Bird Technologies 6151A - Manual (Page 18)

Measuring
Transmitter Power
WARNING
Do not attempt to operate the Termaline Wattmeter for prolonged periods at higher than
read load levels. Damage to the equipment and injury to operator may result.
The meter indicates the power dissipated in the load portion of the instrument.
Losses introduced by the cable between the transmitter and the wattmeter, if
significant, must be added to the power, indicated by the Model 6151A Wattmeter.
During the process of switching from the wattmeter back to the antenna, it may
become necessary to retune the transmitter slightly due to the difference in VSWR
between the wattmeter termination and the transmitter’s antenna.
Use As Dummy
Antenna
The Model 6151A may be used, without the meter and Plug-In Element, as a 50
ohm coaxial termination load for transmitters with a power output up to 100 watts
from dc to 2.3 GHz.
To protect the meter when using as a dummy antenna, the meter can be disconnected
at the dc plug. Also turn the element so that the arrow on the identification plate
points up i.e. at 90 to direction of power flow.
The load portion will accept an overload of RF power for short periods of time as
long as sufficient time between overloading is allowed for cooling.
Bird Model 6151A Termaline Wattmeter
8