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10 Northstar Explorer VHF Series: 721US, 721EU Operation and Installation Manual
1-7 Basic Operation and Key Functions
All possible keys on the base unit, the microphone, and the optional handset are listed and their functions
are explained.
NOTE: Some keys or functions may not be available on your particular model of base unit, microphone, or optional
handset. This example shows the 721US base unit.
Key Function
VOL PWR Volume and Power. Turn clockwise to power on. Continue to turn until a comfortable
volume is reached. VOL/PWR will also adjust the settings of an external speaker, if
connected.
SQL Squelch or Threshold Level. Sets the threshold level for the minimum receiver
signal. Turn fully counterclockwise until random noise is heard, then turn slowly
clockwise until the random noise disappears. Make another 1/4 turn clockwise for
best reception in open sea conditions.
In areas of high noise (eg close to large cities) reception may improve if sensitivity
is reduced. Either turn SQL slowly clockwise or use the LOCAL setting. See section
2.4.
DISTRESS Send DSC Distress Call. See Section 6.
16/9 Priority Channel. 721US only. Press to cancel all other modes and to tune into the
priority channel. Press again to return to your original channel.
The default is Channel 16. To make Channel 09 the priority channel, hold down 16/9
until a beep sounds and 09 is displayed.
16 Priority Channel. 721EU only. Press to cancel all other modes and to tune into the
priority channel, Channel 16, on high power. Press again to return to your original
channel.
3 CH Three Favorite Channels. Press to toggle between your favorite channels. The
CH1, CH2, or CH3 symbol appears on the LCD to show which favorite channel is
selected.
To scan only one of your favorite channels, press 3CH then immediately press and
release SCAN. If you want to scan all three favorite channels, press 3CH then im-
mediately press and hold SCAN.
Explorer 721