The twisted wire oscillator and GPS jamming, a Sunday adventure

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back...

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d planes:

frequency

on the other PC

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the twist, not much on the number of twists,

l, and give everybody in Pakistan one.

in a strong way, good antenna, good SWR!

Neat! The twisted wire has some L too. Perhaps like a piece of transmission line? What happens with more twists for the same lenght of wire?

George H.

It doesn't take much to trash a GPS receiver: Pg 11 suggests that on 1 picowatt at the antenna will do the trick.

See Pg 6. -110dBm (10 pico watts) without protection.

In 2001, we an unintenional GPS jammer in Moss Landing harbor that was caused by oscillating TV antenna amplfiers. Sorry, but the article seems expired from the GPS World web pile:

It doesn't take much signal. It also doesn't require modulation, although it helps. The receiver front end has so much gain, and has such a low blocking (overload) threshold level, that almost any inband CW signal will cause the front end to rectify and play comatose. My Wavetek 952 generator, using a paper clip for an antenna, will clobber my Magellan SporTrak Map over a distance of about 2-3 meters.

I've resisted the temptation to crosspost this thread to sci.geo.satellite-nav, where you will surely be tried and convicted in absentia for for being a detriment to civilization. It's one thing to do dangerous and absurd things in private. It's another to supply instructions for others to repeat them.

Oh yeah... welcome to the dark side.

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

There are SAW filters for GPSs, often right in the antenna. It is a matter of the market insisting on better filtering. Now of course in-band interference is a hopeless case.

I had read that GPSs don't work well at transmitter sites. This isn't the case with my handheld GPS, but I have noticed the GPS in my phone lose lock when I am near a UHF TV transmitter. Every device has its breaking point.

It's not marketing. It's for cellular handset where the GPS has to operate simultaneously with the cell phone. The 1.9GHz PCS band is far too close to the 1.5GHz GPS frequency to work without filtering. It's especially a problem in mobile telematics antenna, where some clever designer crammed the cellular antenna right next to the GPS antenna. Here's a typical chip:

Yep. That's been my experience. However, it depends on the site. If there's a 1.2GHz ham repeater on the mountain, it's going to have problems. If there's one of the new 700MHz radios nearby, the 2nd harmonic (generated in the front end, not in the xmitter) will cause problems. If there's a TV channel 18 - 24 xmitter, expect problems. I've also seen the problem at an FM broadcast site, but I don't recall the mechanism.

My iPhone 3G GPS works on the local mountain tops. My Droid X GPS does miserably. It starts to have problems about a mile away from Loma Prieta, as soon as we came within sight of the mountain top. I have about a dozen assorted GPS devices, but have never tested them for interference susceptibility (J/S). When I have time and can borrow the necessary test toys...

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

On a sunny day (Sun, 14 Oct 2012 14:53:25 -0700) it happened Jeff Liebermann wrote in :

In these times, where we are on the doorstep of WW3, nuclear at that,

2 extremely aggressive powers USA and China, and not to forget the most powerful one Russia (this is yes, a political statement), randomly killing people (Tibet, Afghanistan, Syria, in fact the real dark lord, a lower IQ example chosen by a lower IQ race, is using drones to kill 'Terrorists'. Well would not anybody who's country was grabbed and their people were killed, by nature have a right to defend them selves, f*ck any 'right', it is the thing to do, to defend yourself, you US make up your own laws, after committing genocide to the native Americans, and to Iraqis, and to so many others, your idiotic law system seems a bit short of explanation to up the concept of 'justice'. In my personal view it is all about the right of the strongest.

Your so called hi tech weapons (price of one missile comes in the millions of $), sure $ is worth nothing due to the black man in the white house printing his own pocket money all the time, but here is the math:

1 million of these little circuits with a rechargeable and a solar cell, at 5 $ a piece, made in say China (where ipods - pads whatever come from), cost the same as ONE missile. So much for you stupid 'high tech ' defeated. Shoot all of them? Aim where?

Hightech is often a big joke, but your MIC (Military Industrial Complex), actually it is a social project (Romney's version of it) to keep people working, based on the Capitalistic misconception that work creates happiness because in that irre work -> money -> BUY BUY BUY == new thing == happiness, well the saints of old already knew that was crap, Jesus turned over the tables in the Synagogue, about you falsely exploiting religion for money and to rule people. In SUCH a world making the antidote to the 'death star' available to the 'rebels' on planet earth is the right thing to do.

Now f*ck your lecturing and crosspost it to wherever you like if you dare.

Greeting, from Luke Skywater!

Target:

powerful one Russia (this is yes, a political statement),

lord,

'Terrorists'.

killed,

thing to do,

the

system seems

$),

own

$ a piece,

ONE missile.

You really are an ignorant piece of crap. They have locked on the target long before your toys would have enough effect.

On Mon, 15 Oct 2012 08:28:24 GMT, Jan Panteltje wrote: (...)

Many years ago, someone was dropping rocks onto the freeway from an overpass. He managed to cause a few problems before he was caught. When asked why he was doing it, the best he could offer was something like "I have the power".

As for what I dare, I dabble in wi-fi and cellular. I've built jammers, created a few exploits, and designed a wireless hot spot range limiter. I've played with almost every wireless exploit and security problem. The difference is that I did it for my education and entertainment, and have chosen not to publish my methods and results. I want to know about the limits of wireless, without destroying it.

If you re-read what I wrote, I suggested that you might be tried and convicted of being a detriment to civilization. GPS has greatly improved civilization and modern life. Yet, all you can think of is its military applications. I never even thought of the military implications of your jammer.

One of the reasons we've survived so long is that we don't go around throwing wrenches into the machinery every time we feel the need. In my never humble opinion, you're no better than the average virus writer and should be treated accordingly.

You can fill in the rest of the lecture yourself.

Whenever I see something like that, I ask myself, what is this person trying to accomplish? Doing dangerous and stupid things to attract attention is something that most of us outgrew as teenagers. Delusions of grandeur are generally reserved for those with political aspirations. So, what were you trying to accomplish? Did you expect the readers to hail you as the conquering hero, having overcome the Evil Empire through the misapplication of technology? Were you surprised that not everyone found value in your accomplishment? If you genuinely wanted to trash the GPS system with your design, you've lost the element of surprise, which again makes me suspect your intentions.

Rather than continue guessing, just what were you trying to accomplish and what were you expecting?

The local maps are inaccurate. Please use: 37.081329N -122.094671W Aim accurately as we have a rare albino redwood nearby that I would like to preserve.

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

On a sunny day (Mon, 15 Oct 2012 09:39:47 -0700) it happened Jeff Liebermann continued his lecturing of right and wrong:

Blah blah, education and entertainment you say. If you had actually read what I wrote you would have found I did it to study the behavior of the twisted wire oscillator clearly not part of your experiences as you did not even address it. Cutting it passed right through the GPS (that is on, as I am writing soft for that).

You are an idiot REALLY, claiming 'civilian use is what GPS is for', NO! GPS was developed by the army for military purposes like guiding missiles to innocent people, bombs, what not. Civilian use came later after Clinton ordered (or rather industry wanted) the inaccuracy scrambling removed.

Most americans are so brain dead that they are now caught up in voting for one or the other puppet of industry, as I pointed out mil industry runs on dead bodies and is the american form of creating jobs for those who cannot do anything else.

You are pestering Russia, your retarded Fuehrer has for his 4 years in office destroyed Lebanon. Egypt, and is busy with Syria, using Turkey and NATO as his tool. That is NOT what NATO was made for after WW2.

But the retard does not know his limits, for sure Russia will consider a first strike. Why does he not care? Because if you study the black race, or Africa, you will see that those have a different brain structure, they have more birth and care less about survival of individual kids / people, their survival is based on numbers (of offspring). For those brain structures a nuclear war is just like an epidemic, like viruses, like the environment they grew up in in Africa. There is an interesting paper here:

So, all those unrests, all those civilians killed, pulling the trigger more and more on WW3, is all build in the US Emperor's genes, he WILL gravitate that way, and probably we are already past the point of no return. With a mad man at the wheel, what more can I do then make counter measures available to all who can possibly have use for it. For the sake of BALANCE.

Your empire is past its top, N America is turning black, your states will fall apart, and your remains will possibly, if the species survives, be dug up by archaeologist of that time thousand years later. They may even find your little toys, none of which helped in any way to avert the argamedon.

Anyways, today I cut some more wire of the twisted wire Armageddon, and went up to 2.4 GHz, added an inverter and level control, connected a video camera (PAL), and low and behold it worked with my 2.4 GHz video receiver (video only), did not bother with the sound. You can see the receiver on the right in one of the picture links I published.

Next is program a PIC so I can dial in frequencies (the counter in that PIC will be frequency counter, and control the osc frequency every 100 ms, PLL). That will make a nice signal generator / transmitter. For the GPS band and the 2.4 GHz band I will need separate oscillators. Then play the constellation data and not only jam it but send a different location / constellation, Thank you for your coordinates.

:-)

On a sunny day (Mon, 15 Oct 2012 12:01:21 -0400) it happened "Michael A. Terrell" wrote in :

1 million x 100 mW in the GPS band makes 100 kW directed at the sky. If you could do the math you would see.

If you could design or build ANYTHING you would show. If you would learn you would shut up.

Hey it might even moonbounce... :-)

From all the collateral damage even now you have no clue what or where the target is, it happens to be in Washington most of the time.

He will never figure that one out :-)

feedback...

planes:

frequency

the other PC

twist, not much on the number of twists,

and give everybody in Pakistan one.

strong way, good antenna, good SWR!

You forgot that a right-hand twist gives right-hand polarization..

He also seems to be unaware that the US Government has actually considered that GPS signals might be jammed or even spoofed. They have ways around that problem... uh, I mean, I expect they do... yeah, it's not like I really know for any reason. Honest... I wouldn't reveal secrets or anything.

Rick

to innocent people, bombs, what not.

inaccuracy scrambling removed.

Not so. Selective availability was turned off in May 2000. We had civilian system in the late 1980's. I was working on DGPS systems using long wave (beacon band) marine transmitters in about

1989. The full constellation didn't arrive until 1994, but there were plenty of civilian users running off what satellites were available. For example, the 1995 Oldsmobile 88 had an optional GPS nav system.

will be frequency counter,

generator / transmitter.

Like this?

Don't forget the various cell phone bands, military aero comm frequencies (225-400MHz), and assorted radar frequencies. This list should help:

location / constellation,

Anti-spoofing is fairly simple, consisting mostly of a sanity check against an inertial reference. Some military systems use pseudolites in the vicinity of the target, to provide stronger signals, for better local accuracy, and to improve the jammer-to-signal ratio.

You're welcome. However, it will be fairly difficult to hit my house. The problem is that I'm surrounded by a thick forest full of 30-50 meter high trees. Using a cruise missile in a terrain following horizontal approach is useless as it will surely hit a tree first. The forest canopy is also very RF absorptive, making radar target acquisition difficult. You might succeed with a near vertical JDAM bomb drop from a slow moving lighter than air dirigible, but anything else that comes in at an angle, will hit the trees before it hits my house.

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

If all else fails, launch more missiles. We have plenty of warheads.

On a sunny day (Mon, 15 Oct 2012 13:00:50 -0800) it happened Robert Baer wrote in :

strong way, good antenna, good SWR!

mm, the 2.4 GHz I have now has not much of a twist:

The length is actual the length of the copper colored part plus the length of the transistor leads etc.

I am not sure a lot of rotation is added with this small a twist (small as in percentage of the length).

On a sunny day (Mon, 15 Oct 2012 18:40:04 -0400) it happened rickman wrote in :

Government and science, is not that mutual exclusive?

Maybe just, without 'revealing' you could study the subject? Then you just might find, and emperor without clothes.

On a sunny day (Mon, 15 Oct 2012 22:32:01 -0400) it happened "Michael A. Terrell" wrote in :

You seem to be one of them. :-)

a strong way, good antenna, good SWR!

the transistor leads etc.

Looks like approx 2cm of #18awg (1mm dia) for an inductance of 15nH. With 0.3pF series capacitance, that appears close to 2.4GHz.

percentage of the length).

The sense changes when the signal bounces off the PCB. Your photo shows LHCP (left-hand circular polarization). When bounced off the PCB, it converts to RHCP (right-hand circular polarization). That also applies only to signal radiated along the axis of the helix. Signals radiated perpendicular to the helix are mostly linear polarization.

You never answered my question. What were you trying to accomplish and what were you expecting?

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

And you're a big dud...

Jan Panteltje schrieb:

to innocent people, bombs, what not.

inaccuracy scrambling removed.

Hello,

that is wrong. GPS was developed for both military and civilian use and there was civilian use before and after the removal of "selective availability".

Bye