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

  • SITOR-A, centered at +1700 Hz (the primary mode)
  • A commercial off-the-shelf Codan 9001/3012 modem (the secondary mode, used often)

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 using the SITOR-A selcall mode, followed by initial chatter
  2. Calling the embassy using the proprietary Codan Chirp calling mode
  3. Transferring messages using the proprietary Codan 9001/3012 waveform
  4. Calling the embassy using the SITOR-A selcall mode, followed by end of transmission chatter (optional)

However, it is not uncommon for SITOR-A to be also used to transfer messages, typically in poor conditions. The operator chatter is in Arabic, and is encoded using the ATU80 alphabet.

The 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 after each line
  • Arabic cleartext

5-digit group messages originating from or addressed to the military intelligence in Cairo use English headers of the following format, line by line:

  1. "From : " followed by a capital city name, or "71" in case of Cairo
  2. "To : " followed by a capital city name, or "71" in case of Cairo
  3. "Time & Date : " followed by the date/time of the message, using the following format: "11:57, Saturday, November 25, 2017"
  4. "Urgent" (no other values have been observed in this line)
  5. A separator in form of a variable number of equal signs

The occasional Arabic messages use simpler Arabic headers:

  1. Three equal signs
  2. "ﻡﻥ : " followed by a capital city name, or a department name in case of Cairo
  3. "ﺍﻝﻱ : " followed by a capital city name, or a department name in case of Cairo
  4. Three equal signs

End of message is marked by a variable number of N's.


Contacts always take place with Cairo directly. Each embassy has a numeric ID assigned to it. The numeric IDs are used directly in the Codan Chirp calling mode, while the SITOR-A IDs are constructed using letter substitutions.

Additionally, MFA Cairo has many IDs on the network. While their Chirp IDs are seen every time a Codan link is being established, their SITOR-A IDs are used only in exceptional circumstances.

SITOR-A Chirp Location
MFA Cairo
? 00071 Military intelligence
SSTU 99902 MFA Cairo
SSTE 99903 MFA Cairo
SSTO 99904 MFA Cairo
SSTI 99905 MFA Cairo
SSTR 99906 MFA Cairo
SSTZ 99907 MFA Cairo
SSTD 99908 MFA Cairo
SSTA 99909 MFA Cairo
SSBT 99910 MFA Cairo
SSBB 99911 MFA Cairo
SSBU 99912 MFA Cairo
SSBE 99913 MFA Cairo
SSUO 99924 MFA Cairo
SSOU 99942 MFA Cairo
Muslim States
TVVX 00001 Algiers
TVVQ 00002 Khartoum
TVVK 00003 Rabat
TVVM 00004 Kuwait City
TVVP 00005 Abu Dhabi
TVVC 00006 Baghdad
TVVF 00008 Beirut
TVVS 00009 Kuwait City
TVXV 00010 Doha
TVXX 00011 Sana'a
TVXQ 00012 ?
TVXP 00015 Mogadishu
TVXC 00016 Abidjan
TVXY 00017 Muscat
TVXS 00019 Manama
TVQV 00020 Riyadh
TVQX 00021 Tehran
TVQS 00029 ?
XBVX 11101 Bucharest
XBVQ 11102 Paris
XBVK 11103 Bern
XBVM 11104 Berlin
XBVP 11105 Rome
XBVC 11106 Vienna
XBVY 11107 London
XBVF 11108 Madrid
XBVS 11109 Nicosia
XBXF 11118 ?
XBKX 11131 Bern
XBPV 11150 ?
Eastern Europe
QQTX 22201 Prague
QQTQ 22202 Belgrade
QQTP 22205 Moscow
QQTC 22206 ?
KKVB 33301 Addis Ababa
KKVU 33302 ?
KKVE 33303 Bamako
KKVO 33304 N'djamena
KKVI 33305 Dar es Salaam
KKVR 33306 Dakar
KKVZ 33307 Kampala
KKVD 33308 Conakry
KKVA 33309 Lagos
KKXT 33310 Nairobi
KKXB 33311 Kinshasa
KKXU 33312 Accra
KKXE 33313 Luanda
KKXO 33314 Abidjan
KKXI 33315 Asmara
KKXR 33316 Tunis
KKXD 33318 Djibouti
KKVK ? ?
OOVX 44401 Ankara
OOVQ 44402 Beijing
OOVK 44403 Jakarta
OOVP 44405 Islamabad
OOVC 44406 New Delhi
OOVY 44407 ?
OOVF 44408 Pyongyang
OOVS 44409 Kuala Lumpur
OOUS ? ?
Latin America
IPTX 55501 Havana
North America
RCVB 66601 Washington, D.C.

Source: UDXF

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