Bird Technologies 8320 - Manual (Page 19)

Chapter 4
Operating Instructions
Use And
Function Of
Controls
These attenuators, being passive devices, have no indicators
or operating controls.
Initial
Adjustments
No initial adjustments are necessary other than to connect
the attenuator to the RF source and load by means of coax-
ial cables equipped with suitable matching connector plugs.
Start-up
CAUTION
The input and output ends of these attenuators
are clearly labeled. Do not couple an
attenuator backwards to the direction of power
flow. Destruction of the output resistor will
result.
Models 8322, 8323 and 8325 are labeled INPUT and OUT-
PUT on the respective ends. Model 8321 is labeled on the
output end only. The proper ends of these attenuators may
also be identified by the input connector being mounted on
the flat gold colored disc whereas the output connector is
mounted on the rounded silver colored dome. Connect the
attenuator to the transmitting equipment under test and to
a suitable load with 50 ohm coaxial cabling (RG-8A/U,
RG-9/U, RG-213/U or equal) equipped with plugs which
mate with the RF input and output connectors of the at-
tenuator. After the transmitter has been connected to the
attenuator, proceed according to the transmitter manufac-
turer’s instructions. When reconnecting the antenna, it may
become necessary to slightly readjust the transmitter due to
possible differences in VSWR between the attenuator and
the antenna system.
Normal
Operation
WARNING
Using these attenuators in the upper end of its power
dissipation range will cause the housing to become hot!
Care should be exercised in touching them.
Because the Series 8320 Attenuators are passive devices
and have no indicators or controls, they require no operat-
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