On Dec 25, 6:21*pm, msg wrote:
Has anyone made any progress investigating the persistent chirp
or sweep signal heard around4800kHz and elsewhere? It is
about S2 to S3 here in No. MN tonight and S9+/-20db in NC/USA
as heard on an internet receiver there.

Michael

? CoDar Like Sounds on 4800 kHz ?

I have it here centered around 4800 kHz [4775 kHz ~ 4825 kHz]
with Signal Levels of S7 peaking at S9.

So How Does All That CODAR Stuff Work ?
http://www.thecoolroom.org/instrumen...ment_codar.htm
http://www.cds.caltech.edu/~shawn/LC...ncurrents.html
* Sounds Heard on 4800 kHz

4800 CODAR "Swisher" a CODAR Transmitter from somewhere
along the Southern California Coast.
http://mt-shortwave.blogspot.com/200...xpedition.html
-source- Shortwave Central Blog {Monitoring Times}

RHF's Alternate Theory - Then again they could be using
it to CoDar Sweep the Lakes {Lochs} for 'Nessies'
http://en.wikipedia.org/wiki/Loch_Ness_Monster
* New Melones Lake & Dam
http://en.wikipedia.org/wiki/New_Melones_Dam
* Lake Don Pedro & Dam
http://en.wikipedia.org/wiki/Lake_Don_Pedro

~ RHF
RHF's Radio Shack in Twain Harte, California -USA-
http://en.wikipedia.org/wiki/Twain_Harte%2C_CA
Shortwave Radio / Receiver and SWL Antenna Info
SHACK INFO = http://tinyurl.com/2skmxm