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Planning the IZs
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When you are performing a site analysis, you are also trying to determine where to place IZs, interrogators, printers, and antennas You must also consider the flow of the goods; the antennas must be positioned near the goods to be tracked, yet out of harm s way Knowing that when you are reading tags on assets, products, or people as they go through the zone, you want the antennas facing the zone, facing those products, facing those people, but still out of harm s way as much as possible If the facility has a large dock door, vehicles may carry tall pallets stacks, and a tall IZ with perhaps additional antennas will be required to cover the entire space If slow-moving objects are being tracked, you could limit the number of antennas used, especially if you know that the tags are always going to be on one side, and the pallets always move the same way through the IZ (on a pallet conveyor, for example) For low-speed applications, only a couple of antennas may be required to get the job done as opposed to high-speed applications that need multiple antennas along the travel path to increase tag dwell time
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RF Characteristics
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onducting an RF site analysis in the facility may be required depending on the overall scope of the implementation If you are implementing a simple slap and ship operation, you will not usually need to perform an RF site survey However, if you are performing a multi-dock door and conveyor integration, an analysis of the environment from the RF perspective may save time and money because you will understand potential for interference The analysis will also help you devise a strategy on how to avoid or overcome this interference If you are not experienced in performing RF site surveys, you should hire a specialized company to conduct the analysis, such as a local wireless network company You do not need to survey the whole facility; you may target just the areas of IZs and potential interference In a full-blown implementation, sources of interference need to be identified with a spectrum analyzer, which will measure across a broad frequency range looking for what RF activities are already present at the site Typically, you should examine a relatively wide band around the frequency you will be using
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CHAPTER 9 Site Analysis
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for your system If, for example, you are performing a site survey specific to 915 MHz, you will set your spectrum analyzer from 400 MHz to 15 GHz to measure all RF activity in the range You should also look for harmonic signals, which can cause problems with your system In a European installation with a 433 MHz active tag RTLS and a passive system running between 865 and 868 MHz, for example, you should be aware that these signals could cause problems 866 MHz is exactly double the 433 MHz value and is therefore the first-order harmonic, which could cause interference Knowing this can save you a lot of headaches should problems arise in the future
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Harmonics Harmonics occur when two wavelengths intersect If one wavelength is exactly double the length of another, they can intersect and cause a null within the read zone
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How to Use a Spectrum Analyzer
Once a potential frequency interferer has been identified on the spectrum analyzer, it s pretty simple to identify the source of that frequency Move 10 feet in any direction and note whether the signal gets stronger or weaker If it gets stronger, continue to move in that same direction until the signal is at its strongest; then look in the immediate proximity for the source of that interference
Dealing with Interference
If you find a potential source of interference, you will have to find a way to shield against it or you may have to replace it If the problem is caused by two-way radios, for example, the solution may be easy: replace them with communication devices operating in a different frequency range On the other hand, if the interference is caused by a manufacturing execution system, such as a crane and that can cost a couple million dollars, replacement may not be an option For situations in which you cannot avoid interference for other reasons, you can consider shielding Some sources of interference can be conveyor belts, large motors running at 480 volts, electric motors on forklifts, electric power jacks, any kind of heavy machinery, and air-conditioning units All of these devices can cause substantial interference to your low frequency (LF) and high frequency (HF) systems Other objects may prove to be unexpected sources of interference In one particular
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