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Topic: Rf


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In the News (Tue 23 Jul 19)

  
  What is radio frequency? - a definition from Whatis.com - see also: RF
When an RF current is supplied to an antenna, itgives rise to an electromagneticfield that propagates through space.
This field is sometimescalled an RF field; in less technical jargon it is a "radiowave." Any RF field has a wavelength that is inverselyproportional to the frequency.
The frequencyof an RF signal is inversely proportional to the wavelengthof the EM field to which it corresponds.
searchnetworking.techtarget.com /sDefinition/0,,sid7_gci214263,00.html   (548 words)

  
  RF - Wikipedia, the free encyclopedia
RF connectors, electrical connectors designed to work at radio frequencies.
RF (practical joke) as practiced at California Institute of Technology.
Paper chromatography Rf value is a calculation method in paper chromatography.
en.wikipedia.org /wiki/RF   (155 words)

  
 RF Connectors   (Site not responding. Last check: )
RF Connector designed to meet the requirements of DIN 47295 and CECC 22240 with screw, or push pull, couplings to ensure mating integrity.
RF connector used in high speed digital communication systems.
RF connector used in high speed digital tele communication systems.
www.ittcannon.com /products/products.asp?pid=1012&cf=pl   (294 words)

  
 RF Field Strength Meter
The RF Field Strength Meter is directional and it detects only the component of the electric field which has the same polarization as the long axis of the meter.
When measuring an RF signal of unknown frequency, you may notice that the reading is different when the Bandwidth switch is set to "Wide" vs. "Narrow".
Although most commercial RF transmitters radiate with a vertical antenna and thus a vertical electric field (so you can hold the meter vertically to measure the full power density), some RF radiation also has some horizontal component, due to reflections or transmitters that have antennas not pointed vertical.
www.trifield.com /rf_meter.htm   (1145 words)

  
 Rheumatoid Factor: The Test
If you have a positive RF test result but do not have RA or Sjögren’s syndrome, there may be another reason, such as endocarditis; systemic lupus erythematosus (lupus); tuberculosis; syphilis; sarcoidosis; cancer; viral infection; or disease of the liver, lung, or kidney.
A negative RF test result means that you do not have RA, or it is too early in your disease progression to detect RF, or possibly you are in a remission phase.
The RF test has a high false positive rate, and the result must be used along with the patient’s symptoms and history to make a diagnosis of RA, Sjögren’s syndrome, or another condition.
www.labtestsonline.org /understanding/analytes/rheumatoid/test.html   (512 words)

  
 MedlinePlus Medical Encyclopedia: Rheumatoid factor
This is a test that measures the presence and level of rheumatoid factor (RF) in the blood.
The RF test is used mainly in the diagnosis of rheumatoid arthritis, although the test result can be positive in many other diseases as well as in healthy people.
RF is an antibody that attaches to a substance in the body called immunoglobulin G (IgG), forming a molecule known as an immune complex.
www.nlm.nih.gov /medlineplus/ency/article/003548.htm   (607 words)

  
 Riksidrottsförbundet
RF har nu fördelat bidraget till idrottsföreningars anläggningar.
Ansökningar för pågående period ska vara RF tillhanda senast 30 november 2007.
RF har via Idrottslyftet tilldelats 500 miljoner kronor för satsningar på barn- och ungdomsidrott.
www.rf.se   (339 words)

  
 RF Globalnet: Digital Marketplace for the RF/microwave, and wireless industry
RF Globalnet is the leading online trade publication for the RF/microwave design industry, serving the needs of engineering professionals since 1996.
Specific absorption rate (SAR) is a measure of the amount of RF energy absorbed by the body when using a wireless device.
The FCC and other regulatory bodies have adopted limits for safe exposure to RF energy that are expressed as SAR in W/kg.
www.rfglobalnet.com   (1243 words)

  
 Amkor: RF Design / Wireless Design Services
Cost, size and RF performance are strongly influenced by device technologies, interconnect methodologies, substrate materials and construction, metallization schemes, embedded and discrete passives, shielding and encapsulation techniques.
Successful RF design requires not only an understanding of all of these, but also RF system and schematic knowledge, substrate design and characterization capabilities, and the skills to present and make engineering tradeoffs.
From RF Power Amplifiers to full 802.11 modems, Amkor is committed to enabling our customers through our interactive RF Design and Applications Services.
www.amkor.com /services/test/RF_design_services.cfm   (248 words)

  
 RF Cafe - RF Microwave Wireless High Frequency Application Note & Technical Paper Websites
RF Directional Couplers and 3dB Hybrids Overview, by M/A-COM.
A collection of RF oscillator design notes, including a fresh look at the correct application of Leeson's equation as it applies to feedback.
RF Prototyping Techniques, by Christian Bourde, Jeff Fuller and Steve Long, University of San Diego, CA.
www.rfcafe.com /references/app_note_links.htm   (2317 words)

  
 ARRLWeb: RF Exposure Regulations News
Supplement B covers definitions of RF radiation and discusses the FCC exposure guidelines and their applications, methods of predicting human exposure, estimating compliance distances, and controlling exposure to RF fields.
The new rules were effective when the original Report and Order was released on August 1, 1996, with a transition period for stations to come into compliance set to January 1, 1997, however the FCC granted a request by the ARRL to extend the transition date until January 1, 1998.
In response to a petition from the ARRL, the FCC extended the transition period and agreed that the required questions for the Amateur Radio examinations for some classes of license could be updated in their normal cycles.
www.arrl.org /news/rfsafety   (1686 words)

  
 RF Design Magazine | Wireless Communication and Radio Frequency Circuit Design for RF Engineers
RF receiver ICs are optimized for low-power, low-cost applications
RF ICs MLX71120 and MLX71121 are two new members of Melexis’ highly integrated RF receiver family.
Nov 8, 2007 12:14 PM The Femto Forum, which was launched in July this year to expedite the standardization of femtocells, has extended its membership to include major operators and equipment vendors which are already actively participating in the Forum’s working groups.
www.rfdesign.com   (777 words)

  
 What is RF? - A Word Definition From the Webopedia Computer Dictionary
When an RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space.
RF interference will continue to plague current and future 802.11b implementations unless an adequate site survey is conducted - preferably prior to actual network installation.
The construction of a facility and silent sources of RF interference impact the propagation of radio waves, often in odd ways.
www.webopedia.com /quick_ref/RF.html   (287 words)

  
 RF Parts Company™ Amateur Radio Catalog
Copyright ©1998-2007 RF Parts Company • All Rights Reserved
Information may not be duplicated, re-written, broadcast or re-transmitted
in any form without the express written consent of RF Parts Company.
www.rfparts.com   (82 words)

  
 Radio frequency - Wikipedia, the free encyclopedia
Rough plot of Earth's atmospheric transmittance (or opacity) to various wavelengths of electromagnetic radiation, including radio waves.
Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna.
Such frequencies account for the following parts of the spectrum shown in the table below.
en.wikipedia.org /wiki/Radio_frequency   (345 words)

  
 OET -- Radio Frequency Safety
The FCC is required by the National Environmental Policy Act of 1969 to evaluate the effect of emissions from FCC-regulated transmitters on the quality of the human environment.
The SAR is a value that corresponds to the relative amount of RF energy absorbed in the head of a user of a wireless handset.
This model has been found to be very useful for most applications when it is desired to predict RF field levels on the ground near simple FM radio installations.
www.fcc.gov /oet/rfsafety   (664 words)

  
 RFI
RF Industries (NASDAQ RFIL) is a leading provider of wired and wireless solutions for the telecom and biomedical markets.
Our mission is to develop productive, competitive business enterprises by promoting entrepreneurial employee ownership and improving corporate performance.
RF Industries, 7610 Miramar Road, San Diego, CA 92126, (800) 233-1728, (858) 549-6340, fax: (858) 549-6345, rfi@rfindustries.com
www.rfindustries.com   (73 words)

  
 RF Cafe: Resources for Radio, Radar, RF, Microwave, & Wireless Engineering
If you are kind enough to consider providing a reciprocal link from your website to RF Cafe, then here are a few pre-prepared formats that you might consider.
RF Cafe has become the the de facto place to visit for questions, answers, and sharing of interview experiences with Qualcomm.
RF Cafe T-Shirt Winner "maasseel" Displays His Prize
www.rfcafe.com   (917 words)

  
 The MathWorks - RF Blockset - Design and simulate the behavior of RF systems and components in a wireless system
RF Blockset extends Simulink with a library of blocks to model the behavior of radio frequency (RF) filters, transmission lines, amplifiers, and mixers.
To design and analyze RF components in MATLAB, see also RF Toolbox.
RF Toolbox is one of the product requirements of RF Blockset.
www.mathworks.com /products/rfblockset   (229 words)

  
 Amphenol RF
Amphenol is the world leader in the design, manufacture and supply of RF interconnect systems for the automotive, broadband, instrumentation, internet, military/aerospace and wireless infrastructure markets.
With the combination of our global footprint and experience extending over a half-century, Amphenol is your RF Global Solutions Provider for the 21st Century.
Amphenol RF introduces the AFI connector interface as a solution for board-to-board RF applications, especially for the military and broadband marketplaces.
www.amphenolrf.com   (103 words)

  
 Homebrew RF Test Equipment and Software
These devices develop a DC potential with respect to ground which is proportional to the degree of unbalance in the arms of the bridge circuit.
That is, measure the DC output voltage, at the operating frequency, of a unterminated bridge.
These are useful for directly connecting the output of a high power RF amplifier into a spectrum analyzer, frequency counter or other piece of test equipment (additional attenuation maybe required!).
www.qsl.net /n9zia/wireless/appendixF.html   (2458 words)

  
 RF Amplifiers . Com - RF/Microwave amplifiers,RF amplifiers,and Microwave,Cellular,wireless,amplifiers,- HD ...
We have been in the RF Microwave amplifier business since 1976 and offer an extensive range of both commercial and Military rf and microwave amplifiers.
Single Carrier, Multi-Carrier, Laboratory RF Amplifiers, Multi octave, Narrow band, and Microwave Amplifiers for both commercial and Military applications.
Wideband And Ultra Wideband RF And Microwave Amplifiers
www.rfamplifiers.com   (560 words)

  
 Microwave design articles, applications, and high-frequency design techniques for microwave and wireless engineer
The MIMO RF test system consists of the company's model 2920 vector signal generat...
Coaxial Dynamics has relesed a new 24-page instrumentation short-form catalog with more than 500 products for RF power measurement systems.
The short-form catalog features capabilities on analog and digital RF power measurements at levels from 100 mW...
www.mwrf.com   (860 words)

  
 Pulse RF and Wireless Products
Pulse’s broad range of RF and wireless products give you design flexibility without compromising performance and reliability.
We understand what it takes to engineer, manufacture and deliver the innovative parts needed for today’s high-frequency network and communication devices.
Browse below for detailed information on our RF and Wireless product categories or contact us if you’d like help with a custom solution.
www.pulseeng.com /products/default.aspx?Product_Group=RF_and_Wireless   (163 words)

  
 RF
Offering a broad portfolio of RF products, Freescale Semiconductor primarily serves the wireless infrastructure, wireless subscriber, general purpose amplifier, broadcast and industrial markets.
Freescale pioneered RF technology and continues to be the leader in the field by providing the quality, reliability and consistency that is associated with our RF products.
Freescale is committed to developing new products and expanding our product offerings to meet the increasing demands of ISM band and personal communication systems, including cellular phone, broadband data, WiMAX, TV broadcast, land mobile and various industrial applications.
www.freescale.com /webapp/sps/site/homepage.jsp?nodeId=0106B9   (141 words)

  
 RF ONLINE > NEWS   (Site not responding. Last check: )
We’ve just launched fan submission webpages for wallpapers, screenshots and artwork on the official RF Online website — meaning fans and players of RF Online can upload their own work to the official website for other fans and players to download.
For a limited time only, RF Online is offering enhanced chip drops with many ‘uber’ items available, including; Talics, upgrading materials, Elementals, strong intense weapons and much, much more.
MMORPG "RF Online" is a trademark of CCR Inc. Published and distributed by The Codemasters Software Company Limited ("Codemasters").
www.codemasters.com /rfonline/news.php   (655 words)

  
 RF Solutions & Wireless Communications Technology: RFMD
RFMD(R) plans to expand manufacturing capacity to support growth expectations in Cellular and Multi-Market product groups.
11/08/2007   RF Micro Devices to Host Analyst Day on Thursday, November 15, 2007 more >>
10/16/2007   RF Micro Devices Earnings Conference Call to Be Webcast October 23, 2007 more >>
www.rfmd.com   (114 words)

  
 RF Online for PC - RF Online PC Game - RF Online Computer Game
RF Online has a compelling player-versus-player component, but the rest of the game is tedious and uninspired.
RF Online (Rising Force Online) Official Trailer 1
RF Online (Rising Force Online) Developer Interview 1
www.gamespot.com /pc/rpg/rfonline/index.html   (320 words)

  
 ClearStation : Details : RF
ClearStation : Details : RF Real Time Market Diary
Financial Realty to buy 112 properties (AFR, RF)...
Fast break to 40, not out of question, if we get anticipated...
clearstation.etrade.com /cgi-bin/details?Symbol=RF   (99 words)

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