Kenwood TH-D74A User Manual - Page 43
Vox (voice-operated Transmission), Vox On/ Off, Vox Gain, Vox Delay Time
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VOX (VOICE-OPERATED TRANSMISSION) VOX eliminates the necessity of manually switching to Transmit mode each time you want to transmit. The transceiver automatically switches to Transmit mode when the VOX circuitry senses that you have begun speaking into the microphone. When you operate the VOX function, you must use an optional Headset; the internal speaker and microphone are too close to each other to be used for the VOX function. VOX On/ Off 1 Access Menu No. 150. 2 Select [On]. • When VOX is activated, the gain level, and delay time will appear on the display. From the Menu: 1 Access Menu No. 151. 2 Select the desired VOX gain level. VOX Delay Time If the transceiver returns to reception mode too quickly after you stop speaking, the end of your transmission may not be sent. To avoid this, select an appropriate delay time that allows your entire transmission to be sent, before Transmit mode ends. However, do not make the delay overly long. There are 2 ways to adjust the VOX Delay Time. While the VOX function is ON: 1 Press [ ]/[ ] to change the delay time to 250, 500, 750, 1000, 1500, 2000, or 3000 ms. Note: ◆◆ While in Menu mode, the VOX function is temporarily disabled. ◆◆ Since the VOX circuit must detect the presence of your voice, you may notice a slight delay in transmission; the very first part of your message may not be transmitted. ◆◆ When the VOX function is ON, the ASC function turns OFF. ◆◆ VOX cannot be used with an optional Speaker/ Microphone. From the Menu: 1 Access Menu No. 152. VOX Gain To enjoy the VOX function, take the time to properly adjust the VOX Gain level. This level controls the VOX circuit to detect the presence or absence of your voice. There are 2 ways to adjust the VOX Gain. While the VOX function is ON: 1 Speak into the headset microphone using your normal tone of voice to transmit. 2 Select [250], [500], [750], [1000], [1500], [2000], or [3000] ms. Note: ◆◆ If you press [PTT] while the VOX function is ON, the VOX Delay Time is not reflected to the transmission. ◆◆ If you press [CALL] (if 1750 Hz is programmed) to transmit a 1750 Hz tone, the VOX Delay Time is not reflected. ◆◆ If the DCS function is ON, the transceiver remains in Transmit mode for the duration set by the VOX Delay Time. It then sends a Turn-Off Code to close the receiving party's squelch. 2 Adjust the VOX Gain by pressing [ ]/[ ] until the transceiver reliably switches to transmission mode each time you speak while the transceiver is transmitting. 12-5
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