HFU HF Underground

Loggings => Other => Topic started by: Bill F on February 15, 2014, 2333 UTC

Title: 6945-6948U, 02152014,2330utc, some type of data stream?
Post by: Bill F 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.
Title: Re: 6945-6948U, 02152014,2330utc, some type of data stream?
Post by: Token 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!
Title: Re: 6945-6948U, 02152014,2330utc, some type of data stream?
Post by: RCCI 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. :(
Title: Re: 6945-6948U, 02152014,2330utc, some type of data stream?
Post by: Nella F. on February 22, 2014, 0025 UTC: Quote from: Token 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!

Yeah, but could you dumb it down just a bit what is it? ??? I'm pretty much still living in analog land.
Title: Re: 6945-6948U, 02152014,2330utc, some type of data stream?
Post by: glimmer twin on February 22, 2014, 0255 UTC: STANAG4481 FSK ( STANAG= STANdardization AGreement) is navy HF shore to ship broadcast system.
Title: Re: 6945-6948U, 02152014,2330utc, some type of data stream?
Post by: Nella F. on February 23, 2014, 0014 UTC: Quote from: glimmer twin on February 22, 2014, 0255 UTC
STANAG4481 FSK ( STANAG= STANdardization AGreement) is navy HF shore to ship broadcast system.

Kool! Thanks!
Title: Re: 6945-6948U, 02152014,2330utc, some type of data stream?
Post by: Token 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!