FAQ Cell Phone Signal Jammer

Using a cell phone signal jammer

Because cell phone signal jammer now come in much smaller sizes, they are very simple to carryover around. Transportable personal cell phone signal jammer will fit in to the palm of your hand or basically slip in to your coat pocket. So the next time anyone on your commuter bus refuses to close up, you can reach in to your backpack and turn on a temporary "dead zone" together with your cell phone signal jammer. Then get back to some nice peace and calm.

Range & frequency of cell phone signal jammer

Most cell phone signal jammer only have a range of about 50 to 80 feet and will only effectively jam your immediate surroundings. Cell blabbermouths will think they have hit a dead spot in their cell phone company's coverage until they leave your cell phone signal jammer immediate vicinity. Stronger jammers are obtainable to cover larger structures like office buildings, film theaters and church buildings. They look like a miscellaneous metal boxes with wires protruding and are usually mounted on walls or ceilings (see picture on right).

Most cell phone signal jammer come in 2 versions, one for Europe, North Africa & the Gulf states GSM networks (900 & 1800) & one for the Americas & Canada (800 & 1900 mhz) networks. Make definite you get the right version for your location.

The risks and legality of cell phone signal jammer

The FCC (Federal Communications Commission) in the United States has outlawed the sale and use of cell phone signal jammer because they can in theory interfere with emergency communications between police and rescue personnel, aid in criminal activity as well as disrupt medical equipment like pacemakers.Even though cell phone signal jammer is illegal, it will be difficult for the FCC to catch you. Triangulating the exact position of someone with a cell phone signal jammer will need some fancy hi-tech tracking gear and several personnel.However in the event you do get busted using a cell phone signal jammer, be prepared for a feasible $11,000 fine. Keep in mind, cell phone signal jammer is chiefly intended for military or government use.

Read more:

http://blog.espow.com/what-do-cell-phone-jammers-work-like/

Review of 3.5 Inch Wireless Video Doorbell Intercom

Advantages of wireless video doorbell intercom:
1) Strong anti-interference
2) Large storage
3) Clear night vision

Product details of wireless video doorbell intercom:
1) Intercom 24 hours self-monitoring/ unlocking/ calling
2) Wireless 3.5 inch TFT LCD display screen
3) 2.4 GHz digital transmission frequency
4) No interference
5) Clear night-viewing: 6 infrared LED lights for identifying night-visitors.
6) One camera can connect 4 monitors at most.
7) Pictures storage up to 500pcs, all captured photos with visting time & date
8) Two way of charging, one is USB port, another is adaptor
9) 90 degree for outdoor CAM, wide-angle view; CMOS 30 pixel camera, hight-definition
10) Flexible installation, indoor monitor can be wall-mounted & desktop
11) 16 pcs music for choice while ringing
12) Transmission distance: 500-1000 feet, without blockage.
13) CE standard
14) Elegant appearance, volume & brightness adjustable
15) Electricity & signal & outdoor temperature display fuction
16) Built-in rechargeable Li-ion batteries monitor

Reviews of wireless video doorbell intercom:
This is incredible, I couldn't believe how confortable I am since I got my wireless video doorbell intercom. It works perfectly and you can carry it wherever you want along within the house and still have it doing the work. It comes with inbuilt litium battery and it has a very long duration time. It does everything they say, This is great . Thanks.

How Can You Trip Without a Solar Charger?

A travel portable solar laptop charger is a great purchase for somebody who likes to travel. This transportable energy gizmo is simple to make use of & runs off of the sun's energy. A portable solar laptop charger does not need any international voltage adapters because it seldom needs to be plugged in to electricity. You won't must worry about what adapter is used in the country you are going to; bring your portable solar laptop charger with you.

Transportable energy has long been talked about among fanatical energy conservatists. It no longer is only for those individuals who are against electricity & the overuse of it. Now solar energy is becoming very mainstream & people of all economic levels are using transportable solar energy.

You do not must be very concerned about the environment to make use of solar transportable energy. Although it is a great way to make use of our natural resources, solar energy also offers great benefits to those that use it.

A portable solar laptop charger that operates off of the sun's energy can go anywhere you go. You do not need to have an electrical outlet close by to charge your cell phone. You can be backpacking in the mountains & have your phone continually charging. In case you like to go on road journeys you can set your portable solar laptop charger right on the dashboard & let it charge your batteries or gizmo while you drive to your next location.

The convenience that a portable solar laptop charger brings to a travelers life is not in its portability. Solar chargers are & a great way to economize. In lieu of buying multiple adapters for international outlets, you can use the same portable solar laptop charger in any country you travel. You also won't must own multiple charging devices to power all of your different electrical equipment because one portable solar laptop charger can be used to charge most small electrical devices.

Travelers can use a portable solar laptop charger to charge their batteries. They can also use this type of portable solar laptop charger to power other small electrical devices like radios, MP3 players, & even laptop computer computers. There's lots of varieties of solar chargers available with numerous accessories you can add on. When purchasing a portable solar laptop charger, you are only limited by your own imagination.

Lots of travelers have put off purchasing a portable solar laptop charger because they think these types of chargers will be technologically difficult to operate. But portable solar laptop charger are as simple as any other charging gizmo. You do not need a high tech degree to operate them. Most chargers basically must be set in the sun & plugged in to your gizmo.

Solar energy is not a brand spanking new know-how. It's been around for several years. The portability of portable solar laptop charger has evolved dramatically in recent years. It was three times that you would need to own a immense portable solar laptop charger to draw a small little bit of energy from the sun.

More info about portable solar laptop charger at:

http://blog.espow.com/8-tips-for-you-to-use-your-solar-charger/

5 Interesting Solar Gadgets

Oregon Scientific New Solar Power Stations and Projection Clock

Every year, only some new Scientific Oregon launched a new product, so that the product launch news natural aroused our attention. But we don't have too big for new products, but everyone expected also need not too disappointed, although big changes in product, but its improvement or let person is satisfactory.The first is the new + ECO solar projection table, it contains a removable solar panels and an integrated projectors, can cast time on the wall. Another is the weather, it also Helios with built-in solar panels, predictable current location within 12 hours of the weather, also can show the three locations nearby indoor/outdoor temperature and humidity.According to understand, a product before next month began issuing price temporarily, the product can purchase price now 54.99 dollars.

Muzatch iPhone Solar Charger: The Smallest Solar Charger for iphone

This Muzatch iPhone solar charger is believed to be the world's smallest iPhone solar charger. Although we are not clear, complete with built-in 1000mAh lithium battery time of solar panels or specific location, but from above, panels should be placed on the back of the device. Muzatch MZH - 1200 with four LED lamp, can show the mobile phone battery mode. The device for the iPhone intelligent design, will provide excessive charging, excessive release, short circuit and over-current protection. Charger can also provide battery capacity and safety protection. Lock output.At present, the Muzatch MZH - 1200 iPhone solar charger 49.95 price $, and provide five color choices, including black, silver, green, white and blue.

Solar Pool Heating

The solar heating, swimming pool will provide users with comfortable, avoid the water users for mild carelessly, and cause water into purple lips and teeth, stiff tremble. Etc. Of course, this device is not one, you will become the swimming pool, it is fire, not give bone-chilling cold feeling. Swimming pool will be completely using solar heating. The water heater only connection pool mercury filtration system. Through the heater spiral heat system of sports, the dark water will increase. The spiral device using solar power, about twenty feet long. If you aren't satisfied with it, you can also speed up for swimming pool with four of the water heater, thus speeding up. Product price 199.95 dollars.

Parasia Admetior Solar Thermometer

Now I quickly into the thermometer inspectors, recently occasionally will search the thermometer products. But see much, vision and high, so, most of the thermometer are not the eye. Actually, I request is very simple, the price is reasonable, the battery can need not. This is a thermometer with my standards. It is not as large meteorological offices throughout the forecast, weather conditions, but it is time for users provide guarantees the weather conditions, low and high temperature. In addition, the entire plant operation without the need to change the battery.This device using solar power, adsorption in the surface. It can also adsorption, but in other glass surface is relatively complicated. Chuck, convenient for the user to set in outdoor outdoor temperature in indoor inquires. You can also check the night before. Also, the price is reasonable, for 25.10 dollars.

Bag Solar Charger

If you want to use solar energy is more often, you recommend for a bag, it not only can be used to put small tools can also be for the battery. Your bag, enough capacity, and daily needs no matter where you are, and it can provide your cell phone battery. In addition, you also can show you to the world of environmental protection. It is the solar panels in direct sunlight, will produce three WaDuo energy. Even in the cloudy, it can still for a 1600mAh lithium ion batteries. Of course you also can be stored for these energy use at night. A schoolbag itself can pack 15.4 inch notebook and some small tools. This backpack sells! Cowhide 165.83 or $250.

Wireless Video Doorbell Intercom:Home Security Starts Here

Wireless video doorbell intercom was a gift of technology for some time and need to be safe at home is being felt increasingly. This justifies the need to install more and more.

Why you need a wireless video doorbell intercom
Don’t open the door to strangers! You need a wireless video doorbell intercom to protect your security.You and your family can see and converse with callers without opening the door!Get rid of unwelcome visitors and salespeople safely?- Easily say “no thanks” and hang up!Answer the door from your bedside table if you are unwell or in your pyjamas!

They can help you track who stand in outside her home and at the same time, they can be very
beneficial for children and the elderly as well. Then there are the more advanced in some
countries, namely the ability to record video and capture images and store them in internal
memory. All this can be controlled remotely with a handsfree device that allows one to open
the door without opening it.

Wireless video doorbell intercom is easy to install and fully guarantee the safety, security and mobility. There are many brands on the market facilities offer door phone, ie, Channel, Oracle, Westinghouse, Chamberlain, Sony, Cyrex, and more.

How to install a wireless video doorbell intercom
Both goalkeepers Westinghouse channel offers complete systems installation at home, and high
noise cancellation ensure that no noise or hum while product is in use. The package includes
two units and the range of 1500 feet to ensure good reception everywhere. They are available
under fifty dollars and gave him the power of the brand is a good product to invest in. Another keeper hood that is more expensive and more attractive color video Nutone is obviously the main gate of photomontage. It has a wide angle that lets you placed anywhere without compromise in the coverage area. A short wire brush look to make an extremely high class, night vision can see clearly, even in complete darkness.

The wireless video doorbell intercom is the basis for Oracle that are not necessary for the
development of video. This simple door phone allows conversation with the person on the other
side of the door with the touch of a button. However, the good news is that this campaign
can be extended to more than one high tech gadget, if desired.

It is easy to choose a good product, because these days the market is flooded with options
and that should help keep everyone safe and make life comfortable. With the advent of wireless video doorbell intercom system surveillance, you can now get a video doorbell with a little camera that looks out over your front door area and transmits the signal back to your kitchen (or other room in your house) for you to see who is at the door before actually having to answer it.

More info about wireless video doorbell intercom at:

http://gloria06.vox.com/library/post/video-door-phone-makes-you-feel-safer.html

Aee Mini DV: The Smallest Mini DV in the World

This extremely small digital video camera — md91 aee mini dv captures the amazing actions
of your outdoor pursuits. Being small, it can be installed on your sports equipment, such as
mountain bikes helmets,etc. to record the image in front of your eyes. It is the best device
to keep your exciting outdoor adventures in your mind.


Snapshot function
RTC function
VOX function for easy monitoring and more standing by time
Record only what you want
Provide clip and double pin and other accessories
Better video and audio quality, output: 640X480px 30 fps
Easy operation with double light indication (red and green)
Battery capability check
High speed dynamic recording. Quickly response to light
Thumb size alloy housing, easy for various occasions to recording, surveillance
PC camera function for easy e-life
AVI video format for easy play in PC or upload to video website
Low illumination, high resolution image with 2000K pixels
Build-in Li-battery lasts for 2.5 hours video recording, and more than 250 hours standing by
time in VOX model.
Support 16G memory card (max)
Wide angles clip with all direction bracket to support video shooting from any direction
Flexible installation to fit in all kind of environment


Maybe a lot of people still don't know AEE a lot. AEE company was founded in 1999, the
headquarters is located in China Shenzhen, in the wireless transmission, image processing
and intelligent control has rich experience, with its main technical core. In recent years,
the whole world, the smallest released the portable products, professional DV MD80 in early
2009, the first domestic AEE high-profile appearance, MD80, upgrade products market after
MD90, MD91 successively. The investigations of global minimum DV series, belong to the MD91
mini dv aee is global minimum photographed DV. In their basis of MD80S edition, MD90S motion increased
more professional accessories, such as "tiger" is to add wing, the machine performance to
entertainment. AEE mini DV series, is generally only 50g abroad, called “thumb DV”."

Portable Cell Phone Jammer

The portable cell phone jammer supports 4 signal bandwidths: GPS, CDMA, GSM, DCS. The jammers may involve in the problems of customs / telecommunications regulations. Please consult the relevant law before using it.

It is to be first you have to notice that Mobile Phone Jammers will not be used to import in some certain countries due to the broad casts, licensing or any other restrictions. So please check out the countries telecommunication regulation before placing any order or before going to purchase this. The antenna of this 10-meter range portable mobile phone should be installed before any power supply or it may easily burn your panels.

A mobile phone jammer transmits the low power radio signals to cut up the communications between the cell base stations and the cell phones. You have to know this that it cannot interfere in any communications rather than the cellular phones within any kind of stated regulated zone. After activation of the phone jammer all the idle phones will be indicated as the “NO NETWORK”.

Before using of such kinds of 10-meter range portable mobile phones jammer, you need to know all about the manufacturing specifications of all the parts. The isolating signal bandwidth of this mobile phones in terms of the different sections like for the GSM & CDMA it will be 850 to 960 MHz. The GPS will be 1500~1600Mhz and the DCS & CDMA1900 will be 1805~1990Mhz. The typical coverage of these specifications will be 10 meter and the battery long life will be for 2 hours. The average output power of this portable mobile phone jammer will be 10 dBm. The dimension of the antennas is 95x45x20mm (LxWxD) and the power supply will built in the Rechargeable Li-ion battery. It can be recharged, as you want. The ref manufacturer will be AAVQ9EAS5XHD.

Other more accessories are the car power adapter and the power adapter. There are so many other features of this 10-meter range portable mobile phone jammer. Like this mobile phone jammer will able to provide the other bandwidth configuration as you want and it depends upon the company and the online marketing store that if you want to purchase and collect more than 25 pieces with the exact jamming frequency then there are several companies those which will give you discount offers on every purchase.

More info about cell phone jammer at:
http://gloria06.vox.com/library/post/top-5-spy-gadgets-make-your-spy-dream-come-true.html

A Video Door Phone is not only the Accessory of Your Door

As a vital part of any home, doors have undergone a metamorphosis of sorts and are nothing
like what they used to be.

A vast market exists for door handles, knobs, locks, door closure in materials ranging from
steel, acrylic, wooden, crystal etc., which are available in various shapes and sizes.
Current fittings consume less space and time for installation. You can accessorise doors in
myriad ways so as to make them storage spaces.

Doors can be made to serve many purposes based on how they are accessorised. Zicom
Electronic Security Systems’ 7” Screen video door bell combines many functions such as
verifying your visitors, digital photo frame paired with SD card and audio/video player that
supports MP3. With the digital photo frame, you can even watch movies. It is also equipped
with a remote control.

The outdoor unit has a loudspeaker that makes the users’ voice audible to the visitor and a
camera that captures image of the visitor. The infrared LED ensures clear vision during at
night, the microphone captures the voice of the visitor and the call button is used to
generate a bell sound inside the house and activate the camera.

When technology meets security, it creates an impeccable security system. Fingerprint Locks
opens by designated fingerprint(s), making the key unique and one that cannot be duplicated.
Likewise, Howard Storage World has a massive collection of door accessories which can turn
the doors into innovative storage spaces.

These are highly modern products that can save the storage space in today’s small and
compact flats. These products can be easily adjusted at the doors and include over the door
hooks, a cap rack that can hold up to 20 caps, an ironing hanger hook designed to keep the
ironed clothes, a hanging shoe storage that has optional drawers which can store around 20
pairs of shoes at a time and sweater organisers.

More info about video door bell at: http://gloria006.livejournal.com/2983.html

Criminals Jamming Police Radio and Phone Calls

Abbotsford Police have recently seized a number of the units, department spokesman Const. Ian MacDonald said.Gangsters are using over-the-counter technology to jam critical police radio transmissions and cellphone calls, say law enforcement officials.

The devices, known as cell phone signal jammer, are available online through dozens of websites for under $200, with hand-held models going for as little $80 U.S..

Criminals can employ them for anything from disrupting a patrol officer running a licence plate check after pulling over a vehicle, to preventing emergency response team members from communicating with one another while executing a drug warrant, MacDonald said.

"We have come across, and are familiar with criminal organizations and individuals using cellphone jammers . . . radio-signal jammers and even a GPS jammer. (It) can disable our ability to triangulate on their cellphones, or whatever type of communications they are trying to use. It allows them to go stealth," he said.

Federal and municipal police forces have been aware of the practice for some time, MacDonald said, but are expressing ongoing safety concerns as the technology has proliferated.

"Some (large) jammers have a range of 200 metres, depending on the size, and hand-held ones cover 50 to 80 feet. That's a pretty sizable dead zone," he said.

Another issue that coincides with jamming police communications is the monitoring of them.
Criminals with police-band radio scanners could hear of an approaching law-enforcement contingent intent on serving a warrant and leave the residence, but maintain an ongoing jamming signal, MacDonald said.

That can buy a suspect time to escape.

"They could flee, flip the jammer on and we can be tied up at that place and potentially give them more time. Police might not be able to communicate with each other if (a suspect) breaches a (containment) line," MacDonald said.

"A single officer might not be able to communicate to colleagues that he is now engaged in a foot pursuit," he said, "and that's an officer safety consideration."

More info about cell phone signal jammer at: http://gloria06.vox.com/library/post/cell-phone-jammer-management-deficiencies-highlighted-the-market-supervision.html

Development of Digital Video Doorbell

Security through the development of the 2008 Beijing case found that all TCP / IP technology, semi-digital video door bell products are quite common. Many manufacturers of analog and digital combination of eye-catching semi-digital products, and some manufacturers have introduced a fully digital intercom products have become the development of the 2008 Beijing Security intercom series of outstanding highlight shows, digital products has become on the intercom stresses the importance of indicators of technology development manufacturers.

If the number of homes Matsumoto Smart 880 series is the all IP network transmission of digital building intercom system, door from the room extension to the machine, to the management center (PC) are using TCP / IP data transmission, IP-based networks due to network architecture, network communication with the fastest speed and call features a full range of all households, also have a very powerful system extensions.

This stage, despite the traditional analog intercom systems still account for a large market share, but its shortcomings are increasingly prominent.For example in the wiring structure, the model would signal transmission network is divided into main bus (network) and the branch bus (unit). Device from the management machine, cell door machine, door machine unit, the second confirmed tenants door machine, indoor extension form from the top-down hierarchical bus architecture. Management plane to the cell door machine, door machine is a residential unit trunk bus network, and the second unit to confirm residents door to door machine machine, indoor extension is the second branch of the bus. Both the main branch of the bus or bus, voice, video and control signal lines are required for the laying of a separate dedicated cable, the cable type and quantity will be greater, which gave the system cost and engineering trouble.

Now, half-way digital network approach has been more common, the TCP / IP networking to the cell door machine, door machine unit to the door machine and indoor household use a conventional bus mode. It is understood, the reason is that TCP / IP networking in the wiring, networking, signal transmission, system scalability, feature extensibility, system maintainability, network interference, multi-channel communication capability, etc., is very evident in advantage.

Then compare digital TCP / IP doorbell intercom system, wiring is much smaller and simpler, various signals (audio and video, control) all integrated together in just a digital cable transmission, simplifying the wiring, the installation of the system equipment , commissioning, maintenance is simple.TCP / IP network can not only achieve the sound, image, control signal transmission, but also realized the block of flats, residential intercom equipment all the network. Technology for system and network-based digital system can be used integrated audio and video codec module, ARM platform, its powerful data processing capabilities and hundreds of megabytes of bandwidth makes the original more than a single type of signal into digital signal so that signal transmission change too "simple", the signal quality significantly improved greatly improve anti-interference ability, and can achieve with the cell perimeter alarms, access control, card, and community services system for seamless integration.

Bus system with the traditional analog intercom than IP numbers highlight the feel intercom has the following characteristics: transmission distance without any geographic restriction, extension very easy to upgrade; transmission of audio and video, control signal bus is much better than the traditional way ; allows home alarm, home appliance control, remote monitoring, community service and other functions integrated; installation convenience, reducing the project cycle, saving for the project.
More info about video door bell at: http://gloria006.livejournal.com/2983.html

Can you make a movie masterpiece in 48 hours?

Most movies take years to get made. But the Winnipeg Film Group and Cinematheque are hoping you can pull off a good four-minute short in 48 hours.
The WFG's 48 Hour Film Contest invites would-be auteurs to start a film Friday evening and have it ready for screening Sunday. Competing teams have a choice of formats: playable, non-looped DVDs, aee mini dv, 16mm film or 35mm film.
For the first time this year, teams will randomly be given a genre, line of dialogue/text, and prop/item to include in their film. Contestants pay a registration fee of $10 per team and must shoot and edit the entire film (to a maximum running time of four minutes) in the designated 48 hours using the items chosen.
All films, to a maximum of 25 entries, will premiere at Cinematheque Sunday at 7:30 p.m.
Completed films are to be dropped off at the Cinematheque on Sunday between 5:30 p.m.and 6 p.m.

The WFG's contest announcement contains the following advisories:
You do not have to live in Winnipeg to participate but you must be present at the beginning and end of the 48-hour period to be eligible.
You must register with the $10 entry fee. Cash only.
The entry fee entitles you to two free passes to the screening on Sunday.
No equipment will be provided to filmmakers.
The entered films can be about anything you choose but must contain the randomly drawn items chosen by a team member at registration time.
Please include filmmaker names, title and screening ratio on your DVD.
Prizes will be awarded.
If you are interested in being involved in a film but don't have a team, you could show up at registration and possibly join someone else's team. Editors are needed.
Warning: Films are not screened prior to the première on Sunday so they may contain imagery and situations not suitable for all audiences. Films will not be rated.
The WFG encourages all filmmaking teams to follow City of Winnipeg filming rules and accepts no responsibility for filmmakers while on shoots for this contest. Please act conscientiously while on your shoots.

Find Scalable Solution With a BlackBerry Application Development Company

For mobile phone safety issues, scientists in mobile communication through in-depth analysis of the mechanism of using electromagnetic emission technology, through trial and error, and finally found the effective ways of prevent leak and blocking signal, developed cell phone signal jammer successfully. Cell phone jammer, the use of advanced modern digital communication technology and electronic technology, military anti-jamming develops and produces new intelligent digital integrated system, the digital modulation control mode, through wireless technology control area wireless communication equipment normal communication.

Everyone knows in the same position, different indoor, different time may have great changes of mobile phone signal. According to scientists practical experience, it was found that the change of the value 10dbm can reach the highest power, with the minimum power are 10 times, according to the radio signal transmission distances every doubled, 6dbm power decrease in intensity, 10dbm changes and increase must power equipment may increase redundant, double. Otherwise it will cause the intermittent during operation. In the year of the 24 hours of continuous operation circumstance, this kind of circumstance is not allowed on the high requirements, special occasions such as protracted design according to the highest demand commonly when the signal and power redundancy design, high reliability, confidential for ensuring stable, shielding the effective demand is strictly jamming.

Conversely, in general, only quiet civil in a common conditions can make screen area or shielding rate more than 98%, its operation time, generally does not exceed 8 hours of continuous operation, not more than 1,500 hours. Regardless of how changes in the external environment, the cell phone signal bloker does not necessarily ensure signal of every corner of the screen, that is the basic jamming.

More info about cell phone jammer at : http://secsur.blogspot.com/2010/07/cell-phone-gps-jammer-god-complex-with.html

Criminals Jam Radios, Phones

An increasing number of criminals are using widely available technology to block police communications, according to police.
The devices — known as jammers — can create dead zones where police radio and cellphone transmissions are disabled.
The cell phone signal jammer can be bought on dozens of websites for between $100 and $200, according to Abbotsford police Const. Ian MacDonald.
The devices can create a communications-free zone up to 200 metres in diameter, which can interfere with police operations such as the execution of search warrants, MacDonald said.
Handheld units can deaden a zone about 20 metres wide, he said.
Most devices illegal
"It's a reality in the policing world," MacDonald said of the new technology.
"Dependent on how many of these ultimately make it to market and ultimately are purchased by consumers, it may become more of a reality for us."
Abbotsford police believe a number of the units are in use in the community, but they have not yet seized any, MacDonald said.
Macdonald said a particular concern is police safety in situations where an officer might be calling for backup or help but cannot communicate with others.
More info about cell phone jammer kit at: http://secsur.blogspot.com/2010/07/cell-phone-gps-jammer-god-complex-with.html

A New Cell Phone Jammer: CJAM-CPC

CJAM-CPC is a cell phone jammer to CA Wireless' suite of solutions for controlling the use of illegal or unauthorized cells phones. Based on a cellular testing system, the CJAM-CPC can control and eliminate the illegal use of cell phones by inmates in prisons, criminals during the committing of a crime, or ensuring complete cell phone security within a building. This system can be used for both CDMA and GSM communication, providing both hardware and software interfaces making the CJAM-CPC user friendly.

Designed by cellular engineers, the CJAM-CPC solution monitors and interacts with cell phones by way of RF receivers and RF signal generators for both the Reverse and Forward channels. Using an integrated GPS receiver the CJAM-CPC is capable of precisely timed firing of signals and precise synchronization with the GSM and CDMA networks under test.

The CJAM-CPC can be deployed in its own chassis with connectivity through it's built in Ethernet port. The standalone version of CJAM-CPC provides complete portability allowing the system to be deployed as needed. The self contained model has the keyboard, screen and Ethernet interface built in.






As part of CJAM's Distributed Antenna System (DAS) the coverage area of the system increases to almost any size building. Using the CellAntenna's MOFORSAS, the Multiple Output Fibre Optic Smart Antenna System, and CJAM-CPC can be centrally located covering multiple buildings in a campus. The CJAM -CPC can be used as well in conjunction with CJAM-DT (cellular location system) and CJAM-NF (cellular jamming system) to provide a full solution for cell phone security issues all within a single DAS deployment.

Uses for the CJAM-CPC include:

- Correctional facility control of contraband cell phones by inmates

- Police SWAT teams for controlling communication during raids or hostage situations

- Secure Government buildings including Embassies, and other sensitive high security areas.

- Police Bomb squads used to prevent detonation of bombs.

- Universities for securing examination areas.

- Corporations requiring secure environments free from cell phone security leaks

- Border Patrol reconnaissance

- First Responders to locate / communicate instantly with people underground or trapped due to building collapses or bombs

More info about cell phone jammer at:

http://secsur.blogspot.com/2010/07/gps-jammers-provide-convenience-to-car.html

Cell Phone GPS Jammer: for or Oppose

Every coin has two sides. People around the world have different opinions about cell phone GPS jammer. It’s legal in this country while illegal in another. What do you think of this kind of thing? For or oppose?

Here are some opinions from others:

A: It would be easy to be oblivious to an emergency in an area that size which could encompass hundreds of people (especially a self-absorbed ass who would use something like this). Even assuming you were completely aware of everything going on in your vicinity, I doubt you could sense important incoming calls. I'm sure the gentleman dining at the table next to you won't mind not receiving the call that the hospital finally has a transplant for him. I'm sure the mom sitting three rows behind you at the theater won't mind missing the call from the babysitter that little Timmy swallowed poison.

B: People will die without mobile phones? This didn't seem to be a concern 20 years ago; landlines still exist, so find one. By law in the US business owners can't block mobile phones in their store unless the building was constructed out of resistant material before hand.
It wouldn't be a problem if people used common courtesy on both ends. Eventually this will be solved with the advent of having mobile phones implanted internally.

C: I would only advise using a jammer in places where cellular telephone usage is highly annoying and socially unacceptable.. i.e. a resturant, movie theatre, classroom, etc. Maybe when some retard on the road isn't paying attention because of his conversation too.
Otherwise, I think it would be best to leave people alone. However, in these situations, it is rather difficult to get caught or for the FCC to do anything about it. If you're running it 24/7 out of your apartment and telling everyone about it, then you do deserve to get caught and it would be much easier to find the source of the interference to implicate you criminally.
Everyone loves to huff and puff indignatly on the Internet. The FCC can't do anything more than try to question you (and you can refuse to talk to them) and try to take signal readings outside your residence.

D: The fact is, cell phone jammer really SAVED alot more live then cellphone ever did... How do you think they prevent remote detonation of bombs? Jammer... You guys clearly aren't cops.
You'll be hard pressed to find any US vehicle in iraq not equipped with one, it's the solution to IED, what do you think soldier do to place a cell call? They just MOVE AWAY from the vehicle ( or turn them off, but that rarely happens ). That's all... The exact same thing you do when you get a low signal, you move to find a better one. You see an emergency ( and of course you don't offer to help! hell you're the all important cell guy who's gonna save the day! ), you move a couple of feet and you get your signal back.
Should we blow up moutains because they block signals?

E: great place to use them is where cell phones are not allowed, like at MANY schools, kids use cell phones to cheat on tests. Too bad those select few of cheaters and other inconsiderate people have to ruin cell phones for the rest of us. I have no beef against cell phones, only how they have become (to some people) a necessity for social life. Last time i checked, you did't need to talk to a friend who is cutting school, while your taking a test.

So, how do you think of this problem?

The Cell Phone GPS Jammer: God-Complex with the Ultimate Tech Toy

Did you ever notice that the worst drivers are always the ones on cell phones driving slow in the fast lane (or nearly causing accidents)? Does it strike you as rude when you're stuck in line and someone ahead of you won't get off their stupid cell phone and pay for their purchase? Do you ever wonder who are all these wonderful people who cannot be alone for two seconds without grabbing a cell phone?

Well boys and girls of all ages, it's time to develop a god-complex with the ultimate tech toy: a cell phone GPS jammer.

Some of you will be skeptical at first, but some of you will experience the same -- dare we say it -- nearly orgasmic feeling of being able to disconnect people from their cell phone calls on demand. We wished we could fly when we were ten years old, but we soon realized it was not humanly possible (thank goodness for the safety net!) This dream is for real, however as you really can teach people some phone manners without them knowing about it.

Go into any building where people shop and we're pretty sure you'll find someone who is on the verge of spontaneous combustion thanks to their cell phone being too hot. Do them the favor and end the conversation that "could not wait"; seriously, we can all get in and out of stores, restaurants, theaters, bars, and offices much faster if these folks would just realize that they are so in the way. The cell jammer works best indoors because the walls of a building weaken the carrier strength of cell phones. You on-the-other-hand now have the advantage and can disconnect everyone near you almost immediately. We love when a crowd of people at the auto show get disconnected altogether, and you know what, they just dismiss this odd occurrence and don't talk to each other... You would think they find it suspicious, right? Nope!

Remember, the jammer keeps the carrier signal from the target phone constantly scrambled. If the target is near you in a restaurant or theater setting, you won't be hearing any unique ring-tones that make certain cell phone users so unbearably attractive, that they may become your future spouse -- significant other at the very least.

More info about cell phone jammer at:

http://secsur.blogspot.com/2010/07/how-much-of-cell-phone-jammer-do-you.html

Install a Video Doorbell is Simple

Having an ability to see who is on the doorstep prior to opening a front door makes all things that much safer. As someone approaches the front door, it’s just a case of using a monitor to determine whether its friend or foe. To install a video doorbell is a good idea. And it's very simple to install a video doorbell.

Cameras can activate in one of two ways - via either motion or when the actual doorbell is pushed. This all depends on the type of system installed and the level of protection chosen. The motion detection feature allows a homeowner to know that someone is approaching even before the chimer is pushed.

Features to these video doorbells include - flashing light with doorbell is pressed, infrared night vision mode, tamper detection alarm, motion detection, and TV connector RCA cable to connect the signal up to the television set.

Installing video doorbell is a simple DIY home security project to take on. With a wireless system pulling wires or drilling holes is often eliminated, it a case of mounting the system in the ideal position near the homes entryway, and to position the monitor in a convenient location inside. Batteries in these systems often last six to twelve months, or longer, it all comes down to the model.

On a system that features sound it's possible to have a two-way conversation, ideal in those situation where the visitor is unknown. If the actual monitor is portable, it’s often an opportunity to take it out to the yard, garage or shed so that an caller won't be missed. Although this of course depends on the reach of the signal, some can be restricted to approx. 45 feet or so.

More info about video doorbell at:

http://secsur.blogspot.com/2010/07/video-doorbell-of-7-inch-tft-lcd.html

Video Doorbell of 7 inch TFT LCD

7" TFT LCD Video Doorbell is a popular video doorbell in the near times. It will bring you convenience and you won't be worry about unsafe things. 7 inch Video doorbell is a security product you absolutely need.Always know who is behind your door!This video doorbell is a multi-purpose product for monitoring and visually identifying visitors before letting them in your home! The visitor presses the outdoor section button and the inside station sound will stroke a chime. The visitor will automatically appear on the color monitor and the user has the option to answer or simply monitor the visitor. This system has night vision capabilities, giving you complete images outside in the dark. The entry area can be monitored (audio and video) by pressing the monitor button. This video doorbell is simple to install and will provide reliable, monitoring operation!


Highlights:
7 inch TFT LCD Monitor
Color CMOS camera with 6 LEDs for night vision
Multiple ring tone options
Hands-free intercom
unlock capabilities
Adjustable brightness, contrast, and volume
Camera resolution 510*492(NTSC),380 TVL

Specifications:
7" TFT LCD Monitor
Hand-doorphone /handfree design
Support Color & B/W. CMOS & CCD
Support lots of apartment intercom systerms
3 Music selectable
Audio and video out
Unlock and observation
6 infrared night vision
Volume brightness
Contrast adjustable
Working power consumption ≤3.6W
Resolution 628*582
Visual angel (U/D/L/R) 60 x 35 x 70 x 70
Camera sensor: 1/3 Color CMOS camera
Camera resolution 510*492(NTSC),380 TVL
Illumination 0 lux/F1.2
Lens angle 65 degree
Infrared length 1m

Why We Need a Video Doorbell?

Video doorbell can increase your overall safety at home or at your business by allowing you to see who is at the door before you decide to open it or not open it. There are many stores on line or else where have a variety of video doorbell from high end models to more economical ones which produce images in both color and black and white.

A video doorbell system works with a camera unit mounted outside the entrance door (or designated area) and a display monitor installed inside your home (or business) showing what the camera is pointing at. Typically when someone presses the call button on the outside video intercom unit or rings the door bell it activates the camera and alerts the indoor monitor. You can then talk to the person as you look at their image.



Some video doorbell units have built-in memory that will record the images of visitors who ring the buzzer. The memory will hold a time and date stamp as well. In addition, some higher end vedio doorbell has a built in open button in which you can lock and unlock your door to allow visitors in.

The lower priced video doorbells are usually black and white and come with basic features. While the higher priced video doorbells are colored and incorporate the features of a surveillance system with built-in infrared lights that will allow you to see your guests at night. Some systems might even have a manual turn on function in case your visitor knocks rather than rings the door bell.

GPS Jammers Provide Convenience to Car Thieves

People always respect that tech is used to fight crime, but the opposite is that the bad guys only to get better gears. The sole crime-fighter who manages to always have the better gadgets is Batman. Now car thieves are using cell phone gps jammer to jam the satellite signals so that some antitheft services used to locate stolen automobiles are cease to be effective.

It’s not hard to do, either. A quick Google Shopping search for GPS blockers shows models on sale for under $30. They don’t even need to be powerful. In order to swamp the incoming satellite signals, a jammer only needs to put out two watts of power. Speaking at a symposium, Bob Cockshott of “cybersecurity” company Digital Systems KTN said that “the strength of a GPS signal is about as strong as viewing a 25-watt light bulb from a satellite 10,000 miles away.”

It’s not just criminals who are using this tech, either. Employees whose cars are tracked by their companies use them to go off the clock, and according to The Guardian, German truck drivers use them to “to evade GPS-based road charging.”

But knocking off gas-guzzling cars and sticking it to the man are just the annoying part of the potential for GPS jammers. A 20-watt unit would be enough to cover a commercial airport, with rather scary results.

There is also the possibility of feeding false signals to a GPS unit, which would be harder for an operator to spot than straight-up jamming. If you start doing that to boats driven by sailors with no sextant experience, you get havoc.

Still, something good could come of this. It’s possible that people read the story could become not as much as they trust their in-car sat-nav units and actually look through the windshield once in a while. This would reduce the possibility of the estimated 300,000 crashes caused in Britain every year by people who over trust their GPS.

Shouldn’t Cell Phone Mania be Kept within Limits?

Almost twenty seven years passed, when the first commercial wireless call was made and it was Oct. 13, 1983, at Soldier Field, where Ameritech Mobile, now part of Verizon Wireless, made the call from a Motorola DynaTAC 8000X known as the "brick" phone. The phone priced $3,995, was 13 inches long, and weighed 1.75 pounds.

With the advent of cell phones world has become quite small and easily accessible, however cell phones have always been instigating debates among the people about their advantages and disadvantages. The cell phones have numerous uses ranging from business work, means for entertainment, research work, and ensuring security. However, it is estimated that for a commoner, 90% calls are completely unnecessary, and another 5% are less than urgent and could wait until later. There are also plenty of narcissistic pinheads who can't make a trip to a grocery store, to a movie, to mosque/other religious place, or anywhere else without hearing themselves talk on the phone. Some of them can't even sit through a traffic light without placing a call. In the worst case, there are those self-important egotists who do not and will not turn off their phones at a places where switching off their mobiles is mandatory.

Shouldn’t Cell Phone Mania be Kept within Limits?

Since so many people have been annoyed and inconvenienced by the ubiquitous abuse of cell phones, new innovation would lead to simple solutions, and in many other countries, the solution is the portable cell phone jammer. The jammer sends out a blanket of noise in the same frequency range as the cell phone, and by raising the noise floor, makes it impossible for the phone to stay connected. The cell phone user doesn't know the cause of the interruption, in most cases, and just puts off the conversation until later.

In various countries, museums and restaurants use full-time cellular blocking, because, as many people around just won't cooperate and turn their phones off. Jamming is only permitted in countries where the overall benefit to society is more important than some individual's hurt feelings. So, the use of a cell phone jammer may be illegal, yet there are those who are so irritated by mobile phone addicts that they don't mind taking the risk of operating outside the law for a few seconds at a time in order to cut off someone else's conversation, especially when that conversation seems to go on and on, and seems to get louder and more frivolous with every passing minute. Mobile phones operate by sending signals along a range of the electromagnetic spectrum reserved for their use. All a cell-phone jamming device needs to do is broadcast a signal on those same frequencies, and it will interfere with any devices trying to transmit in that range. The phone's screen will simply indicate that no signal is available.

3 Questions of Cell Phone Jammer

What is cell phone signal jamming and cell phone signal jammer?
Popularly says, cell phone jamming is not receiving signal and the paucity of an electronic against mode, and the cell phone signal jammer is a device for jamming mobile telecommunication CDMA and GSM, DCS and PHS etc of frequency electronic counter, use frequency sweep and some frequency control technology, combined with a mobile phone off base of contact between the signal to block truncation phone signal.

Is the effect of cell phone signal jammer the same between GSM and CDMA? Because the CDMA mobile phone anti-jamming performance is far superior to the GSM mobile phones, therefore, for CDMA mobile phone signal blockers effectively shielded distance than the GSM mobile phones, but the difference is not big. It also reminds users, in some special place shall, when necessary, increase the phone signal blockers field, in order to ensure the effect of CDMA mobile phone screen.

Is the effect of cell phone signal jammer the same between in indoor and outdoor use range? The mobile phone signal blockers effectively screen distance refers to indoor distance. Outside, the open areas can effectively shielded from hundreds of meters. Be still, whether in outdoor, indoor use, shielding the effective distance and environmental conditions. As far away from the base, and put in position. Therefore, the use of mobile phone signal shielding, should fully consider the factors, avoid to produce screen corner and shielding effect.

The Classification of Cell Phone Jammer

Do you know how many kinds of cell phone jammer in the world. What are they?

According to the internal structure, there are only two kinds of cell phone jammer. One kind is circuit, another is recessed module.Their advantages and disadvantages are:

1, the cost of the mobile phone is circuit inside: low cost blockers, recessed module structure of mobile blockers cost is high

2, cooling effect: circuit boards electronic components Co., LTD, is not suitable for high-temperature working continuity, But the cavity with separate module structure of radiator, suitable for long time continuous work

3, service life: electronic components made corresponding mobile phone short life is shortened lifespan blockers, 1-2 must be replaced, Cavities and module structure of mobile blockers even long-term continuity, generally can use 7-8 years

4 and maintenance: general damage, the basic circuit will directly replace product and cavities module structure to the mobile phone blockers module can replace problems

5 and upgrade: circuit can't upgrade, recessed module can be upgraded to adapt to the market more changes

6 and applicable occasions: circuit structure of mobile blockers commonly used for civil places, such as school examination, small meeting rooms, etc. Cavities and module structure of mobile blockers are commonly used to compare strong and continuous professional work of special place, such as the concert hall, large theatres, prisons, detention, special secret places, etc.

Let Robots be Your Guids to Shanghai Expo 2010

Toilet deodorant, gate mousetrap, talking trash classification, multifunctional mouldproof chopsticks cage, school intersection traffic intelligent robot system, standby electrical automatic shutdown delay energy device... The daily life of the details, mostly from covers the inventions and pupils are "encounter difficulties suddenly thought of."

The Expo Robot
"We built the world expo with blocks simulation of national construction in China, through an intelligent robots as guide, you feel the charm of life science and technology change." Chengdu, the design of "three classmates robot, guide the Shanghai expo attracts many visitors. Intelligent robot entered the China Pavilion with ultrasonic sensors, the elevator door, visitors each booth, including energy conversion system, intelligent take a canopy and lightning tracking system.

Intelligent Cell Phone Jammer
"How doesn’t my cell phone go?" "Mine also." While many visitors walk in a phone booth call before touching, chengdu, shen YangJinYue in seven former into WangMoLin and enthusiasm for all solved the mystery.
"With the popularization of mobile phones have become interference, the chief culprit of class in order." YangJinYue said, the existing mobile phone use of high frequency signal blockers suppressed, the health of people will produce certain effect. In the classroom and their environmental smart cell phone jammer, through introducing digital micro processing system, realize the working state of intelligent signal interference suppression, thus greatly reducing power, working time is shortened, also can achieve the purpose of environmental protection.

Trash can say thank you
"Please delivery can recycle trash, thank you!" Audio classification trash, bottom installed a voice device, can be induced to throw rubbish issued warnings. Though the design principle is very simple, but his childhood environmental protection and energy saving habits.

Attendance for Intelligent Control of Electricity
"Low carbon" culture is a kind of life habit, a bit of starting from around the habit of saving resources. This system to attendance and light, power lines, etc, and through the existing control organic combination instrument as signal input, a single chip microcomputer as the new information processing unit, so as to realize the attendance will care about their employees with energy-saving and behavior in a safe manner, "this combination can avoid the office, after lighting, no office air conditioning, computer and other electric equipment to open wasteful phenomenon."

The Effects of Cell Phone Jammer Spread to the Street

Seattle, Washington (GlossyNews) - instant wealth was awarded to free mobile company, invented a cell phone signal jammer called "the silencer." The creation of new mobile phone users close any excitant near that they couldn't work properly. It is in this demand, they can be found. The silencer will shut up any phone anytime within 30 feet of the radius of the user. This machine is the benediction quiet, gentle, quiet, thousands of customers have them.

The silencer performance index of the signal frequency interference only mobile phones. This often leads to cell, add the high-frequency complaining of many user ears.

This device has the influence on the use of cell phone is dramatic. During the movie, constant interruption, weddings, funerals, game in the library, and other functions in church declined unbelievable. Scientists say that teenagers into their private telephone interrupt ceaselessly in every babbling could lead to concern with long and improve grades in school. The car accident caused a mobile phone distraction has greatly reduced.

Mobile phone manufacturer, has caused the silencer scream. The use of mobile phone sales and they had fallen from our point of view brilliant.

"This is a violation of the right to freedom of expression. What kind of a country, it is if people cannot blindly babble hours, to cry for no reason?" Cacophonous cells Ibrated CEO Carl.

"This device on behalf of the American enterprise destruction." This endless zitterbewegung inventor milos many, overlooking the fact that most of the mobile phone manufacture in China, Taiwan and Finland and the silencer is a 100% of American manufacturing products.

Lawmakers decided it was time seems to infringement, below this kind of circumstance, because they enjoy the freedom and constant ring, with mobile phones blathering the popularity of the explosion.

Further, the invention from cells will soon in the future research achievements, including TV, computer games research, the research achievement and MP3 IPod excessive louder, many americans to invest in the development of the use of a pacemaker disturb dick cheney. Some people are really distortion are developing a vibration warp.

Unfortunately, the silencer decline in the high frequency tones in this region can be triggered the dog, more annoying cells. Another disadvantage is that people use the silencer has the function of ice, and know mobile phones or get "clever" actually those precious people engaged in an important call.

Where Cell Phone Signal Jammer Are Used？

Extensive use of mobile phones are equipped with the widespread use of infringement. Although most of the mobile phone companies have spent millions of dollars with appropriate education to mobile phone users of mobile phone use and etiquette, there are still many people ignore such manners. Also because of this cell phone use signal interference becomes popular.

Although mobile phone signal interference is illegal in some countries, but some places are legitimate. Almost all the prison facilities for global mobile phone calls made prisoner not contact in the disturbance to the outside world. We must remember that these prisoners can still for illegal activities, so need to use mobile phones per penology owns the interference. To a certain extent, hampered the further plan or future crime.

In China, the education department use cell phone signal jammer to prevent cheating student with his mobile phone. They use mobile phone jammers legalised, especially in the exam main end. The perimeter and the high school is a moving around, so that students will not answer the phone even messages can be used as a cheat or illegal purposes. Some university in Iran is using the phone jammers prevent students use their phones in class.

Talking about Cell Phone Jammer Legal Issues

In the United States, United Kingdom, Australia and many other countries, cell phone jammer (as well as any other electronic transmissions) is against the law. In the United States, cell-phone jamming is covered under the Communications Act of 1934, which prohibits people from "willfully or maliciously interfering with the radio communications of any station licensed or authorized" to operate. In fact, the "manufacture, importation, sale or offer for sale, including advertising, of devices designed to block or jam wireless transmissions is prohibited" as well.

Jamming is seen as property theft, because a private company has purchased the rights to the radio spectrum, and jamming the spectrum is akin to stealing the property the company has purchased. It also represents a safety hazard because jamming blocks all calls in the area, not just the annoying ones. Jamming a signal could block the call of a babysitter frantically trying to contact a parent or someone trying to call for an ambulance.

The Federal Communications Commission is charged with enforcing jamming laws. However, the agency has not yet prosecuted anyone for cell-phone jamming. Under the U.S. rules, fines for a first offense ca­n range as high as $11,000 for each violation or imprisonment for up to one year, and the device used may also be seized and forfeited to the government.

In most countries, it is illegal for private citizens to jam cell-phone transmission, but some countries are allowing businesses and government organizations to install jammers in areas where cell-phone use is seen as a public nuisance. In December 2004, France legalized cell-phone jammers in movie theaters, concert halls and other places with performances. France is finalizing technology that will let calls to emergency services go through. India has installed jammers in parliament and some prisons. It has been reported that universities in Italy have adopted the technology to prevent cheating. Students were taking photos of tests with their camera phones and sending them to classmates.

With people talking on cell phones in movies, weddings and classrooms, it's no wonder people want to tone down the intrusion. So what can be done legally to stop annoying cell phone use? That is a question worth thinking over.

Cell Phone Jammer Power Supply & Applications

Power supply
Smaller jammer is battery operated. Some look like cell phone and use cell-phone batteries. Stronger devices can be plugged into a standard outlet or wired into a vehicle's electrical system.
Check your phone - If the battery on your phone is okay, and you'd like to continue your conversation, try walking away from the area. You may be able to get out of the jammer's range with just a few steps.

Cell Phone Jammer Applications
Cell phone jammer devices were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists. The bombs that blew up commuter trains in Spain in March 2004, as well as blasts in Bali in October 2002 and Jakarta in August 2003, all relied on cell phones to trigger explosives. It has been widely reported that a cell phone signal jammer thwarted an assassination attempt on Pakistani President Musharraf in December 2003. When President Bush visited London in November 2004, it was reported that British police considered using jammers to protect the president's motorcade through London.

During a hostage situation, police can control when and where a captor can make a phone call. Police can block phone calls during a drug raid so suspects can't communicate outside the area. Cell-phone jammers can be used in areas where radio transmissions are dangerous, (areas with a potentially explosive atmosphere), such as chemical storage facilities or grain elevators. The TRJ-89 jammer from Antenna System & Supplies Inc. carries its own electrical generator and can block cellular communications in a 5-mile (8-km) radius.

Corporations use jammers to stop corporate espionage by blocking voice transmissions and photo transmissions from camera phones. On the more questionable end of the legitimacy spectrum, there are rumors that hotel chains install jammers to block guests' cell-phone usage and force them to use in-room phones at high rates.

How much of Cell Phone Jammer do You Know about?

Brief of cell phone jammer

Jamming devices overpower the cell phone, which is called cell phone jammer by transmitting a signal on the same frequency and at a high enough power that the two signals collide and cancel each other out. Cell phones are designed to add power if they experience low-level interference, so the jammer must recognize and match the power increase from the phone.

Cell phones are full-duplex devices, which means they use two separate frequencies, one for talking and one for listening simultaneously. Some jammers block only one of the frequencies used by cell phones, which has the effect of blocking both. The phone is tricked into thinking there is no service because it can receive only one of the frequencies.

Less complex devices block only one group of frequencies, while sophisticated jammers can block several types of networks at once to head off dual-mode or tri-mode phones that automatically switch among different network types to find an open signal. Some of the high-end devices block all frequencies at once, and others can be tuned to specific frequencies.

The main electronic components of a jammer:

1. Voltage-controlled oscillator - Generates the radio signal that will interfere with the cell phone signal
2. Tuning circuit - Controls the frequency at which the jammer broadcasts its signal by sending a particular voltage to the oscillator
3. Noise generator - Produces random electronic output in a specified frequency range to jam the cell-phone network signal (part of the tuning circuit)
4. RF amplification (gain stage) - Boosts the power of the radio frequency output to high enough levels to jam a signal.

Digital Home

20th century is one of the greatest inventions in the computer as a representative of the digital technology. The advent of the computer has vigorously promoted social progress and development, and its core is the great progress in information era. The development of computer technology not only visible in scientific computing and military application fields, in family life, computer application, home theater, rapid and intelligent electrical appliances, family, children education office, financial management, etc., all these make people feel clear digital features. Digital and further more media-oriented new technology in our life, profound influence.
In the future will be "intelligent electrical equipment, most of the interconnect together, and by one or several central computer control, this is concentrated in the family of electronic central. This means that can be automatically according to air temperature automatically adjust indoor temperature, according to the ground cleaner to clean the room clean, even degree of master of distant home appliances can switch. These though not strictly multimedia, but it is still a multimedia revolution brings direct technical achievements. The multimedia computer will gradually into the fabric of our life, it will be more human, more of our life, even in the future life of existing change our party, digital life may become the main mode of life in the future, people without a computer, computer will become more colorful. Family automation and security to high integration and comprehensive development of digital home in digital video network system, in addition, trendy, audio-visual electronic and home automation and safety equipment also plays an important role. So-called home automation, refers to the use of electronic technology to control the integrated or home electronics products or systems (e.g. floodlight, coffee, computer equipment, security system, heating and air-conditioning systems, video and audio systems, etc.). Its main functions through a central management platform to receive from the outside environment induction sensor (, such as sunsets and sunrises caused by changes in the light of the information, etc.) with established procedure control other electronic products. In addition to through various interface (keyboard, touch screen, button, a computer, a telephone, remote control, etc.) to control the home appliances, building owners can also send control signal to the central processing equipment and the central processing equipment from the information.

History of Alarm System

In 1874, L.H. McCollough invented the first mercantile alarm system. The first alarms systems utilized a single zone of protection that extended around the perimeter of the facility. The zone was nothing more than an electrical circuit that allowed current to constantly flow from one end to the other. When a door was opened, or a window was broken, the flow of electricity would be interrupted and the panel would cause an alarm. The panels would utilize a McCollough transmitter to send a type of code to the local police or monitoring facility. The McCollough transmitter was a wind-up device that was connected to a dedicated copper circuit. When the alarm was triggered, the McCollough transmitter would unwind and send a series of pulses along the dedicated copper wire.

The signal is best compared to a type of Morse Code or Telegraph Signal. After the alarm went off, the McCollough transmitter would need to be re-wound so that it was ready to send the next alarm.

The McCollough Receiver would tap out holes in stripes of paper. An alarm dispatcher would compare the holes with a list to pinpoint where the alarm had occurred. The earliest McCollough transmitters were utilized for fire alarm pull stations.

Needless to say, this forever changed the way that alarms were responded too. Fire Brigades could now respond much faster to the scene of a fire.

Alarm panels have come a long way since the days of the McCollough transmitter, but as a testament to the technology invented by McCollough, some of the most secure alarm transmission methods available today utilize a very similar technology.

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Hello, buddy. Welcome to my blog. This blog is created to introduce and discuss security and surveillance products. Provide anyone who are interested in security and surveillance products with infomation relates to security and surveillance products. Hope you can find what you need. Good luck and best wishes!