The GPS jammer market has been in short supply

If permitted, the school will jam cell phone frequencies during class time but not between classes or during lunch. "We believe that there are times during the school day that parents need to have access to students and students need to have access to family members, and doctors and things like that," said Hook.Canada had considered allowing blocking in similar situations. But Industry Canada, which regulates the country's telecommunications, decided against it, saying the devices could infringe on personal freedom and affect public safety by crippling communication with law enforcement and security agencies.
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An even more effective and now proven EW solution is The Marine Corps’ Marine Air Defense Integrated System (MADIS). Based on Sierra Nevada Corporation’s battle-tested counter-IED technologies, MADIS uses a combination of radar and electro-optical sensors to detect, track and target drones and then fires a powerful electronic jammer to defeat the drone’s flight controls. There are several variants of MADIS either fielded or in development, including a fixed version for bases, a standard system mounted on the Joint Light Tactical Vehicle and even a light MADIS that can be carried on an all-terrain vehicle.
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The core of SPEAR-EW’s payload is Leonardo’s advanced, miniaturized Digital Radio Frequency Memory (DRFM) technology, which offers the most advanced and future-proof electronic jamming and deception available on the market today.Powered by a turbojet engine the SPEAR missile offers over double the range, and a far more flexible operating envelope, when compared to a conventional glide weapon. SPEAR-EW utilizes this long endurance through its capacity to be launched at enhanced stand-off ranges and loiter while carrying out its jamming mission.
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