FLEX-6000 Signature Series - SmartSDR for Windows Software User’s Guide
Page 92
Copyright 2018 FlexRadio Systems. All Rights Reserved.
24.1.1 Manual Mode
To operate the ATU in manual mode without saving the ATU L/C values, make sure the MEM (ATU
Memory) button is unlit by clicking on it (ATU memories are enabled by default).
Press the 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 as shown by the indicator, leaving
the button illuminated indicating that the ATU is engaged or the ATU cannot achieve a
successful match, shown by the indicator leaving the button unlit indicating
that the ATU is not engaged (in Bypass mode). Note that if the ATU determines that being in Bypass
provides the best match, this is a successful ATU operation.
Pressing the button while in Bypass mode, will initiate a new ATU 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.
If the ATU is not able to provide a better impedance match and the SWR of the antenna system in
Bypass is greater than maximum SWR threshold, neither the ATU and MEM buttons will be
illuminated and the ATU status indicators will display Byp (Bypass) as shown here:
24.1.2 Memory Mode
The Antenna Tuning Unit (ATU) has been enhanced to store and recall L/C values for frequency ranges
per antenna port automatically. This feature is known as ATU Memories.
When the user initiates a manual mode ATU tune operation, a successful result can be either a better
match was not found resulting in the ATU being in Bypass mode or that the ATU is inline, presenting
a better impedance match to the transmitter. If the MEM (Memory) option was selected before the
ATU tune operation, the result of the ATU tune operation will be stored in a persistence database
otherwise known as a memory and recalled anytime the transmit slice is configured for that transmit
antenna port (ANT-1 or ANT-2) and ATU match frequency range. The ATU Memory feature eliminates
the need to manually retune the ATU to find a match when changing frequencies if the new frequency
range in question already has an associated ATU memory.
The enable ATU Memory mode, click on the button. It will be illuminated when ATU memory
mode is active.
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