Yaesu FT DX 3000 Operating Manual

Also see for FT DX 3000: Operating manual Operating manual Operating manual Operating manual Operating manual

Contents

Page 65FT DX 3000 O peraTing M anualA bOUT ATU OperATiOnFigure 1 depicts a situation where normal tuning via the ATU has been successfully completed, and the tuning data hasbeen 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 holdsin 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 imped-ance closer to 50 Ohms. The ATU will refuse to memorize settings on frequencies where the SWR exceeds 3:1. A HighSWR may indicate a mechanical failure in the feed system, and can lead to the generation of spurious signals causingTVI, etc.About ATU MemoriesSWR (After tuning) Less than 1.5:1The tuner settings are stored in the ATU memory.SWR (After tuning) Greater than 1.5:1Tuning data will not be retained in memory. If you return to the same frequency, the tuning process must be re-peated.SWR (After tuning) Greater than 3:1The “HI-SWR” icon will light up, and the tuner settings, if achieved, will not be memorized. Please investigatethe high SWR condition and resolve the problem before attempting further operation using this antenna.uSing The auTOMaTic anTenna TunerFigUre 1FigUre 2Feed Point SWRSWR: 3.0Retuned SettingMemorized ATU TuningThe “HI-SWR” icon appears on the didplaywhen you transmit on the frequencySWR after ATU TuningFrequencyFrequency