2.4 Ghz Rf Module

Wireless survivor € ™ s Guide: Surviving to 2.4 GHz low power

Executive Summary

What = "http://www.cypress.com/products/?gid=14 href"> wireless sensor networks, wireless sense and control the growing industrial and demand for personal area networks have in common? Two things: Wireless, ultra low power consumption. Historically, these two have always been contradictory, due to physics and the energy required to transmit signals, and recently, in response to the growing number of wireless solutions € "congestion. If you thought the spectrum of 2.4 GHz of wireless spectrum has become overcrowded, Leta € ™ s review some of the new wireless technologies, which soon will join the party. A quick review of the list of the 2009 International CES Innovations honorees, as well as exhibitors include: Several Wireless-N Routers Gigabit network, Wireless HD Video / Audio, Blu-ray Wireless, Wireless headphone / speaker, Wireless Sensor Networks, and the list goes on, and this is only the annual Consumer Electronics Show. The list grows exponentially when you include lighting control, home automation, automatic meter reading, building control and automation and industrial process control and automation applications. We are witnessing an evolution wireless exciting! This evolution has taken up thanks to numerous innovations in wireless technologies themselves as well as the radios are used to transmit and receive signals € "itâ € ™ s obvious that would not be where we are today, if every wireless application requiring large power sources and difficult to apply or had to be recharged every hour or two.

How have 2.4 GHz wireless technologies tailored to meet these requirements? For solutions wireless capabilities, the response has been historically to reduce energy consumption of the components that make up the solution € "that the microcontroller and radio transceiver. ™ € s Moorea this law as the response continues to improve, however, now at a rate of diminishing returns. What was 100s to 10s milliamperes improvements in fuel economy is already close to 5 and 1 milliamp differences in efficiency. Therefore, Whata € ™ s next? How can we further improve energy efficiency in our integrated wireless systems? As with most innovations, we must think outside the box and look at these solutions in the context of the systems used. In particular, instead of focusing only on the energy efficiency of the components within the system must analyze their interactions in the system. I propose that the most important factors that play a role in further increase this efficiency is a combination of the protocol or algorithm that adapts to changes in the environment and the system functions and capabilities that enhance reliable communications between devices in the system and reduce the number of wireless transmissions. In this article, I'ma € ™ ll highlight how these two changes in the way they view wireless solutions Embedded can help developers and designers survive the 2.4 GHz spectrum at low power.

Adaptation to environment

Adaptation to the environment is an evolutionary efficiency running inside our DNA. If the world had no land mass or even land masses less it is done, we can all have webbed feet and possibly up to the gills, as our DNA naturally evolve through natural selection, only the strongest and better adapted to the environment would survive. In a similar context, wireless technologies that have the ability to adapt to RF environments increasingly overcrowded is surviveâ € "and, through the law of transitivity, so will the systems used.

Adaptation in the context of technology wireless is the ability of a system to measure and respond to the hostilities faced thema € "mainly the RF interference. A system that can detect RF interference, or interference effects that can then implement countermeasures to respond appropriately. For example, Leta € ™ s Suppose we have a wireless technology that can measure the signal strength of receiving a communication operation. Based on this signal strength and knows the baselines ideal for harsh environments and a technology can know what the environment and how it seems ideal or the environment is tough. A less elegant means of knowing the environment may include detecting the media also failed attempts. The latter method, however, becomes a more reactive approach to the activation of adaptation and therefore would be less effective, but equally effective for the end. Regardless of the method of evaluation and understanding of the environment, The next step is being able to respond € "the physical action of adaptation to the medium ambiente.La Act environmental adaptation of technologies wireless capabilities is quite large, but can include actions such as changing output levels € "speak softer or stronger, the activation of a more robust € communicating "speak more clearly, increasing the speed of communicating €" talk faster, or moving to a quieter environment to communicate. The first response of the evolution of output in response to the environment has a clear logical sense terms of reduced output in an RF quiet environment, can be counter-intuitive as the reverse. In a noisy environment and a wireless application integrated where power is like gold, the act of using more energy to achieve the same communication through sounds expensive. But leta € ™ s review what happens if you donâ € ™ t. Assuming all other things remaining the same and constant, a radio transmitting power levels to lowerthan needed to complete a communication transaction is attempted repeatedly transmitted over a short period of time and more-than-likely, more power burn a solution that immediately transmits the same data in fewer attempts for greater power output. Leta € ™ s throw some math in this example to help to explain this second intuitive approach. First, the setting: a radio is configured to transmit to +4 dBm, or 34.1mA, per transaction and a second radio is configured to transmit a-5dBm, or 20.8mA, per transaction. Power needed to transmit the data is defined as the number of attempts multiplied by the power per transaction for each of the radios. In this case, itâ € ™ s very clear that if the +4 dBm radio can transmit data in one pass, while the other radio-5dBm, has more than one attempt, 4 dBm radio burned less energy to obtain the same data through. Whata € ™ s important here, however, is a system ™ € s ability to dynamically raise or lower the power required in response to the Environmenta € "use more power when needed they do not need to be preserved. Another way to respond to the RF environment is the ability to speak slowly and clearly, or its inverse, faster. In a hostile environment, if a system dynamic can turn half slower but more robust communications, may be able to improve their ability to cope with the effects of interference without affecting to her communication.

Here are two examples of doing just this:

1. using modulation schemes such as Direct Sequence Spread Spectrum, and

2. Advanced error correction at the time in transit. Direct Sequence Spread Spectrum (DSSS) is a modulation scheme that essentially spreads its signal in a relatively larger signal that allows more than the original signal is received, even if there is a sign of greater power in the same area spectrum. Another use of DSSS is to take the underlying principles and apply it to the data portion of a packet that is transmitted, and eventually have a more robust error correction forward. In the latter case, for example, one can encode a smaller piece of data over a wider package of data and then transmit packets data. Thus, the system can cope with the interference and still get the message.

The inverse of this method of adjusting is knowing when the interference is less worrying and take advantage of the quieter environment by providing a more even pace means less robust. Again, the important aspect of these methods to adapt to the environment is the dynamic medium of exchange between these two approaches.

Finally, the method available next, but certainly not least, is to respond physically to move to a quieter environment in the presence of noise. Two methods used today by some technologies are a constant and predictable movement across the spectrum, and another approach that moves only when necessary. While both are relatively effective, the latter is more efficient because 1) the system moves less often, and 2) the system locates and moves to quiet environments instead of a jump that can result in constant motion unless the spectrum ideal areas sometimes.

As with most of the responses to the challenges, the best approach for adaptation is a system to be able to adapt dynamically through these three dimensions. A system that can detect and respond to a multitude of countermeasures will be better able to adapt to a variety broader environments and minimize energy consumption.

Reliability Efficiency =

Due its importance, leta € ™ s to further discuss how reliability leads to improved energy efficiency in a system. Reliability in this context is the ability to a wireless solution to communicate with minimum broadcasting. Relay, as seen above, is a means of communication in face and in no way is a method of adaptation to an RF environment. How many times have we heard the clichà ©, work smarter, not more? This is true in RF systems as well. One response to increased reliability ™ € systematize s to overcome a hostile work environment is clearly more intelligent, while that the act of broadcasting constantly for the same data in the act of working more and is less efficient. When does the reliability in the cost of efficiency? When the application of technology has no need of redundancy or robustness that can be implemented to increase reliability. So, as noted above, the supplier end of the efficiency and therefore the ability to survive in the 2.4 GHz spectrum at low power is the ability to adapt to their environment, or more importantly, their ™ € Customerâ s diverse environments.

Conclusion

So, how does it compare wireless technologies to determine if one is more efficient than the other? To quantitatively assess both is to make each test in an environment consistent with the final application. Although expensive and time consuming, this method results in better analysis and provide the true indicator of the solution that will lead to better efficiency. A qualitative analysis, in addition, can provide a less costly and timely to evaluate these solutions € "or to reduce the number of solutions it wishes to adopt for quantitative analysis. This can be done easily by simply answering the following questions for each of the solutions proposed € "™ € more Yesa s more then the system will be able to adapt to their environment and more efficient than the solution is in the final.

Review: Hitec Spectra AFHSS 2.4GHz receiver and Optima 7 module (part 1)

DefaultFeatured itemsBestsellingAverage customer review: high to lowPrice: low to highPrice: high to lowAlphabetical: A to Z

Wireless Rf Mini Multimedia USB Kyb with optical Trackball 2.4GHZ Blk List Price: $69.99 Sale Price: $59.47 You save: $10.52 (15%)   Eligible for free shipping! Availability: Usually ships in 24 hours See Reviews For This Product Description Enjoy the freedom of wireless connectivity with Adesso's wireless mini Keyboard with Optical trackball. The keyboard and trackball allow you to work up to 100 feet away from the USB receiver connected to your computer. In addition, the optical trackball provides great accuracy with minimal hand movement due to its 800 dpi resolution. The lightweight and stylish keyboard offers mobility and comfort wherever you type. Take complete control of your desktop with hotkeys. The different hotkeys give you quick access to some of your most common tasks such as e-mail access, volume control, and launching your web browser - at the push of a button. Features Streamlined full-featured RF keyboard built-in 27mm Track Ball, with Optical Technology 2.4 GHz radio frequency, 100 feet effective working range 360-degree navigation, sleek and elegant design With notebook keyboard module enables handheld operation and effortless typing 8 different frequencies with 65536 IDs per channel

Leviton 47690-8C 1x8 Passive TV/CATV Splitter Module with Bracket List Price: $31.66 Sale Price: $31.52 You save: $0.14 (%)   Eligible for free shipping! Availability: Usually ships in 24 hours See Reviews For This Product Description 1X8 Passive Video Splitter, 1 GHz for LIN Integrated Network, Structured Media, Video Distribution, UPC: 07847704656 Features Split video signals with outputs for 4, 6 or 8 televisions depending on unit Provide digital cable, cable TV and other video services via coaxial cable to any room in a house or office Size: 1.40"(35.6mm)H x 6.58" (167.1mm)W x 2.65"(76.2mm)D Durable gold-plated 360 insert pin resists oxidation, maintaining distortion-free signal for digital data transmission Weather sealed F-ports up to 30 P.S.I

DSI 2.4GHz Wireless Keyboard with Optical trackball, Black, FK-760 List Price: $79.99 Sale Price: $62.87 You save: $17.12 (21%)   Eligible for free shipping! Availability: Usually ships in 1-2 business days See Reviews For This Product Description The FK-760 radio wireless compact keyboard is one of the best computer input devices in the market today. It combines the convenience of radio frequency wireless technology with a built-in optical trackball that features two sets of mouse keys and a scroll wheel. Since it is a wireless keyboard it is a great space saver. The FK-760 features an ergonomic design allowing comfortable use on your desk and even your lap. Features Streamlined full-featured RF keyboard built-in Track Ball, with Optical Technology 2.4 GHz radio frequency, USB Receiver Connector. 10 meters effective working range, farthest amount to 30 meters. 360-degree navigation, sleek and elegant design. With notebook keyboard module enables handheld operation and effortless typing.

nMEDIAPC HTPCKB-B Black 2.4GHz RF Wireless Streamlined Keyboard with Track Ball & Remote Combo Set Sale Price: $95.99 See Reviews For This Product Description nMEDIAPC HTPCKB-B Black 2.4GHz RF Wireless Streamlined Keyboard with Track Ball & Remote Combo Set Features 2.4GHz wireless Keyboard and Remote Control combo set using one USB receiver dongle 360-degree navigation with Scroll Wheel Sleek, elegant and all-in-one design Microsoft Vista Media Center Hotkeys built in Remote Control Notebook keyboard module-and-enables handheld operation and effortless typing

JBL Control 2.4G On Air Wireless Speaker System (Pair) List Price: $349.00 Sale Price: $186.95 You save: $162.05 (46%)   Eligible for free shipping! Availability: Usually ships in 1-2 business days See Reviews For This Product Description Add a pair of speakers in the bedroom, in the kitchen, in the garage or on the patio. JBL On Air Control 2.4G wireless speaker system combines high-performance sound quality with wireless-installation convenience. The unit includes a pair of wall-mountable loudspeakers that incorporate a wireless transceiver and amplifier, a transmitter/receiver module, and a remote control. This system is ideal for a host of wireless-speaker applications, including use as the surround channels in a multichannel home theater, as a second-room music system, and as a high-quality wireless speaker system for computers and digital music players. The On Air Control 2.4G utilizes the 2.4GHz frequency range for interference-free transmission, and the transmitter/receiver module can be used with up to two pairs of JBL On Air speakers. The active speaker system includes a mini-jack input for connection to a second local audio source and a subwoofer output that enables the speakers to be used as part of a 2.1-channel satellite/subwoofer audio system. The 100mm polylaminate woofer produces rich, deep bass response, while the 12mm titanium-laminate tweeter delivers sparkling, clear high frequencies throughout the listening room. Easy-to-use wall brackets are included. Features Wireless system lets you add speakers without running wires 2.4GHz ensures high performance sound up to 70 feet Ultra-compact monitors Magnetic shielding for video applications Wall brackets included for speaker and transmitter

JBL WEM-1 50-Watt Wireless Amplifier and Expansion Module (Black) List Price: $359.00 Sale Price: Too low to display   Eligible for free shipping! Availability: Usually ships in 24 hours See Reviews For This Product Description The JBL WEM-1 is a Wireless Expansion Module that allows the user to make any loudspeaker wireless. The kit contains a transmitter that wirelessly transmits a signal up to 70 feet. The WEM-1 includes a receiver/amplifier that receives the wireless signal and drives any pair of loudspeakers with its internal 50 watt amplifier. The transmitter connects to the source using either line or speaker level inputs. The receiver/amplfiier also offers equalization settings for several speakers. A local input allows the user to hook up a portable device or gaming system to the amplifiier. Features The JBL WEM-1 can transmit music throughout your home. Can transmit music up to 70 feet. Comes with a 50 watt amplifier. Add surround speakers to your home theater system without having to run wires. Connect to your computer and enjoy your music library anywhere in your home.

Wireless Mini Kybrd with built-in Trackball for Htpc By Ergoguys List Price: $73.99 Sale Price: $61.59 You save: $12.40 (17%)   Eligible for free shipping! Availability: Usually ships in 24 hours See Reviews For This Product Description Product Name: 01027 Wireless Mini Keyboard with Optical TrackBall Marketing Information: Streamlined full-featured RF keyboard with built-in trackball optical technology. 2.4Ghz radio frequency, 15 meters effective working range, USB port 360-degree navigation, sleek and elegant and notebook keyboard module design, enables mobile operation and effortless typing. Perfect for Home Theather PC Keyboard/Keypad Keyboard/Keypad Type: Keyboard Keyboard/Keypad Connectivity Technology: Wireless Keyboard/Keypad Wireless Technology: RF Pointing Device Pointing Device Type: Trackball Integrated Interfaces/Ports Interfaces/Ports: 1 x Type A Male USB Physical Characteristics Dimensions: 1.97" Height x 15.16" Width x 7.01" Depth - Keyboard Dimensions: 0.39" Height x 0.85" Width x 3.07" Depth - Receiver Features Wireless frequency: 10 meters. Integrated optical trackball. 4-AA batteries included for up to 3 months use. Notebook keyboard module enables handheld operation. Compatible with Windows ME/NT/2000/XP/Vista

BAR TYPE CAM W/RF RECEIVER MODULE BLACK Sale Price: $148.95   Eligible for free shipping! Availability: Usually ships in 1-2 business days See Reviews For This Product Description Boyo Vision's wireless rear view cameras are absolutely state of the art. These water and rust proof cameras feature an attractive Black finish. The mount is not only stylish but also allows full up and down pivoting of the camera for an optimal image. These bar type cameras look like high quality vanity plate and the camera portion is barely noticeable. The VTX420 allows any video receiver with RCA inputs to be added, allowing you to view the rear view camera. With Boyo Vision rear view cameras safety is an easy installation away.-- Specifications of Camera:# Super Slim Bar Type CCD Wireless Camera # Built in wireless transmitter # Fits most cars # Simple Installation # Beautiful and sleek design # Anti-scratch coating # 1/3 DSP Color CCD # Resolution: 512 x 582 pixels # 420 TV Lines # 320,000 Total pixels # Minimum illumination: 0.5 Lux at F2.0 # Signal-to-noise Ratio: 48 dB # Electronic Iris: 1/50 to 1/1000 sec # Automatic white balance # 2.88mm Pinhole lens # Operating temperature: -4°F~ +122°F (-20°C~ +50°C) # Storage temperature: -40°F~ +176°F (-40°C~ +80°C) # Water proof: Ip67 # Wide angle: 130° # Black ColorSpecifications of Wireless Receiver Box:# Built in wireless Transmitter # 2.4 GHz wireless Frequency # 4 channel preset # Video RCA Outputs for adding any external Video device Features Super Slim Bar Type CCD Wireless Camera Built in wireless transmitter Fits most cars- Simple Installation 2.4 GHz wireless Frequency Black Color

Swann Guardian Angel Handheld Monitoring Kit See Reviews For This Product Features See and hear your baby from anywhere in your home Built-in 2.4GHz RF modules for smooth reception Wireless transmission range up to 100 meters Switchable between 4 channels Includes automatically activated infra-red LEDs for night vision

Wireless Keyboard Space Saver with Optical Trackball By Ergoguys List Price: $79.00 Sale Price: $49.41 You save: $29.59 (37%)   Eligible for free shipping! Availability: Usually ships in 1-2 business days See Reviews For This Product Description Take advantage of the KB-RK-750, the latest keyboard in our line of DSI 2.4 GHz Wireless Optical Trackball Keyboards. It combines the convenience of radio frequency wireless technology with a built-in 800 dpi optical trackball and two separate sets of mouse buttons and a scroll wheel. Suitable for lefties or right handed players. This sleek keyboard with its elegant ergonomic design is a great space saver. This is loved by computer users and gamers alike because it is great for the desk, yet small enough to be comfortable in your lap.Features: Built-in Track Ball & Mouse key, Scroll Wheel; Keyboard & Mouse in one. 2.4 GHz wireless with 8 channels. 360-degree navigation. USB Receiver Connector. Bidirectional RF frequency. Notebook keyboard module makes this perfect for handheld operation Two choices for mouse browsing o 800 dpi Optical Trackball on the right side with mouse buttons on the underside outer edges of keyboard o Scroll Wheel with mouse button located on left side of keyboard Hot keys: Prev-page, next-page, WWW, e-mail, my computer, prev-track, next-track, stop, play / pause, mute, volume-down, volume-up. Working range: 10 meters, maximum 30 meters. Energy saving management. 10 Million Key switch life. Size: 40 x 17 x 3.35 cm, 86 keys+ 13 Internet/Multimedia Hot Keys Battery Type: 2 AA Batteries Compatible with Windows® ME/2000/XP or above. Certified for Windows Vista Certifications: CE, FCC 1 Year Manufacturers Warranty Features Built-in Track Ball & Mouse key, Scroll Wheel; Keyboard & Mouse in one. 2.4 GHz wireless with 8 channels. 360-degree navigation. USB Receiver Connector. Bidirectional RF frequency. Notebook keyboard module makes this perfect for handheld operation Two choices for mouse browsing: 800 dpi Optical Trackball & Scroll Wheel with mouse button

Posted on February 25, 2010 at 11:11 pm
http://www.wirelesshdadapter.com/2-4-ghz-rf-module/
http://www.wirelesshdadapter.com/2-4-ghz-rf-module/trackback/
Categorised under : Uncategorized
Tagged with : 2.4 ghz rf module for wireless communication , 2.4ghz , rf , sensors , wifi , zigbee