Robotron Pty Ltd G9P 用户手册
WiNRADiO G39DDC User’s Guide
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The Short Time DDC Averaging method is preferable and will yield
improvement in most cases of atmospheric or man-made interference. It is
activated by pressing the Enable DDC Averaging button located under the
Noise Blanker tab. If the instantaneous signal level at the input of the
demodulator exceeds the short-time average level by a user-adjustable
percentage amount, these signal samples will be replaced by zero values.
improvement in most cases of atmospheric or man-made interference. It is
activated by pressing the Enable DDC Averaging button located under the
Noise Blanker tab. If the instantaneous signal level at the input of the
demodulator exceeds the short-time average level by a user-adjustable
percentage amount, these signal samples will be replaced by zero values.
The Sample Excess setting should be adjusted as a compromise between the
noise blanking effect and the minimum acceptable distortion of the wanted
signal. The current value of the signal excess above the short-time average is
indicated in the associated display, to assist with the adjustment.
noise blanking effect and the minimum acceptable distortion of the wanted
signal. The current value of the signal excess above the short-time average is
indicated in the associated display, to assist with the adjustment.
The ADC Input Threshold method is activated by pressing the Enable ADC
Threshold button. If the input at the ADC exceeds that defined by the ADC
Threshold control, the ADC input will be blanked. The current ADC level is
shown in the adjacent display to help with this adjustment. The maximum level
(100%) corresponds to the entire input range of the ADC.
Threshold button. If the input at the ADC exceeds that defined by the ADC
Threshold control, the ADC input will be blanked. The current ADC level is
shown in the adjacent display to help with this adjustment. The maximum level
(100%) corresponds to the entire input range of the ADC.
Pause
The Pause facility makes it possible to temporarily stop the audio and resume
it at any time – a useful function if one needs to get away from the receiver for
a while. This is a rather unique feature, specific to the Excelsior, the world’s
first in professional wideband receivers. While the receiver is pausing, the
entire incoming down-converted pre-demodulation signal (DDC2 output) is
being stored in a temporary buffer, so that other demodulation-related
functions, such as the audio filter or notch, can be still applied on the resumed
signal.
it at any time – a useful function if one needs to get away from the receiver for
a while. This is a rather unique feature, specific to the Excelsior, the world’s
first in professional wideband receivers. While the receiver is pausing, the
entire incoming down-converted pre-demodulation signal (DDC2 output) is
being stored in a temporary buffer, so that other demodulation-related
functions, such as the audio filter or notch, can be still applied on the resumed
signal.
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The Max. buffer time setting determines the amount of disk space to be
allocated for the pause buffer, i.e. the maximum length of the pause. Any
signal that is older than the maximum buffer time allows will be discarded.
allocated for the pause buffer, i.e. the maximum length of the pause. Any
signal that is older than the maximum buffer time allows will be discarded.
Pressing the Pause button activates this function. The audio will be muted and
the DDC2 spectrum will freeze. The DDC2 signal stream will be saved into the
the DDC2 spectrum will freeze. The DDC2 signal stream will be saved into the