Bird Technologies 3171B020 - Manual (Page 14)

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Purpose and Function
The Model 3170B Series High Speed Wattcher unit is a two channel power monitoring system for use in 50 ohm
coaxial transmission lines. Adjustable set points allow user to preset maximum reflected and minimum forward
power trip points.
Activated audible/visual alarms indicate an erroneous condition present on the transmission line. Corrective action
can then be followed to either protect transmission equipment or restore transmission line to operational character-
istics. This power monitoring capability is accomplished through the use of a dual port 50 ohm insertion type line
section. Each port must contain a standard Bird Electronic Corporation plug-in element. Usually elements with a ten
to one ratio is recommended for the forward and reverse power levels.
The Wattcher monitoring system also provides additional terminal connections for user specific applications. For
details and wiring information, see “User Applications and Wiring” on page 31.