Cobra Electronics MRF45 owner manual Maintenance Troubleshooting, Specifications

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Maintenance And

Troubleshooting

Operating Your Radio

Maintenance

•

Very little maintenance is required to keep your CobraMarine VHF radio in good operating condition.

■Keep the radio clean by wiping with a soft cloth and mild detergent. Rinse with fresh water. Do not use solvents or harsh or abrasive cleaners, which could damage the case or scratch the LCD screen.

■If the radio is exposed to salt water, rinse it in fresh water at least once a day to prevent build-up of salt deposits, which could interfere with button operation.

Troubleshooting		•
		•

Problem	Possible Cause(s)	Solution(s)

No display on LCD when	Improper power	Insure power connections
radio is turned On	connection	are proper and secure

Will transmit at	Selected channel is	Switch to
one (1) watt, but not	limited to one (1) watt	another channel
at 25 watts

Will not transmit	Selected channel is	Switch to
	limited to receive only	another channel

No sound from speaker	Volume level is too low or	Readjust volume
	squelch level is too deep	and squelch

No answer to calls	Out of range of	Switch to high power
	other station	(25 watts) or move closer
	Signal is blocked	Move until you have
	by terrain	a “line-of-sight” to
		the other station

DSC distress	MMSI	Enter your MMSI number
cannot be sent	(DSC self-identification)
	number is not entered

Operating Your Radio	Specifications
Specifications	•
	•
General

Number of Channels	All U.S.A., Canadian, International and all
	NOAA Weather Channels
Channel Spacing	25 kHz
Modulation	5 kHz Max.
Input Voltage	13.8 VDC
Current Drain:
Stand-by	20 mA
Receive	200 mA
Transmit	5A @ High power 1A @ Low
Temperature Range	-20˚ C to 60˚ C
Unit Dimensions	6.25" x 2.25" x 7.125"
	(15.9 cm x 5.7 cm x 18 cm)
Unit Weight	2 lbs., 6.8 oz. (1100 g)

Receiver
Frequency Range	156.050 to 163.275 MHz
Receiver Type	Double Conversion Super-Heterodyne
Sensitivity:
20 dB Quieting	0.35 uV
12 dB Sinad	0.30 uV
Adjacent Channel Selectivity	-60 dB
Intermodulation and Rejection	-60 dB
Spurious and Image Rejection	-60 dB
AF Output	4 Watts @ 8 Ohms

Transmitter
Frequency Range: TX	156.025 to 157.425 MHz
RF Output Power	1 and 25 Watts
Spurious Emissions	-60 dB High -55 dB Low
Microphone Type	Electret
Frequency Stability	+/-10 ppm
FM Hum and Noise	40 dB


66 English		Nothing Comes Close to a Cobra® 67

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Contents Our Thanks ToYou Customer Assistance For Assistance In The U.S.AFor Assistance Outside The U.S.A Microphone Product Features Product FeaturesMicrophone With Auxiliary Controls Table Of Contents Important Safety Information Important Safety InformationSafety Training Information Always use only Cobra authorized accessoriesFCC Licensing Information Recommendations For Marine CommunicationVHF Marine Radio Procedures VHF Marine Radio Procedures Maintain Your WatchVoice Calling Voice CallingMaritime Mobile Service Identity Mmsi Maritime Mobile Service Identity MmsiDigital Selective Calling DSC Digital Selective Calling DSCEmergency Messages Distress Procedure Emergency Messages And Distress ProcedureRadiotelephone Calls Radiotelephone CallsMarine Distress Procedure Marine Distress Procedure DSCTell where you are SayVHF Marine Channel Assignments VHF Marine Channel AssignmentsInternational Distress, Safety and Calling 156.700 Rx Only 156.750156.800 156.850 03A Government Only20A Port Operations Port Operations, Ship Movement 21A U.S. Government Only Canada Coast Guard Only23A Government Only 64A U.S. Government Only Canada Commercial Fishing Digital Selective Calling Voice communications not allowed81A U.S. Government Only Environmental Protection Operations World City Time Zones Noaa Weather Channels AlertWorld City Time Zones Noaa Weather Channels And AlertMounting Powering The Radio Mounting And Powering The RadioIncluded In This Package Included In This PackageElectrical Power Connection Microphone BracketFlush Mount Kit Not Included Installation Requirements Antenna Requirements And AttachmentRadio Operator Requirements Safe Maximum Permissible Exposure MPE RadiusExternal Devices Connections External Devices And ConnectionsGlobal Positioning System GPS Device Not Included Microphone AttachmentTones And Alarms Power On-OffGetting Started Getting StartedVolume Standby And ReceiveSquelch Set-Up Routines Settings Menu Set-Up RoutinesLCD Backlight LCD ContrastTo Set Your Radio For The Area In Which You Will Be Using It A./International/Canada Channel MapsTransmit Power Output Voice TransmissionVoice Transmission ChannelsWeather Radio And Alert Advanced OperationNoaa All Hazards/Weather Radio And Alert Advanced OperationDual-Watch ScanDSC Set-Up DSC Set-UpUser Mmsi Number If You Incorrectly Enter Your Mmsi NumberIfYou TransferYourRadioTo a DifferentVessel Group Mmsi NumberDSC Scanning Position Request Reply Type Individual DirectoryTo Set The Position Request Reply Type To Enter Or Edit Names And Mmsi Numbers In The DirectoryDSC Operation DSC OperationSending Distress Calls Receiving Distress Calls Sending An All Ships CallsRegarding Distress Relay Calls Receiving Distress Relay CallsReceiving An All Ships Call Sending An Individual CallSending a Geographical Call Receiving a Geographical CallReceiving An Individual Call Receiving a Group CallSending a Group Call Sending a Position RequestTo Exit The Position Request Mode If You Receive a PositionIf The Station You Called Cannot Send Its Position If The Station You Called Chose Not To ReplyReceiving a Position Request Sending a Position SendReceiving a Position Send Maintenance Troubleshooting SpecificationsMaintenance TroubleshootingProduct Service Accessories Order Info Optional Accessories