Topband: Followup on the 1915kHz radar signal

Gary Smith Gary at
Mon Dec 15 14:38:51 EST 2014

Nice find, Doug, it sure is a strong 
signal. With my 3 el HI-Z I couldn't guess 
the direction in any real accuracy but I 
had a feeling from the stronger NE 
signals, it was NE & following the 
coastline from my QTH on the ocean in SE 
CT. Indeed NS is right in that line from 
here at 50 degrees north.

Nice to know that the HI-Z is not only 
well directional but is seemingly oriented 

As far as the signal itself, the military 
obviously trumps the civilian needs and I 
guess we can be glad it doesn't drift 
around like the woodpecker did.


Gary, KA1J

> After some Googling and educated guessing, I have determined (and
> received confirmation of) the following:
> - It is a high-frequency surface-wave radar (HFSWR) system, developed
> by Raytheon Canada for the Canadian military. It seems to be a new
> version of the SWR503 MK2 HFSWR system. It is intended to detect ships
> up to 200 miles from a country's coast (EEZ) to protect against
> terrorists, smugglers, and unauthorized fishing vessels as well as
> locate vessels in distress. The present system has been detected at
> 1915, 3250, 4400, and 5300 kHz.
> - It is located at Hartlen Point, NS, near Halifax
>       (point Google Earth to   44 35 29.47 N   63 26 49.68 W  )
> and if you zoom in you can see the 500M long cleared area for the
> towers and the guy anchors.
> - W1FV was pretty close with his estimate of a heading of 75 degrees
> (it is actually 67 degrees from John's QTH).
> - ARRL, RAC, and Industry Canada (Canada's FCC) have been made aware
> of the interference that this signal is causing to amateurs.
> - The frequency band 1850-2000 is a shared allocation in Canada, among
> amateur, radionavigation, and radiolocation services.
> - A previous version of this system was installed in several other regions.
> 1915 kHz is not the primary operating frequency for the system. The
> higher frequencies generally work better for the intended purpose.
> So the mystery is least as far as the source is concerned.
> 73,
> Doug K1DG
> _________________
> Topband Reflector Archives -

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