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1. OPERATIONAL OVERVIEW
1-9
1.2.8 Quick selection of CH16
Press the CH16 key to select CH16, the International Calling and Safety
Channel. The use is limited to distress, safety and calling. The transmission on
CH16 (156.800 MHz) should be limited to within 1 minute except for distress
calling.
Avoid calling on CH16 for purposes other than distress, urgency and very brief
safety communications when another calling channel is available.
1.2.9 Dual watch
The dual watch function permits watch on CH16 and another selected channel.
CH16 and another channel are watched at intervals of 0.15 seconds and one
second, respectively.
To start dual watch, first select the other frequency to watch and then press the
SHIFT key and 9 DW key in that order. When the receiver finds a signal on
CH16, it locks on it and restarts dual watching after the signal on CH16 has gone.
If another channel has traffic, it still continues dual watch. The speech is heard
intermittently. If you are annoyed with the intermittence, turn off the dual watch
by pressing the PTT switch on the handset or pressing the SHIFT and 9 DW key
again.
1.2.10 Scanning
The receiver scans all channels at intervals of 0.15 seconds in the selected
channel mode in ascending channel order, watching CH16 between channels as
below:
1 16 2 16 3 16 4...
16
88 16 87 16 86 16...
To start scanning, press the SHIFT and 8 SCAN in that order. When the receiver
finds a signal, scanning is stopped on that channel and starts dual watch on it
and CH16.
To turn off the scanning, press the PTT switch or press the SHIFT and 8 SCAN
key.
1.2.11 Remarks on voice communications
Automatic acknowledge (DSC operation) is automatically changed to manual
acknowledge when voice communications begin. (The “auto” indication, however,
remains on the screen.) This is done to prevent a break in communications.
Automatic acknowledge is automatically restored once voice communications
are terminated.