[aprssig] GPS Jamming On The Rise
Dave Baxter
Dave at emv.co.uk
Mon Jun 30 03:50:05 EDT 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
http://cocorahs.org <http://cocorahs.org/>
My homepage is http://tinyurl.com/bsyn9
--- 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
NEW! World Digipeater Map
http://wa8lmf.net/APRSmaps
JavAPRS Filter Port 14580 Guide
http://wa8lmf.net/aprs/JAVaprsFilters.htm
"APRS 101" Explanation of APRS Path Selection & Digipeating
http://wa8lmf.net/DigiPaths
Updated "Rev H" APRS http://wa8lmf.net/aprs
Symbols Set for UI-View,
UIpoint and APRSplus:
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