[digitalradio] MT63 specifications
An excerpt from Pawel Jalocha's source code distribution: The MT63 modem is intended for amateur radio as a conversation (RTTY like) mode where one station transmits and one or more other stations can listen. In short, the modem transmits 64 tones in its 1 kHz bandwidth: the audio range for the tones is 500-1500 Hz. The differential bipolar phase modulation is used to encode 10 bits of information per second on each tone. The user data in the form of 7-bit ASCII characters is encoded as a set of 64-point Walsh functions. The bits are interleaved over 32 symbols (3.2 seconds) to provide resistance against both pulse and frequency selective noise or fading. The character rate equals to the symbols rate thus the modem can transmit 10 7-bit characters per second. This modem can as well run in two other modes obtained by simple time scaling, the possible modes are summarized here: BandwidthAudio RangeSymbol Rate Character Rate Interleave / Char. 500 Hz 500 - 1000 Hz 5 baud 5 char / sec 6.4 or 12.8 sec 1000 Hz 500 - 1500 Hz 10 baud 10 char / sec 3.2 or 6.4 sec 2000 Hz 500 - 2500 Hz 20 baud 20 char / sec 1.6 or 3.2 sec For each mode the interleave factor can be doubled thus each character becomes spread over twice as long period of time. The MT63 modem is made for single side band operation. The audio generated by the modem (sound card output) is applied to the SSB modulator. On the receiver side, the output of the SSB demodulator is put into the sound card input. The envelope of the MT63 signal is not constant as in other multi-tone systems - it is rather noise-like. One must be carefull not to overdrive the transmitter. The receiver of the MT63 is self-tuning and self-synchronizing thus the radio operator is only required to tune into the signal with +/- 100 Hz accuracy for the basic 1000 Hz mode. The modem will tell the actuall frequency offset after it is synchronized. The operator should not try to correct this offset unless he is able to tune very slowly his radio receiver, because the MT63 as a low rate phase modulated system does not like sudden frequency changes. The MT63 is a synchronous system and it relies on the sampling rate to be the same at the receiver and the transmitter. At least the sampling rates should not be different by more that 10^-4. MT63 samples at 8000 Hz thus if your card runs at 8000.5 it's probably OK but if it runs at 8005 Hz it's not good ! An extreme example can be my Soundman-16 (PAS-16 clone) which when asked to run 8000 Hz tell me, that it can only do 8008 Hz and it reality it runs at 7910.3 Hz which makes an error of more than 1% - far too much for the MT63 even at infinitely good S/N. My other two cards (DSP-16 and Ensoniq 1371) are more reasonable: they show an error of 0.3 to 0.5 Hz at 8000 Hz sampling.
[digitalradio] More on RS ID ... the pleasure of
I know several have written about RS ID now that it is fully implemented in Multipsk, DM780, Pocketdigi, and Fldigi. I have been off the air for a few weeks , today I installed software on my new PC (DX Lab Suite, Multipsk, HRD/DM780 and FLdigi always go on a new PC first! ) I booted up DM780 to take a look since I am a little behind in the latest developments for DM780, I heard NO signals on the band but within the first minute I saw RSID:THOR 16 f=2Ø4ØHz I clicked to allow the RS ID and saw CQ CQ de VE9NC VE9NC CQ CQ de VE9NC VE9NC I am going to work now, but have decided to leave DM780 active and my rig on 20M just to see what modes DM780 detects while I am out. The 3 Khz spread my rig limits me to gets to be a little sad when compared to a SDR bandwidth, maybe I'll play around with Commander and see if I can scan different 3 kHz sections a few minutes at a time. -- Andy
[digitalradio] Re: More on RS ID ... the pleasure of
- I am going to work now, but have decided to leave DM780 active and my rig on 20M just to see what modes DM780 detects while I am out. The 3 Khz spread my rig limits me to gets to be a little sad when compared to a SDR bandwidth, maybe I'll play around with Commander and see if I can scan different 3 kHz sections a few minutes at a time. -- Andy Yes, using Commander, I set the dwell time for scanning to just 3 seconds. I am scanning four 3Khz segments over 12 seconds. I may miss a few RS IDs but it should be interesting.
Re: [digitalradio] Re: More on RS ID ... the pleasure of
Yes, using Commander, I set the dwell time for scanning to just 3 seconds. I am scanning four 3Khz segments over 12 seconds. I may miss a few RS IDs but it should be interesting. Does a log file get created with the time's and freqs of RS-ID's heard?
Re: [digitalradio] Re: More on RS ID ... the pleasure of
Not with DM780 - now I could do this, sooner or later DM780 fldigi will support the CALL-ID feature, when we do this a log could make sense. Simon Brown, HB9DRV www.ham-radio-deluxe.com - Original Message - From: Bill V WA7NWP wa7...@gmail.com Does a log file get created with the time's and freqs of RS-ID's heard?
[digitalradio] flarq compatible modes
I have received several reports that users have not been able to get flarq-fldigi=fldigi-flarq to establish an flarq connection. I think that the problem might have been a failure on my part to delineate which modes are compatible with flarg. I have updated the on-line documentation for flarq thusly: Flarq can be used with the following digital modem as the transport layer: BPSK all baud rates QPSK all baud rates MFSK all baud rates DOMINOEX 11 or faster (do not use FEC) THOR all baud rates, 11 or faster recommended MT63 - all baud rates, flarq timing should be increased to accommodate mt63 latency for example: MT63-500 requires flarq be set up with: Wait time 30 seconds Timeout 300 seconds Tx delay 500 msec Beacon interval 30 seconds on both ends. Watch the flowers grow :-) Probably the most important thing for persons trying the flarq / fldigi suite to know is that they should not use DominoEX-FEC or Olivia as the transport layer. These modes suppress the transmission of the required control codes for the flarq data stream. 73, Dave, W1HKJ
[digitalradio] NZ4O Daily LF/MF/HF/6M Frequency Radiowave Propagation Forecast #2009-28
The NZ4O Daily LF/MF/HF/6M Frequency Radiowave Propagation Forecast #2009-28 has been published on Thursday 08/13/2009 at 1700 UTC, valid UTC Saturday 08/15/2009 through 2359 UTC Friday 08/21/2009 at http://www.wcflunatall.com/kn4lf6.htm . 73 GUD DX, Thomas F. Giella, NZ4O Lakeland, FL, USA n...@arrl.net NZ4O Daily Solar Space Weather Geomagnetic Data Archive: http://www.wcflunatall.com/kn4lf5.htm NZ4O Daily LF/MF/HF/6M Frequency Radiowave Propagation Forecast Archive: http://www.wcflunatall.com/kn4lf6.htm NZ4O 160 Meter Radio Propagation Theory Notes: http://www.wcflunatall.com/kn4lf8.htm NZ4O Solar Space Weather Geomagnetic Data In Graphic Image Format: http://www.wcflunatall.com/kn4lf59.htm NZ4O Solar Cycle 24 Forecast Discussion Archive: http://www.wcflunatall.com/kn4lf72.htm NZ4O LF/MF/HF/VHF Frequency Radiowave Propagation Email Reflector: http://lists.contesting.com/mailman/listinfo/spaceweather NZ4O Harmful Man Induced Climate Change (Global Warming) Refuted: http://www.wcflunatall.com/globalwarminglie.htm No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.53/2299 - Release Date: 08/12/09 18:12:00
[digitalradio] Updated list of RS ID
Hello to all,
Just for information, here is the updated list of RS ID (addition of
MIL-STD-188-110A RS ID).
73
Patrick
IF NUMBER=1 THEN MODE:='BPSK31' ELSE
IF NUMBER=2 THEN MODE:='BPSK63' ELSE
IF NUMBER=3 THEN MODE:='QPSK63' ELSE
IF NUMBER=4 THEN MODE:='BPSK125' ELSE
IF NUMBER=5 THEN MODE:='QPSK125' ELSE
IF NUMBER=7 THEN MODE:='PSKFEC31' ELSE
IF NUMBER=8 THEN MODE:='PSK10' ELSE
{MT63 parameter 1 parameter 2 (parameter 1: 500, 1000 (1000 Hz) or
2000 (2000 Hz),
parameter 2: LG (Long), ST (Short) or VST (Very short)
Example: MT63-1000-LG}
IF NUMBER=9 THEN MODE:='MT63-500-LG' ELSE
IF NUMBER=10 THEN MODE:='MT63-500-ST' ELSE
IF NUMBER=11 THEN MODE:='MT63-500-VST' ELSE
IF NUMBER=12 THEN MODE:='MT63-1000-LG' ELSE
IF NUMBER=13 THEN MODE:='MT63-1000-ST' ELSE
IF NUMBER=14 THEN MODE:='MT63-1000-VST' ELSE
IF NUMBER=15 THEN MODE:='MT63-2000-LG' ELSE
IF NUMBER=17 THEN MODE:='MT63-2000-ST' ELSE
IF NUMBER=18 THEN MODE:='MT63-2000-VST' ELSE
IF NUMBER=19 THEN MODE:='PSKAM10' ELSE
IF NUMBER=20 THEN MODE:='PSKAM31' ELSE
IF NUMBER=21 THEN MODE:='PSKAM50' ELSE
IF NUMBER=22 THEN MODE:='PSK63F' ELSE
IF NUMBER=23 THEN MODE:='PSK220F' ELSE
{CHIP 64 parameter 1 (parameter 1: 64 or 128), Example: CHIP-64}
IF NUMBER=24 THEN MODE:='CHIP-64' ELSE
IF NUMBER=25 THEN MODE:='CHIP-128' ELSE
IF NUMBER=26 THEN MODE:='CW' ELSE
{CCW parameter 1 parameter 2 (parameter 1: OOK or FSK,
parameter 2: 12 (12 wpm), 24 (24 wpm) or 48 (48 wpm)
Examples: CCW-OOK-12 or CCW-FSK-24}
IF NUMBER=27 THEN MODE:='CCW-OOK-12' ELSE
IF NUMBER=28 THEN MODE:='CCW-OOK-24' ELSE
IF NUMBER=29 THEN MODE:='CCW-OOK-48' ELSE
IF NUMBER=30 THEN MODE:='CCW-FSK-12' ELSE
IF NUMBER=31 THEN MODE:='CCW-FSK-24' ELSE
IF NUMBER=33 THEN MODE:='CCW-FSK-48' ELSE
{Pactor1 ARQ not RX/TX in Multipsk 4.1.1}
IF NUMBER=34 THEN MODE:='PACTOR1-FEC' ELSE
{PACKET parameter 1 (parameter 1: 300 (bauds) or 1200
(bauds)),Example: PACKET-300}
IF NUMBER=35 THEN MODE:='PACKET-300' ELSE
IF NUMBER=36 THEN MODE:='PACKET-1200' ELSE
{ASCII parameter 1 (parameter 1: 7 (7 bits) or 8 (8 bits)), Example:
ASCII-7}
IF NUMBER=37 THEN MODE:='ASCII-7' ELSE
IF NUMBER=38 THEN MODE:='ASCII-8' ELSE
{RTTY parameter 1 (parameter 1: 45 (45 bauds), 50 (50 bauds), 75
(75 bauds)), Example: RTTY-45}
IF NUMBER=39 THEN MODE:='RTTY-45' ELSE
IF NUMBER=40 THEN MODE:='RTTY-50' ELSE
IF NUMBER=41 THEN MODE:='RTTY-75' ELSE
IF NUMBER=42 THEN MODE:='AMTOR FEC' ELSE
{THROB parameter 1 (parameter 1: 1 (1 baud), 2 (2 bauds) or 4 (4
bauds)), Example: THROB-2}
IF NUMBER=43 THEN MODE:='THROB-1' ELSE
IF NUMBER=44 THEN MODE:='THROB-2' ELSE
IF NUMBER=45 THEN MODE:='THROB-4' ELSE
{THROBX parameter 1 (parameter 1: 1 (1 baud) or 2 (2 bauds)),
Example: THROBX-2}
IF NUMBER=46 THEN MODE:='THROBX-1' ELSE
IF NUMBER=47 THEN MODE:='THROBX-2' ELSE
{CONTESTIA parameter 1 parameter 2 (parameter 1: 4 (4 tones), 8 (8
tones), 16 (16 tones), 32 (32 tones), parameter 2: 250 (B=250 Hz),
500 (B=500 Hz) or 1000 (B=1000 Hz))...same parameters as OLIVIA
Examples: CONTESTIA-32-1000 or CONTESTIA-8-500
Note: the following are the main Contestia modes:
CONTESTIA-4-250, CONTESTIA-4-500, CONTESTIA-8-250, CONTESTIA-8-500,
CONTESTIA-16-500, CONTESTIA-16-1000, CONTESTIA-32-1000}
IF NUMBER=49 THEN MODE:='CONTESTIA-8-250' ELSE
IF NUMBER=50 THEN MODE:='CONTESTIA-16-500' ELSE
IF NUMBER=51 THEN MODE:='CONTESTIA-32-1000' ELSE
IF NUMBER=52 THEN MODE:='CONTESTIA-8-500' ELSE
IF NUMBER=53 THEN MODE:='CONTESTIA-16-1000' ELSE
IF NUMBER=54 THEN MODE:='CONTESTIA-4-500' ELSE
IF NUMBER=55 THEN MODE:='CONTESTIA-4-250' ELSE
IF NUMBER=56 THEN MODE:='VOICE' ELSE
IF NUMBER=57 THEN MODE:='MFSK16' ELSE
IF NUMBER=60 THEN MODE:='MFSK8' ELSE
{RTTYM parameter 1 parameter 2 (parameter 1: 4 (4 tones), 8 (8
tones), 16 (16 tones), 32 (32 tones), parameter 2: 250 (B=250 Hz),
500 (B=500 Hz) or 1000 (B=1000 Hz))...same parameters as OLIVIA
Examples: RTTYM-32-1000 or RTTYM-8-500
Note: the following are the main RTTYM modes: RTTYM-4-250, RTTYM-4-500,
RTTYM-8-250, RTTYM-8-500, RTTYM-16-500, RTTYM-16-1000, RTTYM-32-1000}
IF NUMBER=61 THEN MODE:='RTTYM-8-250' ELSE
IF NUMBER=62 THEN MODE:='RTTYM-16-500' ELSE
IF NUMBER=63 THEN MODE:='RTTYM-32-1000' ELSE
IF NUMBER=65 THEN MODE:='RTTYM-8-500' ELSE
IF NUMBER=66 THEN MODE:='RTTYM-16-1000' ELSE
IF NUMBER=67 THEN MODE:='RTTYM-4-500' ELSE
IF NUMBER=68 THEN MODE:='RTTYM-4-250' ELSE
{OLIVIA parameter 1 parameter 2 (parameter 1: 4 (4 tones), 8 (8
tones), 16 (16 tones), 32 (32 tones), parameter 2: 250 (B=250 Hz),
500 (B=500 Hz) or 1000 (B=1000 Hz))
Examples: OLIVIA-32-1000 or OLIVIA-8-500
Note: the following are the main Olivia modes: OLIVIA-4-250, OLIVIA-4-500,
OLIVIA-8-250, OLIVIA-8-500, OLIVIA-16-500, OLIVIA-16-1000, OLIVIA-32-1000}
IF NUMBER=69 THEN MODE:='OLIVIA-8-250' ELSE
IF NUMBER=70 THEN MODE:='OLIVIA-16-500' ELSE
IF NUMBER=71 THEN MODE:='OLIVIA-32-1000' ELSE
IF NUMBER=72 THEN MODE:='OLIVIA-8-500' ELSE
IF NUMBER=73 THEN MODE:='OLIVIA-16-1000'
Re: [digitalradio] flarq compatible modes
Dave, Is the beacon interval OK? Wouldn't it better be 30 MINUTES? I wonder, because I used to run beacons every 10 minutes on packet. Less than that could be considered antisocial by some people... :-( 73, Jose, CO2JA --- David Freese escribió: for example: MT63-500 requires flarq be set up with: Wait time 30 seconds Timeout 300 seconds Tx delay 500 msec Beacon interval 30 seconds on both ends. Watch the flowers grow :-) Probably the most important thing for persons trying the flarq / fldigi suite to know is that they should not use DominoEX-FEC or Olivia as the transport layer. These modes suppress the transmission of the required control codes for the flarq data stream. 73, Dave, W1HKJ __ Información de ESET NOD32 Antivirus, versión de la base de firmas de virus 3832 (20090206) __ ESET NOD32 Antivirus ha comprobado este mensaje. http://www.eset.com Participe en Universidad 2010, del 8 al 12 de febrero de 2010 La Habana, Cuba http://www.universidad2010.cu - SEGUNDO SEMINARIO INTERNACIONAL LEGADO Y DIVERSIDAD. ARQUITECTURA Y URBANISMO. El rescate de los valores urbanos y arquitectónicos en tiempos de globalización Colegio de San Gerónimo, La Habana Vieja, noviembre 24-27, 2009 -
