The antenna of cell phone jammer can be the omnidirectional whip one

 The antenna of cell phone jammer can be the omnidirectional whip one. Theatre of the installation should be noted that the general shielding devices installed in the 1.8-3.0 m height, in the conditions permit, as far as the construction of the theater interior noise in the pre-installed points of cotton or decorative plate left active port for easy future installation of mobile phone jammers and maintenance. Left at each forecast point 220V power supply. 2.4.2 Should the shielding device with directional antenna shielded area for theater or venue strict distinction needs to be done (such as retention signals the podium, the audience all the shield), but can not for the external impact of the request, it would take all the shielding the antenna of mobile phone switched into directional antenna, but also the selection of possible transmission power of each channel can be smoothly adjusted jammers.Different cell phone jammer has different technical parameter. 2.2.4 Hybrid ground with a single point ground and the characteristics of multi-point grounding, the device low-frequency part of the nearby single-point grounding, high-frequency part of the multi-point grounding. Measures to reduce ground disturbance 2.3 2.3.1 transformer coupling transformer can transmit communication signals can not transmit DC signals. Therefore, the low-frequency interference on the ground with a good rejection and transmission of signals between the circuit elements only in the current flowing through the transformer winding, no flow through the ground, but also to avoid interference to other circuits, as shown in Figure 4 . 2.3.2 to use with coaxial cable coaxial cable signal transmission signal can effectively inhibit the ground loop interference. 2.3.3 optocoupler optocoupler circuit between the two ground-loop completely cut off, to more effectively inhibit the ground disturbance. The company has begun developing other type of cell phone jammer. 3 is shielded shielded electronic systems and electronic equipment to improve the electromagnetic compatibility of the important measures that can effectively inhibit the spread of various disturbances through space, can prevent or reduce the electromagnetic radiation of electronic devices can be internal and external transport, but also prevent or reduce the external electromagnetic radiation can affect electronic equipment. Shielded by the mechanism can be divided into: field shielding, magnetic shielding and electromagnetic shielding.The preheat time is needed for cell phone jammer using
3.1 field shielding electronic equipment involved in the electric field is generally alternating electric field, so that the potential can be different between the two units as the electric field induced coupling between the distributed capacitance, shown in Figure 5. Figure A potential source of interference for the UA, by the sense of material B, the induced voltage to UB. UB = C1 / (C1 + C2) UA where: C1 - A, B between the distributed capacitance (pF / m) C2 - a sense of things by the distribution of B-to-ground capacitance (pF / m) known by the above equation for the reduced small electric field sensor, may take the following measures: - increase the interference source A and B by a sense of distance between objects in order to reduce the distributed capacitance C1; - B will be subject to a sense of things as close to the ground (ie, floor, ground) installation, in order to increase CA; - inserted between the A and B metal shield, is to reduce the C1.The company has manufactured a series of cell phone jammer.