Sat Nav Jammers at Air Bases
in [UK Drivers]
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From: Harry Bloomfield on 21 May 2010 14:14 After serious thinking Mike P wrote : > Does anyone know if the forces use Sat Nav "jammers" around air bases > and sensitive places? > > I was down in Burghfield yesterday. Location here > > http://maps.google.co.uk/maps?f=q&source=s_q&hl=en&geocode=&q=reading&sll=49.560852,1.746826&sspn=2.433568,4.938354&ie=UTF8&hq=&hnear=Reading,+Berkshire,+United+Kingdom&ll=51.405792,-1.024303&spn=0.018954,0.038581&t=h&z=15 > > As I was using the sat nav and still managed to take a wrong turning, > I ended up on Burnthouse lane around the edges of what I think is an > AWE site. > > Suddenly the sat nav tells me I'm doing 144mph in the middle of a > field, the "you're going faster than 90mph" bell is ringing, and it > just went insane, until I got back into Grazely Green. > > I suppose it's some sort of jamming equipment - it did the same on the > way back too. Never done it before, or since. They do run regular jamming excercises. You can subscribe to an email identifying when and where it will take place. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk
From: Dr Zoidberg on 21 May 2010 17:02 "GT" <a(a)b.c> wrote in message news:4bf679cf$0$28206$c3e8da3(a)news.astraweb.com... > "Mike P" <mikewpearson1(a)googlemail.com> wrote in message > news:85d2f3e6-dd05-4346-9d63-12e713cdebb6(a)z17g2000vbd.googlegroups.com... >> Does anyone know if the forces use Sat Nav "jammers" around air bases >> and sensitive places? > > As I understand it, sat navs use line of sight communication with overhead > satellites. So to jam one, you would need to block the sky with a large > sheet of something like metal or a slate house roof! I'm fairly sure you > would have noticed a giant roof over the sky! > No , you'd just need to transmit on the same frequencies so that the signal from the satellite is unreadable. Depending on how large an area you want to obscure , that doesn't need a vast amount of power. -- Alex
From: Ed Chilada on 22 May 2010 04:35
On Fri, 21 May 2010 13:17:21 +0100, "GT" <a(a)b.c> wrote: >"Mike P" <mikewpearson1(a)googlemail.com> wrote in message >news:85d2f3e6-dd05-4346-9d63-12e713cdebb6(a)z17g2000vbd.googlegroups.com... >> Does anyone know if the forces use Sat Nav "jammers" around air bases >> and sensitive places? > >As I understand it, sat navs use line of sight communication with overhead >satellites. So to jam one, you would need to block the sky with a large >sheet of something like metal or a slate house roof! I'm fairly sure you >would have noticed a giant roof over the sky! > >Can a vertical line of sight communication that uses light, be jammed by a >horizontal transmission?? It seems so. You can buy GPS jammers from eBay for �30 or so. They're only about a 10m range but they certainly work effectively. The effects aren't as the OP describes though, they simply reduce the visible satellite count to 0. |