Page 66 FTDX1200 Operating Manual

USING THE AUTOMATIC ANTENNA TUNER Cont'd
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ABOUT ATU OPERATION
Figure 1 depicts a situation where normal tuning via the ATU has been successfuly completed, and the tuning data has been stored in the ATU memory. The antenna system as seen by the transmitter is shown.

In Figure 2, the operator has changed frequency, and the "HI-SWR" icon has appeared. The operator presses and holds in the [TUNE] button for two seconds to begin impedance matching using the ATU.

If a high SWR condition exists (above 3:1), corrective action must be taken in the antenna system to bring the impedance closer to 50 Ohms. The ATU will refuse to memorize settings on frequencies where the SWR exceeds 3:1. A High SWR may indicate a mechanical failure in the feed system, and can lead to the generation of spurious signals causing TVI, etc.





About ATU Menories

SWR (After tuning) Less than 1.5:1
The tuner settings are stored in the ATU memory.

SWR (After tuning) Greater than 1.5:1
Tuning data will not be retained in memory. If you return to the same frequency, the tuning process must be repeated.

SWR (After tuning) Greater than 3:1
The "HI-SWR" icon will light up, and the tuner settings, if achieved, will not be memorized. Please investigate the high SWR condition and resolve the problem before attempting further operation using this antenna.

End of "About ATU Operation"

End of "Using the Automatic Atenna Tuner"
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Page 66 FTDX1200 Operating Manual