[KYHAM] 3.993.5 MHz QRM Mystery Solved!

[A. W.]

The "contact us" selection on the DRM website should
offer a satisfying outlet for our frustrations at any
rate.


AW 

--- Ron Dodson <ka4map at ispky.com> wrote:

> Looks like our neighbors to the north have solved
> our KEN's QRM issue on
> 3.993.5 MHz for us.  A few months back one of my 9
> land friends said
> they had heard it was some type of encrypted
> traffic.  
> 
> They have since ID'ed it as Digital Radio Mondiale
> http://www.drm.org/ .
> The DRM signal fits into a bandwidth of about 10 kHz
> (against about 3
> kHz for SSB phone), there is also a wide version
> that spreads over 20
> kHz and a narrowband version 5 kHz wide, the wider
> offering the best
> audio fidelity. DRM uses the COFDM (Coded Orthogonal
> Frequency Division
> Multiplex) modulation. 
> 
> Good news for SW broadcasters I guess, but BAD NEWS
> for anyone trying to
> communicate around them. Not sure what we will do as
> yet.  Moving the
> net would be nice, but finding someplace not in use
> is a problem.
> Indiana, I am told is attempting to move their once
> a week RACES net
> below 3.990, I wish them luck.  
> 
> 73, 
> Ron, KA4MAP
> 
> 
> ---------------------------
> Support Amateur Radio in KY
> http://www.kyham.net
> 


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