ARQ6-90

ARQ6-90 - ARQ6-98 

ARQ6-90

Frequencies	10 MHz,23 MHz
Frequency Range	10 MHz - 23 MHz
Mode	USB
Modulation	FSK
ACF	—
Emission Designator	—
Bandwidth	700 Hz
Location	Worldwide
Short Description	ARQ6-90, also known as ARQ-6-90 and ARQ-6/90, is a 6-character block simplex ARQ system formerly used by French and Italian diplomatic services exchange of teletype-data. It is no longer used or seen today.
I/Q Raw Recording	—
Audio Sample

ARQ6-90 is a 6-character block simplex ARQAutomatic Repeat reQuestAutomatic Repeat Query system formerly used by French and Italian diplomatic services. It is no longer used or seen today. This mode is very similar to SITOR, and uses the CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R)-476 charset.

ARQ6-90 and ARQ6-98 differ in both bandwidth and their inter datablock timing. A complete cycle for ARQ6-90 has duration of 450 msmilliseconds (.001 of a second) of which the data block is 210 msmilliseconds (.001 of a second) an interval is 230 msmilliseconds (.001 of a second).

Frequencies

A log from 1994:

FREQUENCY   MODE    BAUD/SHIFT   CALL/ID         COMMENTS 
---------  -------  ----------  ---------  -------------------- 
 10180.43  ARQ6/90  200/300                5 LG'S, NO ID 
 14531.36  ARQ6/90  200/258                5 LG'S, FF 
                                           DIPLOMATIC MSGS. 
 15801.44  ARQ6/90  200/230     "FDFE"???  MSG. FROM 
                                           "MINDEFENSE PARIS" , 
                                           DIPLOMATIC MSG TO 
                                           COLUMBIA 
 17454.50  ARQ6/90  200/200     "FDEFE"    5LG'S, FF. 
                                           MSG.,DIPLOMATIC MSG. 
                                           "RIO DE JANEIRO" 
                                           RESULTS OF ELECTIONS 
                                           IN BRAZIL. 
 18033.50  ARQ6/90  200/450     "RFGW"     FF MSG. AND 5LG'S . 
                                           FF EMB IN COLUMBIA 
                                           TO PARIS 
 18450.36  ARQ6/90  200/170                5 LG'S AND FF MSG. 
                                           TO LIMA 
 18487.75  ARQ6/90  200/300 
 19763.82  ARQ6/90  200/170                FF MSG ABOUT 
                                           PASSPORTS, 
                                           AMBASSADORS, ETC. 
                                           "RETAIRE DE 
                                           L'AMBASSADE DE 
                                           CHINE". 
 19931.83  ARQ6/90  200/170     "RFGW"     5LG'S 
 20838.00  ARQ6/90  200/350                RXReceive. IDLE ONLY 
 21854.81  ARQ6/90  200/237                FF MSG., PARIS 
                                           HEADINGS, "AGER DERA 
                                           785", 5LG'S 
 21867.82  ARQ6/90  200/300 
 21927.00  ARQ6/90  200/200     ?          all encrypted except 
                                           for "QRU" at end 
 22853.80  ARQ6/90  200/396     "RFGW"     MFA PARIS. FF MSG. 
                                           ABOUT MINISTER OF 
                                           INTERIOR 
 22879.80  ARQ6/90  200/193                5LG'S AND FF. MSG. 
 22959.77  ARQ6/90  200/300     "BRSL"     FF MSG. AND 5LG'S . 
                                           MOST PROBABLY "RFGW" 
 22979.88  ARQ6/90  200/170                FF MSG., 
                                           "DIPLOMATIQUE", 
                                           5LG'S

Decoding Software

Professional Equipment/Software

• go2DECODE
• go2MONITOR
• Hoka Code 300-32
• Wavecom W-Code
• Wavecom W-Spectra
• Rohde&Schwarz CA100

Video Examples

Analysis and decoding of an ARQ 6/90 signal (old mode used by the French armed forces).

Additional Links

• RadioRaft ARQ6-90/98
• numbersoddities Info
• Utility World Info
• shoc Database: ARQ-6-90
• WAVECOM Database: ARQ6-90 and ARQ6-98