Nautel NX25, Operation And Maintenance Manual

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NX300 Operations and Maintenance Manual Operating the transmitter
Page 2-28 Issue 3.0 2012-11-01
Table 2.1: Tool Menu Panels
Tool Description See Page
Spectrum Displays a spectrum analyzer, capable of monitoring the
transmitter’s RF output spectrum and the spectrum of the
signal generated by the exciter. 2-29
EQ Frequency
Response Displays the frequency response of the exciter’s EQ filter. 2-31
EQ Impulse
Response Displays the impulse response of the exciter’s EQ filter. 2-32
EQ Filter Delay Displays the delay of the exciter’s EQ filter across its
bandwidth. 2-33
AM-AM Correction Displays the amplitude compensation being applied to the
magnitude signal. 2-34
AM-PM Correction Displays the compensation being applied to the phase signal. 2-35
Signal Constellation For IBOC mode only. Displays the phase and amplitude of the
symbols being modulated within an OFDM sub-carrier as dots
on a cartesian graph. Also displays timing and data carrier
information. 2-36
Lissajous Plot Displays a Lissajous figure that represents the resultant vector
(magnitude and phase) for the applicable channels (either L
and R or I and Q). 2-37
Smith Chart Displays the impedance of the load as seen at the input to the
transmitter’s combiner. 2-38
Modulation Levels Displays L+R modulation, Envelope Magnitude and I/Q
modulation. I/Q bar graphs are relevant for DRM or IBOC
mode only. 2-39
Audio Inputs Displays the program input levels. Bar graph labels indicate
the source of each display. 2-40
Power Distribution Displays a CCDF plot that indicates the probability of
exceeding a given power level, based on the average power
level. Aids in determing peak power capability. 2-41