FLEX-6000 Signature Series – Maestro User Guide
Page 89
Copyright 2019 FlexRadio Systems. All Rights Reserved.
21.3 MANUAL MODE
To operate the ATU in Manual mode, make sure the ATU MEM button in the TX Menu is unlit by
tapping it. ATU memories are enabled by default.
Tune the transmitter to the desired frequency. Press the ATU button to initiate an ATU tuning
operation. The ATU will set the power output to approximately 2W on 6m and 10W on all other
bands during the tuning operation. The ATU will tune until it either achieves a successful impedance
match or finishes in Bypass mode. Note that if the ATU determines that Bypass provides the best
match, and the resulting SWR is less than the criteria for success, this is considered a successful tuning
operation.
Tuning the transmit Slice to a frequency outside of the ATU Match Frequency Range or to a different
band will disable the ATU, putting it into Bypass mode. The ATU button will be off.
The ATU button will illuminate in red immediately after it is pressed, while the tuning operation is in
progress.
The ATU button will illuminate in green when a match is found resulting in an SWR less than the
match criteria for the band. This includes Bypass mode when the antenna system is well matched.
If a good match cannot be found, the ATU button will be off. If a partial match is found – the ATU
can improve the match but can’t meet the criteria for a good match -- the ATU will remain engaged
with the partial match and the ATU button will be off.
21.4 MEMORY MODE
To operate the ATU in Memory mode, make sure the ATU MEM button in the TX Menu is lit by
tapping it. ATU memories are enabled by default.
Tune to the desired frequency. If the ATU has successfully tuned the selected antenna at or near this
frequency in the past, the ATU button will illuminate in green indicating the stored result has been
applied. This includes Bypass when Bypass is best. If the button is not lit, an acceptable match was
not stored, and the transmitter should not be used until the problem is corrected.
Pressing the ATU button will start a new tuning cycle and the results will replace the previously stored
results for that frequency. The ATU will set the power output to approximately 2W on 6m and 10W
on all other bands during the tuning operation. The ATU will tune until it either achieves a successful
impedance match or finishes in Bypass mode. Note that if the ATU determines that Bypass provides
the best match, and the resulting SWR is less than the criteria for success, this is considered a
successful tuning operation.
The ATU button will illuminate in green when a match is found resulting in an SWR less than the
match criteria for the band.
If a good match cannot be found, the ATU button will be off. If a partial match is found – the ATU
can improve the match but can’t meet the criteria for a good match -- the ATU will remain engaged
with the partial match and the ATU button will be off.
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