Explorer 721US / 721EU VHF Marine Radio Operation and Installation Manual www.northstarnav.
IMPORTANT SAFETY INFORMATION Please read carefully before installation and use. This is the safety alert symbol. It is used to alert you to potential personal injury hazards, Obey all safety messages that follow this symbol to avoid possible injury or death. WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury CAUTION indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury.
Contents Section 1 - General Information ...............................................................................................................6 1-1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1-2 Customize your Northstar VHF Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1-3 How to Display and Navigate Menus . . . . . . . . . . . . .
-7 Response Type to LL Polling Calls (LL REPLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 4-8 Mute the Notification Ring Tone (LL RING) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 Section 5 - Send and Receive DSC Calls ..................................................................................................... 30 5-1 What is DSC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-7 Install the Microphone Bulkhead Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58 7-8 Connect the Radio Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58 7-9 Set Up the Radio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59 7-10 Enter Your User MMSID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 1 - General Information 1-1 Features Congratulations on your purchase of a Northstar VHF Explorer 721US or 721EU marine band radio.
2. Only four menu items can be displayed at any one time on the LCD. Press CH + or CH - to scroll up and down the menu until the cursor is positioned at the desired option. Press ENT or push the rotary knob to display that option. 3. Make any entries or changes as explained in the following section. 4. Press ENT or push the rotary knob to confirm changes. Otherwise, press ESC to keep the original entry. 5. Press ESC to backup one screen or exit. Any changes are active as soon as you exit the screen.
These symbols may not appear at all or may be shown in a different location on the optional handset. Symbol Meaning TX Transmitting. HI LO Transmission power. High (HI) 25 W or Low (LO) 1 W. WX Weather channel. WX ALT Weather Alert. Alarm beeps will sound. 721US only. BUSY Receiver busy with an incoming signal. PRI Priority channel is selected. D Duplex operation. Otherwise, blank for Simplex operation. LOCAL Local calling is selected. Otherwise, blank for distance calling.
Baro Graph. A histogram of barometric pressure readings over the past 24 hours. The high-resolution histogram centers automatically if the range goes off scale. Readouts are taken even when the engine and radio have been powered down (with typically less than 3mA of current drain). A typical operational display on base unit LCD: A transmission on Channel 16 is being made at high power using the International channel bank. Channel 16 is set as the Priority channel.
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. Explorer 721 Key Function VOL PWR Volume and Power. Turn clockwise to power on. Continue to turn until a comfortable volume is reached.
To add a favorite channel for the first time, select that channel then hold 3CH to store it in the CH1 location. Repeat the procedure to store two more favorite channels in the CH2 and CH3 locations respectively. If you try and add another favorite channel it will overwrite the existing CH3. CH1 and CH2 remain unless you delete them. To delete a favorite channel, select that channel then hold down 3CH until the CH1, CH2 or CH3 symbol disappears off the LCD. SCAN Scan.
info Information. Press on the base MIKE to toggle through the INFO display to show the barometric historgram, the barometric readout and temperature, or the Signalto-Noise Ratio (SNR). H/L Transmission Power. High (HI) 25 W or Low (LO) 1 W. Press to toggle between high or low transmission power for the entire channel bank. The HI or LO selection is shown on the LCD. Some channels allow only low power transmissions. Error beeps will sound if the power transmission setting is incorrect.
Section 2 - The Radio Menu (MENU) Hold down CALL/MENU to show the radio menu options. Sections 1-3 and 1-4 explain how to navigate around the menu and enter, save and change data. 2-1 The Radio Menu Options (MENU) Show weather, SNR or Happy Fish information on the handset. INFO DATA (Handset only) y See Section 2-2. BUDDY LIST Maintain your buddy list. Set radio sensitivity. LOCAL/DIST See Section 2-3. See Section 2-4. BACKLIGHT Set backlight level. Set contrast level. CONTRAST See Section 2-5.
2-2 Show Weather, SNR or Happy Fish on Handset (INFO DATA) If you have the optional handset installed, you can use INFO DATA to show the local weather forecast (e.g. SUNNY) and a digital readout of the current barometric pressure (mb or in-Hg) and the channel name on the handset LCD. MENU SELECT >INFO DATA BUDDY LIST LOCAL/DIST INFO DATA >ON OFF DISTRESS A BIT CLOUDY 78.4°F 29.
2-3 Maintain Your Buddy List (BUDDY LIST) MENU SELECT >BUDDY LIST LOCAL/DIST BACKLIGHT Use the Buddy List to store the names and associated MMSIDs of 20 favorite people. Names are stored in the order of entry, with the most recent entry shown first. The following sections show to use BUDDY LIST to add, edit, and delete entries in your buddy list. Section 3 explains how to call a buddy.
2-3-3 Delete an Entry BUDDY LIST > MANUAL NEW ALEX TOM BUDDY LIST > MANUAL NEW ALEX TOM TOM > EDIT DELETE DELETE BUDDY TOM > YES NO 1. Select BUDDY LIST. Press ENT or push the rotary knob to display the list of entries. 2. Scroll down (if required) to the entry you want to delete and press ENT. 3. Select DELETE then select YES. 4. The entry is deleted immediately and the buddy list is displayed again.
2-5-1 Set the Backlighting Level BACKLIGHT LO HI PRESS ENT 1. Select BACKLIGHT. 2. Use CH + or CH - to select a comfortable backlight level. 3. Press ENT or push the rotary knob to confirm the new level and return to the menu. 2-5-2 Set the Contrast Level CONTRAST LO HI PRESS ENT 1. Select CONTRAST. 2. Use CH + or CH - to select a comfortable contrast level. 3. Press ENT or push the rotary knob to confirm the new level and return to the menu.
2-6-2 Local Time (TIME OFFSET) The local time can be set by entering the time offset between UTC and local time as follows. GPS/DATA MANUAL >SETTING GPS/DATA > TIME OFFSET TIME FORMAT TIME DISPLY TIME OFFSET >+01:30 02:30PM LOC 1. Select GPS/DATA, then SETTING. 2. Select TIME OFFSET to enter the difference between UTC and local time. Half hour increments can be used with a maximum offset of ±13 hours. In this example, a difference of +1.
2-6-3 Time Format Options (TIME FORMAT) Time can be shown in 12 or 24 hour format. GPS/DATA MANUAL > SETTING SETTING TIME OFFSET > TIME FORMAT TIME DISPLAY TIME FORMAT > 12 Hr 24 Hr 07:15AM LOC 1. Select GPS/DATA, then SETTING. 2. Select TIME FORMAT. 3. Select 12 Hr or 24 Hr as desired. In this example, 12 hour format has been selected so the LCD shows the AM or PM suffix.
2-6-7 GPS Alert Options (ALERT) The GPS alert is usually set to ON so that if the GPS navigation receiver is disconnected, the alarm sounds. 1. GPS/DATA LL DISPLY COG/SOG > GPS ALERT GPS ALERT > ON OFF Select GPS/DATA, then SETTING. 2. Select GPS ALERT. 3. Select ON or OFF as desired. 2-7 GPS Simulator (GPS SIM) The GPS Simulator is set to OFF whenever the radio is turned ON or whenever real GPS data is available through the COM port.
Section 3 - Radio Setup Menu (RADIO SETUP) Hold down CALL/MENU then scroll down and select RADIO SETUP. Press ENT or push the rotary knob to show the RADIO SETUP menu options. Sections 1-3 and 1-4 explain how to navigate around the menu and enter, save and change data. 3-1 The Radio Setup Menu Options (RADIO SETUP) UIC (721US only) Select the channel bank (721US only) See Section 3-2. CH NAME Edit or delete channel names. See Section 3-3.
3-3 Change Channel Names (CH NAME) The channel charts are listed in Appendix C with their default name tags. CH NAME gives you the option to edit or delete the channel name tags displayed on the screen. RADIO SETUP > CH NAME RING VOLUME KEY BEEP EDIT CH NAME TELEPHONE TELEPHONE > EDIT DELETE 01 CH NAME TELEPHONE SAVE CH NAME PHONE1 > YES NO 1. Select RADIO SETUP, then CH NAME. 2.
3-6 Set the Priority Channel (WATCH MODE) If you have the 721EU, watch mode is similar to a dual watch, scanning between the priority channel and the working channel. CH16 is the priority channel. If you have the 721US and are operating on USA or Canadian channel banks, you can set the priority channel to cover both CH16 and CH09 as well as the working channel, as follows: RADIO SETUP KEY BEEP INT SPEAKER > WATCH MODE WATCH MODE > ONLY 16CH 16CH+9CH 1. Select RADIO SETUP, then WATCH MODE. 2.
3-8-2 NAVMAN GPS data source (GPS SOURCE) RADIO SETUP WATCH MODE WX ALERT > COM PORT COM PORT NMEA > GPS SOURCE BARO & TEMP GPS SOURCE NMEA > NAVBUS GPS SOURCE NAVBUS > ON OFF 1. Select RADIO SETUP, then COM PORT. 2. Select GPS source, then select NAVBUS. 3. The cursor is at ON. Press ENT or push the rotary knob to confirm the setting and return to the menu. 3-8-3 Use the 721 as barometric pressure and temperature data source (BARO & TEMP) RADIO SETUP WATCH MODE WX ALERT > COM PORT 1.
3-9-2 Switch the Barometric Display ON or OFF (BARO DISPLY) RADIO SETUP WX ALERT COM PORT > BARO SENSOR 1. 2. 3. BARO SENSOR BARO UNITS > BARO DISPLY BARO CAL. BARO DISPLY > LCD OFF LCD ON Select RADIO SETUP, then BARO SENSOR. Select BARO DISPLY. The cursor is at LCD OFF. Press ENT or press the rotary knob to switch OFF the barometric display on the base unit, or select LCD ON to show the barometric display on the base unit. IMPORTANT: LCD OFF is the default.
Section 4 - DSC SETUP Menu A valid user MMSID must be entered to access the DSC functions. If you don’t have a user MMSID, see Appendix D. Hold down CALL/MENU then scroll down and select DSC SETUP. Press ENT or push the rotary knob to show the following DSC SETUP menu options. Sections 1.3 and 1.4 explain how to navigate around the menu and enter, save and change data. 4-1 DSC SETUP Menu Options USER MMSID Check your user MMSID. See section 4.2. To enter your user MMSID for the first time, see Section 7-9.
GROUP SETUP > MANUAL NEW 000000000 DSC SETUP USER MMSID > GROUP SETUP INDIV REPLY GROUP NAME –––––––––––– GROUP MMSID 0–––––––– FISHER1 012345678 > STORE CANCEL If you make an error, select < and press ENT to backup and correct the entry (721US) or CLR and ENT (721EU). 4. Enter the group MMSID. The first number is always 0. Press ENT or push the rotary knob to confirm the entry. 5. The group name and group MMSID are shown in a confirmation screen.
conversation. A manual response asks if you want to acknowledge the call, and then asks if you want to converse with the caller. DSC SETUP USER MMSID GROUP SETUP > INDIV REPLY INDIV REPLY > AUTO MANUAL 1. Select DSC SETUP, then select INDIV REPLY. 2. The cursor is at AUTO. Press ENT or press the rotary knob for an automatic response, or select MANUAL for a manual response. 4-5 ATIS MMSID & ATIS Functionality 721EU only.
DSC SETUP INDIV REPLY ATIS MMSID > ATIS FUNC ATIS FUNC > ON OFF It’s not possible to have both ATIS ON and DSC ON simultaneously. When you enable one, the other will turn OFF. If DSC and ATIS are both OFF, you must turn DSC ON for normal DSC operation. The annunciator on the LCD shows you the current mode: if the DSC annunciator is shown, DSC is operational; if the ATIS annunciator is shown, ATIS is operational.
Section 5 - Send and Receive DSC Calls A valid user MMSID must have been entered to access the DSC functions. If you don’t have a user MMSID, see Appendix D. Press CALL/MENU to show the DSC CALL menu. This shows the different types of DSC call that you make. Sections 1.3 and 1.4 explain how to navigate around the menu and enter, save and change data. 5-1 What is DSC? DSC (Digital Selective Calling) is a semi-automated method of establishing VHF, MF, and HF radio calls.
5-3 Call an Individual (INDIVIDUAL) INDIVIDUAL > ROUTINE SAFETY URGENCY ROUTINE > MANUAL NEW BUDDY1 BUDDY2 MANUAL MMSID 0–––––––– 012345678 INDIVIDUAL ROUTINE > SET CHANNEL 012345678 INDIVIDUAL ROUTINE > SEND? 12345678 INDIVIDUAL ROUTINE CALLING... 012345678 INDIVIDUAL ROUTINE WAITING ACK INDIV ACK 012345678 PRESS PTT ESC –> EXIT You can call anyone who has a radio with DSC functionality. You can set the priority level of the DSC call to routine, safety, urgency, or distress.
5-4 Call the Most Recent Caller (LAST CALL) EXPLORER 721 INDIVIDUAL ROUTINE 10:22AM LOC DSC CALL INDIVIDUAL > LAST CALL GROUP EXPLORER 721 INDIVIDUAL ROUTINE > SET CHANNEL EXPLORER 721 INDIVIDUAL ROUTINE > SEND? This facility is useful and used frequently. 1. Press CALL/MENU to enter the DSC CALL menu. LAST CALL is automatically selected. Press ENT or push the rotary knob to display the contact details of the most recent incoming call. 2. Select the working channel.
select the correct channel. 3. The radio asks for confirmation of the ALL SHIPS call (SEND?). Press ENT or push the rotary knob to select YES and send the call, and continue as explained in Section 5-3.
5-9 Request the LL Position of a Buddy (LL REQUEST) DSC CALL CALL LOG DIST LOG > LL REQUEST LL REQUEST > SAM VHF721 BUDDY #3 SAM LL REQUEST > SEND? SAM LL REQUEST CALLING... channel name SAM LL REQUEST AWAITING ACK 1. Press CALL/MENU to enter the DSC CALL menu, then select LL REQUEST. 2. Select the buddy whose LL position you want to request then press ENT or push the rotary knob to send the request. 3.
Start Tracking as follows: DSC CALL DIST LOG LL REQUEST > TRACK BUDDY TRACK BUDDY > START TRACK SET BUDDY TRACKLIST START TRACK BUDDY1 OFF BUDDY2 ON BUDDY3 OFF START TRACK > YES NO PRESS ENTER 1. Press CALL/MENU to enter the DSC CALL menu, then select TRACK BUDDY. 2. Select START TRACK, then select YES. The START TRACK display changes to STOP TRACK. To stop tracking at any time, just select YES.
5-12 Receive a Group Call (RCV: GROUP) RCV: GROUP GP: RD GROUP VHF721 ROUTINE When you receive notification of a GROUP call, press any key to cancel the alert. The radio automatically selects the channel designated in the incoming call. The priority level is always routine, and the group is identified on the screen. The group will be one of the three groups of frequently called people that you set up earlier (see Section 4-3). You don’t need to send an acknowledgement.
Section 6 - Distress Calls A valid user MMSID must have been entered to access this DSC function. If you don’t have a user MMSID, see Appendix D. IMPORTANT: This Northstar radio is designed to generate a digital maritime distress call to facilitate search and rescue. To be effective as a safety device, this radio must be used only within the geographic range of a shore-based VHF marine Channel 70 distress and safety watch system.
6-2 Receive a Distress Call (RCV: DISTRESS) RCV: DISTRESS 123456789 FLOODING ESC –> EXIT An alert sounds when a distress call (DISTRESS!) is received. Press any key to cancel the alert. You don’t need to send an acknowledgement. RCV: DISTRESS 10:34 UTC 82º50.003'N 27º45.543'W The radio automatically selects CH16 and displays the details of the distress call on the screen. Press PTT to establish voice contact. The details are displayed over two screens that alternate every 1.
Appendix A - Technical Specifications Northstar Explorer 721US and 721EU GENERAL Power Supply: 13.6 V DC. Current drain: Transmit 6 A at 25 W Tx / 1.
Channel Naming: Yes Tri watch, favorite channel scan: Yes All scan: Yes User programmable MMSID: Yes (User MMSID and ATIS (721EU) MMSID and NAME directory: Yes - 20 numbers & group TRANSMITTER Frequency: 156.025 - 157.425 MHz Output power: 25 W / 1 W selectable Transmitter protection: Open / short circuit of antenna Max Freq deviation: +/- 5 kHz Spurious & harmonics: better than @ 2.
Appendix B - Troubleshooting 1. The transceiver will not power up. A fuse may have blown OR there is no voltage getting to the transceiver. a) Check the power cable for cuts, breaks, or squashed sections. b) After checking the wiring, replace the 7 Amp fuse (a spare fuse is supplied). c) Check the battery voltage. This must be greater than 10.5 V. 2. The transceiver blows the fuse when the power is switched on. The power wires may have been reversed.
Appendix C - VHF Marine Channel Charts C.1 International (EU-DSC ON) EU countries have special channeling requirements and the radio is cloned to match the market requirements. NOTE For assistance in understanding the Table, see notes a) to o) below.
Channel designator Transmitting frequencies MHz Notes Ship stations 16 156,800 76 n) 156,825 17 g) 156,850 77 Coast stations 78 Port operations and ship movement Single frequency Public correspondence Two frequency 156,800 DISTRESS, SAFETY AND CALLING 156,850 x x 156,875 m) 18 Intership x x 156,900 161,500 156,925 161,525 x x x x x 19 156,950 161,550 x x 79 156,975 161,575 x x 20 157,000 161,600 x x 80 157,025 161,625 x x 21 157,050 161,650 x x
d. The frequencies in this Table may also be used for radiocommunications on inland waterways in accordance with the conditions specified in No. 5.226. – 56 – 62238 IEC:2003(E) e. Administrations having an urgent need to reduce local congestion may apply 12,5 kHz channel interleaving on a non-interference basis to 25 kHz channels, provided: – Recommendation ITU-R M.
C.2 USA Channel Chart CH SEND (MHz) 01A 03A 4 05A RECEIVE (MHz) TRAFFIC TYPE SHIP SHIP NAME TAG TO TO SHIP SHORE 156.050 156.050 Port Operations, Selected VTS Areas Yes Yes 156.150 US Government, Coast Guard Yes Yes UNAUTHORIZED 156.250 156.250 Port Operations, Selected VTS Areas Yes Yes PORT OPS/VTS 06 156.300 156.300 Inter-ship Safety Yes No SAFETY 07A 156.350 156.350 Commercial Yes Yes COMMERCIAL 08 156.400 156.
CH SEND (MHz) RECEIVE (MHz) TRAFFIC TYPE SHIP SHIP NAME TAG TO TO SHIP SHORE 61A 4 156.075 156.075 U.S. Government, Canadian Coast Guard Yes Yes UNAUTHORIZED 63A 156.175 156.175 Port Operations, VTS in Selected Areas Yes Yes PORT OPS/VTS U.S. Government, Canadian Commercial Fishing Yes Yes UNAUTHORIZED PORT OPS 64A 4 156.225 156.225 65A 156.275 156.275 Port Operations Yes Yes 66A 156.325 156.325 Port Operations Yes Yes PORT OPS 67 3 156.375 156.
WEATHER MHz TRAFFIC TYPE Wx01 RX Only 162.550 NOAA WEATHER CHANNEL ------ ------ NOAA WX NAME TAG Wx02 RX Only 162.400 NOAA WEATHER CHANNEL ------ ------ NOAA WX Wx03 RX Only 162.475 NOAA WEATHER CHANNEL ------ ------ NOAA WX Wx04 RX Only 162.425 NOAA WEATHER CHANNEL ------ ------ NOAA WX Wx05 RX Only 162.450 NOAA WEATHER CHANNEL ------ ------ NOAA WX Wx06 RX Only 162.500 NOAA WEATHER CHANNEL ------ ------ NOAA WX Wx07 RX Only 162.
C-3 CANADA Channel CHART CH SEND (MHz) RECEIVE (MHz) TRAFFIC TYPE SHIP SHIP TO NAME TAG SHORE TO SHIP 01 156.050 160.650 Public Correspondence, Duplex No Yes 02 156.100 160.700 Public Correspondence, Duplex No Yes TELEPHONE 03 156.150 160.750 Public Correspondence, Duplex No Yes TELEPHONE TELEPHONE 04A 156.200 156.200 Canadian Coast Guard, SAR Yes Yes CANADIAN CG 05A 156.250 156.250 Port Operations, VTS in Selected Areas Yes Yes PORT OPS/VTS 06 156.300 156.
CH SEND (MHz) RECEIVE (MHz) TRAFFIC TYPE SHIP SHIP TO NAME TAG TO SHORE SHIP 28B RX Only 162.000 Public Correspondence, RX Only ------ ------ TELEPHONE 60 156.025 160.625 Public Correspondence, Duplex No Yes TELEPHONE 61A 4 156.075 156.075 U.S. Government, Canadian Coast Guard Yes Yes UNAUTHORIZED 62A 156.125 156.125 Canadian Coast Guard Yes Yes CANADIAN CG 64 156.225 160.825 Public Correspondence, Duplex No Yes TELEPHONE 64A 4 156.225 156.225 U.S.
WEATHER MHz TRAFFIC TYPE Wx01 RX Only 162.550 NOAA WEATHER CHANNEL ------ ------ NOAA WX NAME TAG Wx02 RX Only 162.400 NOAA WEATHER CHANNEL ------ ------ NOAA WX Wx03 RX Only 162.475 NOAA WEATHER CHANNEL ------ ------ NOAA WX Wx04 RX Only 162.425 NOAA WEATHER CHANNEL ------ ------ NOAA WX Wx05 RX Only 162.450 NOAA WEATHER CHANNEL ------ ------ NOAA WX Wx06 RX Only 162.500 NOAA WEATHER CHANNEL ------ ------ NOAA WX Wx07 RX Only 162.
C-4 EU INLAND WATERWAY CHANNELS - Country Specific For specific channel information for your country, please refer to local authorities. CH SPECIFIC FOOTNOTES TRANSMITTING FREQUENCY (MHZ) SHIP-TO-SHIP SHIP-TOPORT NAUT.INFORM SHIP LAND 60 a) 156.025 160.625 x 1 a) 156.05 160.65 x 61 a) 156.075 160.675 x 2 a) 156.1 160.7 x 62 a) 156.125 160.725 x 3 a) 156.15 160.75 x 63 a) 156.175 160.775 x 4 a) 156.2 160.8 x 64 a) 156.225 160.825 x 5 a) 156.25 160.
17 h) 156.85 156.85 77 a) k) 156.875 156.875 18 156.9 161.5 78 156.925 161.525 x 19 156.95 161.55 x 79 a) x 156.975 161.575 x 20 157 161.6 x 80 157.025 161.625 x x 21 a) 157.05 161.65 81 a) 157.075 161.675 x 157.1 161.7 x 22 82 l) m) 157.125 161.725 x 23 m) 157.15 161.75 x 83 a) m) 157.175 161.775 x 24 m) 157.2 161.8 x 84 m) 157.225 161.825 x 25 m) 157.25 161.85 x 85 a) m) 157.275 161.875 x 26 m) 157.3 161.
1.1 General remarks to frequency table 1 1.1.1 The channels for service categories ship-to-ship and nautical information may also be used for vessel traffic-systems by traffic centres. 1.1.2 In some countries, frequencies certain channels are used for another service category or other radio services.
Appendix D - MMSID and License Information You must obtain a user MMSID (Marine Mobile Service Identity) and enter it into your radio in order to use the DSC functions. Contact the appropriate authorities in your country. If you’re unsure who to contact, consult your Northstar dealer. The user MMSID is a unique nine digit number, similar to a personal telephone number. It is used on marine transceivers that are capable of using DSC (Digital Select Calling).
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 fixed 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 fixture is permanent and the viewing angle cannot be adjusted.
13. Two flat screws for the microphone bulkhead mount 14. Two spring washers for the microphone bulkhead mount 15. Two plain washers for the microphone bulkhead mount 16. Two nuts for the microphone bulkhead mount 17. Two flush-mount brackets for recessed installation 18. Two M5x32 screws for recessedinstallation 19. Two M5x10 screws for recessed installation 20. Two plastic stoppers for the recessed installation (not pictured) 21. Installation template (not pictured) 22.
4. Slide the radio into the mounting gimbal. 5. Insert the two mounting knobs through the holes and tighten them sufficiently to hold the radio at the desired viewing angle. 7-5 Change the Viewing Angle The viewing angle on the gimbal mount has a 20º tilt range. To change the current viewing angle on the gimbal mount: 1. Support the radio, then cautiously loosen the mounting knobs until the radio can be moved. 2. Re-position the radio then tighten the mounting knobs again. 7-6 Recessed Installation 1.
7-7 Install the Microphone Bulkhead Mount Hold the microphone bulkhead mount at the chosen location and use a soft pencil to mark the screw hole positions on the mounting surface. Ensure that the microphone curly cable will comfortably reach this location BEFORE you drill. Drill the two pilot screw holes where marked. 3. Use a short length Philips screwdriver and the set of two flat screws, spring washers, plain washers, and nuts to secure the microphone bulkhead mount at the location site. 4.
4. BLACK Power wire. Connect this to the NEGATIVE (-) battery terminal. 5. RED Power wire. Connect this to the POSITIVE (+) battery terminal. Check that a 10 Amp fuse is installed on this power cable close to the battery. 6. ANT. A radio antenna is not supplied. A suitable radio antenna must be mounted and connected before operating the Explorer 721 radio. Consult your dealer for advice if necessary. 7. GND. A ground connection is not usually required..
7-11 The Completed Installation (with Optional Handset) Optional Handset Wallplate on bulkhead Handset docking cable External speaker M84 Northstar GPS product VHF Antenna External speaker connection cable Antenna connection cable Fuse on RED power cable Base unit with microphone 60 Northstar Explorer VHF Series: 721US, 721EU Operation and Installation Manual BLACK power cable Battery
UNITED STATES EUROPE 30 Sudbury Road, Unit 2, Ocean Quay, Acton, MA 01720, Belvidere Rd, Southampton, United States SO14 5QY, England Ph: +1 978.897.6600 Ph: +44 2380 339922 Fax: +1 978.897.7241 Fax: +44 2380 330345 sales@bntmarine.com northstaruk@northstarnav.com AUSTRALIA NEW ZEALAND PO Box 479, PO Box 68 155, Gladesville, NSW 2111, Australia Newton, Auckland, New Zealand Ph: +61 2 9879 9000 Ph: +64 9 481 0500 Fax: +61 2 9879 9001 Fax: +64 9 481 0590 northstaraus@northstarnav.
