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Help idenfity this Data Mode? Interference?

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WrongwayCorrigan:
Hello all,

I am hoping an SWLer here will be able to identify the transmission I monitored in the link below. Is this a test of a data mode or could it be local interference? The recording will begin with the radio tuned at 4520 kHz SSB. The radio is then tuned incrementally up to 4552 kHz so you can hear how the signal is heard across several frequencies.

Receiver: Grundig G6 Aviator
Anntenna: Telescoping Rod
Place of Reception: Northeastern United States
Date: 07/17/2010
Time: 0630 UTC
Frequency: 4520 kHz to 4552 kHz SSB

http://www.zshare.net/audio/7840650813a21fca/

Seamus:
I believe that's one of the variants of over-the-horizon radar. 
Until fairly recently, I had only heard it on recordings from locations in western- and south-central US.  I've recently started to hear it from time to time on my own radio here in upstate South Carolina, so I presume that whatever system is producing it, they have recently expanded its use.

For what it's worth, the radio here in an Icom IC-718, with a 400-foot wire at about 40 feet, with an apparent north-south bias to the pattern.

SW-J:
Per http://en.wikipedia.org/wiki/Wave_radar possibly http://www.codar.com/

See http://www.codar.com/intro_hf_radar.shtml  "The Unique Nature of HF Radar"

In the FAQ section http://www.codar.com/intro_faqs.shtml they mention some specifics like range and frequency:

Q: How far out will it measure?

A: The range of the SeaSonde depends upon a number of environmental factors (i.e., external noise, significant waveheight, current speeds), location of radar (such as proximity to water, nearby obstructions) and SeaSonde operating frequency (the lower the frequency, the longer the range).

Typical ranges are listed here:

For 4-6 MHz: 160-220 km average during daytime. (With 4-6 MHz only, the range is reduced significantly at night as external background noise rises.

- - - - - - - - - - - - - - - - - - -

RADAR signal received in north central Texas on modest gear: http://www.youtube.com/watch?v=c-T4rTBwpJA

WrongwayCorrigan:
Thanks for the quick ID on this HF radar signal. SW-J your links were helpful to describe this signal in detail. I live fairly close to the Atlantic Ocean, so they must be monitoring currents out there. This is the first time I caught radar of any type. I am hoping to catch more in the future.


 

SW-J:

--- Quote from: WrongwayCorrigan on July 17, 2010, 1628 UTC ---Thanks for the quick ID on this HF radar signal. SW-J your links were helpful to describe this signal in detail. I live fairly close to the Atlantic Ocean, so they must be monitoring currents out there. This is the first time I caught radar of any type. I am hoping to catch more in the future.


--- End quote ---

You're welcome ... in case anybody else is wondering where these CODAR (they call them "SeaSondes' for "Sea Sounders" I suppose) systems are located/originate signal-wise, there is s pretty good map on the CODAR website here: http://www.codar.com/seasonde_world_locations.shtml



Additional: Transmit Power levels and specific frequency range within this detailed product brochure:

http://www.codar.com/images/products/SeaSonde/1A-SeaSonde_v2_20100331.pdf

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