O P E R A T I N G F O R M S
C H A P T E R 5
(39) ATU
The ATU Settings form enables you to control the internal, optional ATU. If you do not have an ATU
installed, this form will not be available to you.
Operating Mode
Bypass:
Bypasses the internal ATU. When selected the
Tuning Options
become unavailable.
Semi-Automatic:
Requires pressing either
Memory Tune
or
Full Tune
to find a match.
Automatic:
Will automatically tune when RF is detected. You do not need to press either
Memory Tune
or
Full Tune
. Once selected, you can close the form. The ATU will now
continuously monitor the SWR and retune as required.
Note:
When set to
Automatic
it is possible that the ATU frequently retunes.
If this is the case you can either try to select a higher
SWR
Threshold
or select
Semi-Automatic
instead.
Tuning Options
Memory Tune:
When pressed the ATU will perform a tuning cycle by first checking its memory
for a match. If no match can be found, a
Full Tune
is performed. This is the fastest tuning
option. While tuning is in progress, the button will be highlighted in yellow.
Full Tune:
When pressed, the ATU performs a tuning cycle ignoring its internal memory, which
may take longer than
Memory Tune
. While tuning is in progress, the button will be highlighted
in yellow.
Use TUN:
Check to transmit a carrier at the power level set by the
Tune Power
control on the
Setup Form-Transmit Tab (see page 111). The ATU will use this carrier when either
Memory
Tune
or
Full Tune
is selected.
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2003-2008 FlexRadio Systems
Figure 146: ATU Settings Form
