A passive repeater or passive radio link deflection, is a reflective or sometimes refractive panel or other object that assists in closing a radio or microwave link, in places where an obstacle in the signal path blocks any direct, line of sight communication.[1]
A typical microwave repeater link setup, this one located near Salt Lake City, Utah, USA(removed in 2013)
Operation principle
Compared to a microwave radio relay station with active components, a passive repeater is far simpler and needs little maintenance and no on-site electric power.[2] It also does not require additional frequencies, unlike active repeater stations which use different transmit and receive frequencies to prevent feedback. The corresponding disadvantage is that without amplification the returned signal is significantly weaker, although in some configurations they can actually provide gain of 100 to 130 dB for u.h.f. and microwave radio-relay stations.[3]
Passive radio relay link deflection systems in the vertical level can be realized by receiving the signal with a parabolic antenna and leading it through a waveguide to a second parabolic antenna, where it is radiated. For passive microwave radio relay link deflections in the horizontal plane, flat surfaces of metallic material are used, arranged so that the angle of incoming beam corresponds to the angle of the outcoming signal. The resulting structure resembles a billboard.[4]
^Radio Mirrors for Communications, May 1969 Electronics World
^Radio Mirrors for Communications, May 1969 Electronics World
^Radio Mirrors for Communications, May 1969 Electronics World
^Radio Mirrors for Communications, May 1969 Electronics World
February 19, 2023
passive, repeater, passive, repeater, passive, radio, link, deflection, reflective, sometimes, refractive, panel, other, object, that, assists, closing, radio, microwave, link, places, where, obstacle, signal, path, blocks, direct, line, sight, communication, . A passive repeater or passive radio link deflection is a reflective or sometimes refractive panel or other object that assists in closing a radio or microwave link in places where an obstacle in the signal path blocks any direct line of sight communication 1 A typical microwave repeater link setup this one located near Salt Lake City Utah USA removed in 2013 Operation principle Compared to a microwave radio relay station with active components a passive repeater is far simpler and needs little maintenance and no on site electric power 2 It also does not require additional frequencies unlike active repeater stations which use different transmit and receive frequencies to prevent feedback The corresponding disadvantage is that without amplification the returned signal is significantly weaker although in some configurations they can actually provide gain of 100 to 130 dB for u h f and microwave radio relay stations 3 Passive radio relay link deflection systems in the vertical level can be realized by receiving the signal with a parabolic antenna and leading it through a waveguide to a second parabolic antenna where it is radiated For passive microwave radio relay link deflections in the horizontal plane flat surfaces of metallic material are used arranged so that the angle of incoming beam corresponds to the angle of the outcoming signal The resulting structure resembles a billboard 4 Similar systems are used also occasionally for TV relay transmitters or as tunnel transmitters In these cases a Yagi antenna receives the transmitted signal and supplies it by way of a coaxial cable to a second Yagi antenna Photos of microwave repeaters EditSee also external links for photos of variety of other passive repeaters Microwave repeaters on Black Hill Hong Kong Closer view of one of the Microwave repeaters on Black Hill Hong Kong Microwave repeater on a hill in Nagano JapanExternal links EditRadio Mirrors for Communications May 1969 Electronics World Passive Repeater Engineering Microflect Co Inc 1989 Microwave passive repeater in MarylandReferences Edit Radio Mirrors for Communications May 1969 Electronics World Radio Mirrors for Communications May 1969 Electronics World Radio Mirrors for Communications May 1969 Electronics World Radio Mirrors for Communications May 1969 Electronics World Retrieved from https en wikipedia org w index php title Passive repeater amp oldid 1051304753, wikipedia, wiki, book, books, library,
