Wavetek 3ST Specifiche Scaricare il pdf (Pagina 55)

4-31

Information displayed in the C/N mode is as follows:

• Channel number

• Channel label

• Carrier frequency

• Noise offset frequency

• Noise frequency

• Bandwidth

• C/N ratio

• Channel plan

To make a carrier to noise measurement, press the C/N key. The

C/N ratio of the tuned channel or frequency will be displayed.

Bandwidth Adjustments

To edit the bandwidth, press the BW soft key. The bandwidth can

be adjusted by using the UP and DOWN arrow keys or by entering a

value using the numeric keypad and then pressing the ENTER key.

The FCC specification for C/N measurements is a bandwidth of

4.200 MHz. CATV organizations outside of the United States may

have different requirements.

Noise Offset Frequency Adjustments

The frequency at which the noise level is measured is the Carrier

frequency plus the noise offset. To adjust the noise offset, press the

OFFSET soft key. The offset can be adjusted by using the UP and

DOWN arrow keys or by entering a value using the numeric keypad

and then pressing the ENTER key.

Note: BW and Noise Offset values can be defined individually for

each channel (see section 4.3.4 "How To Edit Channel Parameters").

When tuning by channel number, the BW and Noise Offset values

can be adjusted using the Offset and BW soft keys. However, these

adjustments will affect the C/N screen only and will not change the

setup value in the channel plan.

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Wavetek 3ST Specifiche Pagina 55

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Wavetek 3ST Specifiche Pagina 55

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