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Author Topic: 13033.0 FUF Fort de France, MRT STANAG 4285 24 hrs FAA feed.  (Read 1159 times)

Offline nycrich425

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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.
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Offline ~SIGINT~

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Re: 13033.0 FUF Fort de France, MRT STANAG 4285 24 hrs FAA Feed
« Reply #1 on: March 19, 2022, 2139 UTC »
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
« Last Edit: March 19, 2022, 2144 UTC by ~SIGINT~ »

Offline nycrich425

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Re: 13033.0 FUF Fort de France, MRT STANAG 4285 24 hrs FAA feed.
« Reply #2 on: March 21, 2022, 2325 UTC »
Thanks for pointing out the Ff icon, it will be helpful.
Airspy Discovery/SDR Uno MLA30+/W6LVP/Dressler Active Antennas/ Create Log Periodic/AT-GR197
Icom Icom R75/8600/8500/7100/7000/71-Kenwood 5000,
Ham callsign:KN4SCM

Offline Josh

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Re: 13033.0 FUF Fort de France, MRT STANAG 4285 24 hrs FAA feed.
« Reply #3 on: March 22, 2022, 2342 UTC »
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

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Offline tiNG

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Re: 13033.0 FUF Fort de France, MRT STANAG 4285 24 hrs FAA feed.
« Reply #4 on: March 23, 2022, 0815 UTC »
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.
73 & 55
Thomas
Rüm hart – klaar kiming