Nautel NX15, Operation And Maintenance Manual

Page: 53 / 178

NX15/NX25 Operations and Maintenance Manual Operating the transmitter
Issue 6.0 2019-01-31 Page 2-29
Table 2.2: 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. page 2-31
EQ Frequency
Response Displays the frequency response of the exciter’s EQ filter. page 2-33
EQ Impulse
Response Displays the impulse response of the exciter’s EQ filter. page 2-34
EQ Filter Delay Displays the delay of the exciter’s EQ filter across its
bandwidth. page 2-35
AM-AM Correction Displays the amplitude compensation being applied to the
magnitude signal. page 2-36
AM-PM Correction Displays the compensation being applied to the phase signal. page 2-37
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. page 2-38
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). page 2-39
Smith Chart Displays the impedance of the load as seen at the input to the
transmitter’s combiner. page 2-40
Modulation Levels Displays L+R modulation, Envelope Magnitude and I/Q
modulation. I/Q bar graphs are relevant for DRM or IBOC
mode only. page 2-41
Audio Inputs Displays the program input levels. Bar graph labels indicate
the source of each display. page 2-42
Power Distribution Displays a CCDF plot that indicates the probability of
exceeding a given power level, based on the average power
level. Aids in determining peak power capability. page 2-43