MIKE MEYERS COMPTIA RFID+ CERTIFICATION PASSPORT in Software

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MIKE MEYERS COMPTIA RFID+ CERTIFICATION PASSPORT
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facility, for example, forklift operators honked their horns when they approached an intersection When an operator honked the horn, it created a harmonic exactly in the 915 MHz band, causing interference with the UHF RFID system The solution in this case was to prohibit use of horns in that immediate area or replace the horns with others that generated higher or lower tones
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Don t forget about harmonics created by active 433 MHz systems, which can interfere with UHF systems in Europe, which operate at 865 to 868 MHz
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When you are performing a site survey, ask the IT staff questions regarding any devices that could possibly cause interference: What types of two-way communication devices are employed here What types of pagers are used If a particular carrier is used for these devices, get the carrier name and a phone number to find out more information about the system if needed Many types of sudden interference are caused by faulty devices that should be fixed or replaced Other sources of interference can be the following:
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Wireless network (usually operating at 245 GHz) Short-range radios Cordless phones (operating at 915 MHz or 245 GHz) Microwave ovens LAN equipment Neon lights Public or personnel address systems
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Here s a story from a real-world implementation that may inspire you when solving hard-to-identify interference In a 915 MHz installation, it was difficult to identify an interfering device, because the signal would often disappear and appear independently on running equipment After a while, an engineer using a spectrum analyzer measured a large spike in a signal when someone was being paged through the internal speaker system This led to the discovery of the problem: a speaker with a malfunctioning coil created signals in a frequency that caused a direct interference with the installed RFID system
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CHAPTER 9 Site Analysis
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If you run into a problem during installation or troubleshooting, it may be necessary to generate a path loss or RF path loss contour analysis (PLC analysis) You ll know that it may be beneficial to perform the RF PLC analysis, for example, when you have installed some equipment, and all the indicators say it works fine but you notice sporadic sources of interference that you cannot identify or spots where the tags are not read The PLC analysis measures RF signals all the way around your active IZ and provides information about the signal strength in granular detail You ll need to do the following to perform this type of analysis: 1 Grab a spectrum analyzer and a measuring tape 2 Measure signals in 1-foot increments from the antenna in all dimensions (straight, right, left, up, and down) 3 Mark the signal presence and, ideally, its strength in all points 4 You can then generate a map and color code the areas according to signal strength You can do this manually or using specialized software After you are done with the PLC analysis, you can determine how your signal propagates and identify where issues in the IZ exist, and you will also discover the sources of interference that you did not expect Typically, PLC analysis is very expensive, as it is a time and labor-intensive process; however, it may pay off if your system is not performing as it should and you cannot determine the cause An example of an RF PLC is shown here:
MIKE MEYERS COMPTIA RFID+ CERTIFICATION PASSPORT
Difference Between Wi-Fi and RFID Site Analysis
RFID site assessments are not that different from wireless network implementation site surveys However, Wi-Fi tries to achieve a result quite different from that of the RFID implementation The goal of Wi-Fi implementation is to flood the entire facility with RF, while the goal of RFID is to flood only a particular area with a high likelihood of reading tags as they traverse that area (IZ) and control/contain the RF signals within this zone
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