Technology — page 75 of 206

20,531 terms including subtopics (0 terms filed directly here)

Subtopics

Technology terms

  1. frequency lock The condition in which a frequency-correcting feedback loop maintains control of an oscillator within the limits of one cycle.
  2. Frequency Management The act of allocating frequencies, or bandwidths to a telecommunications system, necessary to minimize the potential interference between…
  3. Frequency Modulation (FM) Modulation in which the instantaneous frequency of a sine wave carrier is caused to depart from the center frequency by an amount proportional to the…
  4. frequency of optimum traffic (FOT) Synonym FOT.
  5. frequency of optimum transmission (FOT) See FOT.
  6. frequency offset The difference between the frequency of a source and a reference frequency.
  7. frequency prediction A prediction of the maximum usable frequency (MUF), the optimum traffic frequency, and the lowest usable frequency (LUF) for transmission between two…
  8. frequency range A continuous range or spectrum of frequencies that extends from one limiting frequency to another.
  9. frequency response See insertion-loss-vs.-frequency characteristic.
  10. frequency response curve A plot of the gain or attenuation of a device, such as an amplifier or a filter, as a function of frequency.
  11. frequency scanning Conducting a search for signals over a band or range of frequencies by means of a manually or automatically tuned receiver. Note: The tuning rate, i.e.
  12. frequency sharing The assignment to or use of the same radio frequency by two or more stations that are separated geographically or that use the frequency at different…
  13. frequency shift Any change in frequency. 2. Any change in the frequency of a radio transmitter or oscillator.
  14. frequency source See frequency standard.
  15. frequency spectrum See electromagnetic spectrum.
  16. frequency spectrum congestion The situation that occurs when many stations transmit simultaneously using frequencies that are close together, i.e.
  17. frequency stability The degree to which variations of the frequency of an oscillator deviate from the mean frequency over a specified period of time.
  18. frequency standard A stable oscillator used for frequency calibration or reference. Note 1: A frequency standard generates a fundamental frequency with a high degree of…
  19. frequency synthesizer A device that produces frequencies that are phase coherent with a reference frequency.
  20. frequency tolerance The maximum permissible departure by the center frequency of the frequency band occupied by an emission from the assigned frequency, or by the…
  21. frequency translation The transfer of signals occupying a specified frequency band, such as a channel or group of channels, from one portion of the frequency spectrum to…
  22. frequency-analysis compaction Data compaction accomplished by using an expression composed of a number of different frequencies of different magnitudes to represent a particular curve.
  23. frequency-change signaling A signaling method in which one or more discrete frequencies correspond to each desired significant condition of a code.
  24. frequency-derived channel A channel derived by dividing an allocated or available bandwidth over a medium into two or more portions, each usable separately.
  25. frequency-division multiple access (FDMA) The use of frequency division to provide multiple and simultaneous transmissions to a single transponder.
  26. frequency-division multiplexing (FDM) The deriving of two or more simultaneous, continuous channels from a transmission medium by assigning a separate portion of the available frequency…
  27. frequency-exchange signaling Frequency-change signaling in which the change from one significant condition to another is accompanied by decay in amplitude of one or more frequencies…
  28. frequency-hopping spread spectrum A signal structuring technique employing automatic switching of the transmitted frequency.
  29. frequency-shift keying (FSK) Frequency modulation in which the modulating signal shifts the output frequency between predetermined values.
  30. frequency-shift modulation Synonym frequency-shift keying.
  31. frequency-shift signaling Synonym frequency-shift keying.
  32. frequency-shift telegraphy Telegraphy by frequency modulation in which the telegraph signal shifts the frequency of the carrier between predetermined values. [NTIA] [RR]
  33. frequently asked questions See FAQ file.
  34. Fresh The term that Google uses to refer to frequently changing home pages. When Googlebot ascertains that a given home page is changing frequently, Googlebot…
  35. Fresh Content Content which is dynamic in nature and gives people a reason to keep paying attention to your website.
  36. Freshness The "age" of the document compared to the time of query.
  37. Freshness boosting Enhances relevancy by boosting documents based on their relative age - that is, compared to the time of query.
  38. Fresnel diffraction pattern Synonym near-field diffraction pattern.
  39. Fresnel reflection In optics, the reflection of a portion of incident light at a discrete interface between two media having different refractive indices.
  40. Fresnel zone In radio communications, one of a (theoretically infinite) number of a concentric ellipsoids of revolution which define volumes in the radiation pattern…
  41. FRG Federal Republic of Germany.
  42. FRGC (Face Recognition Grand Challenge) A face recognition development program sponsored by the U.S. Government from 2003-2005. For more information visit www.frvt.org/FRGC. See also FERET, FRVT.
  43. Friction Ridge The ridges present on the skin of the fingers and toes, and on the palms and soles of the feet, which make contact with an incident surface under normal…
  44. FRN Force Requirement Number.
  45. FROD Functionally Related Observable Differences.
  46. FROG Free Rocket Over Ground.
  47. from-node Of an arc's two endpoints, the one first digitized.
  48. front-end noise temperature A measure of the thermal noise generated in the first stage of a receiver.
  49. front-end processor (FEP) A programmed-logic or stored-program device that interfaces data communication equipment with an input/output bus or memory of a data processing computer.
  50. front-end security filter 1. [A] security filter logically separated from the remainder of an information system (IS) to protect system integrity.
  51. Front-end/back-end An Exchange 2000 configuration in which clients access a bank of protocol servers (the front-end) for collaboration information, and these in turn…
  52. front-end/back-end architecture An Exchange configuration where clients access a bank of protocol servers (the front-end) for collaboration information, and then these servers…
  53. front-to-back ratio 1. Of an antenna, the gain in a specified direction, i.e., azimuth, usually that of maximum gain, compared to the gain in a direction 180° from the…
  54. FrontPage Server Extensions A set of programs and scripts that support authoring in Microsoft Office FrontPage and extend the functionality of a Web server.
  55. frozen records A suspension of the records destruction process because of special circumstances such as an audit, court order, or investigation See also destruction hold…
  56. FRP Full-Rate Production.
  57. FRS Federal Reserve System.
  58. FRS (File Replication Service) A multimaster replication service that is used replicate files and folders between servers. [Exchange 2007]
  59. FRU Field-Replaceable Unit. Any hardware unit that can be replaced at the customer site.
  60. FRVT (Face Recognition Vendor Test) A series of large-scale independent technology evaluations of face recognition systems. The evaluations have occurred in 2000, 2002, and 2005.
  61. FS - U.S. Forest Service, feasibility study, factor of safety.
  62. FS 3 Future Strategic Strategy Study.
  63. FS&E Facility Siting and Environment (MILCON term). 113
  64. FSAF Future Surface-to-Air [Missile] Family.
  65. FSC (1) Fire Solution Computer. (2) Fire Support Coordination.
  66. FSCATT Fire Support CATT [for Weapons] (US Army term).
  67. FSCL Fire Support Coordination Line.
  68. FSD OBSOLETE. Full Scale Development Phase. See EMD.
  69. FSDPSK Abbreviation for filtered symmetric differential phase-shift keying.
  70. FSE Fire Support Element.
  71. FSK Abbreviation for frequency-shift keying.
  72. FSM Firmware Support Manual.
  73. FSP Facility Security Plan.
  74. FSS Fixed Satellite Service.
  75. FSST Forward Space Support in-Theater.
  76. FST Flight System Testbed .
  77. FSU Former Soviet Union.
  78. FSU Republics Former Soviet Union Republics.
  79. FT Feet (or foot)
  80. FTAM Abbreviation for file transfer, access, and management.
  81. FTC Federal Trade Commission.
  82. FTD OBSOLETE. Foreign Technology Division (USAF), Wright-Patterson AFB, OH. See NAIC.
  83. FTI Fixed Target Indicator
  84. FTLS Formal Top-Level Specification.
  85. FTP File Transfer Protocol (ADP/Internet term).
  86. FTP (File Transfer Protocol) An Internet protocol that enables the transfer of files between computers over a network or the Internet.
  87. FTP archive A collection of files that are available by using file transfer protocol (FTP). Synonyms file archive, file site.
  88. FTP mail A method of accessing and retrieving FTP-based files via e-mail.
  89. FTR Flight Test Round.
  90. FTS (1) Flight Test Summary (2) Federal Telephone Service
  91. FTS 2000 Federal Telecommunications System 2000.
  92. FTS2000 Abbreviation for Federal Telecommunications System 2000. The designation for a defunct Federal telecommunications contract replaced by the contract…
  93. FTS2001 Abbreviation for Federal Telecommunications System. A contract to provide a consolidated telecommunications capability to support Federal agencies with…
  94. FTV (1) Functional Technology Validation. (2) Flight Test Vehicle.
  95. FTX Field Training Exercise.
  96. FU Fire Unit (PATRIOT).
  97. FUE First Unit Equipped. 114
  98. full access token An access token with the maximum privileges authorized for the account. Used by User Account Control (UAC).
  99. full carrier A carrier that is transmitted without reduction in power, i.e., a carrier that is of sufficient level to demodulate the sideband(s).
  100. full carrier single-sideband emission A single-sideband emission without reduction of the carrier. [NTIA] [RR]