339 SET MODESD Microphone gainSets the microphone gain to between 1 and 4 to suit yourneeds. Higher values make the microphone more sensitiveto your voice.NOTE: When using the VOX function, we recommend set-ting the microphone gain to 3. However, you can adjust itto suit your operating environment (including your headsetperformance).D VOX delayThe VOX Delay is the amount of time the transmitter staysON after you stop speaking.Sets the VOX Delay to between “VXd.05” (0.5 seconds),“VXd.10” (1 second), “VXd.15” (1.5 seconds), “VXd.20”(2 seconds), “VXd.25” (2.5 seconds) and “VXd.30” (3 seconds).D VOX Time-out TimerSets the VOX Time-out Timer to 1, 2, 3, 4, 5, 10 or 15 min-utes to prevent accidental prolonged transmission by the VOXfunction.To turn OFF the function, select “Vto.OF.”The VOX Time-out Timer must be set shorter than theTime-out Timer, otherwise this timer will not function.D DTMF TX keySelects the method to transmit a DTMF code sequence.While holding down [PTT], push one of the keys, [0] to [9],[MONI](A), [](B), [](C), [ ](D), [M](E), and [# ENT](MN.W)(F).• dmt.k : Transmits the appropriate DTMF code assigned to thekey.• dmt.m : Transmits the programmed DTMF code sequence in theDTMF memory channel assigned to the key.D Operating modeSet the operating mode to FM or FM-N. The operat-ing mode is determined by the modulation of the radiosignal.FM mode FM-N mode