Bird Electronic Corporation - 3128 - Other
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Equipment:
3128
Date:
1994
Category:
Group:
Sub Group:
Information
PURPOSE AND FUNCTION
The Bird WATTCHER® RF monitor is a continuous service
equipment designed for the protection and performance
observation of radio frequency transmission systems. The
Control and Alarm System operates with high reliability
electromechanical components working on simple dc and low
voltage ac circuits without the use of vacuum tubes or high
impedance balanced circuitry. It is designed for use on RF
power levels from 1 Watt to 250 kilowatt, and a frequency
range from 0.45 to 2400 MHz. In use, a two-element THRULINE®
line section will be required. The THRU LI NE® RF line
section will depend upon the type of coaxial transmission
line being used in the system. Two plug-in elements are
selected to cover the power levels and frequency ranges used.
The function of the element is to detect (sense) the forward
or reflected RF power in the line section at any give time.
The direction in which the "arrow", on the Element cap, is
oriented indicates the direction in which it is sensing the
RF power flow in the system. The dc outputs of these
detectors are fed respectively to the two panel meters,
which indicate directly the forward and the reverse RF
energies (incident or reflected power). The reflected power
meter has a relay contact incorporated into it, and if the
set level is reached, visual and audible alarms will
function; and when so wired, external warning devices and
transmitter disabling controls can be activated. The monitor
is provided with a selector that can be set for operation in
one of the two modes as described below.
1.2 MODEL DIFFERENCES
The Model
3126 RF Power Monitor/Alarm is identical to the
Model
3127 except the Model
3126 has a forward meter with a
15/30/60 kilowatt scale (P/N 2150-090). The reflected meter
has a 1.5/3.0/6.0 kilowatt scale (P/N 2150-091).
Service and user manual
Manual type:
Service and user manual
Pages:
21
Size:
2.9 MB
Language:
english
Revision:
Manual-ID:
920-3126/27/28
Date:
January 1994
Quality:
Scanned document, all readable.
Upload date:
Aug. 27, 2017
MD5:
0b0ac279-c88c-9c4e-53c1-3d7402fc472f
Downloads:
892