Diameter as much as possible to do a small (big 1.0mm than the diameter of the screw cap can be) about the two screw holes stopper external surface is not the same, not interchangeable, you must do in the cylindrical surface of the screw hole rubber stopper foolproof concave slot to be distinguished. made eccentric screw hole rubber stopper according to the needs of the structure and different screw axis, as long as we can cover the screw cap because the whole dismantling must be used screws, so in order to verify that the phone has not been secretly apart However, some manufacturers within the battery cover screw holes on top of digging a platform out affixed to an easy shredding, if you want to loosen the screw of the screw hole, it must be destroyed easily shredding Post a platform for easy shredding must be designed according to the size of the easy shredding.cell phone jammer can not act on the 3G signal effectively.
Platform shape is slightly larger than the easy shredding, lower position than the shell down one, to prevent finger accidentally touched the easy shredding of the fixed structure of the speaker phone’s volume is a strong selling point, this speaker sound chamber for more high demand. In addition to the requirements of the program the speaker itself out of the pitch to the best speakers sound chamber structure needs to pay attention to the following: the first sound chamber of the speaker must be done to close the speaker and the shell directly with between the speaker and the shell must be affixed to the foam ring closed, the speaker side shell long ring circumference bone surrounded unilateral clearance to stay 0.1mm antenna bracket separated between the speaker and the shell, then between the speaker and the antenna bracket must be affixed to the annular foam closed between the antenna bracket shell must also be affixed to the annular foam closed. Normally, the common 3G cell phone jammer is the four frequency band jammer.
In short, the sound of the speakers through the sound hole on the shell to spread out the front speakers sound chamber height should be greater than 1.5mm. Speakers sound cavity height is the vertical distance refers to the front of the speaker to the housing wall, in order to ensure adequate speaker height of the sound chamber, the inside of the shell the sound chamber can even glue thick dig as thin as 0.6mm. the sound hole area necessary to achieve 15% of the speakers the sound, the sound hole area is the total area of the sound hole . speaker, the sound area of the speaker positive to remove the middle part of the area after the foam, the speaker sound chamber height is higher, requiring a sound hole area accounted for the greater the proportion of the speakers the sound area, when the speaker sound chamber height above 20, the sound hole area and the speakers sound area that is 100%. cell phone jammer integrates three kinds of 3G frequency bands in one or two bands.
1.5 ~~ 4mm sound chamber with most phones speaker, the sound hole area accounted speaker sound area of 15% to 20%, better sound effects. Out the structure of the sound hole is the most simple approach is directly in the shell openings on the body, can be a hole array can also be a hole of a head of strip in order to prevent dust and foreign matter into the sound chamber, dust network can be affixed inside the enclosure, the beautiful, the sound hole. side can be affixed to the nickel plate, PC tablets, and other decorative pieces, nickel plate, mesh diameter can be small to 0.3mm in the case of the use of nickel plate, inside the enclosure can not affixed to the dust network. speaker after tune impact low-frequency part of the ring tones, the high frequency part is smaller, you can not do the requirements. It will make the signal coverage band width of cell phone jammer within one band too wide.