1 PANEL DESCRIPTION1-18Microphoneq PTT SWITCHHold down to transmit, release to receive.w UP/DOWN KEYS [UP]/[DN]Push either key to change the operating frequen-➥cy, memory channel, Set mode setting, and so on.(p. 3-9, FM sec. 4, 11)Hold down either key for 1 second to start scan-➥ning.e UP/DN LOCK SWITCHSlide to turn the [UP]/[DN] keys lock function ON orOFF.HM-198 (Supplied)DONOFFwq eq PTT SWITCHHold down to transmit, release to receive.w PTT LOCK SWITCHPush to lock the PTT switch in the transmit mode.e UP/DOWN SWITCHES [UP]/[DN]Change the selected readout frequency or memorychannel.• Holding down continuously changes the frequency ormemory channel number.• While holding down XFC , the transmit readout frequen-cy can be controlled while in the split frequency mode.• The [UP]/[DN] switch can simulate a key paddle. Preset inthe “KEYER SET” mode (U/D KEY; MIC Up/Down Keyer).(FM sec. 4)r LOW CUT SWITCHPush (SM-50)/Slide (SM-30) to cut out the low fre-quency components of input voice signals.t PTT LOCK INDICATOR [LOCK](Only for the SM-30)Lights red when the PTT lock switch (w) is ON.y MIC GAIN VOLUME [MIC GAIN]Rotate to adjust the microphone output level.• Use this control as an addition to the microphone gainsetting of the connected transceiver.Rotating the control too far clockwise may resultin an output level that is too high and transmit sig-nal distortion.qryweD SM-50 (Option)D SM-30 (Option)q wtMIC GAINONOFFLOW CUTy rTOP VIEWBOTTOM VIEWThe optional OPC-589 cable is required to connect these 8-pin microphones.