Solutions by Industry

Oil and Gas Telemetry and SCADA

Mine Radio Underground Communications: Leaky Feeder Radio System Raveon’s data radio products are well-suited for wireless process control, wireless SCADA and wireless telemetry applications. With the fastest Transmit / Receive turn around time in the VHF/UHF radio modem business, your polled telemetry system will operate fast and efficient.

See this example of a pipeline-monitor using Raveon’s data radio.

Raveon’s Wireless Telemetry Product Features

  • RS232, RS422, and RS485 serial interfaces
  • Easy to use with built-in smart radio modem. Data In = Data Out.
  • Works with MODBUS, DNP, and most serial SCADA protocols.
  • 1/2-5 watts of RF output in the 450-480MHz (other bands available)
  • Range of 5-50 miles
  • Ultra-fast T-R switching time of 3mS
  • Store-and-forward repeater capability
  • Exceeding all FCC part 22 and 90 requirements
  • Remote “Ping” capability

Products for the Oil and Gas Industry

 

Wireless data modems

M7s Series Wireless Modems

Ideal for SCADA and Telemetry applications, the M7 series of products features: 1/2-5 watts of RF output in the 450-480MHz (other bands available), range of 5-50 miles, ultra-fast T-R switching time of 3mS, store-and-forward repeater capability, remote “Ping” capability, voltage, temperature, and current monitoring, and RS232/422/485 interfaces available.  Perfect for SCADA, remote control, telemetry, mobile-data, and AVL applications.

More Info…

Data radio modems Raveon’s RV-M5 FireLine series of data radio modems are a high-speed FCC refarming compliant data radio designed for telemetry, wireless data, GPS, and remote control applications.

Mine Radio Underground Communications: Leaky Feeder Radio System

Mine Radio Underground Communications: Leaky Feeder Radio System Raveon’s M7 series radios are well-suited for underground mine radio data communications. With the fastest Transmit / Receive turn around time in the VHF/UHF radio modem business, your polled telemetry system will operate fast and efficient within an underground data system using a pair of cables one of which is a radiating cable the other a “receiving cable”. – a setup commonly referred to as a “leaky feeder system“. “Radiating Cable” implies that the cable is designed to radiate or asborb RF signals: something that coaxial cable is not generally supposed to do.

A leaky feeder system is used for underground mining or tunnel environments where line-of-sight radio communication is difficult or impossible to achieve. Radios are connected with a coaxial cable with a receiver (Rx) port on one end and a transmitter port (Tx) on the other side of the radio.

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Raveon’s Mine Radio Solutions Feature

  • RS232, RS422, and RS485 serial interfaces
  • Easy to use with built-in smart radio modem. Data In = Data Out.
  • Works with MODBUS, DNP, and most serial SCADA protocols.
  • 1/2-5 watts of RF output in the 450-480MHz (other bands available)
  • Ultra-fast T-R switching time of 3mS
  • Store-and-forward repeater capability
  • Exceeding all FCC part 22 and 90 requirements
  • Remote “Ping” capability

mining

Raveon has a complete line of real-time GPS tracking products for open-pit min tracking, monitoring, and safety.

See all of Raveon’s GPS tracking products on our GPS Tracking website here: www.ravtrack.com

Smart Grid Wireless Solutions

wireless utilities management Raveon’s data radio products are well-suited for wireless meter reading, wireless SCADA and power grid management. VHF and UHF radio frequencies over very long range communication ability, and with the fastest transmit / receive turn around time in its class, hundreds of thousands of meters may be polled or report-in every day on a single radio channel.

Features of Raveon’s Wireless Data Modems for the Smart Grid

  • RS232, RS422, digita, USB, and RS485 serial interface options.
  • Very economical solutions. Raveon has narrow-band radio modems for under $190.
  • Easy to use with built-in smart radio modem. Data In = Data Out.
  • Works with MODBUS, DNP, and most serial SCADA protocols.
  • Internal ARM processor with spare resources to run custom applications and protocols.
  • 1/2-5 watts of RF output in the VHF(136-174MHz) and UHF(402-512MHz) bands. Other bands available.
  • Range of 1-10 miles urban, 5-50 miles rural, 10-120miles line-of-site.
  • Ultra-fast T-R switching time of 3mS
  • Store-and-forward repeater capability
  • Exceeding all FCC part 22 and 90 requirements.
  • Remote “Ping” capability

Products for the Wireless Smart Grid

M7 Wireless Modem

M7s Series UHF Wireless Modems

Ideal for data collection applications, the M7 series of products features: 1/2-5 watts of RF output in the 450-480MHz (other bands available), range of 5-50 miles, ultra-fast T-R switching time of 3mS, store-and-forward repeater capability, remote “Ping” capability, voltage, temperature, and current monitoring, and RS232/422/485 interfaces available.  Perfect for SCADA, remote control, telemetry, mobile-data, and AVL applications.

More Info…

M7s Series VHF Wireless Modems

With similar features as the UHF M7 series, the VHF M7 operate in the 136-174MHz band, providing even longer-range communications. The power-efficient design uses less power than any other brand radio modem in its class. It powers on/of very quickly, for very low-power sleep applications.

More Info…

Low-cost Embedded Wireless modems.

Raveon has a number of VHF and UHF radio modules that are well suited for monitoring and controlling the smart grid.

Let us customize one of our designs to meet your system and cost goals.

More Info…

 radio to IP gateway Cigorn Wireless Gateway

Raveon’sCigorn Gateway is an easy to manage gateway/router. It is simple to deploy, data centric, and very bandwidth efficient.  It dynamically assigns wireless bandwidth to operate even when 100% of the subscriber devices need to communicate. It provides a single interface to a wide-area network of radio modems.

Cigorn is optimized for applications such as meter-reading, utility-monitoring, and GPS tracking. The Cigorn Gateway is built using powerful computing hardware, feature-rich software, and sophisticated communication protocols. But because Giga-bytes of RAM are cheap, GHz processors are cheap, and Open Source Linux software is free and reliable, the Cigorn Gatway is more sophisticated than comparable systems, and yet costs very little to deploy.

Use Cigorn Gateways to consolidate all your wireless interfaces, modems, protocols, and links into one manageable device.

More Info…

Low Latency Streaming

Overview

Low-Latency Streaming provides a continuous data feed from one modem to another, with less than 8 millisecond delay between the data entering one M7 and leaving the other. This mode is ideal for control of UAVs and other robotics as it provides a real-time response to control commands.

The M7’s low-latency streaming mode can provide a transparent, continuous 9600 baud stream from one modem to another.

Low-Latency Streaming Mode is available in M7 model radios via a firmware option specified at order time.

Differences from Other Modem Modes

In data modems, including the M7, data coming in to the modem for transmission is packetized before sending over-the-air. Packetizing data has a number of benefits, the two largest being that metainformation can be added to the data and checksums can be calculated. Packetizing data increases the overall range and reliability of the data modem substantially, while adding the necessary information to the packet to create diverse and complex networks. Packetizing data has two tradeoff costs: data bandwidth and latency. Streaming mode optimizes the data transmission for these.

The airtime used for the packetizing such as preambles, packet headers and checksums reduce the usable data bandwidth a little, depending on the ratios of packet length to headers. To provide a continuous stream, low-latency streaming mode removes these packet features and provides more useable data bandwidth.

Removing packetization provides an extremely large latency reduction. In packet mode, the latency of a piece of data within a packet is the length of time it takes to receive the entire packet into the modem, plus the time to transmit the packet over-the-air. The modem must receive the entire packet before it can begin transmission of the data, then the receiving modem must receive the entire packet to verify its integrity before it can begin outputting the data. In low-latency streaming mode, each data byte is transmitted immediately:

Drawing1

 

Example comparison between packet mode and streaming mode for a 60-byte piece of data with a 9600 baud serial link and 9600 baud over-the-air rate.

In general, most systems will want to use sync loss filtering, since it reduces the occurrence of bad data output. However, some systems may want to turn this off entirely, which instructs the receiver to output a constant stream of data, even if no sync can be detected. This is beneficial if the system design already includes a packet format with checksums or other measures of transmission success. In this case, the system’s packet format can be used to determine if the data has been received correctly or not, allowing the modem to output data that might have otherwise been dropped due to sync loss.Low Latency Streaming is only available as a custom firmware installation on the M7. Modems will be available with part number –SMR for stream receivers and –SMT for stream transmitters (e.g. RV-M7-UC-SMR).

Streaming mode is designed and optimized for a 9600 baud link over a narrow or wideband channel.

The follow sections detail the configuration decisions and settings that must be set for a low-latency streaming system.

Sync Loss Filtering

Sync Loss Filtering at the receiver allows the modem to suppress stream data output if it has determined that it lost the stream lock.

To enable sync loss filtering, issue the following command:

ATSS 1

Timeout Time

There are a few configuration options to consider when setting up streaming mode. The first is the timeout time. In streaming mode, the transmitter sends a continuous transmission that the receiver locks onto. If no data is available to send over the channel, an idle pattern is generated to allow the receiver to stay locked and ready to receive any real data that is transmitted.

There is a tradeoff here between the transmitter being keyed during the idle period (generating excess heat) and the receiver having to lock on a freshly started stream (creating a startup delay). This tradeoff is adjusted using

TXTOT x (Set x from 1-60 to configure how long transmitter will stay keyed if no data is present)

When a character is input at the transmitter and it is unkeyed, the stream is started and the timeout timer begins. Every time a new character is input at the transmitter, the timer restarts. Note that stream synchronization at the receiver usually takes a few hundred milliseconds, so it is likely that the first characters sent during this time are lost.

Other Required Settings

Streaming mode is a special protocol, set separately on the transmitter and the receiver. To enable streaming mode

ATMT 5 (to set to a stream transmitter)

ATMT 6 (to set to a stream receiver)

Finally, the baud rate must be set:

ATR2 8 (Over-the-air modulation set to 9600bps 4L)

It is recommended to set the serial port to 9600 baud as well. This will ensure more data cannot be provided to the modem than the stream allows. However, if this is not a concern, then setting the serial baud faster can further reduce latency delays (in a pulsed-data scenario).

ATBD 9600

ATMT 5 or ATMT 6 (Set as a transmitter or a receiver, respectively)

ATSS 1 (Optional. Require streaming sync to receive)

leaky feeder info

Leaky Feeder Radio Systems (using a radiating cable)

All Raveon data radios can be equipped with a radiating coaxial cable as an antenna for use as a leaky feeder system in areas such as, underground mines and railways, inside industrial buildings, and any other enclosed area where direct line of contact may be difficult to produce with a standard antenna. Leaky Feeder systems are the best way of communication in underground mines currently available.

radiating cable 2Leaky Feeder systems work by using a specially made coaxial cable, radiating cable, as an antenna, which is designed specifically with slots cut into the outer shielding to let the radio waves it would normally carry to a standard antenna, in and out along the length of the cable. Doing this turns the entire cable into one long antenna emitting and receiving along the entire length. This process makes the signal weaker over the distance of the cable and eventually gets to a point where the radio waves transmitted are to weak to be of use. Because of this problem, the use of line amplifiers is required at points between 350-500 meters, to boost the signal back up to a receivable level by your other points of contact.

 

RSSI and Communication Range

Radio Signal Strength Indication (RSSI)

All Raveon data radio modems have a built in RSSI indicator to help determine the signal strength of a received radio modem signal.  Raveon GPS tracking products also include location (latitude/Longitude) with the RSSI information which makes RF propagation analysis very simple.

RSSI is usually expressed in dBm which is decibels relative to milliwatts of received power.  0dBm = 1 mW.  Every time  the  received power drops in half, the RSSI will change by 3dB.  .5mW = -3dBm.   .25mW = -6dBm and so on.  Everytime the received power drops by 1/10th, the RSSI will drop by 10dB.  1/10 of a mW is -10dBm.  1/100th of a mW is -20dBm,  1/1000th of a mW is -30dBm and so on.

Radio Signal Strength (RSSI) will drop the further away a receiver is from the transmitter it is receiving.  This is a square-law phenemoena, so the received signal will drop by at least 1/4 every time the distance from the transmitter doubles.  1/4power is a 6dB drop in RSSI, so when a receiver with a given RSSI moves twice the distance from a transmitter, the RSSI will drop at least 6dB.  For quick range calculations, assume 6-10dB drop for every doubling of distance.

Radio Range

For example, in the above image, if the center dark-blue circle were 1/2 mile across at -70dBm signal, the -80dBm range would be about 1 mile, the -90dBm circle 2 miles and the -100dBm circle 4 miles across.

But, remember that most all communication systems on earth are limited by terrain not line-of-sight distance.  A 5 watt radio modem transmitting 5 watts of RF can be received thousands of miles away in free-space.  On earth, it may only be 1 to 100 miles.  Terrain, antenna heights, foliage, buildings, interference, and antenna gains play a huge role in determining how far a radio can communicate.  Also due to multipath, moving objects, and varying antenna positions, the RSSI at a typical location in the fringe area of reception will often vary 10dB – 20dB over a short amount of time (seconds).  This may cause sporadic reception, but with a good communication protocol, the 20dB drop-outs will not be noticed.

Signal strengths near a base station  are typically in the -30 to -60dBm range.  Most Raveon radios can measure an RSSI as large as -60dBm.  Above that, they will report some maximum value such as -58.  The upper limit varies by model.  Here is a rough summary of RSSI signal implications.

 

 RSSI Level

 Comments

  -30 to -60 

 Very strong.  The receiver is very near the transmitter or base station.

 -60 to -90   Excellent signal strength.  Usually the close to 100% coverage and reception.
 -90 to -105  Good reception, but occasional missed data.
 -105 to -115   Reception can be 100% but often will have drop-outs/blind spots when the average signal is this weak.
 -105 to -120  Signal reception will be sporadic.  Don’t design a reliable system to work with this weak of a signal unless you utilize an error-correcting and lost-message protocol.

 

 

 

 

Product Engineer (Electrical)

Purpose: Develop network software for deployment in large-scale distributed
systems

Raveon Technologies is an expanding organization, focused on the wireless industrial and machine-to-machine (M2M) communication markets.

Raveon is growing its engineering team to support the expansion of a contract to build the nation’s first nationwide data network tailor-made for M2M communication.

Position Responsibilities

  1. Electrical Design of Baseband and Digital Systems. Drive development from simple concept to a feature-rich finished product. Suggest additions to product requirements, then design and implement from block diagram to PCB bring-up, debug and optimization.
  2. Mechanical Concept Design and Implementation. Develop product packaging concepts and manage product packaging development. Highly-qualified candidates will develop mechanical designs for simpler products and work closely with mechanical engineers to create rugged, reliable products.
  3. Prototype Bring-up and Debug. Follow product design with hands-on bring-up and detail-oriented test and optimization of design. Highly-qualified candidates will write firmware for straightforward products and will work alongside Raveon’s embedded software engineers when need dictates.
  4. Transfer to Manufacturing. Design with the appropriate production quantity in mind, tailoring process to suit both small concept products and large overseas production runs. Design and create documentation to support test and transfer to manufacturing. Train production personnel as needed and periodically receive feedback on improvements to speed manufacturing.
  5. System Design. Suggest the use of Raveon products in larger systems. Detail how specific existing or adjacent possible designs can be used in innovative ways.
  6. Ongoing Design Support. Continue engagement with all Raveon designs through improvements based on field testing and customer feedback.

Skillset
Digital Circuit Design, Power Supply Design, Baseband Audio Circuit Design, Schematic Capture, Design for Manufacturing, Manufacturing Documentation, Project Management

Beneficial Skills
Layout, Embedded C, Mechanical CAD, Waterproof and Mil-Spec product design, Sub-GHz RF design

 

If this opportunity is of interest to you, please send an introduction and your resume to our dedicated recruitment e-mail.

Networking Systems Software Engineer

Purpose: Develop network software for deployment in large-scale distributed
systems

Raveon Technologies is an expanding organization, focused on the wireless industrial and machine-to-machine (M2M) communication markets.

Raveon is growing its engineering team to support the expansion of a contract to build the nation’s first nationwide data network tailor-made for M2M communication.

Position Responsibilities

  1. Server Software Development. Design, develop and debug software to drive large scale wireless networks and interconnection of cellularized data networks. Create reliable, long-running communication platforms and interfaces. Develop distributed algorithms for intelligent routing of customer data while maintaining integrity and secure compartmentalization of data.
  2. Protocol Design Support. Suggest improvements to custom networking protocols and low-layer designs. Create simulations and test implementations of protocol designs and implement final protocol design in portable libraries.
  3. OS Configuration and Embedded System Design. Create software that will run on purpose-built hardware. Design installation procedures and OS images to support continuous software operation and error recovery without operator intervention.
  4. Transfer to Operations. Ensure software can be operated and debugged by multiple levels of users. Create software with reliable logging capabilities, command-line interfaces, web GUIs and developer APIs. Train operations personnel on software operation.
  5. System Design. Suggest the use of Raveon products in larger systems. Detail how specific existing or adjacent possible designs can be used in innovative ways.
  6. Ongoing Design Support. Continue engagement with all Raveon designs through improvements based on field testing and customer feedback.

 

Skillset
C++, C, Linux, TCP/IP System Design, Operating System Theory, Distributed System Design, Network Security

Beneficial Skills
Embedded C, Wireless Network Design, Communication Theory, Digital Electronics

 

If this opportunity is of interest to you, please send an introduction and your resume to our dedicated recruitment e-mail.

DART Dynamic Automatic Radio Transmission overview

image

1 Overview

DART (for Dynamic Automatic Radio Transceiver) is Raveon Technologies Corporation’s wide-area wireless networking technology. Unlike most all other radio trunking systems, DART is optimized for data,  M2M, telemetry, GPS tracking, and meter reading instead of two-way land-mobile voice. The DART trunking system builds on many of Raveon’s existing, proven technologies to create a new class of user devices and base stations.

DART is a combination of wireless protocols and technologies that together can make a very versatile wide-area radio network on narrow-band data radio channels.  It is designed to be the ideal M2M platform.

2. Wireless Device Classes

DART is provisioned to communicate to a number of different “Wireless Device (WD)Classes”.  The protocol interacts differently with the different classes, allowing manufacturers to provide devices that are optimized for various applications.  Most wireless protocols are optimized for a particular voice application, but DART accommodates many different use cases, optimized for data communications and GPS tracking.

A list of the initial Wireless Device (WD) classes a DART system supports is shown below.

Data Modem: (Very interactive communications with the base station) Used for one- and two-way data communications, M2M, SCADA, radio telemetry, text messaging, and remote control.  Communications to/from WD is via the base station and other WDs.

GPS Transponder: (Timed information reporting with light base station interaction) Used for GPS tracking of vehicles and personal locators. Tracking information and alerts are available to the end user either via connection to DART distribution network, or directly received over-the-air.

Meter Reading and SCADA: (Very infrequent interaction with base station) Used for communications to/from low-power radio modems that infrequently communicate with the system.

 

DART Feature Wireless Device Class
  Data Modem GPS Tracker Meter Reading /SCADA
Dynamic Configuration of groups, frequencies, power management, report rate, and authorization. Yes Yes Yes
Dynamic Data Bandwidth Yes
Roaming and Base Hand-Off Yes Yes
Autonomous Reporting Yes Yes
Bandwidth Priority by Net, Group Yes
Reporting Rate Priority by Net, Group Yes
Local communication without base Yes Yes Yes
Group, Net, and ID data broadcasts

Yes

Yes Yes
Group, Net, and ID Range Mass-Poll Yes Yes
Small-slot compression using slot assignments by ID and delta position reporting 

Yes

3. DART M2M Platform Features

1. Quickly deploy new radios into complex systems
2. Configures radio modems dynamically, based upon current system needs and settings.

a. Over-the-air channel/frequency assignments
b. Data transmission bandwidth allocation
c. Reporting rate
d. Priority levels and group membership
e. Base Station to associate with
f. Uses local IDs (LIDs) to communicate with WD’s, shortening the OTA packet size.
g. Many other parameters based on radio model and user needs
h. Delivers data packets reliably over the wireless network, fragmenting, retransmitting, and reconstructing them as needed.

3. Assigns channel bandwidth dynamically to devices needing to communicate
a. Retry interval and duration is managed by local base station based on loading and QOS
b.  WDs automatically find the a local base station to link-up to when they power on.

4. Balance the data communication loads based upon device priorities, system configuration and minimum QOS.
5. Utilize additional RF channels when available and as needed. Assign channels dynamically.
6. Timed configuration assignments for remote and out-of-comms continuous operation.
7. It has the capability of handling voice traffic, particularly VOIP sourced voice.
8. Very flexible ID scheme allowing for up to 4 trillion nodes.
9. End users can to assign their own IDs to their own nodes and configure message routing and deliver based on device ID, the ID they assigned, or groups the WD is a member of.
10. WDs may be assigned to groups.  Single messages may be sent to groups of WDs.  Messages may be routed to/from groups.

4. System Overview

A DART wireless network can support millions of Wireless Devices (WDs) such as radio modems and GPS trackers.  Using one to hundreds or base stations, each with one to dozens of RF channels, a DART network can span a city or a country.

DART Network

DART Network

WD:  A Wireless Device used for SCADA, meter reading, telemetry, GPS tracking, …
BSC: Base Station Controller that controls one more more transceivers at one or more base sites.
Master Gateway.  A Linux base data router that handles routing data, deviced authentication, security, and logging.

The  first generation of WDs Raveon has incorporated DART technology into is the M8 series of OEM data radio modems:  http://www.raveon.com/RV-M8S.html 

DART is a trademark of Raveon Technologies Corporation.  Contact Raveon Technologies Corporation for more information.

 

220MHZ Band Antennas

VHF and UHF antennas are easy to find, but 220MHz band antennas for data radio modem are more difficult to find.  This Tech Blog article provides links and ideas for sourcing 220MHz mobile antennas and 220MHz base station antennas.

1.   Overview

Raveon produces data radio modems at 200 MHz for Machine-to-machine (M2M) and SCADA applications.  Commercial off-the-shelf (COTS) antennas for this band can tuned to 220MHz.  This note details the process for the tuning of VHF 220 MHz antenna.  Raveon’s DART base stations and M8/TK8/TK9 series data radio modem products are available in this band.

2.   COTS Antennas

There are many different choices for 220MHz band antennas . This article identifies a few antennas suitable for use with 220 MHz radio modems.

New-Tronics Antenna Corporation

RX-220, 3.4 dB, 5/8 wave magnet-mount mobile antenna:
(http://www.new-tronics.com/main/html/mobile_uhf___vhf.html)

MX-270, 2.4dB VHF/ 4 dB UHF   magnet-mount VHF – must be cut down to resonate at 220MHz.
(http://www.new-tronics.com/main/html/mobile_mx_series_uhf___vhf.html)

Comet

HT-224, 1.3dBi 1/4 wave
(http://www.cometantenna.com/products.php?CatID=1&famID=1&childID=2)

This antenna may be available at their distributor, Ham Radio Outlet.

22ANT

Trimming an Antenna

The test equipment for tuning includes a spectrum analyzer, such as HP 8591E with tracking generator and a directional coupler, such as Narda 3000-10 and suitable connectors/adaptors. The antenna length can be adjusted by trimming the length of the rod of the antennas. Loosen the lock-screw on the base of the antenna, remove the antenna rod, and trim it so that the antenna resonates on the desired frequency. Trim a little, re-install, re-measure resonant frequency, and repeat.

The lowest standing wave ratio point displayed on the spectrum analyzer will be the frequency the antenna is tuned to.

For 220MHz, the lengths of the antennas shown above are 706 mm for the RX-220 and 524 mm for the MX-270.  The HT-224 from Comet has fixed length which is not adjustable.

sa221