free barcode reader sdk c# Basics of Microwave Communications in Software

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The 24-GHz ISM band used to be called the junk band, because it was already contaminated by oven emissions Years ago, 243 GHz was allocated to the microwave oven, and it was felt that no one would ever want to co-occupy this band As pressure to allocate more spectrum to communications was felt, the FCC set up rules for license-exempt ISM operation in this band Commercial spread-spectrum systems typically use the ISM bands worldwide These are located as shown below:
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902 to 928 MHz 2,400 to 2,4835 MHz (microwave ovens are located here) 5,725 to 5,850 MHz
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Commercial spread-spectrum systems in Canada are similar and are based on Industry Canada, Spectrum Management, RSS-210, Low * Power License-Exempt Radio-communication Devices Licensed microwave systems in Canada using the same band are described in RSS139, Licensed operation from 2,400 to 2,4835 MHz In part for reasons of safety, the transmitter power output level in the ISM band is limited to 1 W (+30 dBm) maximum input antenna power For similar reasons, and to minimize interference, effective isotropic radiated power (EIRP), or power radiated by the associated antenna system, is limited to 4 W (+36 dBm) maximum in Canada In the US (24 GHz band), for every 3 dB of antenna gain over +6 dBi, the input power to the antenna is reduced by 1 dB from +30 dBm In the 58 GHz band, there are no EIRP limits only a +30 dBm maximum antenna input power The 5 GHz band is divided into several sections referred to as the Unlicensed National Information Infrastructure (UNII) bands (see Table 25) The UNII-1 band is designated for indoor operations and, therefore, not of interest for point-to-point microwave networks The UNII-2 and UNII-3 bands are for indoor and outdoor operations, and the 5725 5825 GHz UNII/ISM band (called this because of overlap with the ISM band) is intended for outdoor bridge products and may be used for indoor WLANs as well The expansion of the 80211a wireless market and the constant push to open up new spectrum for license-exempt equipment use created a requirement for Dynamic Frequency Selection (DFS), a mechanism to allow license-exempt devices to share spectrum with existing military radar and weather radar systems
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More information about Industry Canada can be found on its Web page: http://wwwicgc ca/eic/site/ic1nsf/eng/home
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Two Unlicensed National Information Infrastructure Bands Frequency Number of Range (MHz) Channels Max Power Max EIRP 5,150 5,250 5,250 5,350 4 4 11 4 50 mW 250 mW 250 mW 1 Watt 200 mW (23 dBm) 1W (30 dBm) 1W (30 dBm) 200 W (52 dBm)
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TABLE 25
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Band UNII-1 (indoor) UNII-2 (indoor/outdoor)
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UNII-3 (worldwide, indoor/ 5,470 5,725 outdoor) UNII/ISM (indoor/outdoor) 5,725 5,825
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A new FCC Rule addressing Dynamic Frequency Selection (DFS2) in the 5 GHz UNII-2 and UNII-3 bands went into effect for the US and Canada on July 20, 2007 The regulatory requirements for DFS, along with requirements for Transmit Power Control (TPC) and uniform channel loading have been adopted in the US, Europe, Australia, and Japan and are being considered by many other regulatory domains looking at adopting the 5 GHz bands for license-exempt and possibly licensed devices At power-up and throughout operation, each point-to-point terminal scans the band hundreds of times per second and automatically switches to the clearest channel Some radios will have the 30-day, timestamped database to alert network operators to any interference that does exist and provides statistics that help pinpoint which channels offer the clearest data paths U-NII is an FCC regulatory domain for 5 GHz wireless devices and power limits are defined by the United States CFR Title 47 (Telecommunication), Part 15 Radio Frequency Devices, Subpart E Unlicensed National Information Infrastructure Devices, Paragraph 15407 General technical requirements IEEE 80211a and the European HiperLAN standard operate in the U-NII band Regulations in the license-exempt bands keep changing, so it is recommended you check for the latest update Regulatory use in individual countries may differ It is important to remember that some licensed users sometimes operate in the license-exempt bands as well The license-exempt bands are allocated on a shared basis, and, while there may be no requirement to obtain a license to operate for low-power datacom applications with approved equipment, other licensed users may be allowed to operate with significantly higher power A particularly important example of this is the operation of US government radar equipment in the US U NII band at 5725 to 5825 GHz
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