Wavetek 3SR Dokumentacja Pobierz pdf (Strona 54)

4-31

In the C/N mode the carrier to noise ratio of the tuned channel or

frequency is displayed. The C/N measurement bandwidth and the

frequency offset for the noise measurement may be controlled from

the screen. A proprietary DSP technique allows C/N measurements

on modulated carriers (non-scrambled channels). The measurement

is made by measuring the video carrier level and then tuning to the

offset frequency, searches for a quiet line. Once a quiet line is found,

the unit will then measure four consecutive frames and average the

values together. The value is then corrected for the selected band-

width, and the C/N ratio is computed.

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

• Battery status

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.

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Wavetek 3SR Dokumentacja Strona 54