses AFSK tones of 1200 & 2200.
.P
-Otherwise, AFSK tones are set to 1200 & 2200.
+2400 bps uses QPSK based on V.26 standard.
+.P
+4800 bps uses 8PSK based on V.27 standard.
+.P
+9600 bps and up uses K9NG/G3RUH standard.
.RE
.RE
.PD
+.TP
+.BI "-g "
+Force G3RUH modem regardless of data rate.
+
+.TP
+.BI "-j "
+2400 bps QPSK compatible with Dire Wolf <= 1.5.
+
+.TP
+.BI "-J "
+2400 bps QPSK compatible with MFJ-2400.
+
.TP
.BI "-D " "n"
Divide audio sample by n for first channel.
@@ -92,6 +108,10 @@ o = Output controls such as PTT and DCD.
i = IGate
.P
h = Hamlib verbose level. Repeat for more.
+.P
+m = Monitor heard station list.
+.P
+f = Packet filtering.
.RE
.RE
.PD
@@ -152,5 +172,5 @@ rtl_fm \-f 144.39M \-o 4 \- | direwolf \-n 1 \-r 24000 \-b 16 \-
.SH SEE ALSO
More detailed information is in the pdf files in /usr/local/share/doc/direwolf, or possibly /usr/share/doc/direwolf, depending on installation location.
-Applications in this package: aclients, atest, decode_aprs, direwolf, gen_packets, kissutil, ll2utm, log2gpx, text2tt, tt2text, utm2ll
+Applications in this package: aclients, atest, cm108, decode_aprs, direwolf, gen_packets, kissutil, ll2utm, log2gpx, text2tt, tt2text, utm2ll
diff --git a/man1/gen_packets.1 b/man1/gen_packets.1
index 39f8925..773a88e 100644
--- a/man1/gen_packets.1
+++ b/man1/gen_packets.1
@@ -32,12 +32,36 @@ Signal amplitude in range of 0-200%. Default 50. Note that 100% is corresponds
Bits / second for data. Default is 1200.
.TP
-.BI "-B " "n"
-Bits / second for data. Proper modem selected for 300, 1200, 9600.
+.BI "-B " "n"
+Data rate in bits/sec for first channel. Standard values are 300, 1200, 2400, 4800, 9600.
+.PD 0
+.RS
+.RS
+300 bps defaults to AFSK tones of 1600 & 1800.
+.P
+1200 bps uses AFSK tones of 1200 & 2200.
+.P
+2400 bps uses QPSK based on V.26 standard.
+.P
+4800 bps uses 8PSK based on V.27 standard.
+.P
+9600 bps and up uses K9NG/G3RUH standard.
+.RE
+.RE
+.PD
.TP
-.BI "-g"
-Scrambled baseband rather than AFSK.
+.BI "-g "
+Force G3RUH modem regardless of data rate.
+
+.TP
+.BI "-j "
+2400 bps QPSK compatible with Dire Wolf <= 1.5.
+
+.TP
+.BI "-J "
+2400 bps QPSK compatible with MFJ-2400.
+
.TP
.BI "-m " "n"
@@ -112,5 +136,5 @@ Read message from stdin and put quarter volume sound into the file x.wav. Decod
.SH SEE ALSO
More detailed information is in the pdf files in /usr/local/share/doc/direwolf, or possibly /usr/share/doc/direwolf, depending on installation location.
-Applications in this package: aclients, atest, decode_aprs, direwolf, gen_packets, ll2utm, log2gpx, text2tt, tt2text, utm2ll
+Applications in this package: aclients, atest, cm108, decode_aprs, direwolf, gen_packets, kissutil, ll2utm, log2gpx, text2tt, tt2text, utm2ll