Bird Technologies 8890-400 Series - Manuale (Pagina 11)

Chapter 1
Introduction
This instruction book is intended for use by operators of the
Model 8890-400 Termaline Wattmeter.
This chapter contains introductory information including
product specifications; items supplied; and accessory items
available.
Purpose and
Function
The Series 8890-400 Termaline Wattmeters are low reflec-
tion and nonradiating termination’s for coaxial transmission
lines. They aid in the tuning and troubleshooting of trans-
mission equipment whose characteristics fall within the per-
formance range of the elements used. These performance
specifications are described in the next paragraph and sum-
marized in the Specifications.
Items
Supplied
s Coolant — Pre-filled unit
s Shipping Plug
s Vent Relief Valve
s Coupler — Pre-Mounted
s Instruction Manual
Description The Series 8890-400 Wattmeters will safely and continu-
ously dissipate up to 5000 watts of RF power when blower
equipped. It is possible to subject these loads to moderately
higher power for limited periods of time. In this case it is
recommended that an 8890-400 be equipped with an over-
temperature thermoswitch, Bird P/N 8890-008, which
should be interlocked with the source of RF energy. In this
way, the load will be automatically protected from the con-
sequences of over heating. The intended frequency range is
2 to 1000 MHz within which the loads will reflect very little
power back to the source. The actual VSWR, “Voltage
Standing Wave Ratio”, will not exceed 1.15 to 1.00 from dc
to 1 Ghz.
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