Automatic Antenna Tuner; Standing-Wave Scanner Swr - XIEGU G90 Operation Manual

Automatic Antenna Tuner

The G90/S has an efficient ATU to help you quickly match many kinds of
antennas effectively.
1. Press the [TUNE] button in momentarily to bring the built-in antenna tuner
into circuit. An antenna icon will appear at the top of screen.
2. To initiate an antenna "tune", hold the [TUNE] button for > 2 sec.
Note:
1. Pressing the (TUNE) button momentarily will show the antenna icon on the
screen. This indicates that antenna tuner in in-line. If you need to tell the ATU
to tune (new antenna, different frequency) hold the Tune button in for >2 sec."
Tuning" will be displayed.
2. After the antenna is "tuned" (actually it is matched to the radio rather than
"tuned"), leave the ATU ON so that it will provide the antenna match during
operation.
3. If the "SWR" icon is displayed at the top of the screen and flashes once while
transmitting – even after tuning, this indicates that the standing-wave of current
antenna is too high and while another tuning action may be attempted, this could
also indicate a faulty antenna.
4. When performing a tuning action via a long press of the Tune button, the
tuner will go through its complete matching procedure and then return to receive
mode after completion. (this may take several seconds)
5. When your antenna is physically very close (e.g. a vertical mobile antenna),
strong radio frequency interference may be caused to the radio or electronic
equipment nearby. If this happens try to locate the antenna further away.

Standing-wave Scanner SWR

The G90/S has an antenna SWR scanning function. It can scan the standing-
wave values of the connected antenna to help you adjust the antenna.
1. A long press of the [POW] button enables the standing-wave scanning
function. It will scan the SWR of the antenna currently connected.
2. Press the button below the BW label on the screen momentarily to switch the
frequency step of the scan.
3. At the bottom of the screen, the frequency of the lowest SWR point of the
scanned standing wave is indicated. This is where the antenna is "resonant".
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