![background image](http://html1.mh-extra.com/html/icom/ic-m603/ic-m603_instruction-manual_2037984019.webp)
13
4
DUALWATCH/TRI-WATCH
3
4
■
Description
Dualwatch monitors Channel 16 while you are receiving
on another channel; Tri-watch monitors Channel 16 and the
call channel while receiving another channel. Dualwatch/Tri-
watch is convenient for monitoring Channel 16 when you are
operating on another channel.
■
Operation
q
Select the desired channel.
w
Push
[
F
]
, then push
[1•
]
to start Dualwatch or
[2•
]
to start Tri-watch.
• “
D
DU
UA
AL
L 1
16
6
” appears during Dualwatch; “
T
TR
RI
I 1
16
6
” appears dur-
ing Tri-watch.
• A beep tone sounds when a signal is received on Channel 16.
e
To cancel Dualwatch or Tri-watch, push
[CLR]
or repeat
step
w
.
TRI
DUAL
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]
.
Dualwatch
Tri-watch
Call channel
[Example]:
Operating Tri-watch on INT Channel 25
25W
25W
INT
INT
DUP
DUP
TAG
TAG
TRI
TRI 16
16
34
34°34.506N
34.506N
123
123°23.236W
23.236W
UTC
UTC 12
12:00
:00 TELEPHONE
TELEPHONE
BUSY
BUSY 25W
25W
INT
INT
CALL
CALL
DUP
DUP
TAG
TAG
TRI
TRI 16
16
34
34°34.506N
34.506N
123
123°23.236W
23.236W
UTC
UTC 12
12:00
:00
INTL
INTL
Tri-watch starts.
Signal is received on call
channel.
BUSY
BUSY 25W
25W
INT
INT
DUP
DUP
TAG
TAG
TRI
TRI 16
16
34
34°34.506N
34.506N
123
123°23.236W
23.236W
UTC
UTC 12
12:00
:00 TELEPHONE
TELEPHONE
Signal received on Channel
16 takes priority.
25W
25W
INT
INT
DUP
DUP
TAG
TAG
TRI
TRI 16
16
34
34°34.506N
34.506N
123
123°23.236W
23.236W
UTC
UTC 12
12:00
:00 TELEPHONE
TELEPHONE
Tri-watch resumes after the
signal disappears.
!IC-M603.qxd 06.7.28 1:46 PM Page 13 (1,1)