Bird Technologies 4314B - Manual (Page 24)

12
Plug-In Element Selection and Insertion
The elements determine the power range to be read on the meter scale. The
major markings (50 W, 100 W, etc.) are the full scale power value for that ele-
ment. Elements are also marked for frequency range. The transmitter frequency
must be within the band of the element used.
•
RF power measurements are made with the insertion of a Plug-In Ele-
ment. Insert the element into the line section’s receptacle.
•
Forward power is indicated when the arrow on the element points in
the direction of power flow; from transmitter to load. Reflected power
measurements are made with the element rotated 180 and the arrow
pointing towards the transmitter.
Note: The element must be rotated fully when power measurements
are being made.
The index pin protruding from the element’s body should rest against the stop
on the line section in both the forward and reflected position. The small catch in
the lower left hand corner of the casting face should press down on the shoulder
of the Plug-In Element. This will keep the Plug-In Element in proper alignment
and insure good contact with the dc pickup, the lower edge of the element and
the line section body.
Measurements
CW Power Measurements
1. Set the wattmeter controls to the ON and CW modes
2. Read the appropriate meter scale corresponding to the element full-scale
value.
Peak Power Measurements
1. Set the ON/BATTERY switch to the BATTERY mode.
Note: If the pointer of the meter indicates below the battery test
zone, the batteries must be replaced. See “Replacing the Batteries” on
page 24.
2. Set CW/PEAK switch to PEAK mode.
3. Read the appropriate meter scale corresponding to the element full-scale
value.