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Author Topic: 6945-6948U, 02152014,2330utc, some type of data stream?  (Read 2721 times)

Offline Bill F

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6945-6948U, 02152014,2330utc, some type of data stream?
« on: February 15, 2014, 2333 UTC »
any idea what this is?  I've heard it last nite and tonight with just a discone and dipole in the attic. I can imagine what it would be if the good antennas were up.   the signal is strong about s9+20.
Receiver: SDRPlay RSP-1
Antenna:  70 foot long wire

Offline Token

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Re: 6945-6948U, 02152014,2330utc, some type of data stream?
« Reply #1 on: February 16, 2014, 0201 UTC »
This is STANAG 4481 FSK.  850 Hz shift, 75 bd, KG-84 encrypted.  What a lot of people call 850 Hz shift RTTY when they see it, or RATT.  However, the transmitter or the audio is very messed up, and there is a lot of noise in the passband of the transmitter.

T!
« Last Edit: February 16, 2014, 0203 UTC by Token »
T!
Mojave Desert, California USA

Offline RCCI

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Re: 6945-6948U, 02152014,2330utc, some type of data stream?
« Reply #2 on: February 20, 2014, 0246 UTC »
Wow! What a signal----Every night it's been blasting S9+20. Any idea of it's QTH and power output? Hopefully "someday" it will move.  :(
+ Equipment: Yaesu FRG 100B, Kenwood R-1000, Yaesu FRG7,
+ Antenna: 75' dipole, height 21', running north and south.  Chicagoland area.
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Nella F.

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Re: 6945-6948U, 02152014,2330utc, some type of data stream?
« Reply #3 on: February 22, 2014, 0025 UTC »
This is STANAG 4481 FSK.  850 Hz shift, 75 bd, KG-84 encrypted.  What a lot of people call 850 Hz shift RTTY when they see it, or RATT.  However, the transmitter or the audio is very messed up, and there is a lot of noise in the passband of the transmitter. T!

Yeah, but could you dumb it down just a bit what is it?  ??? I'm pretty much still living in analog land.

Offline glimmer twin

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Re: 6945-6948U, 02152014,2330utc, some type of data stream?
« Reply #4 on: February 22, 2014, 0255 UTC »
STANAG4481 FSK ( STANAG= STANdardization AGreement)  is navy HF shore to ship broadcast system.
KCMO  Icom R 75 , SDR-IQ, Grundig Satellit 750 ,Tecsun PL 880, Tecsun PL660 , Tecsun PL380 & PL360  10 meter random wire  w/ RF systems MLB    Alpha Delta SWL DX sloper  
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Nella F.

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Re: 6945-6948U, 02152014,2330utc, some type of data stream?
« Reply #5 on: February 23, 2014, 0014 UTC »
STANAG4481 FSK ( STANAG= STANdardization AGreement)  is navy HF shore to ship broadcast system.

Kool! Thanks!

Offline Token

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Re: 6945-6948U, 02152014,2330utc, some type of data stream?
« Reply #6 on: February 23, 2014, 0133 UTC »
Think of it as modern day RTTY.  It uses the same basic technique as old school RTTY, but it does not carry strictly the same thing anymore.

T!
T!
Mojave Desert, California USA

 


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