Where are signal blocking devices available in the market?
Signal blocking devices, commonly known as jammers or signal jammers, are designed to interfere with wireless signals. Depending on the region, they have various names such as signal countermeasure devices, signal containment control systems, signal suppressors, signal blockers, signal jammers, signal separators, etc. These devices are divided into different categories according to their functions or uses, including RF signal jammers, cell phone jammers, GPS signal jammers, wifi signal jammers, UHF/VHF explosion-proof jammers, recording jammers, test room jammers, car jammers, etc.
Main specifications:
Product model: JW-N8G 8-way handheld signal jammer
Product color: military green
Signal coverage: full-band mobile phone signal 4G/3G/2G+WiFi 2.4G/5.8G or GPS/Beidou navigation
Transmitting power: 0.7W per segment, total output power 5.6W (excluding antenna gain)
Coverage distance: 2-20 meters (may vary depending on signal strength and environmental factors)
Coverage angle: horizontal 360º (recommended installation height of about 2 meters)
Indication function: charging and discharging, LED lights indicate the working status of each channel
Battery life: built-in large-capacity lithium battery, can work continuously for 1.5 hours, standby for 180 days, and fully charged in about 4 hours
Product size: 163x85x47 mm (excluding antenna length)
Equipment weight: about 0.5kg
Usage environment: -40℃ to 60℃
Packaging details: Main jammer x1, omnidirectional antenna x8, charger x1, DC12V car charger cable x1, nylon protective cover x1
How to test the local signal strength before purchasing a mobile phone signal jammer?
The effectiveness of the signal jammer depends on the signal strength of the use environment. The coverage distance indicated by the manufacturer is generally based on the signal strength of -75dBm. Therefore, when purchasing a suitable jammer, be sure to evaluate the local signal strength, otherwise there may be no effect or the effect may be unsatisfactory. The signal strength displayed on the mobile phone is represented by a stepped signal icon, corresponding to the “dBm” value. dBm stands for decibel milliwatts and is a commonly used signal strength unit for mobile phones. Due to the logarithmic nature of dBm, the displayed value is negative.
Generally, the mobile phone displays a dBm value between -80 and -50, the signal is good, and calls and Internet access are normal. If it is lower than -90dBm, it means that the signal is weak and disconnection may occur. If it reaches -100dBm, it is recommended to switch to flight mode or sleep at night to reduce power consumption and radiation. Most Android phones support checking signal strength. The method is: [Settings] – [About Phone] – [Status] – SIM Card Information. For iPhone, we take iPhone XS as an example. Enter the code “3001#12345#” in the dialing interface, click the dial button, open the “Service Cell Measurement” interface, and you can view the signal strength values ​​of the main card “rsrp0” and the secondary card “rsrp1”.
