Portable GPS Jammers are electronic devices that jam the broadcast of an antenna by preventing it from reaching a specific area. These devices work on the principle of creating a shadow effect by diverting the electromagnetic radiation of an antenna and instead allowing it to be absorbed by a receiver, or in the case of a modular design, a transmitting device. The principle of operation is similar to that of a radar gun in that an antenna is intentionally jolted so that the transmission of a signal can be interrupted. Modern portable jamming devices are often miniature versions of long-established jamming devices. Modular designs allow for portability while keeping the character of the original device.
The most common portable signal jammers are n-jam 140 jamming systems. This is a device manufactured by Q-TI that is used by many law enforcement agencies to prevent radio frequencies from being diverted by criminals or others who may use the frequency spectrum for malicious purposes. Although law enforcement agencies use n-jam products frequently, this is a rather popular product for civilian users. These types of devices can be used to block cell phone communications as well as unlicensed radio frequencies.
One of the best-known manufacturers of n-jam products is Golden Frog. The company has been manufacturing and distributing this type of jamming system for quite a few years. They have several different models available, including handheld jammer applications as well as a modular design that allows it to be placed in any vehicle without any modifications required. Modular jamming systems from Golden Frog allow for easy installation and have gained popularity among security agencies and other local government entities that want to block certain frequencies. The company's range of products also includes a range of dedicated security devices that are designed to interfere with satellites, mobile phones, faxes, and other communication systems.
Another manufacturer of portable signal jammers is Seecom. Their product line also offers a modular design, and they have a range of different products, which all have the same basic features. They offer both, single and multiple antennas, and there is a dedicated model called SBS-jammer, which can operate even when a power outage occurs.
Onsite Alarm is another manufacturer of sb-jammer-type products. They offer a range of different models, which include portable and stationary versions. They also have a dedicated sb-jammer model which can prevent disturbances caused by mobile communications devices' jamming system. This model can prevent the interference of a specific frequency band by employing an active phase shift. In addition to protecting certain frequency bands, this sb-jammer can protect various communications devices by preventing interference. Click here for more valuable info on portable signal jammers.
There are many other manufacturers of this type of targeted jamming device. The most popular brands are named above, but there are many more that can be purchased on the internet or at a local electronics retailer. The types of frequency bands they can jam are commonly referred to as C-Band, PCD-Band, FRS (family radio service), CDMA (Cellular Digital Subscriber Identity), and some other commonly used types of radio service bands. To get more enlightened on the topic, check out this related post: https://en.wikipedia.org/wiki/Radio_jamming.