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TIA TSB-179

Terrestrial Land Mobile Radio – Antenna Systems - Total “Antenna System” Return Loss Measurements

Organization:
TIA - Telecommunications Industry Association
Year: 2010

Abstract: In the land mobile radio service there has historically been no clear relationship between the VSWR specifications of the individual components in the RF path and the expected resultant "system" VSWR at the bottom end of the transmission line. This makes it difficult, at best, for system operators to set a realistic set of measurement expectations for installers and technicians to use for checking completed installations
Various calculators and nomographs have been developed over the years to try to estimate what the expected system VSWR ought to be for the total RF path, but, at best they treat the combination of the individual component VSWR vectors as if they combine in a random fashion. This might be true most of the time, but there might be those instances where random vector combinations do not happen.
This Bulletin presents some of the nomographs and calculators that have been employed over the years and introduces an improved calculator that shows both typical and worst case vector summation. It also presents some theoretical reference material detailing how the VSWRs of specific components might combine. [1].
The use of manufacturer's names is not an endorsement, rather an acknowledgement to the source of the material in this Bulletin.
URI: http://yse.yabesh.ir/std;query=autho47037D83FCDC49A961598F1EFDEC9FCD/handle/yse/189613
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    TIA TSB-179

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contributor authorTIA - Telecommunications Industry Association
date accessioned2017-09-04T18:06:41Z
date available2017-09-04T18:06:41Z
date copyright40483
date issued2010
identifier otherGMZJDDAAAAAAAAAA.pdf
identifier urihttp://yse.yabesh.ir/std;query=autho47037D83FCDC49A961598F1EFDEC9FCD/handle/yse/189613
description abstractIn the land mobile radio service there has historically been no clear relationship between the VSWR specifications of the individual components in the RF path and the expected resultant "system" VSWR at the bottom end of the transmission line. This makes it difficult, at best, for system operators to set a realistic set of measurement expectations for installers and technicians to use for checking completed installations
Various calculators and nomographs have been developed over the years to try to estimate what the expected system VSWR ought to be for the total RF path, but, at best they treat the combination of the individual component VSWR vectors as if they combine in a random fashion. This might be true most of the time, but there might be those instances where random vector combinations do not happen.
This Bulletin presents some of the nomographs and calculators that have been employed over the years and introduces an improved calculator that shows both typical and worst case vector summation. It also presents some theoretical reference material detailing how the VSWRs of specific components might combine. [1].
The use of manufacturer's names is not an endorsement, rather an acknowledgement to the source of the material in this Bulletin.
languageEnglish
titleTIA TSB-179num
titleTerrestrial Land Mobile Radio – Antenna Systems - Total “Antenna System” Return Loss Measurementsen
typestandard
page26
statusActive
treeTIA - Telecommunications Industry Association:;2010
contenttypefulltext
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