[Scan-DC] 4739/4740 khz frequency information?

[David L. Wilson]

No, this is definitely CODAR (Coastal Ocean Detection and Ranging or COstal 
raDAR) and also called Seasonde.

Several of these systems are in operation along the US coasts.  They are 
mostly experimental licenses held by universities.
An example is WA2XXF run by Rutgers Institue of Marine and Coastal Science 
which uses 4525-4550 KHz.

The University of Maine School of Marine sciences operates WC2XQH with 4750 
one of its frequencies.  With a bandwidth of 25 kHz or wider perhaps, it is 
a likely candidate.

The University of North Carolina at Chapel Hill operate WD2XAX also in the 4 
MHz band.

There are also operations at 12 and 25 MHz.

Google "CODAR" for more info.

> I suspect you are hearing the Link-11 system.
>
>>Group,
>>
>>I have been hearing some form of data on 4739 and 4730 kHz that I
>>can't identify. I have it listed as an US Navy frequency. It seems to
>>span 2.5 - 3 kHz. It was a chirping sound (wooooop.... wooooop....
>>woooop) at regular intervals with what sounded like some type of
>>packet data in the background centered around 4739 kHz USB. When I
>>flipped to LSB, I just heard the chirps. I have heard it constantly in
>>the past couple days whenever I tune to it and am really curious as to
>>what data type it is and it's use.
>>
>>Does anyone on the list know about this frequency?
>>
>>Thanks much,
>>
>>Jay
>
> -- 
>
> ---
> Chris Smolinski
> Black Cat Systems
> http://www.blackcatsystems.com