priyom.org

4XZ

Enigma ID N/A

Name 4XZ
Frequencies PSK: 3743, 4520, 5512, 6618, 8780, etc; CW: 2680, 4331, 6607
Status Active
Voice N/A
Emission mode Serial tone 2400Bd 8-PSK; Morse code
Location Haifa, Israel
Activity pages

Known counterpart stations

4XZ is the call sign of the Israeli Navy base in Haifa, Israel. It sends large amounts of one-way traffic 24/7, primarily using its proprietary variant of the MIL-STD 188-110 serial tone waveform (since July 2005). A CW version of 4XZ still exists, known for its channel marker VVV DE 4XZ 4XZ = =.

Modem

This modem is a proprietary variant of the well-known MIL-STD 188-110 serial tone waveform. 4XZ broadcasts using it simultaneously on 3743, 4520, 5512, 6618, and 8780 kHz. Most traffic is sent in large batches at H+00 and H+30. More frequencies, in upper bands, are added when Israeli Navy exercises take place.

Sample of a PSK modem broadcast

The same modem is also being used by ships to broadcast to shore stations.

CW

The remaining CW traffic is delivered 24/7 simultaneously on 2680, 4331, and 6607 kHz. At present, it is used to deliver about 900 5-letter group messages a month, and 10 to 30 new ones appear daily. While it still exists, its relevance has been reduced since mid 2000s - for example, it no longer broadcasts weather bulletins. More frequencies, in upper bands, are added when Israeli Navy exercises take place.

Channel marker: (looped)

VVV DE 4XZ 4XZ = =

Example traffic list: (always delivered at full hour):

GN4F NR 123 ES GR 23 = =
GN9E NR 023 OS GR 19 = =
TS7J NR 913 ES GR 21 = =
GN7J NR 813 OS GR 25 = =
GN9E NR 713 KS GR 34 = =

Each item of the traffic list consists of the recipient call sign (letter, letter, digit, letter), the message number, a 2-letter code of unknown purpose, and the group count. All digit sequences in 4XZ are written in reverse order. (due to Hebrew right-to-left writing order)

One message may be addressed to more than one call sign, but this rarely happens. In that case, the call signs are separated by commas. Another form of delivery to multiple call signs, slightly more common, is writing one call sign, "L-", and another call sign - the meaning of this is unknown.

The traffic list occasionally carries service messages, which exist only on the traffic list. There are two types of those:

  • Delete messages: HL9Q NR 723 TO NR 133 QQL (the call sign used in those typically does not receive 5 letter groups)
  • Confirm reception: AM0B QSL NR 13 (the number is not a number of a message)

5-letter group traffic delivered on the CW version of 4XZ heard on 15 June 2014 at 20:11 UTC

Transcript of the above message:

[VVV DE 4XZ 4XZ = =] VVV DE 4XZ 4XZ = = AR AR
NW QTC 1 NR 694 = =
NR 694 LL V DW9Y 638151 KO2F GR 65 = =
IZIZI ABKFU DCXBR LSFGJ QLJQH XFXWH YEPWB EQEHI IEEZG FNEMM
LMHTH DYUSR NHQME LMXYK TOWTM RPEFI YIBGB DYJXN OLQPP MITKD
YZDOK AXQXT FGYMN NEJHG PBZKO LWGXN TSGUR POXYT GASRP XPTZP
JXZJZ GWIKY SKBFU WSQFC FAEYE LOZDJ LBHGS PWYYG GWSKY BRYQR
= = AA GR 04 = =
ZBOTE JKQTB TGCWP YTEJG HEDWP FNUKW ELZCX WKDUU TYXZH MUMUZ
USAFE RGWAC XONXP GSSPY WDXQO ABKFU
NR 694 LL V DW9Y 638151 KO2F GR 65 = =
IZIZI ABKFU DCXBR LSFGJ QLJQH XFXWH YEPWB EQEHI IEEZG FNEMM
LMHTH DYUSR NHQME LMXYK TOWTM RPEFI YIBGB DYJXN OLQPP MITKD
YZDOK AXQXT FGYMN NEJHG PBZKO LWGXN TSGUR POXYT GASRP XPTZP
JXZJZ GWIKY SKBFU WSQFC FAEYE LOZDJ LBHGS PWYYG GWSKY BRYQR
= = AA GR 04 = =
ZBOTE JKQTB TGCWP YTEJG HEDWP FNUKW ELZCX WKDUU TYXZH MUMUZ
USAFE RGWAC XONXP GSSPY WDXQO ABKFU
NR 694 LL V DW9Y 638151 KO2F GR 65 = = AR AR
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