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Operating Manual 6175.4760.02 – 01
3.159
M3SR Series 4100
Starting ATU Tuning
3.7.2.22
Starting ATU Tuning
Softkey
Softkey Type
Description
Initiates ATU tuning on current Tx frequency.
Press 'ATU Tune' softkey to initiate tuning pro-
cess.
The ATU starts tuning to the current Tx fre-
quency.
Usually, shortwave antennas have impedanc-
es far away from 50 ohms, the optimum load
impedance of the power amplifier (PA) or the
input impedance of the receiver.
During tuning the following status is dis-
played:
The task of the antenna tuning unit (ATU) is to
match the antenna impedance to the required
load impedance of 50 ohms.
This matching or ‘tuning’ can be performed by
either pressing 'ATU Tune', or more easily by
pressing the softkey 'ATU LEARN' in the Fixed
Frequency configuration menu, where the
matching of entire bands can be ‘learned’ in a
block.
If the band of interest was learned, it is not
longer needed to press ATU Tune after every
frequency change.
Please note, that ATU tuning and ATU learn-
ing result in RF radiation equivalent to approx-
imately 15 W output power.
For best results, avoid co-located transmitter
lines to transmit during ATU tuning.
If tuning is aborted, the following status is dis-
played:
Do not switch off the R&S GB4000C while
ATU tuning is in progress. Otherwise tun-
ing will be impeded when the
R&S GB4000C is switched on again.
If tuning failed, the following status is dis-
played:
In case of a 'Tuned failed' indication please try
to tune once again or check the antenna instal-
lation and the RF cable between PA and ATU.
Содержание M3SR 4100 Series
Страница 15: ...M3SR Series 4100 Documentation Overview xiv Operating Manual 6175 4760 02 01...
Страница 48: ...M3SR Series 4100 Index 34 Operating Manual 6175 4760 02 01 ZF4401 mod 02 2 10...
Страница 70: ...M3SR Series 4100 Radio Control 1 22 Operating Manual 6175 4760 02 01...
Страница 116: ...M3SR Series 4100 Example Configuration 2 46 Operating Manual 6175 4760 02 01...
Страница 336: ...M3SR Series 4100 Priority Channel 3 220 Operating Manual 6175 4760 02 01...
Страница 546: ...M3SR Series 4100 Further Settings are Relevant for SECOM H Operation 4 210 Operating Manual 6175 4760 02 01...
Страница 696: ...M3SR Series 4100 Remote Control 8 4 Operating Manual 6175 4760 02 01...
Страница 697: ...Operating Manual 6175 4760 02 01 9 1 M3SR Series 4100 Drawings 9 Drawings...
Страница 706: ...M3SR Series 4100 Drawings 9 10 Operating Manual 6175 4760 02 01...