Egypt maintains an extensive HF diplomatic network. It utilizes two main digital modes, both broadcast in USB:

  • SITOR-A, centered at +1700 Hz (the startup mode)
  • A commercial off-the-shelf Codan modem (9001 or 3012), using its proprietary ALE (Chirp) and data systems

When a SITOR-A link cannot be established, SITOR-B (also centered at +1700Hz) may be used to broadcast a frequency change request.

Broadcast structure

Ideally, the broadcasts consist of:

  1. Calling the embassy in SITOR-A, with initial chatter
  2. Calling the embassy using the proprietary Codan Chirp calling mode
  3. Transferring messages using the proprietary Codan 16-tone QPSK waveform
  4. End of transmission chatter in SITOR-A

However, quite often, SITOR-A is also used to transfer messages, typically in poor conditions. The operator chatter is in Arabic, and encoded using the ATU80 alphabet.

Initial chatter is usually traditional Arabic greetings. When a message is about to be sent, it is often indicated by the phrase "ﺍﺱﺕﻉﺩ" (get ready).

Message structure

Regardless of the mode used to transfer the messages, they follow the same format. There are two different kinds of messages:

  • Offline encrypted 5-digit hex group traffic; uppercase A..F, 1 space between groups, 10 groups per line, trailing space in each line
  • Arabic or English cleartext

Messages are preceded by clear headers of the following format, either in English or Arabic, one item per line:

  1. "From : " or "ﻡﻥ: " followed by the location the source station, or a numeric ID in case of Cairo
  2. "To : " or "ﺍﻝﻱ: " followed by the location the destination station, or a numeric ID in case of Cairo
  3. "Time & Date : " followed by the timestamp of the message, in the following format: 11:57, Saturday, November 25, 2017
  4. In case of encrypted traffic, "Number Of Groups: " followed by the group count
  5. Message priority, practically always "URGENT"
  6. A separator in form of "===================="

End of message is signified by a variable amount of N's.


Contacts always take place with Cairo directly. The stations use different ID's for the SITOR-A and Codan Chirp calling modes, both of which are structured to reflect the part of the world the embassy is in.

Additionally, MFA Cairo has multiple pairs of ID's on the network, presumably one per department. While the Chirp ID's are seen every time a Codan link is being established, the SITOR-A ID's are used only in exceptional circumstances.

SITOR-A Chirp Location
MFA Cairo
SSBB 99911 Cairo
SSBE 99913 Cairo
SSBT 99910 Cairo
SSBU 99912 Cairo
SSOU 99942 Cairo
SSTA 99909 Cairo
SSTD 99908 Cairo
SSTE 99903 Cairo
SSTI 99905 Cairo
SSTO 99904 Cairo
SSTR 99906 Cairo
SSTU 99902 Cairo
SSTZ 99907 Cairo
SSUO 99924 Cairo
? 00071 Military Intelligence, Cairo
Arab States
TVQS 00029 ?
TVQV 00020 Riyadh
TVVC 00006 Baghdad
TVQX 00021 Tehran
TVVF 00008 Beirut
TVVK 00003 Rabat
TVVM 00004 Kuwait City
TVVP 00005 Abu Dhabi
TVVQ 00002 Khartoum
TVVS 00009 Kuwait City
TVVX 00001 Algiers
TVXC 00016 Abidjan
TVXP 00015 Mogadishu
TVXQ 00012 ?
TVXS 00019 Manama
TVXV 00010 Doha
TVXX 00011 Sana'a
TVXY 00017 Muscat
XBKX 11131 Bern
XBPV 11150 ?
XBVA 81109 London
XBVC 11106 Vienna
XBVF 11108 Madrid
XBVK 11103 Bern
XBVM 11104 Berlin
XBVP 11105 Rome
XBVQ 11102 Paris
XBVS 11109 Nicosia
XBVX 11101 Bucharest
XBVY 11107 London
XBXF 11118 ?
Eastern Europe
QQTC 22206 ?
QQTP 22205 Moscow
QQTQ 22202 Belgrade
QQTX 22261 Prague
KKVA 33309 Lagos
KKVB 33301 Addis Ababa
KKVD 33308 Conakry
KKVE 33303 Bamako
KKVI 33305 Dar es Salaam
KKVK ? Accra
KKVO 33304 N'djamena
KKVR 33306 Dakar
KKVU 33302 Accra
KKVZ 33307 Kampala
KKXB 33311 Kinshasa
KKXD 33318 Djibouti
KKXE 33313 Luanda
KKXI 33315 Asmara
KKXO 33314 Abidjan
KKXR 33316 Tunis
KKXT 33310 Nairobi
KKXU 33312 Harare/Accra
OOUS ? ?
OOVC 44406 New Delhi
OOVF 44408 Pyongyang
OOVK 44403 Jakarta
OOVP 44405 Islamabad
OOVQ 44402 Beijing
OOVS 44409 Kuala Lumpur
OOVX 44401 Ankara
OOVY 44407 ?
Latin America
IPTX 55501 Havana
North America
RCVB 66601 Washington, D.C.

Source: UDXF

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