Swr Scanner; Digital Bandwidth Filter - XIEGU G90 Benutzerhandbuch

SWR Scanner

The G90 has an antenna standing wave scanning/plotting function. It will scan
and plot the antenna's SWR over several frequency range widths settable by
the user.
Operation method:
1. Press and hold the [POW] button to start the standing wave plotting function.
2. Short press the button corresponding to FAST/SLOW displayed on the screen
to select the scanning speed.
3. Press the button corresponding to the QUIT displayed on the screen to exit
the standing wave scanner.
The function corresponding to the button:
BW: Corresponding to the [PRE] button
FAST: Corresponding to the [NB] button
QUIT: Corresponds to the [VM] button
Pressing the BW button will increment through 5 pre-set scanning ranges.
50 KHZ, 300KHZ, 450KHZ, 600Khz, and 700Khz. As you increment from 50Khz
to the wider ranges, the sampling increment will increment from 1-5Khz.
The results of the standing wave scanner are not calibrated to an exact reference and are for
relative readings only. For accurate measurement of antenna standing wave data, use a
professional antenna analysis device for measurement.
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The G90 has a built-in variable digital RX bandwidth filter.
Operation method:
1. Press the [FUNC] button to start the second function operation.
2. Press the [CMP/F-L] button to adjust the lower end of the filter and press the
[NB/F-H] to adjust the upper end of the filter.
Use the main tuning knob to make the filter adjustments.
Press the [CMP/F-L] button or [NB/F-H] button again to display the currently
numerical bandwidth values on the main LCD.
F-L:
Low pass cutoff frequency
of the filter.
F-H:
High pass start frequency
of the filter.
Total Filter bandwidth=(F-L – F-H) Hz)

Digital Bandwidth Filter

Bandwidth value
L
Bandwidth B
F-H frequency
(lower sideband)
25
F-L frequency
(top sideband)
F