13033.0 FUF Fort de France, MRT STANAG 4285 24 hrs FAA feed.

[nycrich425]

13033 FUF  Fort de France, MRT , STANAG 4285  this is non-encrypted and runs 24 hours for those wanting to test their decoders. I use a 3000 Hz bandwidth and depending on SDR(Airspy in my case) have to tune lower (1.7 hz). This is an FAA feed most of the time in idle mode.

[~SIGINT~]

21:05 UTC - Good readable. Sorcerer will decode this transmission, 600 Long / Framing: 5N1. This waveform can extend beyond 3 kHz. A receiver bandwidth of 3.2 kHz to 3.4 kHz is good.

You can see in the image below that the waveform starts to roll-off after 3 kHz.



FAAA
DE FUF
ZNR UUUUU
ZUI TESTING
RYRYRYRYRYRYRYRY
SGSGSGSGSGSGSGSG

NNNN

P.S. In Sorcerer, click the Ff icon and select "Filter blank lines". This will remove the extra line feed after carriage return.

RSPduo | Barker & Williamson antenna | Toronto, Ontario Canada

[nycrich425]

Thanks for pointing out the Ff icon, it will be helpful.

[Josh]

When the French Navy comms centre gets traffic the 4285 sig will drop, then restart into a response to the calling ship in the clear that repeats a few times with items like number of messages received, number of messages remaining to be sent to the calling ship, etc, then any further response if needed, then back to the channel marker text.

Typically, ships will call on predesignated qrgs often located a few kc up or down from the 4285 sig, initiated by the ship via ale or 4285, so look for those in the waterfall. Some qrgs will be encrypted fleet broadcasts that simply carry whatever the days broadcast is, with no traffic handling on that channel, other qrgs such as this one handle ship/shore traffic exclusively. Most NATO navies operate in a similar manner as far as 4285 goes.

Halifax, for example, used to send its listening qrgs in the clear in the 4285 channel marker.
10,943KHz S4285 75bps Long
[2016-09-21 17:32:52] NAWS DE CFH ZKR F1 2822 3394 4158 6242 8324 12371 16552 AR

[tiNG]

Hi Josh and all.

...
 Most NATO navies operate in a similar manner as far as 4285 goes.
...

I have to disagree with that. There are only France, Turkey, Italy and The Netherlands using this CARB called system. Norway, Denmark, Germany, Belgium, Spain, Portugal and Greece are using simplex ship-to-shore systems with both stations working on the same frequency. Sometimes Norway uses semi-duplex channels but that depends on propagation issues.

Hope this helps.

Kind regards.