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Wireless Knowledge Center > Wireless System Setup Drawings |
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Sample System Setup Drawings |
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Cellular Amplifiers, High Gain Antennas & Cellular 3G Routers |
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Lighting surge suppression devices critical if mounting antenna in roof. Appropriate lightning device properly grounded in accordance with NEC or other applicable local regulations STRONGLY recommended more on lightning devices |
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Careful installation required to prevent oscillations caused by co-channel interference between outdoor antenna and indoor antenna. Observer minimum separation distances. Too much gain just as bad as too little. If gain too strong consider using attenuators to lower the gain. |
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Amplifier re-radiates boosted signal up to a maximum area. Consider carefully distance between cellular device and internal dome antenna. |
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Carefully consider total link budget (i.e how much signal strength you need vs how much is lost in cables/connectors) from outside antenna to mobile device. |
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Need information on what frequency band your carrier is operating on in your geographic area if getting single band amplifiers. |
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Not all amplifiers or cellular routers are created equal!!! |
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Mobile Cellular Amplifiers. Mobile 3G/ 4G Routers & Antennas |
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Need an amplifier that is capable of handling mobility (wireless data communications systems degraded by a phenomenon called doppler frequency spread in a moving vehicle). |
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Need an omnidirectional antenna since direction of maximum received signal strength varies depending on where vehicle is more on cellular antennas |
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Typically powered by a DC/DC converter from the car battery. |
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Wireless systems components should be capable of handing temperature gradients and vibration dynamics of a moving vehicle. |
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Medium Range Wireless Bridging Solutions |
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These applications pertain to situations where you need to extend your WLAN or Internet access outside the range of 802.11b/g/n radios i.e greater than ~500ft (150m) to about 3500ft (~1km) and at high datarate ~10mbps or more. See below for long range links > 1mile. |
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802.11n radios on the right channel will easily give you in excess of 300FT of coverage. Before spending money on costly bridges investigate whether you could boost the performance of your existing system (you often can using directional antennas, amplifiers, power-line adapters etc.) Learn More |
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Lighting surge suppression devices critical if mounting antenna in roof. Appropriate lightning device properly grounded in accordance with NEC or other applicable local regulations STRONGLY recommended more on lightning devices |
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Do be a good neighbor and observe FCC EIRP (Effective Isotropic Radiated Power). Where possible utilize high directivity antennas to reduce chances of interfering with other neighboring unlicensed band devices. |
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Long Range Wireless Bridging Solutions |
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By long range we mean > 1mile to several miles. Depending on desired data-rate, available frequency band and available line-of-sight, 50+ miles possible with tens of mbps and decent fade margin. Setting up a long-range wireless link is not a trivial exercise especially if using an unlicensed frequency band and trying to push throughput. |
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RF line-of-sight (LOS) is not the same as optical line-of-sight. You could have an optical line-of-sight and still not have RF LOS if there are obstructions in the Fresnel Zone (and Fresnel zone depends on wavelenght/frequency of signal). Non-line-of-sight (NLOS) and near-line-of-sight (nLOS) links possible but at reduced datarate Learn More |
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Typically the higher the frequency band the more the available bandwidth hence the higher the possible datarate (simplest form is bound by shannon channel capacity proportional to the Bandwidth and log of SNR). So millimeter wave (MMW) at 60GHz allows for better datarate than 5.8GHz or 900MHz but since the beamwidth is much smaller it requires more careful alignment and since wavelength is much lower more susceptible to rain fade. |
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Often the Capex required to implement long-range links is outweighed by 3G/ 4G WWAN links even after considering monthly subscription costs. The latter further provides for almost seamless migration to newer faster protocols. |
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Contact us for your custom system design. |
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Wireless Video Surveillance Applications |
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It's important to be realistic with your expectations. You should not expect to stream high quality video in real-time on a high latency 1xRTT or EDGE network! Learn More |
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All new projects should utilize IP cameras. Where possible legacy analog cameras should be replaced or encoded to IP. |
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With wireless video surveillance it takes more than just high speed backhaul. Jitter and latency can kill the project. |
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Wireless Telemetry, Automation & Control |
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Most popular wireless thermostat, the Totaline/ Venstar system is too simple to install to deserve any technical drawings. Refer to product page for technical specs More |
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For most residential/ commercial wireless HVAC needs the Totaline/ Vestar or Honeywell RedLINK™ products typicall suffice Learn More |
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As with most other data systems, when trying to remotely monitor environmental conditions such as temperature, humidity, CO2, CO for data logging or as part of a SCADA system, the goal is usually to convert it to IP as early as possible (prefereably at the sensor node) and use TCP/IP transport to remote storage server or monitoring stations. Rfwel's expertise in wireless data transport allows the economical bridging of distant sensors More on DAQ's |
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Radio Over IP [Over Wireless] & Radio Interoperability |
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ACU-100M Interoperability System allows cross connection of different communciation systems: HF, VHF, UHF, Trunked Systems, Cellular PTT, Cellular Voice, PSTN, Sattelite Systems Learn More |
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The NXU-2A Network Extension Unit allows distribution of Radio Cicuits over IP LAN/WAN Learn More |
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Rfwel then uses our expertise on Wireless distribution systems both local/campus and long range to interconnect different radio transceivers Learn More |
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