ID this digital mode on 6423.5 @ 4-12-2013 2318Z

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n1kgh

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What is this mode on 6423.5?

I've been seeing and hearing this on the 6 and 4 MHz bands for several months, usually in the local evening hours
.
What is this?

It looks similar to DRM.

QTH is Salem, MA.
 

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Token

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What is this mode on 6423.5?

I've been seeing and hearing this on the 6 and 4 MHz bands for several months, usually in the local evening hours
.
What is this?

It looks similar to DRM.

QTH is Salem, MA.

Actual tuned frequency for correct offset is probably 6423.2 kHz, USB mode, tuning to 6423.5 would clip the lower edge off the data stream. This signal is STANAG 4285, often written as S4285. 6423 kHz is a known frequency for S4285.

Compare to my example here:
Modulation Example, digital, STANAG 4285, 6383 kHz, USB, August 16, 2011, 1119 UTC - YouTube

T!
 

n1kgh

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STANAG 4285: Reasonable conclusion

Seen the YouTube video, and that's what it appears to be. I concur on the center tuning; that's what my SDR software defaults to and I tend to go to the center of the modulation. I appreciate the audio samples, but with SDR's one increasingly ID's by sight. Thanks.
 

tip

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STANAG 4285 Decode Sample

Understanding its encrypted, does anyone have an example of what the output of decoding with Sorcerer might look like.

I am decoding a signal that I think is STANAG 4285, but would like to verify what the output would look like.

Here is what I am looking at:

JEXSIHJPTE
NNFNZTQHZY
K
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S
N
AXRGWLHWSP
SCGRJOQ
FA
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AN
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Thanks

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Token

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Location
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Understanding its encrypted, does anyone have an example of what the output of decoding with Sorcerer might look like.

I am decoding a signal that I think is STANAG 4285, but would like to verify what the output would look like.

Here is what I am looking at:

Not all S4285 is encrypted, but the large majority of it is.

There is no good example of what the output of encrypted S4285 will look like since it will, by design, be random and garbage. The best that might happen is repeating frames, but to tell the truth I don’t think I have ever seen that from Sorcerer.

A frequency for the signal you are looking at would help to narrow it down.

T!
 

SCPD

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Location
Virginia
You also need to look at the phasing to make sure the signal the correct baud. For a properly tuned (and strong) signal you should see two small dots. This will tell you it's 600 baud. Whether it's long, short or none is mostly a guess. Usually it's LONG but there's no 'standard' per se.

If you see four dots then it's 1200 baud. Eight dots will be 2400 baud.

Then once the baud is correct, you need to know what data mode they're using. Mostly it's a standard like 5, N, 1 (5-bit, no parity, 1 stop bit) but foreign languages don't always use this...

Here's a great document on S4285 decoding. Try to locate one of the stations listed here for test decoding, such as FUJ. It's transmitted in the clear.

http://www.udxf.nl/Somes Notes on STANAG 4285.pdf
 

tip

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Thanks for the responses.... just what I needed.

Tip
 

SCPD

QRT
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Feb 24, 2001
Messages
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Location
Virginia
FUM Decode

On 8625khz right now @ 0718z is station FUM. The S4285 station is S9+20 at my location and makes decoding rather easy.

Set it for 600L and 5N1 decoding and you'll see this:

Code:
FAAA FAAA FAAA FAAA FAAA
DE
FUM FUM FUM FUM FUM

TESTING TESTING TESTING TESTING TESTING

RYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRY

SGSGSGSGSGSGSGSGSGSGSGSGSGSGSGSGSGSGSG

0 1 2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 1 0

VOYEZ VOUS LE BRICK GEANT QUE J EXAMINE PRES DU GRAND WHARF

FUM 5/6 5/8 5/12 5/16 5/22 S/O
 
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