Wavetek 3ST Especificações descarregar pdf (Página 28)

4-4

The next step is to test the sweep by connecting the Model 3SR

receiver to a test point and pressing the SWEEP key (Ensure the

3ST Transmitter is also in the Sweep mode). After telemetry is

found, the receiver will begin sweeping. If telemetry is not found

make sure the 3ST Transmitter and the 3SR Receiver are configured

for the same telemetry frequency. Check to ensure the level of the

sweep, seen in empty spectrum areas, is 15 dB below video carrier

level. At first there will be no references for the normalized compari-

son.

Storing A Sweep Reference

Wait until the "wait" indicator on the top of the sweep display

disappears, then press the FILE key. Next press the Sweep Refer-

ences soft key. The first step is to enter the name of the reference.

This can be any name that makes sense to you, and identifies the

location of the reference measurement.

After the reference is stored, press the SWEEP key, and the sweep

will be compared to the reference you just stored. The response

should be relatively smooth, the D marker should indicate < 1.0 dB.

If you have a higher number than this, or if the number is fluctuating

above this, you may need to do some channel plan editing to identify

scrambled channels, or to properly identify active/inactive channels

of FM or data carriers.

4.3 SETUP

There are four setup modes for the 3ST Transmitter; General,

Measurements, Channel Plan, and Sweep Transmitter. General setup

allows the operator to configure general aspects of the unit (not

specifically related to measurements) for personal taste. Measure-

ments setup permits the operator to setup certain parameters that

apply to specific measurements. Channel Plan setup allows the

operator to configure channel tuning to match the specific character-

istics of a particular cable system. Sweep Transmitter setup lets the

operator setup sweep transmission parameters.

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Wavetek 3ST Especificações Página 28