Bird Technologies 8141 - Manual (Page 17)

Chapter 4
Operating Instructions
Start-up
Connect the Models 8141 and 8141-010 Termaline Load Re-
sistor to the transmitting equipment under test with 50
ohm coaxial cable such as RG-213/U or equal, equipped with
a Male N type plug (UG-21E/U or equal) which mates with
the RF input connector of the load. After the transmitter
has been connected to the load, proceed according to the
transmitter manufacturer’s instruction.
Due to the difference in VSWR between the dummy load
and the transmitter’s antenna, readjustment of the trans-
mitter may be required when returning to the original an-
tenna.
CAUTION
Do not operate this equipment over the rated 250 watts
continuously. Damage to the resistive element will
result.
The unit will sustain an intermittent input of 300 W maxi-
mum for up to ten minutes with half-hour off intervals be-
tween power applications.
Normal
Operation
The loads will dissipate 250W of RF power safely and con-
tinuously without an operator in attendance.
As stated previously, the load can be overloaded to 300W of
RF power for a maximum of ten minutes at a time with an
interval of at least a half-hour in between to permit the load
to cool off. Because of the additional heat that must be given
off by the cooling fins under these conditions, touch the load
with caution to avoid the possibility of painful burns.
Shutdown
The only way to turn off the equipment is to cut off power
from the RF generator. Allow sufficient time for the load to
cool down after removing RF power before handling it.
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