16 ANTENNA TUNER OPERATION16-4Operating the AH-4D Before operatingR DANGER HIGH VOLTAGE!NEVER touch the antenna element while tuning ortransmitting.Always place it in a secure place.NEVER operate the AH-4 without an antenna connect-ed. The tuner and transceiver will be damaged.NEVER operate the AH-4 when it is ungrounded.Transmitting before tuning may damage the transceiver.Note that the AH-4 cannot tune when using a 1⁄2λ longwire or on a multiple of that frequency.D OperatingTuning is required for each frequency. Be sure to retunethe antenna before transmitting when you change thefrequency—even slightly.Pushq TUNER/CALL (L) to turn ON the AH-4.The CW mode and 10 W output power are automati-cally selected, and the tuning starts.• The TX LED lights red.• “ ” blinks while tuning.• After changing the frequency, you should hold downTUNER/CALL (L) for 1 second to manually start tuning. Inthis case, the CW mode and 10 W output power are au-tomatically selected, and the TX LED lights red.NOTE: DO NOT change the frequency and oper-ating mode while “ ” is blinking. It may takesapproximately 2 to 3 seconds (maximum of 15seconds) to complete tuning.w “ ” is still ON after the tuning is completed, andthe previously selected operating mode and the out-put power are automatically selected.• When the connected wire cannot be tuned, “ ” goesout, the AH-4 is bypassed and the antenna wire is di-rectly connected.PTT tune functionDThe AH-4 always tunes when [PTT] is pushed after thefrequency is changed on an HF/50 MHz bands (morethan 1%).Turn ON this function in the “Function” Set mode.(p. 17-20)SET (C) > Function > Tuner > PTT StartThe L, R, C or D in theinstructions indicate thepart of the controller.L: Left sideR: Right sideC: Center bottomD: Display (Touch screen)Left RightCenterDisplayTUNER/CALL
