O P E R A T I O N C H A P T E R 1 0
ATU (Antenna Tuning Unit) Operation
Figure 160: Front Panel Controls Used to Operate the ATU
Note: The ATU offered by FlexRadio is a customized version of the LDG Z-
100. For more detailed information please refer to the Z-100 operating
manual, which can be found at:
http://www.ldgelectronics.com/manuals/Z-100Manual.pdf.
In the following we will describe how to operate the ATU using the PowerSDR software. Please use the
above figure to identify the controls referenced.
1. Follow the Power Up Procedure, described above. Then click the On button (14).
2. Calibrate the 100W PA using the procedure discussed above in the Automatic Amplifier Gain
Calibration section of the Software Setup chapter.
3. Select either the Memory or Full tuning mode on the ATU Tuning Mode (19) control.
Note 1: If the ATU Tuning Mode (19) control is not visible on the front panel,
enable the ATU Present checkbox on the Hardware Config Sub-Tab of
the General Tab of the Setup Form.
Note 2: Bypass will bypass the ATU. Memory will attempt to tune from memory
and if no tuned setting is saved near the present frequency, the ATU will
perform a full tuning cycle. Full will immediately perform a full tuning
cycle, ignoring any previously saved settings.
166 ď›™FlexRadio Systems
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