Wavetek 147 Spécifications télécharger pdf (Page 185)

100

101

Digital Analysis (QAM View OPT4): QAM Ingress Mode

161

• channel number and modulation format

• graph reference and scale values

• left, center, and right frequencies on the graph

• two cursor frequency and level (in relation to the carrier) values

• Delta of the two cursor values.

This screen also shows the interference level in dBc values for each cursor.

This value, called “decibels with respect to the carrier,” indicates the noise

power with respect to the signal power. The dBc value must be interpreted in

relation to the Reference Level value (in dBc) located in the upper left corner

of the screen. Editing the Reference Level is discussed below in this section.

NOTE: Resolution and video bandwidths are fixed by the

algorithm and graph size. Frequency span is fixed by the

symbol rate of the channel.

Basic Operation

To activate QAM INGRESS Mode, press the green Function key and then

press the Spect Measurement Mode key.

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