Ensuring Fairness and Integrity in Various Types of Examinations
In order to maintain exam discipline and fairness, the majority of exam rooms are equipped with signal jammers. These devices are not only limited to common exams such as the middle school entrance exam, college entrance exam, English proficiency tests, and adult education exams, but are also used in judicial exams and professional skill assessments. Consequently, there is a significant demand for signal jammers every year. With the advancement of mobile phone technology from 2G to 5G over the past 20 years, signal jammers also require periodic updates. When selecting and purchasing signal jammers, exam authorities primarily focus on three key factors: functionality, reasonable pricing, and the impact of low prices on quality and longevity.
Exam Room Signal Jammers: Ensuring Fairness and Integrity
To ensure fairness and integrity in various types of exams, the majority of exam rooms are equipped with signal jammers. These devices are essential not only for common exams like the middle school entrance exam, college entrance exam, English proficiency tests, and adult education exams, but also for judicial exams and professional skill assessments. As a result, there is a significant demand for signal jammers every year. Additionally, with the evolution of mobile phone technology from 2G to 5G, signal jammers need to be updated periodically.
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Key Considerations in Signal Jammer Selection and Procurement
When exam authorities select and purchase signal jammers, their main concerns revolve around three key factors. Firstly, they assess whether the signal jammers meet the requirements for blocking various types of signals. Secondly, they evaluate the pricing of signal jammers, as bulk purchases are common and excessive pricing is undesirable. Lastly, they consider whether low-priced signal jammers may compromise the quality and lifespan of the devices. In essence, the second and third concerns are centered around the pricing of signal jammers.
The Cost Composition of Signal Jammers
The cost of a signal jammer primarily includes the equipment casing, power supply, antennas, RF signal sources, power amplifiers, and power circuit boards. To minimize the cost of signal jammers, there is limited room for cost reduction in the casing, power supply, and power circuit boards. The differences in investment costs among signal jammer manufacturers are not significant. However, the major price differences lie in the antennas, RF signal sources, and power amplifiers. By using non-standard RF antennas, such as a segment of coiled copper wire, instead of standard RF antennas, the number of antennas required for a signal jammer can be reduced to 10-12, resulting in a significant decrease in price.
Reducing Costs through Component Selection
In terms of RF signal sources and power amplifiers, cost reduction can be achieved by sourcing second-hand components from the market or salvaging components from discarded mobile phones. By adopting these methods, the cost of this component can be reduced by at least two-thirds.
Signal jammers play a crucial role in maintaining exam discipline and fairness. The demand for these devices is substantial, encompassing various types of exams. When selecting and purchasing signal jammers, exam authorities prioritize functionality, reasonable pricing, and the potential impact of low prices on device quality and longevity. By carefully considering the cost composition and exploring cost-saving measures in antenna selection and component sourcing, the overall cost of signal jammers can be effectively controlled.