[aprssig] GPS Jamming On The Rise

[Greg D.]

Interesting...  So, for us Hams to assist in this sort of DF'ing, all we need is an ICOM R3 receiver?  Are there any other portable receivers capable of covering the 1.7 ghz part of the spectrum?  My Kenwood TH-F6 tops out at 1.3 ghz, as does my old ICOM IC-R7000 receiver.  I figured we'd need to create something custom...

This seems too easy...  Are there jamming sources that aren't as easily detected by a hand-held scanner?

Greg  KO6TH

p.s.  I also experienced the Garmin reverse-jamming scenario.  The solution was to wait (8+ years) for my GPS-III to wear out - the display is getting multiple stripes of bad pixels across it- and replace it with an eTrex Vista HCx.


----------------------------------------
> Date: Sun, 29 Jun 2008 13:16:58 -0700
> From: noskosteve at yahoo.com
> To: aprssig at lists.tapr.org
> Subject: Re: [aprssig] GPS Jamming On The Rise
> 
> 
> Boy!  A web search turns up some in the multi-watt range!!
> 
> RE: Fox hunting the jammers.  
> Here's a good accounting of one such hunt with three jammers!  Amplified TV antennas on boats.
> 
> http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=43404
> 
> Need dimensions on that beam, eh?  I built an 11-element beam for 1296 not so long ago.  I used # 12 solid wire and a DIP IC plastic storage tube boom, and a "half-folded-dipole" driven element design seen on the web.  
> 
> If you're out in the woods, who'll know if you're honing your shills for the real thing.  Call your local FCC office and ask for advice.  I'm sure they'll accept all the expert help they can get when something real hits.
> 
>   Aren't there diff-GPS transmitters at some larger airports -- for testing yout fox hunting equipment?
> 
> 
> RE:
>> ... The Garmin III+ and Garmin V have a nice little birdie on 147.315MHz ... Ian N8IK
> 
>    Yup!  Also found the spur the same way in NW Chicago area.  Glad to hear it's well known.
> 
> 
> 
> RE:
>> What about the idea of using the car radio [for a "fox"] tuned to the
>> station that jammed the Garmin GPS V? ...
>> Brian N2KGC
>> 
> 
> Yep.  also ok.  However, make sure your receiver won't respond to the lower harmonics.  Guess I'll look at my spec analyzer to see if it can see this stuff well enough.
> 
> -- 
> 73, Steve, K9DCI
> 
> 
>       
> 
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