Sandbox:IRA-ARQ

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Vorlage:Signal IRA-ARQ, also known as BULG-ASCII and ASCII-ARQ, is a high data rate ARQ FSK system used by Bulgarian, Slovakian, and Czech diplomatic stations. The maximum speed of this mode has been seen to reach 1200 bd. IRA-ARQ uses the ASCII (ITA-5 or IRA) alphabet charset. Some transmissions of IRA-ARQ can be decoded using an ASCII decoder.

This mode is typically found with baud rates of 75, 100, 110, 150, 180, 200, 240, 300 or 600 bd. Faster baud rates have also been seen.

Samples


300Bd 500Hz Shift	600Bd 600Hz Shift
<html5media>File:bulgascii 300bd 500 shift.mp3</html5media>	<html5media>File:BUL-IRA-ARQ600Bd.mp3</html5media>


800Bd 800Hz Shift	1000Bd 1000Hz Shift
<html5media>File:BUL-IRA-ARQ800Bd.mp3</html5media>	<html5media>File:BUL-IRA-ARQ1000Bd.mp3</html5media>

Log

DX log from 1990's

Y/M/D
960205 0734 0734  8008.00 ???                 Czech MFA, Prague           300.4bd/400 ASCII-ARQ, crypto fm "Praha" to "PARIZ,LISABON,STRASB"    
961017 2121 2121  8065.30 DOR***              Bulgarian MFA, Sofia        300bd/500 ASCII-ARQ, tfc                                              
971218 1848 1848  8068.20 DOR***              Bulgarian MFA, Sofia        300.2bd/500 ASCII-ARQ, tfc                                            
970211 1843 1843  9068.30 ???                 Bulgarian Diplo, ???        300bd/500 ASCII-ARQ, tfc                                              
951227 1359 1359  9276.00 DOR***              Bulgarian MFA, Sofia        300bd/500 ASCII ARQ System                                            
960215 0759 0759  9288.00 ???                 Czech/Slovak/Bulgarian E    300bd/400 ASCII-ARQ, crypto tfc                                       
960229 0729 0729  9942.14 ???                 Czech/Slovak MFA, ???       300.5bd/200 ASCII-ARQ, crypto                                         
960401 0649 0649 10154.30 DOR***              Bulgarian MFA, Sofia        75bd/500 Baudot, Call-up "olg olg olg qap"  then into ASCII-ARQ       
951229 1242 1242 10705.00 ???                 ???, ???                    300bd/425 ASCII-ARQ System, crypto                                    
991214 0332 0332 10875.80 AG7L                US Mil, ???                 75bd/165 ASCII, 5LGs and 5FGs tfc                                     
961227 0846 0846 11146.77 DOR***              Bulgarian MFA, Sofia        300bd/500 ASCII-ARQ, sync, burst, ACF=11                              
981015 2113 2113 11153.20 DOR***              Bulgarian MFA, Sofia        300.3bd/500 ASCII-ARQ, tfc                                            
960618 2059 2059 11164.30 DOR***              Bulgarian MFA, Sofia        300bd/500 ASCII-ARQ, Call-up in 75bd/500 Baudot to "PMO" Washington   
981015 2236 2236 11664.00 ???                 ???, ???                    300.3bd/700 ASCII-ARQ, tfc                                            
960826 0827 0827 12204.75 DOR***              Bulgarian MFA, Sofia        362.4bd/500 ASCII-ARQ, ACF=10                                         
970402 1352 1352 12207.95 ???                 ???, ???                    212.8bd/400 ASCII-ARQ, opchat "je tu obcas"                           
951128 1433 1433 12219.04 OMZ?                Slovak MFA?, Bratislava?    300bd/400/E ASCII-ARQ, MSG to Athens, ends "cau++"                    
970509 0747 0747 12221.00 ???                 Czech/Slovak Diplo, ???     300.5bd/400 ASCII-ARQ, Crypto                                         
961228 1318 1318 13426.30 DOR***              Bulgarian MFA, Sofia        272.74bd/500 ASCII-ARQ, tfc                                           
970123 0821 0821 13456.00 DOR***              Bulgarian MFA, Sofia        300bd/500 ASCII-ARQ, tfc with filename RA_001.AIN                     
970222 1347 1347 13838.00 COY851***           Russian Intel, Havana       300.5bd/500 ASCII, 5LGs to YFC QSX 14417kHz                           
981015 2035 2035 13932.00 DOR***              Bulgarian MFA, Sofia        300.1bd/500 ASCII-ARQ, tfc                                            
961227 0903 0903 13933.30 DOR***              Bulgarian MFA, Sofia        362.3bd/500 ASCII-ARQ, ACF=11                                         
960826 1124 1124 14479.00 ???                 ???, ???                    300.6bd/420 ASCII ARQ, ACF=11 on tfc, opchat in 300bd ASCII           
970402 1408 1408 14760.24 ???                 Bulgarian Diplo, ???        300bd/500 ASCII-ARQ, Call-up in 75bd/500 Baudot                       
961229 1444 1444 14830.27 DOR***              Bulgarian MFA, Sofia        300bd/500 ASCII-ARQ, tfc after "zar 300" in 75bd RTTY                 
970402 1251 1251 14871.30 DOR***              Bulgarian MFA, Sofia        600bd/600 ASCII-ARQ, Uuencode-like tfc                                
991105 1223 1223 15937.90 ???                 Czech/Slovak Diplo, ???     212.5bd/500 ASCII-ARQ, crypto                                         
990514 2025 2025 16015.25 DOR***              Bulgarian MFA, Sofia        210.3bd/500 ASCII-ARQ, MSG ends "73 88 sk"                            
980825 2140 2140 16303.60 Y7YOD***            US SIGINT Training, ???     75bd/170 ASCII, "ryryryry 4FGs elbf de y7yod pse kkk"                 
970406 1446 1446 16312.30 DOR***              Bulgarian MFA, Sofia        150bd/500 ASCII-ARQ, tfc                                              
980907 2030 2030 16320.20 ???                 Czech/Bulgarian Diplo, ???  210.3bd/500 ASCII-ARQ, tfc                                            
981216 1329 1329 16353.00 OMZ66               Slovakian MFA, Bratislava   212.8bd/550 ASCII-ARQ, tfc                                            
991207 1415 1415 18318.00 OMZ66               Slovak MFA, Bratislava      212.5bd/500 ASCII-ARQ, tfc                                            
961231 0949 0949 19060.27 LZV2                Bulgarian Embassy, ???      300bd/500 ASCII-ARQ, crypto to DOR on QSX 20362.3kHz                  
981127 1425 1425 23108.30 ???                 Czech/Bulgarian Diplo, ???  362.3bd/500 ASCII-ARQ, tfc

Video Examples

IRA-ARQ Analysis and decoding signals

Decoding Software

Hobby Level Software

Sorcerer

Professional Equipment/Software

Hoka Code 300-32
Shoc go2decode
Shoc go2monitor
Wavecom W-Code
Wavecom W-Spectra

Additional Links

Additional Images