Yaesu FT-450 Operation Manual

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

Page 39FT-450 OPERATION MANUALAUTOMATIC TX/RX S WITCHING USING V OICE C ONTROL (VOX)Instead of using the microphone’s PTT switch to activate the transmitter, the VOX (Voice Operated TX/RXControl) system provides hands-free, automatic activation of the transmitter, based on voice input into the mi-crophone. Setup of the VOX system takes only a few seconds.SSB/AM M ODE T RANSMISSION1. Press the [F] button followed by the [VOX/STO]button to engage the VOX operation.The “ ” icon will appear in the display.2. Without pressing the PTT switch, speak into themicrophone in a normal voice level.When you start speaking, the transmitter shouldbe activated automatically. When you finishspeaking, the transceiver should return to thereceive mode (after a short delay).3. To exit from VOX operation, press the [F] buttonfollowed by the [VOX/STO] button again.[HOME/RCL] button[F] button[DSP/SEL] knob[VOX/STO] button[F] buttonVOX GAIN ADJUSTMENTAdjust the VOX gain level to prevent accidental transmitter activation in a noisy environment.1. Press and hold the [F] button for one second toenter the Menu mode. The “ ” icon will ap-pear on the display.2. Rotate the [DSP/SEL] knob to select the menuitem “VOXGAIN”.3. Press the [DSP/SEL] knob to enable adjustment ofthis menu item. The “ ” icon will be blinking.4. Rotate the [DSP/SEL] knob to set to the pointwhere the transmitter is quickly activated by yourvoice, without causing background noise to acti-vate the transmitter. Available selections are 1through 100 (factory default: 50).Press the [HOME/RCL] button to reset the VOXgain level to the factory default.VOX DELAY ADJUSTMENT (THE TRANSMIT-RECEIVE DELAY AFTER THE CESSATION OF SPEECH)1. Press and hold the [F] button for one second toenter the Menu mode. The “ ” icon will ap-pear on the display.2. Rotate the [DSP/SEL] knob to select the menuitem “EXT MNU”.3. Press the [DSP/SEL] knob to enable adjustment ofthis menu item. The “ ” icon will be blinking.4. Rotate the [DSP/SEL] knob to select “ON” to ex-pand the menu items.5. Press the [DSP/SEL] knob. The “ ” icon re-turns to appear continuously.6. Press and hold the [F] button for one second to savethe new setting and return to normal operation.7. Press and hold the [F] button for one second toenter the Menu mode again. The “ ” iconwill appear on the display.8. Rotate the [DSP/SEL] knob to select the menuitem “VOX DLY”.9. Press the [DSP/SEL] knob to enable adjustment ofthis menu item. The “ ” icon will be blinking.5. Press the [DSP/SEL] knob. The “ ” icon re-turns to appear continuously.6. Press and hold the [F] button for one second to savethe new setting and return to normal operation.10. Rotate the [DSP/SEL] knob while saying a briefsyllable like “Ah” and listening to the hang time,so as to set the desired delay. Available selec-tions are 100 through 3000 msec (factory default:500 msec).Press the [HOME/RCL] button to reset the VOXdelay time to the factory default.11. Press the [DSP/SEL] knob. The “ ”” iconreturns to appear continuously.12. Press and hold the [F] button for one second to savethe new setting and return to normal operation.[HOME/RCL] button[F] button[DSP/SEL] knob