Nautel NX300, Operation And Maintenance Manual

Page: 47 / 162

NX300 Operations and Maintenance Manual Operating the transmitter
Issue 3.0 2012-11-01 Page 2-29
Figure 2.15: Spectrum Analyzer
Spectrum analyzer.
See Figure 2.15 . The carrier level is normalized to its unmodulated level at
0 dB. The graph center is always at the carrier frequency, as defined by the Exciter’s set Frequency
value.
Masks are shown based on transmission mode and are defined by the following standards:
• Analog AM standard: NRSC-2-B
• DRM and DRM+AM standards: ITU-R SM.328-11 and ITU-R SM.1541-4
• IBOC and IBOC+AM: NRSC-5-C
NOTE:
Any spurious emissions that are displayed are a product of the spectrum analyzer and are not
actually present on the transmitter output.
Touch on the panel to display a cursor on the trace in the approximate area. The cursor position
(frequency and amplitude) is shown in the upper, right-hand corner of the panel. The center
frequency is shown in the upper, left-hand corner of the panel. Touch in other areas of the spectrum
analyzer panel to provide a coarse adjustment of the cursor position.
Peak Cog
Cursor
Left
Cursor
Right
Close
Minimize
(Maximize)