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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.
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

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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
	Linked from a post on Slashdot today at:
	, this news story
	While most of the post deals with military applications/threats,
	thought this reference to domestic use of jammers was
	"Meanwhile, several Internet sites offer small, localized GPS
	for sale in the U.S. domestic market. These include a "GPS
	an advertised 10-meter to 20-meter range for roughly $200. "Just
	into a standard cigarette lighter with 12 V for power," says the
	 "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
	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--
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	"APRS 101"  Explanation of APRS Path Selection & Digipeating
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	aprssig at lists.tapr.org

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