Yaesu FT-450 Operation Manual

Also see for FT-450: Brochure & specs Reference Manual User manual Technical supplement

Page 94 FT-450 OPERATION MANUALINSTALLATION OF O PTIONAL ACCESSORIESACTIVE -T UNING ANTENNA S YSTEM (ATAS-100/-120/120A) O PERATIONThe optional ATAS-100, ATAS-120, or ATAS-120A Active-Tuning Antenna System permits operation on a num-ber of HF bands (7/14/21/28 MHz) plus 50 MHz.The FT-450 provides microprocessor control of the tuning mechanism in the ATAS antenna for convenientautomatic tuning.Interconnections to FT-450“ATAS-120A” is connected referring to the figure below.ADVICE:Always turn off the power switch on the FT-450 and the external power supply before you connect any cables.ATTENTION: Do not touch the cables or connectors with wet hands. Do not touch the cables or connectors when you transmit. There is danger of electric shock or other seriousinjury. It is not possible to use an ATU-450 or the FC-30 with an ATAS-120A at the same time.InstallationBefore operation can begin, you must instruct the FT-450’s microprocessor that the ATAS-100/-120/-120A isbeing used. This is done using the Menu Mode:1. Press and hold the [F] button for one second toenter the Menu Mode.The “ ” icon will appear in the display.2. Rotate the [DSP/SEL] knob to select the MenuItem “TUNER”.3. Press the [DSP/SEL] knob to enable this selectedMenu Item.4. Rotate the [DSP/SEL] knob to change the settingto “ATAS”.5. Press and hold the [F] button for one second toreturn to normal operation.OperationAUTOMATIC TUNING1. Press the [TUNE] button briefly to activate theAutomatic Antenna Tuner.The “ ” icon will appear in the display.If the transceiver frequency is out of the amateurband, the “ ” icon will not appear.If the antenna SWR is High (more than 1:2.0), the“ ” icon will blink.2. Press and hold the [TUNE] button for one secondto begin automatic tuning. The transmitter will beengaged, and the “ ” icon will blink while tun-ing is in progress.3. Tuning will stop automatically when a low SWR isachieved. You may Press and hold the [TUNE]button for one second while tuning is in progress,to cancel the automatic tuning.[DSP/SEL] Knob [F] button[TUNE] button