In tro duc tion. 1, Pur pose and func tion. 1, Items sup plied. 1 – Bird Technologies 8890-400 Series Manuale d'uso

Pagina 11: De scrip tion. 1, Introduction, Purpose and function, Items supplied, Description

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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.

1

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