Remote Wireless Infrastructure

Indoor Coverage

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Improve in-building coverage for cellular 4G LTE, 5G NR, and Wi-Fi data networks.

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Vehicle Data

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Improve cellular coverage in Cars, RVs, Boats, and Service Vehicles..

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Wireless Access

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Solutions for broadband wireless access including point-to-point and point-to-multipoint links.

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Infrastructure

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In-building/outdoor wireless infrastructure solutions for wireless monitoring and control.

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Wireless Video

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Wireless video backhaul transmission applications. Includes complete system design examples.

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Interoperability

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In-building emergency communication systems and interoperability solutions.

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Rfwel Engineering is an Arizona Registered Engineering firm Reg#17227 and a Licensed Low Voltage Communication Contractors [Commercial]: ROC#322820 specializing in helping clients in various industries design, install, and maintain wireless systems and solve complex signal coverage problems. This includes designing custom wireless links for backhaul of remote system data such as for controlling or monitoring of remote IoT sensors and terminal units. As part of our total solution promise, we supply the infrastructure equipment including enclosures, power solutions, mounts, cabling, and more. Learn More

 

Cellular Amplifiers, High Gain Antennas & Cellular 3G Routers

NOTES:

> Lighting surge suppression devices critical if mounting antenna in the roof. Appropriate lighting device properly grounded in accordance with NEC or other applicable local regulations STRONGLY recommended more on lightning devices
> 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.
> Amplifier re-radiates boosted signal up to a maximum area. Consider carefully distance between the cellular device and the internal dome antenna.
> 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 the mobile device. 
> Need information on what frequency band your carrier is operating on in your geographic area if getting single band amplifiers. 
> Not all amplifiers or cellular routers are created equal

 
Drawing Link

 

Brief Description

 

Simple Omni-Directional Antenna Connected to USB Modem

Also includes a Cellular 3G router and lightning protection. Note that coaxial cable run from roof to modem is 75ft so need high quality (low-loss) cable such as the LMR-400 cable shown but even with this the attenuation is 4.4dB. Therefore need a powerful antenna such as the 9dBi shown to make up for the cable losses. Preferably a higher-gain directional Yagi antenna should be used instead but will require orientation to directional of maximum received signal strength.

 

 

 

 

 

 

 

Cellular direct-connect In-Building Amplifier, outdoor Omni-directional antenna

Improve in-building cellular coverage. System includes:

An outdoor antenna is Omni-directional:

Useful when you don't know the direction of maximum received signal strength or don't want to orient outdoor antenna. Receives signal from all directions.

 

Outdoor antenna is also dual-band:
work with both 800 & 1900MHz cellular systems.
An amplifier is direct-connect: Directly attaches to 3G/4G data modem for maximum power transfer
Includes WWAN router (optional) Converts cellular 3G/4G data to WiFi/LAN

 

 

 

 

 

Cellular direct-connect In-Building Amplifier, outdoor directional yagi antenna

Improve in-building cellular coverage. System includes:

 

An outdoor antenna is directional:
provides high antenna gain. Need to orient to the direction of maximum received signal strength.

 

Amplifier/Router/surge protection similar to the case above with Omni-directional antenna
Special case for Option Globesurfer III Fixed wireless Terminal
Special case for Axesstel MV400-Series Gateway. For other Axesstel modems and gateways see /Signal_Improvement/Axesstel

 

 

 

 

 

Cellular wireless In-Building Amplifier, outdoor Omni-directional antenna

 

Improve in-building cellular coverage. System includes:

 

 

The outdoor antenna is Omni-directional:
Useful when you don't know the direction of maximum received signal strength or don't want to orient outdoor antenna. Receives signal from all directions.

 

Outdoor antenna is also dual-band:
work with both 800 & 1900MHz cellular systems.
Work with both 800 & 1900MHz cellular systems. the amplifier doesn't physically attach to the modem. Allows using a single amplifier with multiple 3G/4G phones/modems in the same room.
Includes WWAN router (optional) Converts cellular 3G/4G data to WiFi/LAN

 

 

 

 

 

Cellular wireless In-Building Amplifier, outdoor directional antenna

Improve in-building cellular coverage. System includes:

 

The outdoor antenna is directional:
provides high antenna gain. Need to orient to the direction of maximum received signal strength.

 

Amplifier/Router/surge protection similar to the case above with Omni-directional antenna

Special case for Option Globesurfer III Fixed wireless Terminal

 

High Gain Yagi Antenna for Option Globesufer III

(Generic for any radio. Just change the antenna pigtail.)

1900MHz In-Building Solution for Extremely Low RSS & Wide Area Coverage

This is specifically where we need to cover a large room and the outdoor signal is very weak. This is specific for 1900MHz (hint Sprint PCS uses only 1900MHz but for other carriers need to figure out from their tech support or from the mobile device what frequency is in use). Note that if your outdoor signal is very strong you would need to use an appropriate attenuator to avoid saturating the high gain amplifier/ repeater

1900MHz In-Building Solution for Multiple Rooms

Similar to above but in this case we need the boosted cellular signal to cover multiple rooms. In this case, the distance to the room is close enough such that the losses through the coaxial cable and the -3dB loss through the splitter doesn't take the signal below the noise floor. For more splitters/combiners or diplexers see Radio Passives

WiMAX DRAWINGS

 

Generic WiMax USB Modem Dual Antenna Configuration (for 4G ONLY)

Pigtail options for Sierra Wireless 250U & Ubee PXU1900 (Clear 4G USB modem)

Simplified Construction Drawing for Portable Cellular 3G & WiMax 4G Internet Solution

Example of what is needed to place a Cellular/WiMax/WiFi router in a pelican case and drill through-holes for multiband Cellular/PCS/WiMax antenna and WiFi antenna including pigtails, cables, and connectors. We show solution using Sierra 250U modem available from Clear/Sprint but could be extended to any 3G, 4G or Dual 3G/4G modem. Contact us for alternates or variations.

 

 

Remote Mobile Communication Solution #2

A generic example of a communication trailer for example for emergency management. Shown here with the aggregation of 5 cellular 3G and WiMax 4G data modems for increased performance and redundancy. Design includes:

  • [Page1] Isolation of 3G Cellular & 4G WiMax RF paths with cross-band coupler/ diplexer for independent boosting (and to prevent filtering out of higher frequency Wimax band by 3G cellular bi-directional amplifiers).
  • [Page2] Splitting 2.4GHz WiFi RF path into two channels one goes to outdoor MIMO antennas and other go-to indoor antennas.

Shown for vehicle use but easily adapted to the building, remote sites, etc. Contact us for the entire solution and for your custom design based on specific constraints and target specifications.

WiMax Antenna Solutions for Digital Signage and Remote Kiosk Internet

Different topologies are shown for hooking up a remote dynamic messaging system or remote kiosk internet. Techniques are equally applicable for 4G LTE systems using equivalent LTE antennas (or multiband antennas to enable both 3G & 4G data).

 

 

1900MHz 3G Cellular & 2.5-2.7GHz 4G WiMax In-Building Solution (uses diplexer to re-use same coaxial transmission cabling)

To improve indoor coverage of dual 3G/4G systems. We use a high-gain directional cellular band antenna (1.9GHz PCS) and a high-gain directional WiMax antenna (2.6GHz). We pass the cellular signal through an RF bidirectional amplifier (BDA) and combine it with the WiMax signal using a low-loss 2-way diplexer. We then couple the signal to the 3G/4G modem. Contact us if interested in using MIMO diversity as well or see the forums.

High Gain Directional Antenna for WiMax 4G Modem

(for Xohm/Clearwire Zyxel Modem)

 

 

Clear 4G USB Modem (PXU1900) Outdoor Omni-Directional Antenna

Improving In-Building coverage for the Clear 4G USB Modem (PXU1900) using outdoor Omni-directional antennas (2 antennas used for full MIMO support).

Clear 4G USB Modem (PXU1900) Outdoor Directional Antenna

Improving In-Building coverage for the Clear 4G USB Modem (PXU1900) using outdoor directional panel antennas (2 antennas used for full MIMO support).

 

WiMax MIMO External Antennas (Omni-Directional + Directional Panel)

Shown in this drawing to include a Peplink MultiWAN router which combines multiple WiMax, Cellular or other ISP Internet connections for increased bandwidth. For example, if you have multiple LAN clients that need to concurrently upload or download data using a WiMax connection, you may combine multiple WiMax connections to improved average speed per client or for redundancy/failover.