Cell Phone Jammers has the after-service of one-year repair

Cell Phone Jammers has the after-service of one-year repair.
IC mixer circuit mixing circuit applications in the cell phone the most, in the early cell phones, and some mixers use a single integrated component, now cell phones in the mixer are integrated in a complex multi-RF processing or IF processing module. Have to use the phone's receiver IF amplifier. IF amplifier is the most important role is: to obtain high gain: compared with the RF amplifier part, due to a fixed IF frequency and low frequency, can easily get a higher gain, which can be large enough for the next level to provide input . Improve the selectivity: the receiver frequency selectivity is generally close to the IF amplifier passband by the width of the decision. The antenna direction can influence shielding range of  Cell Phone Jammers .
For the IF amplifier, not only need high gain, good selectivity, but also have enough good pass-band and frequency response, large dynamic range. The receiver adjacent channel selectivity is generally from the IF amplifier pass band width of the decision, the IF signal into a single fixed frequency, the passband can be done to maximize the small, to improve the adjacent channel selectivity. In practice, the general multi-stage amplifier, and to achieve a certain technical requirements for each level. Whether using one or two frequency receiver technology, IF amplifier frequency is always ranked in the following. In order to avoid mirror-frequency interference, improve the image frequency selective, receiver usually the first local oscillation frequency is reduced to improve the first IF frequency and multiple frequency method, the signal from the radio frequency spectrum and gradually move to a lower frequency.  Cell Phone Jammers  designs the shielding signal starting device controlled by the computer for these characteristics.
Phone circuits are mostly used in all on their own dedicated chip. IF amplifier circuit component separation of form and the form of low-noise amplifier circuit is very similar, but also a common emitter circuit, but their work is not the same frequency. Most cell phones in the current circuit, Motorola cell phones are usually used in the IF amplifier IF amplifier discrete components, and other cell phones in the IF amplifier is usually an integrated circuit. As Figure 4-11 Motorola P7689 phone IF amplifier circuit. IF amplifier circuit in the form and the form of low-noise amplifier circuit is almost the same, but they cover different frequency work. Low-noise amplifier is a broadband amplifier, and the IF amplifier is a narrow band amplifier. The first characteristic of  Cell Phone Jammers  is the good shielding effect.
In SendMessengTestSuit in writing to send a short message function in the 10 test cases; in RecieveMessengeTestSuit in writing to accept a short message function in the 15 test cases. The first step, start Visual Studio5, open the "File" menu in the "New" menu item; the second step, in the "New Project" window, select "Smart Device-> Windows Cell phone 6 Professional" as the project type; and select " Class Library "as the" Visual Studio installed templates "; the third step," Name "text box, enter" PocketPC ";" Location "text box, enter the address stored in automated testing. The director will perform the incoming test of Cell Phone Jammers .