Icom IC-M421

11
4
DUALWATCH/TRI-WATCH
3
4
■ Description
Dualwatch monitors Channel 16 while you are receiving an-
other channel; tri-watch monitors Channel 16 and the call
channel while receiving another channel.
■ Operation
q Select Dualwatch or Tri-watch in set mode. (p. 46)
w Push [▲] or [▼] to select the desired operating channel.
e Push [CH•DUAL] for 1 sec. to start Dualwatch or Tri-watch.
•“DUAL 16” appears during dualwatch; “TRI 16” appears dur-
ing tri-watch.
• A beep tone sounds when a signal is received on Channel 16.
r To cancel Dualwatch or Tri-watch, push [CH•DUAL] again.
[Example]: Operating tri-watch on INT channel 25.
BUSYBUSY-INT----
25W25W-DUPDUP-TAGTAG-
TRITRI 1616 -
23 34.154N34.154N-
135135 34.351E34.351E-
TELEPHONTELEPHON- UTCUTC-12:0012:00-
BUSYBUSY-INT----
25W25W--TAG-
TRITRI 1616 -
23 34.154N34.154N-
135135 34.351E34.351E-
INTLINTL - UTCUTC-12:0012:00-
-INTINT----
25W25W-DUPDUP-TAGTAG-
TRITRI 1616 -
23 34.154N34.154N-
135135 34.351E34.351E-
TELEPHONTELEPHON- UTCUTC-12:0012:00-
-INTINT----
25W25W-DUPDUP-TAGTAG-
TRITRI 1616 -
23 34.154N34.154N-
135135 34.351E34.351E-
TELEPHONTELEPHON- UTCUTC-12:0012:00-
Tri-watch starts.
Signal is received on call
channel.
Signal is received on
Channel 16 takes priority.
Tri-watch resumes after
the signal disappears.
DUALWATCH/TRI-WATCH SIMULATION
• If a signal is received on Channel 16, dualwatch/tri-watch
pauses on Channel 16 until the signal disappears.
• If a signal is received on the call channel during tri-watch,
tri-watch becomes dualwatch until the signal disappears.
• To transmit on the selected channel during dualwatch/tri-
watch, push and hold [PTT].
Call channel
Dualwatch Tri-watch
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