Wavetek 3ST Spezifikationen PDF herunterladen (Seite 6)

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SECTION 1 GENERAL INFORMATION

1.1 INTRODUCTION

The Wavetek Sweep System Transmitter performs essential cable TV

system preventive maintenance tests with accuracy and ease. Signal

levels, hum, C/N, and frequency response can be quickly tested

without subscriber interference.

The Sweep System is made up of two components; the Sweep System

Receiver 3SR, and Sweep System Transmitter 3ST. The contents of

this manual will describe the care and operation of the Sweep System

Transmitter 3ST, including Reverse Sweep operation.

Sweep response is tested by injecting a low level signal in vacant

spectrum areas, and monitoring cable system carrier levels in occupied

spectrum areas. In addition to generating the sweep test signal, the

Transmitter 3ST continuously monitors the system carriers. The 3ST

sends headend level readings to the 3SR Receiver with every sweep

update. In this way, any headend level changes are compensated by

the receiver to maintain the utmost measurement accuracy.

Sweep response measurements won't be affected by signal levels

changing in the headend. The Transmitter 3ST has all of the mea-

surement capability of the 3SR Receiver, so the Headend Technician

can keep an eye on headend levels.

With the Reverse Sweep option, a transmitter is built into the hand-

held sweep receiver. The headend sweep transmitter (3ST) is set up

to receive the reverse sweep sent from the field. When a reverse

sweep is activated from a field test point, the headend transmitter

receives the telemetry signal that indicates which receiver is sending

the sweep. The headend transmitter measures the sweep, and sends

the results, along with the serial number of the sending receiver via its

telemetry signal to the field. The field receiver with the tagged serial

number then displays the sweep response as measured in the headend

on its LCD.

MODEL 3ST

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Wavetek 3ST Spezifikationen Seite 6