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OTHER FUNCTIONS
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■ Intercom operation
The optional Intercom function allows you to talk to the deck
from the cabin. The optional HM-157
COMMANDMIC II
™ is
required for Intercom operation.
Connect an optional HM-157 as described on pgs. 35, 52.
• Transmitting is impossible during Intercom operation.
• The received signal is muted during Intercom operation.
q Push [LO/DX•
IC] for 1 sec. to enter Intercom mode.
• The HM-157 power is automatically turned ON, even if the power
is OFF.
w Push [LO/DX•IC] for 1 sec. again to call up the HM-157
side.
• The transceiver and the HM-157 emit call beeps.
e Push and hold [PTT] and speak at a normal voice level
into the microphone.
• “”or “”appears on the caller or listener function dis-
play, respectively.
• To adjust the IC-M422’s speaker output level, rotate [VOL].
• To adjust the HM-157’s speaker output level, push [Y] or [Z]
after pushing [VOL• PA/RX ] on the HM-157.
r After releasing [PTT] you can hear the response through
the speaker.
t To return to the normal operation, push [LO/DX•
IC] mo-
mentarily.
• [16•9] and [DISTRESS] keys are also available.
• While in the Intercom mode, the transceiver functions
(transmit and receive) are interrupted. If the transceiver
is in transmit condition, the Intercom function is not avail-
able.
• When a DSC call is received, “DSC” appears and the
DSC message is displayed at the channel comment indi-
cator after the Intercom use is finished.
• When a WX alert is received, “WX ALT” blinks and a
beep sounds. The WX alert sounds after the Intercom
use is finished.
HM-157 (listener)IC-M422 (caller)
DIM
HM-157IC-M422
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