Communications receiver - wikipedia Communications receiver The National HRO, a classic communications receiver c. 1936. A communications receiver is a type of radio receiver used as a component of a radio communication link. This is in contrast to a broadcast receiver which is used to receive radio broadcasts. The difference between the two is that broadcast receivers only receive broadcast bands, such as the medium wave and / or longwave AM broadcast bands and the VHF FM broadcast band, while a communication receiver receives a wider part of the radio spectrum not used for broadcasting, that includes amateur, military, aircraft, marine, and other bands. They are often used with a radio transmitter as part of a two way radio link for shortwave radio or amateur radio communication, although they are also used for shortwave listening. Contents 1 Features 2 Photo gallery 3 See also 4 References 5 Further reading Features Commercial communications receivers are characterized by high stability and reliability of performance, and are generally adapted for remote control and monitoring. For marketing purposes, many hobby - type receivers are advertised as a `` communications receivers '' although none are suited for heavy - duty, reliable 24 - hour use as the primary form of communication for an isolated station. Typically, a communications receiver is of the superheterodyne type in double, triple or, more rarely, quad conversion. It features multiple RF and IF amplification stages and may have at least one IF stage that is crystal controlled. It usually has a BFO and a product detector for SSB and CW reception. The frequency coverage of receivers of this type is typically in the range of 500 kHz to 30 MHz. Communication receivers are suited for operation near powerful transmitting facilities and so must have good internal shielding, and effective front - end filtering. They have design features to provide high selectivity and stability. Rejection of unwanted signals ( images, intermodulation products ) will typically be much greater than a consumer - type general coverage or broadcast receiver. The front panel controls are typically more comprehensive than those on a broadcasting receiver. Usual features include : signal strength meter ; RF gain control ; AVC / AGC adjustments ; band switching or preselector switching ; selectable bandwidth filters ; BFO tuning ; and audio limiters or attenuators. Precise, calibrated, analog tuning and display dials are used, with a separate bandspread control to allow selective tuning of signals close in frequency. In more recent units, electronic digital frequency displays are provided. In communication receivers, the decorative wooden cabinets typical of early broadcast receivers were replaced with utilitarian metal cabinets to provide electromagnetic shielding and mechanical ruggedness. Communications receivers as an identifiable product type originated in 1933. The older generation of tube - based communications receivers are affectionately known as boatanchors for their large size and weight. Such receivers include the Collins R - 390 and R - 390A, the RCA AR - 88, the Racal RA - 17L and the Marconi Electra. However, even modern solid - state receivers can be very large and heavy, such as the Plessey PR2250, the Redifon R551 or the Rohde & Schwarz EK070 / D2 - 80. Photo gallery BC - 224 - D, U.S. military variant of BC - 348, c. 1940s Hallicrafters SX - 28 Super Skyrider receiver, c. 1940s Eddystone Ec. 10, c. 1950s Drake 2B, c. 1960s Collins Radio R - 390A, 1955 Hallicrafters SX - 115, c. 1960s Hallicrafters SX - 117, c. 1960s Drake R4B, c. 1971 Icom IC R - 71R, c. 1980s AKD Target HF - 4E, c. 1980s Icom RC - 9500, 2000s Perseus SDR receiver, 2009 See also Amateur radio Scanner Shortwave radio receiver Shortwave listening Shortwave radio Wadley Loop References ^ Jump up to : Jerome S. Berg, On the Short Waves, 1923 - 1945 : Broadcast Listening in the Pioneer Days of Radio, McFarland, 2007 ; ISBN 078643029X page 121 Jump up ^ Shortwave Receivers Past and Present : Communications Receivers, 1942 - 1997, by Fred Osterman. Published by Universal Radio Research, 1998. ISBN 1 - 882123 - 07 - 7, ISBN 978 - 1 - 882123 - 07 - 0 Further reading Wikimedia Commons has media related to Communications receivers. Osterman, Fred ( 1998 ). Shortwave Receivers Past & Present : Communications Receivers 1942 - 1997. Universal Radio Research, Reynoldsburg ( USA ). Ulrich L. Rohde, Jerry Whitaker. Communications Receivers, Third Edition. McGraw Hill, New York, NY, 2001. ISBN 0 - 07 - 136121 - 9. Telecommunications History Beacon Broadcasting Cable protection system Cable TV Communications satellite Computer network Drums Electrical telegraph Fax Heliographs Hydraulic telegraph Internet Mass media Mobile phone Optical telecommunication Optical telegraphy Pager Photophone Prepaid mobile phone Radio Radiotelephone Satellite communications Semaphore Smartphone Smoke signals Telecommunications history Telautograph Telegraphy Teleprinter ( teletype ) Telephone The Telephone Cases Television Timeline of communication technology Undersea telegraph line Videoconferencing Videophone Videotelephony Whistled language Pioneers Edwin Howard Armstrong John Logie Baird Paul Baran Alexander Graham Bell Tim Berners - Lee Jagadish Chandra Bose Vint Cerf Claude Chappe Donald Davies Lee de Forest Philo Farnsworth Reginald Fessenden Elisha Gray Erna Schneider Hoover Charles K. Kao Hedy Lamarr Innocenzo Manzetti Guglielmo Marconi Antonio Meucci Radia Perlman Alexander Stepanovich Popov Johann Philipp Reis Nikola Tesla Camille Tissot Alfred Vail Charles Wheatstone Vladimir K. Zworykin Transmission media Coaxial cable Free - space optical communication Molecular communication Optical fiber Radio waves Transmission line Network topology and switching Links Nodes Terminal node Network switching ( circuit packet ) Telephone exchange Multiplexing Space - division Frequency - division Time - division Polarization - division Orbital angular - momentum Code - division Networks ARPANET BITNET Cellular network Computer CYCLADES Ethernet FidoNet Internet ISDN LAN Mobile NGN NPL network Public Switched Telephone Radio Telecommunications equipment Television Telex WAN Wireless World Wide Web Portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=Communications_receiver&oldid=807883438 '' Categories : Receiver ( radio ) Types of radios Talk Contents About Wikipedia Simple English Suomi Edit links This page was last edited on 30 October 2017, at 17 : 03. 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Question: what is the definition of receiver in communication
Answer: a type of radio receiver used as a component of a radio communication link