Nautel VX150, Operation & Maintenance Manual

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VX150 TO VX2 OPERATIONS & MAINTENANCE MANUAL OPERATING THE TRANSMITTER
VERSION 1.0 2022-12-08 PAGE 2.2.23
• Resolution Bandwidth: determines the FFT bin size or the smallest frequency that can be
resolved. Allowable range is 75 - 10,000 Hz. Default setting is 1000 Hz.
• Averages: determines the number of averages that the analyzer performs per sweep. Press the
Clear Averaging button to restart the averaging process. Allowable range is 0 - 100. Default
setting is 19.
• Span: determines the start and stop frequencies of the analyzer with the carrier frequency
always at the center. Allowable range is 10 - 1200 kHz. Default setting is 1000 kHz.
• Measurement Options: determines the source of the spectrum plot that is being displayed.
Selecting Internal (FM) uses the exciter’s RF signal, before being equalized (if applicable).
Spectrum analyzer bandwidth is defaulted to 1 MHz, but can be increased to 1.2 MHz. Select-
ing MPX bandwidth displays the entire composite baseband signal (100 kHz wide).
Figure 2.2.14: Spectrum Settings
NOTE
:
The FM spectrum analyzer displays the ideal spectrum generated by the DSP. It is not necessarily
the same as the spectrum seen at the RF output.