Wavetek 147 Specifikace stáhnout pdf (Strana 45)

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Description and Basic Operation: Basic Modes of Operation

Spectrum Analysis

The SDA-5000 features an advanced spectrum analysis capability. This is a

simple but extensive tool for tracking down hard-to-find problems in the

cable network. The following list describes the features of this tool:

The spectrum analyzer works over the entire 5

MHz to 1 GHz frequency range.

Tuning can be by channel or by frequency.

Several convenient frequency spans are

available, from 3 to 50 MHz.

Maximum hold and dwell time can be varied to

track down intermittent signals.

A low-pass filter and preamplifier are available

to help find difficult return path problems.

The spectrum mode includes a very powerful Zero Span mode display that

you can use to measure and analyze TDMA (Time Division Multiple Access)

digital channels and difficult ingress signals. Zero Span mode allows you to

perform in-service and in-channel D/U (desired/undesired) measurements

on TDMA channels. You can also see different transmitter levels individually,

view data “collisions,” and see how heavy the traffic is on the coax.

You can also measure CSO (composite second order) and CTB (composite

triple beat) using Spectrum mode. These measurements can help you find

the source of inter-modulation problems and confirm compliance with

system performance specifications.

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Wavetek 147 Specifikace Strana 45

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