The Downstream Spectrum measurement mode allows for a 50 Mhz (default) or 10 Mhz (zoom) span which is determined by the selected center frequency. Within each frequency span a wavy measurement line (trace) with 201 frequency points is formed and is continuously updated. The total Downstream spectrum frequency range extends from 40 MHz to 1 GHz.

The following steps provide instructions for setting the center frequency:

1) From the Downstream Spectrum screen, press the Settings softkey, select Center Frequency.

2) Press ENTER.

A CENTER FREQUENCY dialog box is displayed.

3) Use the arrows to backspace and use the numeric keypad to set the telemetry frequency between 40 MHz and 1000 MHz.

4) Press ENTER.