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55Northstar Explorer VHF Series: 721US, 721EU Operation and Installation Manual
Section 7 - Install the Explorer 721
7-1 Installation Options
There are two ways to install the radio. You can choose:
• a deck or overhead mounted gimbal installation. The reversible mounting gimbal is fi xed to to a suitable
site and the radio is placed into it. The radio can be removed for storage and the viewing angle can be
adjusted.
• a recessed installation. The radio is recessed into a cavity cut into a bulkhead. The radio fi xture is permanent
and the viewing angle cannot be adjusted.
NOTE: An optional handset with a 9.8` (3 m) docking cable included can be purchased and connected to your
Explorer 721 base unit to give second station operation and intercom capability. The optional 701US handset
(for the Explorer 721US) and the optional 701EU handset (for the Explorer 721EU) are shown on the front cover.
7-2 Location Requirements
Please check these BEFORE doing any cutting or drilling.
Whichever installation method you choose, ensure that the chosen location:
• is at least 3' (1 m) from the antenna
• allows easy connection to (at least) a 10 Amp fused 13.6 V DC electrical source and the antenna
• is at least 1.5' (45 cms) from the compass to avoid creating magnetic deviation of the compass during
radio operation
• has a suitable space close by for installing the microphone bulkhead mount
• provides easy access to the controls on the front panel
• provides reasonable access to the wiring at the back of the radio
• provides enough room to fi x the DSC warning label (721US only).
7-3 Checklist
The following items should be supplied in the box. Check before starting the installation and contact your
dealer if an item is missing.
NOTE: An antenna is NOT provided. Consult your Northstar dealer for advice if necessary.
1. Mounting gimbal for the VHF radio
2. Power supply cable with inbuilt 7 Amp fuse
3. External speaker connection cable with white (+) wire and black (-) wire
4. GPS connection cable
5. Two mounting knobs
6. Microphone bulkhead mount
7. Four self-tapping screws for the mounting gimbal
8. Four fl at screws for the mounting gimbal
9. Four spring washers for the mounting gimbal
10. Four plain washers for the mounting gimbal
11. Four nuts for the mounting gimbal
12. Two self-tapping screws for the microphone bulkhead mount