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Electronic / Signal Jamming & Jammers

escargot

Disciple of Marduk
Joined
Aug 24, 2001
Messages
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Location
HM The Tower of London
Son of star wars leaves drivers stranded

http://www.guardian.co.uk/uk_news/story/0,3604,862399,00.html

"President Bush's son of star wars has neutralised its first targets in Yorkshire even before the British government has given the formal go-ahead for the RAF Fylingdales base on the moors to be used for the project.
The upgrading of the security and surveillance systems at the base, in preparation for an onslaught of peace protesters objecting to the scheme, is knocking out the electrical systems of expensive cars.

Visitors to the beauty spot of Goathland, where the TV series Heartbeat is filmed to portray an idyllic 1960s rural life, have found themselves trapped among its charms.

High power radar pulses trigger the immobilising devices of many makes of cars and motorcycles - BMW, Mercedes and Jeep among them. Many have had to be towed out of range of the base before they can be restarted."
 
keyless locks fail en masse in Las Vegas

http://www.reviewjournal.com/lvrj_home/2004/Feb-21-Sat-2004/news/23271330.html

Valley has keyless encounters of the weird kind


By JULIET V. CASEY, J.M. KALIL and KEITH ROGERS
REVIEW-JOURNAL


Was it the storm clouds, sun spots or Area 51?

By late Friday afternoon, some locksmiths, car dealerships and towing companies had been flooded with calls about mysteriously malfunctioning keyless vehicle entry devices.

There were nearly as many theories as there were lockouts. But there were no firm answers as to why the remote devices stopped working.

"Maybe it's those little green men up north," said Nellis Air Force Base spokesman Mike Estrada, whose own keyless entry system failed. "Are there sun spots? I've been trying to figure it out. It happened to me right after lunch."

Estrada resorted to using his key to unlock his car door, but that set off his alarm.

ABC Locksmiths received 30 calls from drivers stumped by the failure of the key systems. Quality Towing received about 25 calls, and two Ford dealerships reported receiving scores of calls about the problem.

But ABC dispatcher Milo Ferguson didn't need to field any calls to know something was amiss.

"My car is one of them," Ferguson said. "It's some kind of electrical disturbance. Either that or a nuclear bomb went off a few miles from here."

Jerry Bussell, Gov. Kenny Guinn's adviser on homeland security, ruled out terrorism and described the phenomenon as a "frequency problem."

"This is an anomaly that we're going to check out," Bussell said.

The Country Ford dealership in Henderson, which had handled more than 100 calls by late Friday afternoon, contacted the national Ford headquarters for an explanation.

Katie Baumann, service operator for the dealership, said the Ford company headquarters informed her that "a lot of static electricity in the air could be messing up the radio waves" the devices use.

Local forecasters said they doubted the widespread failures could be attributed to any strange weather patterns.

"We've heard about it, and we don't think so," said Steve Johnson of the National Weather Service in Las Vegas.

Friday's cloudy weather made Bill O'Donnell doubt the theory of static interference. O'Donnell, a research associate at the University of Nevada, Las Vegas Physics Department and an electrical engineer, said that in "damp weather like we're having today, there won't be much of a static charge in the air. The charge just won't build up in these conditions."

Another possible source of the problem: the sun.

"Solar flares can produce and eject large numbers of charge particles, and usually the Earth's magnetic field deflects them before they enter the atmosphere," said chemistry and physics Professor Malcolm Nicol, the director of the High Pressure Science and Engineering Center at UNLV. "But if they are very large, they have been known to destroy the electronics systems in satellites and cause other problems down here."

However, the Big Bear Solar Observatory in Big Bear, Calif., reported low solar activity Friday.

According to the Federal Communications Commission, the low-power radio frequency transmitters inside keyless entry devices are similar to those found in other everyday items such as garage door openers, remote-controlled toys, cordless telephones, building alarm systems and the rapidly spreading wireless fidelity computer networks, which are commonly referred to as "wi-fi."

Paul Oei, an electronics engineer with the Los Angeles office of the FCC, said keyless entry systems operate on unlicensed frequencies. The devices can fail when they are near an antenna emitting high radio frequency energy. But that scenario would affect only vehicles in a limited area, he said.

Oei said he has never investigated a problem similar to Friday's phenomenon, but he recalled hearing about an incident years ago in which garage-door openers stopped working in an area when Air Force One was nearby.

"Who knows what the military could be using at any given time?" he said.

At least some Ford and General Motors keyless entry systems use the same radio spectrum bands that are used in military operations, according to the Web site of the U.S. Commerce Department's National Telecommunications and Information Administration.

"These bands are heavily used worldwide for critical military air-traffic control and tactical training communications," the site states.

John Pike, director of globalsecurity.org, a defense and intelligence policy organization based near Washington, D.C., said military technology could easily be responsible for Friday's phenomenon. One such operation is jamming, which involves the release of electromagnetic energy to interfere with an enemy's radar detection capability.

Pike noted that particularly in Nevada, the military has a number of unacknowledged programs in jamming and radar and high-powered microwave weapons, any of which might have the potential to bring chaos to certain frequencies.

Estrada said Nellis officials checked into the possibility that military aircraft capable of sending out electronic jamming signals were involved, but they didn't believe that was the case.

"We've got a jammer in the inventory, but I don't think we've got any out here, let alone flying," he said.

Even if electronic warfare aircraft were flying, they operate at much different frequencies than commercial devices, such as garage-door openers and remote keyless entry systems, Estrada explained.

"The military is certainly capable of fibbing about these things," Pike said. "But, for the military to have done it, they would have to have seriously miscalculated the effects of some test."

Friday's phenomenon occurred as Nellis officials were preparing for next week's Red Flag air combat training exercise. The exercise, which involves dozens of fighter jets, bombers and other military aircraft from around the world, begins Monday and runs through March.

Chuck Clark, of the rural Lincoln County community of Rachel, is an Area 51 watchdog and researcher who monitors the government's classified installation near the dry lake bed of Groom Lake, 90 miles north of Las Vegas.

Clark said some of the high-tech equipment that he and other Area 51 buffs believe exists at the installation routinely cause odd occurrences in Rachel similar to what many people in Clark County experienced Friday.

"We get electronic jamming all the time," he said by telephone.

News reports of a similar phenomenon several years ago in Washington state suggested the outages were linked to the arrival of military aircraft carriers to Bremerton.

In March 2001, the keyless entry failures began at the same time the aircraft carrier USS Carl Vinson returned to Bremerton. Then in April of that year, the outages began one day after the carrier USS Abraham Lincoln arrived at Puget Sound Naval Shipyard.


Review-Journal writers Omar Sofradzija and Carri Geer Thevenot contributed to this report.
 
IIRC there was a car park in Reading (thats a town for Non-UK posters) where the same problem occured. It was put down by local news reports at the time to the proximity of a cell phone aerial.

However the chip that takes the programing for these keys can be corrupted by a strong signal. I was told by an electronic engineering student who was at Liverpool University that a device to do that would be very easy to make
 
That reminded me of a similar situation I had read about in San Diego (like Bremerton, a big USN port city). I turned up the following while looking for that. (Ahhh crud, I see that the article about the LV (not a big USN port city :D) incident mentions Bremerton. Oh well.)

Military May Be At Fault In Balky Keyless Remote Entries
BREMERTON, Wash. -- It ended as suddenly and mysteriously as it began.

The mass failure of keyless remote entry devices on thousands of vehicles in the Bremerton area ended abruptly about 6:30 a.m. Monday, just as federal investigators had nearly isolated the source.

A government official familiar with the Federal Communications Commission's investigation said it is "very possible" the problem could be related to the military presence in the Bremerton area.

The official, who asked not to be identified, said the abrupt disappearance of the interference could be related to the investigation.

The outage was believed to be caused by some kind of rogue signal from electronic communications gear that interfered with the functioning of the popular keyless remote entries.

The mysterious problem began without warning last Wednesday afternoon. That same afternoon, the aircraft carrier Carl Vinson was returning home to Bremerton after seven weeks at sea. Thousands of vehicles were affected, and the condition persisted throughout the weekend.

But Navy officials continued to insist that the Carl Vinson was not the source of the problem.

Senior Chief Petty Officer Larry Coffey of the Carl Vinson's public affairs office said technicians had triple-checked all communications and radar gear on the ship and could find no shred of evidence that the problem was originating with the ship.

Car dealerships in the area said the problem was still continuing as of 6 a.m. Monday but that it had stopped by 7 a.m.

John Winston, assistant chief of the FCC's enforcement bureau in Washington, D.C., said inspectors have been investigating the problem since Friday. But he declined to discuss the FCC's findings until the probe is complete.

Keyless remote entry devices typically use a radio signal in the 150-to 500-megahertz range to lock and unlock a vehicle from a short distance. Most of the devices operate in the 300-megahertz range, said Sam Lee, a technician with AutoLoc, a keyless remote device manufacturer.

Military ships and shore facilities use a variety of communications gear that share those frequencies, but they take steps to ensure that it doesn't affect electronic consumer devices, officials said.

A government official familiar with the FCC investigation said the agency's field investigators used sophisticated mobile electronic tracking devices to pinpoint the source of the electromagnetic interference.

They had isolated the interference to one or two possible sources when the signal abruptly ended Monday morning. The official said it's highly possible that the sources were military facilities, but refused to be more specific.

The possible sources were contacted, and the FCC received assurances that there would not be a recurrence of the problem.
 
an idea....

Has anyone thought to check out what capacity the HAARP project was running at on these particular dates?

Trace[It's a Conspiracy!] Mann
 
A longer article bringing in some stranger elements (and a 911 connection?):

Case of the mysterious mass lockout

06.03.2004
By ROGER FRANKLIN

In a town where the lovestruck can select from a roster of Elvis lookalikes to marry them at 4am, what happened two weeks ago in Las Vegas was pretty strange, even by the locals' standards.

Late on the morning of February 21 - nobody is precise about the exact time, location or identity of the first caller - someone rang a locksmith and complained that the remote-control locking system on the caller's car was refusing to respond.

The old-fashioned key, linked to the same circuitry, wouldn't work either, so could the locksmith fix whatever had gone wrong?

A couple of minutes later, another locksmith's phone rang. Different caller, different make of car, different security system, same problem.

By the end of the day, the best estimate is that police, fire brigade, locksmiths, car dealerships and tow-truck services had received at least 200 calls from stranded motorists. Many who are still puzzling over the February 21 incident put the figure as high as 1000.

"Maybe it's those little green men," joked Mike Estrada, a spokesman for the United States Air Force's Nellis Air Base, which sprawls over 4100 square kilometres of desert 160km north of Vegas.

He was referring to the Area 51 military research facility, which sits in the middle of Nellis' bombing range and where UFO buffs and conspiracy theorists maintain the Pentagon picks apart space aliens and their crashed flying saucers.

While no one seriously blames intergalactic vandals for the lockouts, the general belief in Vegas is that Estrada, whose own car also was locked tight, might have been pointing reporters in the right direction.

The likely culprit, say some, was a top-secret test of equipment intended to fry an enemy's circuitry.

Is this the biggest exercise in paranoia since a drug-addled Hunter S. Thompson mistook the desk clerk at Circus Circus for a man-eating lizard? Only if you label weapons analyst John Pike, director of the Washington-based Global Security think tank, a fruitcake, which he most definitely is not.

"The idea that a military test of some sort was responsible isn't that far-fetched," Pike said, noting that hush-hush electronic weapons and counter-measures are among special projects funded by the Pentagon's "black budget", details of which are withheld even from the congressional Armed Services Committee.

Still, being a man of science, Pike advocates checking the most likely explanations first. Trouble is, none of them pan out.

Solar flares, for example, have been known to scramble electronics. But on the day in question, Old Sol was as peaceful as he had been in weeks.

Static electricity created by unusually dry air is another possibility. But according to weather records, Vegas actually saw a little rain on the day the locks froze shut.

By default, speculation returns to the rumoured goings-on at Nellis. And there the trail is littered with a host of tantalising clues.

Take what happened in March, 2001, when the aircraft carrier USS Carl Vinson returned to its port of Bremerton in Washington State. Automatic car locks went crazy there, too. A month later, when the USS Abraham Lincoln tied up at Puget Sound, the same phenomenon occurred.

And then there was an incident in Los Angeles when Air Force One flew low over the suburbs and garage doors sprang open without prompting. Like car locks, the doors' radio-activated mechanisms are prompted by low-power transmissions similar to those used by cellphones, hobbyists' models, and to relay signals from security systems' motion detectors.

There is another, more contentious, episode worth considering.

On September 11, 2001, after the first three hijacked jets hit the Twin Towers and the Pentagon, the fourth aircraft crashed to earth in Pennsylvania. The official story is that a posse of heroic passengers fought their way into the cockpit, destroying their aircraft and themselves while grappling to reclaim the controls.

Several witnesses reported that the jet was being closely tailed by a small, white, unmarked aircraft. As the pair passed overhead, radios in the vicinity crackled and died.

Could that white jet - whose existence the Pentagon has denied - have been blitzing the larger aircraft with signals to confound its avionics and make it fall from the sky? According to some theorists, and not necessarily the sort who believe in alien autopsies, that is possible, if not entirely probable.


So what of the Las Vegas mystery? What do aircraft carriers, Air Force One and rumours of white business jets have to do with car locks?

Just this: In Iraq, the roadside bombs that have claimed so many US lives are triggered by devices borrowed from things such as remote control locks, cellphones and toys. The last such bomb, which killed three GIs, went off near Baghdad in mid-February - just days before everything went haywire in Las Vegas. Since then, all Iraqi blasts appear to have been detonated by suicide bombers or built-in timers.

Meanwhile, US bomb disposal teams have been defusing the devices in increasing numbers, according to the Pentagon's daily actions from Iraq.

Could the military have used Vegas as a test site for jamming and blocking technology before rushing it to Iraq for immediate deployment in the field?

Pike of Global Security has his doubts, pointing out that while it would be relatively easy to fry 1000 car locks, the military would need to protect its own equipment. But he concedes that such electronic immunity may have been developed.

"It's been widely reported that electronic countermeasures saved Pakistan's President [Pervez] Musharraf by stopping bombs from detonating as planned," Pike noted. "So we know this sort of technology exists, that it is being explored, and that it is being used.

"That said, can we tie what happened in Las Vegas - a genuinely fascinating incident, by the way - to the military? Not on what we know of the technology as of now."

Pike's reservations don't cut much mustard with people who had to pay emergency locksmiths to let them into their own cars in Las Vegas. There, it isn't Estrada's little green men who top the list of suspects, but blue ones - the blue of a US Air Force uniform.

Source
 
The obvious candidates are

a) radar or
b) electromagnetic pulse (EMP) or high-power microwave (HPM) weapon.

Either way it's pretty careless. Anyone who knows how those locks work could probably tell you a lot more.
 
Similar stuff?

CAR ALARM MAYHEM REMAINS A MYSTERY


Confusion was sparked among shoppers at a city retail park when dozens of car alarms all went off at the same time.

The 100-space car park at the Kingsway Retail Park became a scene of confusion and noise on Saturday afternoon as shoppers struggled to get into their cars.

People had difficulty in using the automatic locking system on their key fobs, with many not working at all.

The reason why the alarms were activated at the same time remains a mystery.

Some suggest the problem may have been caused by signals from nearby mobile phone masts - others believe it was caused by radio waves or aircraft flying overhead.

John Davies (57), a court usher from Mickleover, visited the new Marks & Spencer Simply Food store at Kingsway at about 4pm on Saturday.

He said: "When I came out, there was a heck of a din. There were people standing by the side of their cars scratching their heads wondering what had made them go off and how to stop them, I suppose.

"I didn't think much of it until I walked to my car. I pressed the key fob for the central locking and nothing happened. I had to open the door with the key and my alarm went off.

"Others started going off as well. As I drove off, I could still hear alarms going off all over the place.

"I have heard of it before when a mobile telephone mast had been put up and it was affecting all the car alarms."

The problem was confined to the main car park and cars in neighbouring Sainsbury's were not affected.

Mark Kynman, store manager at Halfords, said the store was inundated with people on Saturday who were desperately trying to find out what was happening to their cars.

He said: "One of my staff members said it felt as if the whole retail park had descended on him.

"I have heard that if an aeroplane goes over and hits a certain frequency at a certain speed, it temporarily disables things, such as car alarms."

A spokeswoman for East Midlands Airport said it was unlikely that an aeroplane would trigger that sort of commotion.

Darren Stonebridge, the store manager at Powerhouse, said a lot of customers were talking about the problem on Saturday.

He said: "It's very strange."

Kevin Shaw, a sales assistant at Car Electronics Ltd, in Ashbourne Road, Derby, said it could have been caused by anything from radio signals to a mini earthquake.

http://www.thisisderbyshire.co.uk/d...ayContent&sourceNode=124371&contentPK=9225398

Radio waves interfere with car security

Mar 16 2004


By Patsy Payne


RADIO signals playing havoc with the sensitive security on modern cars left an Epsom motorist unable to start his vehicle.

Gerald Stratton, 69, of West Street, whose vehicle's security system is one of many to have been neutralised by a battery of radio waves coming from an area surrounding Epsom Station said: "I shall never turn my engine off again when I'm near the station. I've learned a lesson."

The phenomenon is common knowledge to rescue organisations such as the AA and RAC, who are called out on a regular basis to "unlock" cars whose key code has been interrupted by high levels of radio waves.

But to the former chief engineer of Epsom Town Hall, it came as a bolt from the blue.

Gerald said: "My friend who had parked the car at the station, returned to it on Friday night and, unusually, it wouldn't start.

"I had a spare key and so, in my disabled buggy, drove down to the station."

But once there, Gerald could still not start the silver Renault Kangoo.

He said: "I was dumbfounded and so called the RAC. I was even more amazed when he said it was quite a common occurrance and that it was because of the higher-than-average radio waves around that area."

But the knight of the road, soon put the trouble right by holding a metallic dog bowl in direct line of the strongest waves coming from the embankment at Epsom station.

Gerald said: "He just manouvered the dog bowl between my steering wheel and walked about until he broke the wave.

"However, I shall never turn my engine off if I arrange to pick anyone up near Epsom Station, as chances are I won't get it started again."

A spokesman for the RAC said the problem had increased as more cars use modern technology such as electronic key fobs and immobilisers.

She said: "Sometimes we have to resort to towing the vehicle away from the area, so it can be opened and started.

"Our advice to people is not to activate their key fob until they get as close as possible to their car. In Mr Stratton's case we suggest he locks the car as usual and uses the key to get in, then once inside press the key fob to stop the alarm.

"In the long-term we suggest he speaks to Renault UK."

http://iccroydon.icnetwork.co.uk/ne...es-interfere-with-car-security-name_page.html
 
I'm open to correction on this but during the 80's in Ireland the IRA had a number of prematurely exploding bombs that killed several of their members. All of these bombs had one thing in common they used video timer mechanisms for detonation. I was reliably informed that the army had a system that could speed these clocks up and hence ..... :(
 
"Has anyone thought to check out what capacity the HAARP project was running at on these particular dates?"

HAARP is the wrong frequency. This would be UHF band, and quite narrow; presumably radar.
 
Possibly relevant:

Can you stop mobile phones from triggering bombs?

Ian Sample
Thursday March 18, 2004
The Guardian

Yes. But that doesn't mean the available techniques could have done much to prevent the terrorist strike in Madrid last week. Spanish investigators believe bombs were concealed on the commuter trains in rucksacks before being detonated remotely by a signal from a mobile phone.

There's nothing new about using a phone to detonate a bomb. As a result, security companies have developed devices that can jam all mobile phone signals within a specific area, just in case. In December, such a device may well have saved the life of President Pervez Musharraff of Pakistan. His car passed by a bomb as it crossed a bridge, but because it carried a device for jamming mobile phone signals, the bomb could not be detonated until he was well clear. "They are certainly in use, there's no doubt about it," a defence analyst told the Guardian.

Few companies in the business of jamming phones for security reasons advertise their services, but Kintex, based in Sofia, Bulgaria, offers a device called the CPJ-010, which claims to do the job. Most jammers work by broadcasting electromagnetic "white noise", essentially a mass of radiowaves that drown out the weak signals transmitted by mobile phones, thus preventing the receiver strapped to the bomb from receiving the call to detonate.

While jammers are undoubtedly fitted to cars used to carry certain high-profile figures, protecting public transport is more difficult. To block out the exceptionally rare mobile phone signal that might be used to detonate a bomb, you have to jam all other mobile phone signals. And unless you know when the bomb is going to be triggered, that means blocking all mobile phone calls all the time. Would the benefit to commuters outweigh the risk?

Even if jammers were fitted to public transport or around busy transport hubs, it's unlikely they would stop a terrorist attack. "You'd just put people on the trains who are willing to blow themselves up," said the analyst.

http://www.guardian.co.uk/life/thisweek/story/0,12977,1171164,00.html
 
An explained electricity outage in Vegas (slightly tenuous link I know but......):

April 12, 2004

Bellagio blackout creates surreal scene

Cause unknown; power could be back on Tuesday

By Mary Manning
<[email protected]>
LAS VEGAS SUN

Rather than the usual sound of casino games, silence greeted thousands of Bellagio guests Sunday, as the 3,005-room resort was plunged into darkness because of a massive power failure.

Hundreds of guests opted for rooms at other Strip resorts as the blackout continued through Sunday night. By this morning, with the power still out, guests were being told they must check out by 11 a.m. and that they could check back with the hotel on Wednesday about future plans.

The outage was expected to last until Tuesday morning.

Early-morning joggers glanced at the still surface of Lake Bellagio, where the dancing waters show had been canceled.

Guests had no phone service, power or water in their rooms. The elevators were out.

Security officers this morning stood at the entrances directing guests to other properties, and barricades blocked cars from entering.

Alan Feldman, spokesman for Bellagio owner MGM MIRAGE, said around 2 a.m. Sunday something caused one of the main power lines going into the Bellagio "to be compromised," which caused other lines to fail. The failure knocked out all of the power except for emergency power.

He said it was unclear what caused that to happen, and he said the company was giving the cable to Nevada Power to investigate.


Early reports of a truck hitting a power line or a power surge were incorrect, Feldman said. There was also no evidence of sabotage, he said.

He said the power outage could be over as early as tomorrow morning. Thousands of feet of cable needed to be pulled out and replaced, he said.

Guests were being moved out of the hotel today to other Strip hotels because the Bellagio's power will have to be shut off so crews can finish the work.

The hotel's emergency power allowed people to get into their rooms using the electric locks and kept emergency lights on. Kitchen workers were able to make a breakfast buffet for guests this morning.

Nevada Power Co. spokesman Edgar Pitano said that none of the equipment that failed belonged to the utility.

The company was called about 2:30 a.m. about the Bellagio blackout, followed by another call that the Monte Carlo had lost power. Backup generators restored electricity at the Monte Carlo, he said.

An employee at Treasure Island said the computers there were down all Sunday.

People in about 2,000 guest rooms at the Bellagio were relocated Sunday. About 800 people who spent the night were sent to other hotels. Another 1,100 people were scheduled to come in today.

The hotel was sold out Monday night, Feldman said.

Guests were being relocated to other MGM MIRAGE properties as well as the Monte Carlo, the Venetian, Mandalay Bay and Caesars. Feldman said there had been "wonderful cooperation up and down the Strip."

Guests who had booked a room would be redirected to other hotels, Feldman said. A performance of "O" was canceled Sunday night as were restaurant reservations.

Deutsche Bank Securities analyst Marc Falcone said the power outage Sunday could have cost MGM MIRAGE about million in lost revenue and about 0,000 in cash flow that day. The company could face similar losses each day in which the outage is in effect, he said.

"Easter Sunday is also typically a slower day and we would assume that the property has business interruption insurance," Falcone wrote in a note to investors today. "The overall strength of the Las Vegas market should also be able to make up for lost business throughout the remainder of the second quarter."

Merrill Lynch analyst David Anders told investors today that the incident is likely to result in a "small one-time charge" that will be reflected in MGM MIRAGE'S second quarter financial results.

Bellagio guests who stayed at the hotel Sunday night compared it to camping out.

"I'm sitting here under a million dollars worth of glass," said Bellagio guest David Tetzloff of Columbus, Ohio, referring to the lobby's art deco glass design by Dale Chihuly, "and watching people explode."

While the casino, restaurants and lounges were eerily quiet, children tired of waiting in check-in lines screamed and their parents dragged them and the luggage upstairs to rooms.

Tetzloff said he arrived at the Bellagio about 6 p.m. Sunday and was informed by a hotel clerk, signing guests in by hand because computers were down, that there was no electricity.

"Just imagine the monumental amounts of money being lost right now," Tetzloff said.

Joel and Diane Epstein of Tampa, Fla., had been at the Bellagio since Thursday and were leaving Sunday night.

"We had a great time," Joel Epstein said. Diana added: "Until this morning when we had no power."

"They (hotel employees) were very orderly about it, and people asked a lot of questions," Joel Epstein said.

However, Kathy Corgon had just been married at the Bellagio's wedding chapel. "The chapel had electricity, but I don't know about our room," Corgon said.

John and Valerie DeLeo arrived at the Bellagio on Sunday from Boston. "First time in Vegas, and everything is shut down," John DeLeo said, smoking a cigarette in the middle of the silent casino.

Jan Sjavik of Norway traveled 21 hours to arrive at the Bellagio late Saturday night to play in a poker tournament.

About 30 minutes into his game, Sjavik said, the lights went out. "I went to bed after that, no lights, no hot water," he said.

Phil Matthews of Oceanside, Calif., another player in the poker tournament, said he was told this morning he had to check out by 11 a.m. He had planned to stay another week before moving to the Horseshoe for the World Series of Poker.

"The lights didn't go out. They more or less blinked and flickered and the generators went on," Matthews said. He had gone up to his room about 3 a.m., and found only one bank of elevators was operating.

"It was a 40-minute wait to get to my room," he said. When he got up Sunday morning, Matthews was going to play in the ,000 buy-in no-limit tournament and learned that that game and the finals of the previous day's game had been postponed.

Bellagio guests were offered free bottled beer and bottled water Sunday night. Apples and bananas were also available.

A pianist and a bass player kept a handful of guests happy with live music in one of the lounges off the main lobby.

Robert Potter, his wife and daughter, all from upstate New York, had settled into the Bellagio for their first Las Vegas visit and walked the Strip all day Sunday.

"It's no big deal," Potter said. "I'd rather be in a blackout in Las Vegas than in New York."

It was 30 degrees in New York when the Potters left."If I sleep, I don't need any lights," Potter said.

As night fell Sunday, the Bellagio stood out as the only dark spot in a sea of bright flashing lights on the Strip.

Jason Epps, 36, a sales representative, and wife Tracie Epps, 38, a bank officer, of Nashville, Tenn., expected more glitter.

"Las Vegas is lights and action, and this looks closed," Epps said. "It's surreal."

http://www.lasvegassun.com/sunbin/stories/sun/2004/apr/12/516675118.html
 
This is along similar lines (or not):

Tuesday, May 18, 2004

Hundreds left stranded after fuel-gauge failures

Apparent problem with gas investigated in Louisville area

By BILL WOLFE
[email protected]
The Courier-Journal


Terra Stribling was in the fast lane on the Snyder Freeway when her Mercury Mountaineer suddenly began to lose power. "When I went to accelerate, nothing happened," said Stribling, 24. "I looked at all my gauges and everything looked great."

But the gas gauge, showing about an eighth of a tank, lied. The sport utility vehicle was running on fumes, and when Stribling slowed below 30 miles per hour, the engine died, power steering disappeared and she was soon stranded on the side of the road.

GAS TIPS
Track your mileage. Multiply the miles per gallon you should expect for your car by the capacity of the fuel tank. The result is how far you should be able to go on a full tank.

One safe approach might be to fill up every 200 miles.

At your next fill-up, check to see whether the amount of gas you pump in corresponds fairly closely to the level indicated on the gauge. A big discrepancy could mean trouble.

Take note if your engine sputters or is hard to start. You could be nearly dry.

Keep your receipts from gasoline purchases and for any repairs you make related to the gas gauge. You may need both later to seek compensation.

Do not carry extra gasoline in your car, even in a safety-approved container. It's just not safe, AAA Kentucky says.

Like hundreds of other Louisville motorists in recent days, Stribling ran out of gas. As though paying almost per gallon wasn't bad enough, fuel-tank sensors have been failing throughout Louisville on different makes and years of cars burning different brands of gasoline. Drivers have been learning they're out of gas the hard way — sputtering to a halt.

No one knows for sure what is causing the problem, but it appears to be something in the gasoline, said Roger Boyd, spokesman for AAA Kentucky, which began getting complaints last week.

State officials are testing samples of Louisville-area gas and the Kentucky attorney general's office is looking into the situation, but no clear explanations were available yesterday.

Garages confirm that something is fouling the sensors, which can cost up to 0 to replace, but typically total 0 to 0.

By Saturday, the Ken Towery service center on Bardstown Road near the Watterson Expressway had five cars lined up for sensor repairs, said assistant service manager Shawn Helvey. "We've had a couple that we had put fuel pumps in maybe two weeks ago" that came back reporting that the pumps were bad, he said. "They were just out of gas, and their gauge was off."

THE PROBLEM hasn't been seen elsewhere in Kentucky, according to Boyd, but similar gas-gauge failures were reported in northwestern Pennsylvania last week, according to the Erie Times-News. One Erie car dealer's service manager said he had seen at least 100 fouled gas sensors in the previous week. The Pennsylvania attorney general's bureau of consumer protection is looking into the matter, the newspaper reported.

In Louisville, AAA received 174 out-of-gas calls from stranded drivers from May 7 through May 13, Boyd said. It typically gets about 60 calls in a week.

Boyd said more than 200 motorists have called the club to tell them about their fuel-sensor problems.

Tim Noland of Fern Creek said his 1999 Ford Expedition ran out of gas on the Watterson Expressway Saturday while the gauge showed that the tank was still one-quarter full.

"Normally, when I get within five or six gallons of being empty, the low-fuel light comes on. It never came on, not even once," Noland said.

The problem appears to be confined almost exclusively to Jefferson County, Boyd said, but not to any one area or brand of gasoline. "We've had reports from virtually every part of the county," he said. "I can't exclude any of the major retailers in town."

A VARIETY of vehicle makes appear to be affected, dating back to 1996 models, he said. Few 2003 or 2004 models have been struck.

Drivers say the problem doesn't appear immediately after fueling up, but "what the gestation period is, we don't know," Boyd said.

An inspector with the Kentucky Department of Agriculture's Division of Regulation and Inspections began collecting gasoline samples from stations yesterday, said Lanny Arnold, manager for the department's weights and measurements branch.

Samples will be shipped today to a lab in Nashville, Tenn., where they will be checked for octane content, ethanol levels and contaminants such as water and sediment. "It'll probably be Thursday before we know the results," Arnold said.

If problems are found in a station, it will be shut down and will be required to empty its tanks and then fill them with fresh fuel, he said.

THE KENTUCKY attorney general's office is also looking into the matter, trying to determine how widespread the problem is, said spokeswoman Vicki Glass. "At this point, we have not gotten any written, formal complaints."

Findlay, Ohio-based Marathon Ashland Petroleum, which owns 35 Speedway stores in Louisville, was also investigating yesterday, said spokeswoman Linda Casey.

"We're as concerned as you would expect," she said. However, the company is "in a quandary, because everything is being tested" before it leaves the terminal, and has appeared to be OK.

"We've had no problems and we have had no customer complaints" with gasoline from Louisville-based Thorntons, said Kelly Kapfhammer, spokeswoman.

She said if its gas were ever found to be the source of a problem, Thorntons would "make it right" with customers.

http://courier-journal.com/localnews/2004/05/18ky/A1-gas0518-6393.html

Emps
 
May 20, 7:25 AM EDT


Air Force Radios Jam Garage Door Openers

EGLIN AIR FORCE BASE, Fla. (AP) -- A new military radio system is jamming remote-control garage doors in communities near this Florida Panhandle base.

During testing last week of the .5 million two-way radio system at Eglin, homeowners in Niceville, Valparaiso and the Crestview area reported that their garage door openers failed to work.

Air Force officials said Tuesday the contractor, Motorola Inc., will try to minimize the problem. Technicians will run the system at slightly different frequencies from those used by garage door openers when another test is conducted Friday through Monday.

"I want my garage door opener to work, too," said Col. Russell F. Miller, commander of the 96th Communication Group.

Lauren Van Wazer, a spokeswoman for the Federal Communication Commission, said if the Air Force has been running the system within its licensed frequencies - the Air Force said it has - then users of garage door openers may have to change theirs.

A similar radio system has been requested for Pensacola Naval Air Station and other nearby installations, according to a Navy spokesman.

http://hosted.ap.org/dynamic/stories/B/BRF_DOORS_JAMMED?SITE=VTBUR&SECTION=HOME&TEMPLATE=DEFAULT
 
I'm increasingly convinced there is some odd EM weapon being tested out there:

Strange Lights Spotted After Power Outage



(CBS 5 News)---It was a power surge that left up to 65-thousand Arizonans in the dark one week ago.

Now, some are pointing to strange lights in the skies as a possible link to that massive outage. The disturbance was large enough to shut-down all 3 units at the Palo Verde Nuclear Power Plant. About the same time as this massive power outage some people in the West Valley spotted something strange hovering in the sky.

Then less than 48 hours later in the same direction of the plant you had THIS captured on video. Astronomer, Steve Kates, known throughout the Valley as "Dr.Sky" says
he believes the video is legit. Kates says he has seen a lot over the years but THIS sighting is special and similar to the "Phoenix Lights" sighting back in 1997.

So what is this? Not wanting to sound like someone out of a science fiction novel Dr. Sky says they're still investigating. But Dr. Sky says regardless of *WHAT* this is...the timing of this showing up.... so close to the Palo Verde Outage is interesting.

http://www.kpho.com/Global/story.asp?s=1958424
 
Originally posted by Emperor


fuel-tank sensors have been failing throughout Louisville on different makes and years of cars burning different brands of gasoline.

We had an outbreak of fuel gauge failures in Ontario last winter. The problem was traced to sulphur in the gas corroding the silver contacts on the sensors.
 
Keyless Remotes To Cars in Waldorf Suddenly Useless


By Joshua Partlow
Washington Post Staff Writer
Monday, July 5, 2004; Page B01

Vernon Garrison was stuck at the supermarket -- outside, actually, in the front seat of a navy blue Caprice Classic that would not start.


His keyless entry remote control, the device that unlocks the doors and also is required to start the engine of his car, had gone haywire again. "I was furious," said Garrison, 67, who owns a gas station and, fortunately for him, another car.

For 20 minutes as he waited for help, Garrison watched keenly as several customers came out of the Shoppers Food Warehouse in Waldorf, aimed remotes at their cars and failed to open their doors. Point, push, nothing. Just as he thought.

"I could see them walk up," he said, remembering that afternoon two months ago. "I'm saying, 'It's not going to work.' "

Matt Drake has seen this, too, and wishes he had an explanation. He works at a Radio Shack across Route 301 from the grocery store.

"Volvo, BMW, Mercedes, it does not discriminate," Drake said, pointing over the counter to the strip mall parking lot. "If every single one of those cars has a keyless entry, every single one will not work."

The sporadic incidents -- at least five days in the past year, by Drake's count -- have become something of a mystery in Waldorf, a sprawling mix of shopping centers and subdivisions in Charles County. But such outages are not unprecedented.

Three years ago, thousands of drivers in Bremerton, Wash., were stumped on two occasions when their push-button remotes proved impotent. It happened in Las Vegas in February, prompting hundreds of calls to car dealerships and locksmiths. And in May, a two-way radio system being tested at Eglin Air Force Base in the Florida Panhandle jammed remote control garage door openers in communities near the base.

In most cases, remote control failure is little more than a curiosity, as drivers can simply use their keys to unlock the doors. Some cars, however, require the device to deactivate an alarm or start the engine. Charles Vernon, a retiree from Accokeek whose remote first malfunctioned at the mall in Waldorf on May 10, said the problem is a safety issue and an inconvenience.

"You don't buy the car not to be able to use it," he said.

There is no shortage of speculation on what is causing the problem in Waldorf. Diana Rucci, the operations director at Waldorf Ford, overheard customers in a local restaurant saying NASA satellites were involved. Others pointed to storm clouds, cell phones, solar flares, the Taliban.

Drake said he's not so sure. "Everybody thinks it's the government," he said with a sly grin. "I think it's aliens."

Tony Rose, Charles County's chief of emergency communications, has heard about the problem but would hazard only a vague guess. "It may be something new in Waldorf, some kind of wireless technology," he said. "But I can't confirm it."

Keyless entry remotes have become standard in new cars in recent years. Of the more than 14 million cars and light trucks produced in the United States last year, 77 percent came with the remotes, up from 32 percent in 1996, according to industry research company WardsAuto.com.

--------------
The tecchnology is similar to that used in garage door openers and remote-controlled toys. The remote acts as the transmitter, sending an encrypted message on a weak radio signal to the receiver in the car, which decodes the message and activates door locks and other functions.

But unlike other more powerful radio signals, keyless entry remotes are not licensed by the Federal Communications Commission. They are allowed to operate on frequencies used by licensed customers as long as their signals are sufficiently weak and don't interfere with others. But because of this outlaw status, their own signals can be jeopardized.

"Car entry systems, they have no rights at all," said Bruce Romano, who works in the office of engineering and technology at the FCC. "If they get interference, that's too bad for them."

Interference can occur when a stronger signal on the same or similar frequency overwhelms the receiver, and the low-powered message from the remote cannot be "heard." An engineer compared the situation to trying to have a conversation at a stock car race, where the roar of the vehicles will drown out the voices.

"In all likelihood, the disturbance is probably some fairly high-intensity signal that is only radiating at certain times, and therefore, it makes it very difficult to locate where the source of the problem is, because it's not always up," said John Daher, a research engineer who studies electromagnetic effects on electronic systems at the Georgia Tech Research Institute in Atlanta.

Some of the devices that have failed in Waldorf operate on a frequency of 315 megahertz. Another common keyless entry frequency is 302 MHz. Both of these frequencies fall within a range licensed primarily for use by the military and the federal government.

In a summary of radio spectrum use from the National Telecommunications and Information Administration, the frequencies in the range from 225 MHz to 328.6 MHz "are heavily used worldwide for critical military air traffic control and tactical training communications." Specific functions include "air-ground-air communications for combat weapons training carried out at and in the vicinity of all major air bases and military training areas worldwide."

"High-powered transmissions in this spectrum from presidential and military aircraft are thought to be responsible for interference," said Mike Swanston, a spokesman for the Consumer Electronics Association. "But the government doesn't have to say what they're doing or how often."

Military radio signals have been implicated in other frequency mishaps in recent years. In Bremerton, the home of the Puget Sound Naval Shipyard, the first outage occurred about the time the USS Carl Vinson returned to port. Less than a month later, the second failure of keyless entry corresponded with the arrival of another aircraft carrier for maintenance, according to news reports. A subsequent FCC investigation could not prove the cause of the outages.

Manufacturers of keyless entry systems say they have been battling interference for years with little recourse. Engineers from electronics manufacturer Lear Corp., based in Southfield, Mich., have made several trips across the country to sites where disturbances have been reported. In the past several years, said Tom Tang, an engineering manager at Lear, manufacturers have improved the keyless entry technology by narrowing the range of signals that can reach the receiver, in effect closing the door on unwanted interference. But an identical or very powerful signal still can foul up the keyless entry.

"These devices by their nature, and because of FCC rules, have to accept harmful interference," said John Dicroce, a product development manager at Audiovox Electronics Corp. in Hauppauge, N.Y. "We can't control any FCC approved devices."

About 15 miles north of Waldorf is Andrews Air Force Base in Prince George's County. Officials there said they have not heard about the disturbances, nor do they have an explanation for them.

However, in Waldorf, along Old Washington Road, a 300-foot-tall AT&T tower built in 1955 has several microwave dishes and a blinking white light affixed to it. The primary function of the tower, known as a "point of presence," is to coordinate local and long distance telephone service, as well as cell phone service. But on certain days, said operations manager Philip Clark, the tower also sends out a different signal.

Clark would not specify the purpose of the signal or when it is used. Another employee, who spoke on condition of anonymity, said the signal was related to "government" work.

"I've had problems with [my keyless entry] also," Clark said. The disturbance "is probably coming from our transmitter."

Clark, who works with AT&T Government Solutions, stood outside what appeared to be a windowless concrete building in front of the tower. The glass front door of the building opened into a small entryway, which led to a second white door. On the wall of the entryway was a circular convex mirror. Hanging next to it was a surveillance camera.

"We don't have a schedule when we use that signal; it occurs when necessary," Clark said. "I think it will go on . . . but we can see about not using that frequency."

A security keypad hung to the left of the white door. As Clark spoke, he smiled. "I didn't realize it was disturbing other folks," he said.

http://www.washingtonpost.com/wp-dyn/articles/A28217-2004Jul4.html

Emps
 
Another report - worth it just for the title:

Mysterous Force Knocks Out Keyless Entry Systems

POSTED: 6:24 am EDT July 6, 2004

WALDORF, Md. -- It sounds like something out of the "X-Files."

A mysterious force is rendering keyless car remote controls impotent in Waldorf.

Some frustrated drivers are looking skyward for the answer. But the experts say the fault isn't with U-F-O's or secret NASA satellites. It's radio interference.

Keyless entry technology uses radio frequencies that aren't regulated by the FCC.

Bruce Romano, who works in the office of engineering and technology at the FCC, says if there's interference, that's too bad. The primary user of that slice of the radio spectrum is the government.

Officials say they'll look into whether the car interference is from military or government transmissions.

http://www.thewbalchannel.com/news/3496404/detail.html
 
Now this sounds familiar (if less advanced then the above would require):

Police test hi-tech zapper that could end car chases

Ian Sample, science correspondent
Monday July 12, 2004
The Guardian

A hi-tech device that can bring speeding cars to a halt at the flick of a switch is set to become the latest weapon in the fight against crime.

Police forces in Britain and the US have ordered tests of the new system that delivers a blast of radio waves powerful enough to knock out vital engine electronics, making the targeted vehicle stall and slowly come to a stop.

David Giri, who left his position as a physics professor at the University of California in Berkeley to set up a company called ProTech, is developing a radio wave vehicle-stopping system for the US marine corps and the Los Angeles police department.

Tomorrow, at the Euroem 2004 science conference in Germany, Dr Giri will describe recent trials of the device. The tests proved that the system could stop vehicles from up to 50 metres away.

The bulk of the device is designed to fit in a car boot and consists of a battery and a bank of capacitors that can store an electrical charge. Flicking a switch on the dashboard sends a burst of electricity into an antenna mounted on the roof of the car. The antenna then produces a narrow beam of intense radio waves that is directed at the vehicle ahead.

When the radio waves hit the targeted car, they induce surges of electricity in its electronics, upsetting the fuel injection and engine firing signals. "It works on most cars built in the past 10 years, because their engines are controlled by computer chips," said Dr Giri. "If we can disrupt the computer, we can stop the car." A prototype is due to be ready by next summer.

The Association of Chief Police Officers confirmed that researchers at the Home Office's police scientific development branch are testing a radio wave vehicle-stopping system. "There's a potential to use this type of device to stop criminals on the road. High speed pursuits are very dangerous, especially in built-up areas," said an association spokesman.

http://www.guardian.co.uk/uk_news/story/0,3604,1259104,00.html
 
Answer to the original Las Vegas story

Engineers unlock mystery of car-door device failures

By KEITH ROGERS
REVIEW-JOURNAL


The persistence of a Las Vegas man helped a team of engineers solve the mystery of malfunctioning keyless car-door devices that has badgered many local residents since a massive outage in February.

Bill Zawistowski, 56, said Wednesday that he was visited at his home by a pair of engineers from Ford Motor Co.'s Dearborn, Mich., office and one from Alps Automotive, which makes keyless car-door devices, also known as key fobs.

He said they used his driveway and his keyless vehicle entry device to help pinpoint where an electronic signal was coming from that jammed the frequency of thousands of key fobs.

"I'm the guy that caused the ruckus," Zawistowski, an electrical engineer, said about the complaints he first raised with the Federal Communications Commission and later the companies involved.

He said he was more persistent than other customers because his wife suffers from a muscle disease and depends on electronic openers to enter their vehicle and the garage.

"Eventually, Ford said they'd come to town," he said.

When engineers Nabil Hachem and Earl Morse arrived Aug. 2 at his house near the foot of Sunrise Mountain, on the east side of the Las Vegas Valley, they tried to no avail to open his vehicle door with a keyless device.

It was similar to what hundreds of motorists experienced across the Las Vegas Valley on Feb. 20 when they were forced to open their vehicle doors the old-fashioned way, with a key.

"When they were six inches away and couldn't get the door open they weren't happy," Zawistowski recalled about the engineers. "But at least they had something that would always fail."

Using Zawistowski's driveway as a starting point, the engineers and Alps' John Cabigao set out to find the offending signal with a signal direction finder mounted on top of a Ford Freestar.

According to a statement from Ford officials, "Tall buildings and other structures that cause signals to bounce around forced team members to drive around for two days to collect multiple readings.

"This exhaustive search led to general placement of the offending signal -- a transmission from the top of nearby Frenchman Mountain," the statement read.

Their search, assisted by a local radio maintenance company, steered them to a faulty radio signal repeater on the mountain that since the winter had been stuck in the transmit mode.

This caused it to send out a strong signal that interfered with the frequency used by thousands of keyless entry devices and remote garage door openers.

Maurice Durand, a spokesman for Ford's western region, said the signal repeater is used to boost radio communications during aerial search and rescue operations.

The repeater switch has since been fixed, he said



Original Story
 
Swan: Well found!! I do like it when these things are sewn up but what a lot of work it took and without that guy being persistent enough to get people motivated..........

Top marks to Ford too.
 
Do hotels jam signals?


As a frequent guest at a Hampton Inn in Salt Lake City, Murray Trepel often finds himself powering down his cell phone and picking up the house phone..'My cellphone seldom works anywhere near the hotel,' said Trepel, the senior manager for a call-center service provider in Logan, Utah. 'Not just in my room, but in the parking lot as well.'.What is going on? Trepel, like many business travelers who depend on uninterrupted service from their wireless company, has a long list of probable culprits - including the building's architecture, the area's geography and the cell phone industry's erratic coverage..But another theory is starting to gain traction among business travelers: Hotels are blocking the signals..They would certainly have the motive to do so. Cellphones have bitten into their earnings. Thanks largely to the preponderance of portables, the profits from in-room phones dropped 76 percent in four years, sliding from $644 an available room in 2000 to $152 last year, according to the hotel consulting firm PKF in San Francisco..The downturn accounted for 10 percentage points of the hotel industry's 36 percent decline in profits during the same period. 'Hotels are unhappy about that lost profit,' said Robert Mandelbaum, PKF's director of research..But are they so unhappy that they are biting back? No way, say hotel representatives. For starters, they point out, cell-phone-blocking devices are illegal in the United States. 'It would also hurt our customers, and it's something we would never do,' said Courtnie Widerburg, the general manager of the Salt Lake City Hampton Inn..Besides, her hotel already offers free local calls and high-speed Internet access, and its franchise agreement limits how much it can bill for long-distance service, she said..Hard evidence is scant that hotels are using jammers - at least in the United States. Last year, a Scottish newspaper reported that phone jammers were being sold to hotels in Britain as tools for increasing revenue from in-room phones..'Harassed by mobile phones or hotel phone system not being used?' asked one of the promotional leaflets distributed to the hotels. 'Then look no further. Purchase a mobile phone jammer for your hotel, restaurant and bar. Small and discreet.'.Loreen Haim-Cayzer, the director of marketing and sales for Netline Communications Technologies in Tel Aviv, Israel, acknowledged that her company had sold hundreds of cellphone jammers to hotels around the world. But asked if any of them were in the United States, Haim-Cayzer said she could not disclose the identity of clients..When a recent PricewaterhouseCoopers survey showed the number of calls made from hotel room phones had fallen by 40 percent during the last four years, the firm's lodging consultants wondered whether hotels were fighting back by investing in wireless jamming technology. An investigation, however, turned up nothing. 'It's possible that there are hotels using cellphone jammers,' said Bjorn Hanson, a PricewaterhouseCoopers hotel analyst. 'But we couldn't find them.'.Then again, it is nearly impossible to prove that jamming technology is being used. 'If you turn your phone on and it says 'no service,' then that's the only hint that you're being jammed,' said Barry Zellen, editor of Technologyinnovator.com, a Web site that covers wireless security issues. 'If you're in an area that has good coverage and you pull into a hotel driveway, and suddenly there's a dead zone, then you can probably speculate that there's something unnatural going on.'.Adding to the intrigue is the fact that the Federal Communications Commission has never issued a fine for the use of a cellphone jammer, according to an agency spokesman. But not everyone sees that as proof that the devices are not in use. 'The FCC rule prohibiting cellphone jammers is unenforced,' said Howard Melamed, the chief executive of CellAntenna, a cellular-communications technology company..The New York Times

http://www.iht.com/articles/537668.html
 
The Netline website seems to back up the trade in these devices, mostly for the prevention of industrial espionage and the like

http://www.netline.co.il/CAA_product.htm

But I would have thought that it was in someway illegal to deliberately interfere with wireless communications.
 
Hmmm, I don´t think the hotels are really entitled to do this. The noise can´t be that bad, as people will be talking and snoring in the rooms anyway. It´s not like a library or cinema. But as far as I know, jammers send out a weak signal all the time. Should be real easy to make some equipment to detect them.
 
I'm a bit puzzled by the statement that it's almost impossible to detect jamming devices. I presume they work on the principle of sending out a signal that intereferes with all other signals, and therefore the jamming signal can be detected and should be locatable (is that a word?) by measuring that signal's strength.

The science behind making mobile phone signals work in built-up areas is very complex, and I think it more likely that this inherent complexity holds the answer rather than having to come up with other theories. It could be that the mobile signals are badly attenuated because of the surrounding buildings, but because this area is frequented by lots of people (because it's a hotel) then it's simply a case of more people being there to notice it. Hotels by their nature are desiged to accommodate many people in a single building, and if the proportion of people who use their mobile phones frequently (i.e. businesspeople on business) is high, then there may simply be too many people for the available coverage to deal with. I used to live opposite Twickenham rugby ground and every match day my mobile phone died because the number of users in such a small area far exceeded the network capacity.
 
BTW it's strictly an outlaw thing, but cell phone jammers are available for purchase, and they do work !!!
 
Last edited by a moderator:
Originally posted by Prof Pretorius
[

BTW it's strictly an outlaw thing, but cell phone jammers are available for purchase, and they do work !!!

They are going to install these in French cinemas and theatres. I understand that they have got ones that let 999 calls though!
 
Another cause:

Posted on Mon, Dec. 06, 2004


Military radio signals could jam garage door openers

WASHINGTON (AP) - Coming soon to dozens of military bases around the country: radio signals strong enough to jam nearby garage-door openers.

Between now and 2008, the military is supplying a new radio system to roughly 125 bases that uses the same frequency as the one relied upon by more than 90 percent of the remotely operated openers, Pentagon and industry officials say.

The military radio signal is sometimes so strong that it overpowers the opener's signal, preventing the door from opening. Or it can also vastly reduce the opener's range, forcing the user to walk close to the garage before it will open.

Unless another solution is reached, the consumer will either have to live with the inconvenience or pay to fix the problem.

The cheapest fix would be to manually replace parts of the opener so it will use a different frequency -- probably a $60 job, said Mark Karasek, technical director of a manufacturers' group formed in response to the military radio rollout. Calling a technician to do it for you will probably run double that, he said.

This presumes consumers figure out what is wrong. When a garage door doesn't open, people will generally replace the battery, then the opener itself. A new opener can run $150 or $200 before installation.

Government and industry officials differ on how widespread the effect will be. The government predicts it will be limited; the industry says it will be worse but wants more information from the military.

``These things are generally in a relatively small radius around military facilities,'' said Michael D. Gallagher, chief of the National Telecommunications and Information Administration, which oversees government use of the airwaves. ``The period of inconvenience is generally around when they start up the system. Generally consumers can try again after letting a short pause go by.''

Linton Wells II, Pentagon acting chief information officer, predicted the effect will only be noticed within 10 miles of a base.

But Karasek said interference may be felt as far away as 50 miles. He estimated that at least 50 million garage-door openers in the United States use the same frequency as the new radios.

Beyond issues of convenience and cost, his group raises safety concerns about people who don't carry house keys being locked out of their homes.

The garage-door opener frequency at issue -- 390 megahertz -- has belonged to the military since around 1950. Openers have legally operated at that frequency since at least the early 1980s, Karasek said.

U.S. law allows low-power electronic devices to operate on military frequencies if they don't cause interference. It was a good frequency for garage-door openers because transmissions can penetrate the doors.

Also, until recently, the military did not employ it often, so the industry did not have to worry about interference. Garage-door openers are too low-powered to have any effect on military communications.

It is unknown how many garage doors are close enough to one of the 125 bases to be affected, and Pentagon officials refused to list which bases would receive the new radios. A spokesman said large bases are among those receiving them.

The interference was first discovered in recent months in two areas where the new radios were tested: Mechanicsburg, Pa., and Eglin Air Force Base, Fla.

In Florida, 127 people living within seven miles of Eglin complained of interference, officials said. In Pennsylvania, where a few bases started using the radios, more than 100 people contacted the local congressman, Republican Rep. Todd Platts, about the problem, an aide said.

Mechanicsburg resident Clifford Jones couldn't open his door at first. Now he can -- by walking to within a few feet of it with the remote.

``It's an inconvenience. It's not a crisis,'' said Jones, who is an advocate for keeping the state's military bases open.

The conflict arises from a radio spectrum increasingly congested by military and commercial users flooding the airwaves with communications, data and signals.

The new radios are part of an $800 million project to use the military's alloted airwaves more efficiently amid ever-growing needs, which now include vast transmissions of computer data, defense officials said.

``We're so dependent on communications and networking devices, and we're going to become more and more dependent,'' the Pentagon's Wells said.

All bases are getting new radios, with 125 receiving those that function at the frequency of garage-door openers. The radios are used for routine and emergency communications and training purposes.

The radios are coming online in at least two more places: Fort Hamilton in New York City and Walter Reed Army Medical Center in Washington, D.C.

The Defense and Commerce departments, the Federal Communications Commission and industry are starting discussions. Base commanders will be instructed to inform nearby communities the interference is coming.

Karasek said a solution may be for the military to program its radios to skip the garage-door opener frequency. Manufacturers may also have to start building garage-door openers that work on a different frequency, or are less susceptible to interference.

------

On the Net:

Safe and Secure Access Coalition: www.safeandsecureaccess.com

The Pentagon: www.defenselink.mil

The FCC: www.fcc.gov

The National Telecommunications and Information Administration: www.ntia.doc.gov

Source
 
The military radio signal is sometimes so strong that it overpowers the opener's signal, preventing the door from opening. Or it can also vastly reduce the opener's range, forcing the user to walk close to the garage before it will open.

And actually having to go to your garage door to open it is such a hassle,

slightly more on topic i know of two places where remote opening devices are jammed, both of which appear to be due to being near powerful transmiters.
 
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