Bird Technologies 4331 - Manual (Page 39)

Normal Operation
1. Insert the appropriate element in the socket of the line sec-
tion.
2. Rotate the element so that the “arrow” on the nameplate
is pointed away from the RF source for forward power
and towards the source for reflected power.
3. Turn on the RF source.
4. Read the power level indicated on the appropriate meter
scale.
In cases where readings are being made when the meter unit is connected
to an auxiliary RF line section, always remove any measuring element from
the unused RF line section. Otherwise, the dc circuit will be unbalanced or
shorted according to the “arrow” position of the other element, causing
inaccurate or no indication on the meter.
For the convenience of users, a set of VSWR conversion nomographs is
included in this instruction book. With these charts, VSWR may be directly
determined from forward and reflected power values read from the Thruline
Wattmeter.
When a Model 43 is used to match a load to a transmitter and a good match
is obtained, removing the instrument will not cause any change in the
To Load To Transmitter
To Load To Transmitter
Forward Power Measurement
Reflected Power Measurement
Figure
10
Direction of
Element
Operating Instructions
25