TIA TSB-179:2010

$29.25

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

Published By	Publication Date	Number of Pages
TIA	2010	26

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Description

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.

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