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[aprssig] GPS Jamming On The Rise

Dave Baxter Dave at emv.co.uk
Mon Jun 30 07:50:05 UTC 2008


More likely (and has been documented in the past) a high harmonic of the
RX's LO is leaking out, and as the GPS signals are barely above noise
anyway, it doesnt take much to disrupt them.
 
73
 
Dave G0WBX


________________________________

	From: Lloyd M. Mitchell [mailto:lloyd at mitchell-web.net] 
	Sent: 27 June 2008 19:42
	To: TAPR APRS Mailing List
	Subject: Re: [aprssig] GPS Jamming On The Rise
	
	
If you're using a Garmin GPS V, I can jam it with my FM broadcast radio
on 94.3MHz at 50 ft.  I imagine the IF freq's are mixing. Took me the
longest to figure out why in the morning drive I could not get a fix,
but the afternoon drive no problem (different stations morning and
evening) of course this was pre-Sirus...

Lloyd KO4L


Become a CoCoRaHs Volunteer - 
Report your local rainfall to the NWS
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--- On Fri, 6/27/08, Stephen H. Smith <wa8lmf2 at aol.com> wrote:


	From: Stephen H. Smith <wa8lmf2 at aol.com>
	Subject: [aprssig] GPS Jamming On The Rise
	To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
	Date: Friday, June 27, 2008, 12:19 PM
	
	
	Your APRS tracker could be getting trashed by the car next to
you!
	
	
	Linked from a post on Slashdot today at:
	     <http://tech.slashdot.org/tech/08/06/27/0426216.shtml>
	
	, this news story
	    
	
<http://sidt.gpsworld.com/gpssidt/Latest+News/National-Space-Symposium-D
ay-3-OCX-and-GPS-III/ArticleStandard/Article/detail/525875>
	
	
	While most of the post deals with military applications/threats,
I 
	thought this reference to domestic use of jammers was
interesting:
	
	"Meanwhile, several Internet sites offer small, localized GPS
jammers 
	for sale in the U.S. domestic market. These include a "GPS
Blocker"
	with 
	an advertised 10-meter to 20-meter range for roughly $200. "Just
plug 
	into a standard cigarette lighter with 12 V for power," says the
web 
	page,
	 "and it will automatically protect you from any GPS tracking on

	and within your vehicle. This is a popular item with sales
personnel and 
	delivery drivers, who wish to take lunch or make a personal stop
outside 
	of their territory or route."
	
	    
	
	
	
	--
	
	Stephen H. Smith    wa8lmf (at) aol.com
	EchoLink Node:      14400    [Think bottom of the 2M band]
	Home Page:          http://wa8lmf.com  --OR--
http://wa8lmf.net
	
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	  http://wa8lmf.net/aprs/JAVaprsFilters.htm
	
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