Cobra Electronics MR F75 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, and International
	10 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


70 English		Nothing comes close to a Cobra® 71

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Contents MR F75 Customer Assistance For Assistance In The U.S.A For Assistance Outside The U.S.ATable Of Contents Transceiver Controls Indicators And ConnectionsMicrophone/Speaker Product Features Safety Training Information Important Safety InformationImportant Safety Information Always use only Cobra authorized accessoriesFCC Information VHF Marine Radio Procedures Voice CallingDigital Selective Calling DSC Maritime Mobile Service Identity MmsiMaritime Mobile Service Identity Mmsi Digital Selective Calling DSCEmergency Messages Distress Procedure Radiotelephone CallsTell where you are Marine Distress ProcedureMarine Distress Procedure DSC SayVHF Marine Channel Assignments International Distress, Safety and Calling 03A Government Only21A U.S. Government Only Canada Coast Guard Only 23A Government Only64A U.S. Government Only Canada Commercial Fishing Digital Selective Calling Voice communications not allowed80A 78A79A 81AWorld City Time Zones Noaa Weather Channels AlertMounting Powering The Radio Included In This PackageFlush Mount Electrical Power ConnectionMicrophone/Speaker Bracket Radio Operator Requirements Installation RequirementsAntenna Requirements And Attachment Safe Maximum Permissible Exposure MPE RadiusExternal Devices Connections Volume Tones And AlarmsPower On-Off Getting StartedStandby And Receive SquelchLCD Backlight Set-Up Routines Settings MenuSet-Up Routines LCD ContrastTo Set Your Radio For The Area In Which You Will Be Using It A./International/Canada Channel MapsVoice Transmission Transmit Power OutputVoice Transmission ChannelsNoaa All Hazards/Weather Radio And Alert Weather Radio And AlertPublic Address Weather Alert Set-UpAdvanced Operation Weather Alert SignalAdvanced Operation Tri-WatchMemory Channels Memory ScanUser Mmsi Number DSC Set-UpDSC Set-Up If You Incorrectly Enter Your Mmsi NumberDSC Scanning If You Transfer Your Radio To a Different VesselGroup Mmsi Number To Set The Position Request Reply Type Position Request Reply TypeIndividual Directory To Enter Or Edit Names And Mmsi Numbers In The DirectorySending Distress Calls DSC OperationDSC Operation Regarding Distress Relay Calls Receiving Distress CallsSending An All Ships Calls Receiving Distress Relay CallsSending a Geographical Call Receiving An All Ships CallSending An Individual Call Receiving a Geographical CallSending a Group Call Receiving An Individual CallReceiving a Group Call Sending a Position RequestIf The Station You Called Cannot Send Its Position To Exit The Position Request ModeIf You Receive a Position If The Station You Called Chose Not To ReplyReceiving a Position Request Sending a Position SendCall Waiting Standby Mode SignalReceiving a Position Send Maintenance Maintenance TroubleshootingSpecifications TroubleshootingExclusions This limited warranty does not apply WarrantyProduct Service For Products Purchased In the U.S.AMake check or money order payable to Order Form Optional AccessoriesOrdering From U.S.A