NorthStar Navigation Explorer 721US, Explorer 721EU Channel Naming Yes, Transmitter

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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 @ 2.5 W
Modulation distortion:	Less than 4% @ 1 kHz for a +/-3 kHz deviation
RECEIVER
Frequency:	156.025 - 163.275 MHz
12 dB SINAD sensitivity:	0.25 uV (distant) / 2.5 uV (local)
Adjacent CH selectivity:	more than 70 db
Spurious response:	more than 70 db
Intermodulation rejection ratio:	more than 68 db
Residual Noise level:	more than -40 db unsquelched
Audio output power:	2 W (with 8 ohm at 10% distortion)
	4 W with 4 ohm external speaker
Compass safe distance:	1.5' (0.5 m)

Speciﬁ cations are subject to change without notice.

40	Northstar Explorer VHF Series: 721US, 721EU Operation and Installation Manual

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Contents Explorer 721US / 721EU Important Safety Information Contents Send and Receive DSC Calls Industry Canada Features How to Display and Navigate MenusGeneral Information Customize your Northstar VHF RadioLCD Symbols and Meanings How to Enter or Change Alphanumeric DataNormal Menu Mode Edit Mode Push Space Symbol How the Microphone and Optional Handset Work Together Basic Operation and Key Functions CH2 or CH3 symbol disappears oﬀ the LCD Weather alert mode is onMenu see and the DSC set up menu see Section Then push to backupPower transmission setting is incorrect Complete listing of channel chartsMatically exits you from menu mode and stops scanning You must release PTT to receive a signalRadio Menu Options Menu Show Weather, SNR or Happy Fish on Handset Info Data Add an Entry Maintain Your Buddy List Buddy ListEdit an Entry Local or Distance Sensitivity LOCAL/DIST Set Distance SensitivitySet Local Sensitivity Backlighting Backlight and Contrast ContrastSet the Backlighting Level Set the Contrast LevelGPS Data and Time GPS/DATA Manually Enter Position and UTC Time ManualLocal Time Time Offset GPS/DATA Manual SettingTime Offset Select GPS/DATA, then Setting Select LL Display Time Display Options Time DisplayPosition Display Options LL display Course & Speed Display Options COG/SOGReset to Factory Defaults Reset GPS Alert Options AlertGPS Simulator GPS SIM Select GPS SIM, then select on or OFF as desiredRadio Setup Menu Options Radio Setup Radio Setup Menu Radio SetupSelect the Channel Bank UIC Change Channel Names CH Name Ring and Beep Volume Ring Volume and KEY BeepInternal Speaker Connections INT Speaker Set the Priority Channel Watch Mode Select Radio SETUP, then WX AlertWeather Alert WX Alert Nmea or Navbus protocol COM PortSelect Radio SETUP, then COM Port Select Baro & Temp Barometric Displays Baro SensorSwitch the Barometric Display on or OFF Baro Disply Temperature Display TemperatureSet the Temperature Units Units Calibrate the Temperature Reading CALDSC Setup Menu DSC Setup Menu OptionsMaintain Your Groups Group Setup Create a Group Group SetupEdit Group Name or Group Mmsid Response to Individual Calls Indiv ReplyAtis Mmsid & Atis Functionality Enable Atis Functionality Atis FuncEnter or Edit Your Atis Mmsid Select DSC SETUP, then LL Reply DSC Functionality DSC FuncResponse Type to LL Polling Calls LL Reply Push the rotary knob to conﬁrmSend and Receive DSC Calls What is DSC?DSC Call Menu Options Distress only when there’s a distress situation Call an Individual IndividualRetry a Routine Call Acknowledge an Individual Incoming CallCall the Most Recent Caller Last Call Call a Group GroupCall All Ships ALL Ships This facility is useful and used frequentlyCall using the Distress Log Dist LOG Call using the Call Log Call LOGSet the channel and continue as explained in Section Request the LL Position of a Buddy LL Request Track Your Buddy Track BuddyDSC Call Call LOG Dist LOG LL Request SET Buddy BUDDY1 On OFFReceive an All Ships Call RCV ALL Ship Receive an Individual Call RCV IndivReceive a Geographic Call RCV Geograph Receive a Group Call RCV GroupReceive a Polled Position Call Rcvposition Distress Calls Send a Distress CallReceive a Distress Acknowledgement Distress ACK Open the red cover labelled DistressReceive a Distress Relay RCV Distress Relay Receive a Distress Call RCV DistressRelay a Distress Call from the Distress Log Relay Appendix a Technical Specifications Northstar Explorer 721US and 721EUGPS/NMEA input Yes Comm. port Baud NMEA, 38400 baud Navbus Rotary channel selector YesChannel Naming Yes TransmitterAppendix B Troubleshooting Appendix C VHF Marine Channel Charts International EU-DSC onSpecial Notes on International Channel Useage Page USA Channel Chart Send Receive Traffic Type Ship Name TAG Wx01 RX Only 162.550 Wx02 RX Only 162.400Wx03 RX Only 162.475 Wx04 RX Only 162.425Canada Channel Chart 28B RX Only 162.000 Public Correspondence, RX Only 156.025 160.625 Public Correspondence, Duplex Yes62A 156.125 Canadian Coast Guard Yes 156.225 160.825 Public Correspondence, Duplex YesWeather EU Inland Waterway Channels Country Specific Digital selective calling for distress162 156.85AIS Page Appendix D Mmsid and License Information Install the Explorer Installation OptionsChecklist There are two ways to install the radio. You can chooseGimbal Installation Recessed Installation Change the Viewing AngleInstall the Microphone Bulkhead Mount Drill the two pilot screw holes where markedConnectors are on the rear of the base unit, as follows Connect the Radio CablesSet Up the Radio Mmsid Store Cancel User Mmsid Input AgainEnter Your User Mmsid GND. a ground connection is not usually requiredCompleted Installation with Optional Handset 0560

Channel Naming:

Yes

TRANSMITTER

RECEIVER