Mocomtech CDM-QX - Manual (Page 157)

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Ethernet Management MN/CDMQX.IOM
6–27
Spectrum Analyzer Knobs
(Available on the Rx and MD nested Test pages) – Note the following:
• Mode – Use the drop-down menu to select the Spectrum Analyzer as On or Off. When
the Spectrum Analyzer feature is turned ON, the selected demodulator will not be
allowed to receive traffic, and the built-in BERT monitoring is ignored. Noted that the
Spectrum Analyzer display, which replaces the Constellation display on this page, only
captures the spectrum.
Figure 6-14 depicts a MD Æ Test page with the Spectrum Analyzer activated.
• Center Frequency – The Center Frequency is similar to Rx Frequency in a regular
demodulation function with a resolution of 100 Hz. Enter the desired value into this field.
• Span – To select a predefined span, click on the text box, then select 97.65625 kHz,
195.3125 kHz, 390.625 kHz, 781.25 kHz, 1.5625 MHz, 3.125 MHz, 6.25 MHz, or the
default value of 12.5 MHz.
Refresh Constellation / Analyzer
(Available on the Rx and MD nested Test pages) – Use the drop-down menu to select Auto
Refresh as On or Off. When this feature is turned on, depending on the mode selected, the
display will automatically update every 10 seconds.
Note that, for the Spectrum Analyzer Knobs and Refresh Constellation / Analyzer sections, no
actions will be recognized until the user clicks [Submit].
Figure 6-14. Nested Test Page with Spectrum Analyzer Mode ‘On’ – Rx, MD