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bandpass filter around the current frequency to reduce interference from
adjacent signals either above or below your operating frequency.
♦ Properly adjusting the filter parameters can greatly improve the performance
of the receiver as well as its sensitivity and signal to noise ratio.
♦ In CW mode, the digital filter can be made as narrow as 50Hz but there will
be obvious deterioration of the resulting audio at such an extremely narrow
setting. 300-500 Hz is normally ideal.
Spectrum/ Waterfall Display
The G90/S radio can display the radio spectrum and waterfall diagrams of
received signals and you can quickly observe whether there is a signal on the
desired frequency of operation. You can also easily identify a clear frequency
to QSY (move freq.) to in case there is QRM (interference) occurring on the
frequency you are currently using.
Spectrum display bandwidth is 48kHz
The spectrum signal strength value displays with an accuracy of ±2dB
The sensitivity of the spectrum display (scale) can be adjusted for the conditions
of the band you are operating on. If the scale is set too high, very strong signals
may have their signal peaks cut off. You may adjust the scale by doing the
following:
1. Press the [FUNC] button momentarily and then the lock button, to enter the
SCALE reference level setting.
2. Rotate the main tuning knob to adjust the SCALE value until the display
sensitivity is appropriate.
3. Press the main tuning knob in momentarily to save and exit the setting
screen.
■ The SCALE reference values gradually increase from 1 to 10. When strong
signals are observed, scale values need to be lowered. When looking at weak
signals, the SCALE values can be increased. Generally, bands under 14 MHz
will need less sensitive settings.
■ The SCALE value in each frequency range can be set independently.
The second function (with the FUNC button activated) of the [LOCK] button is
as follows:
SCALE: set the reference level setting
AVE: set the average value setting
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