MT-550
17
6.4 Transmitter Power Setting
The transmitter has two power settings, 25 watts or 1 watt, which are indicated by
HI
or
LO
appearing in the upper line of the display. The normal power setting is
HI
for all channels where 25 watts is allowed. Use the 1 watt setting for
communication with nearby vessels (bridge-to-bridge) or facilities (drawbridges).
•
Press the
H/L
key to toggle transmitter power between 25 watts and 1
watt output.
SPECIAL NOTE
Channels 15, 17, 75 and 76 are restricted to 1 watt maximum power and will cause
the error beep if the
HI/LO
key is pressed.
6.5 Channel Scanning
There are three channel scanning modes; Priority Scan, All Scan and Memory Scan.
In the Priority Scan mode, Channel 16 is checked for activity every 2 seconds, even
if, the scan is halted by traffic on a working channel. When scanning is halted by
traffic, the scan pauses while the channel is active. Scanning resumes, after a brief
delay when the channel is clear. If the
PTT
is pressed, in reply to a received signal,
scanning is cancelled.
Priority Scan
The Priority Scan function scans the Primary Calling Channel and the last selected
working channel.
To select Priority Scan:
•
Press the
SCAN
key.
PSCAN
appears in the upper line of the display and
the two scanned channel numbers appear alternately in the display.
INT
PSCAN HI
08Dec12:05
P
N 28 04.814
W 83 42.169
INT
PSCAN HI
08Dec12:05
P
N 28 04.814
W 83 42.169
Priority Scan Sequence
To exit Priority Scan:
•
Press the
SCAN
key or press the
16
key.
All Scan
The All Scan function scans all channels except channel 70. Channel 70 is the
Digital Selective Calling (DSC) channel. Voice traffic is not permitted on this
channel. If noisy or busy channels interfere with scanning, the interfering channels
may be temporarily removed from the scan sequence.
To select All Scan:
•
Press and hold the
SCAN
key for 2 seconds.
ALLSCAN
appears in the upper
line of the display. The scanned channel numbers appear in sequence in the
channel number display.
