Maintenance Troubleshooting | Cobra Electronics MR F75 specs

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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Cobra Electronics MR F75 owner manual Maintenance Troubleshooting, Specifications

Contents

MR F75 Customer Assistance For Assistance In The U.S.A For Assistance Outside The U.S.A Table Of Contents Transceiver Controls Indicators And ConnectionsMicrophone/Speaker Product Features Safety Training Information Important Safety InformationImportant Safety Information Always use only Cobra authorized accessories FCC Information VHF Marine Radio Procedures Voice Calling Digital Selective Calling DSC Maritime Mobile Service Identity MmsiMaritime Mobile Service Identity Mmsi Digital Selective Calling DSC Emergency Messages Distress Procedure Radiotelephone Calls Tell where you are Marine Distress ProcedureMarine Distress Procedure DSC Say VHF Marine Channel Assignments International Distress, Safety and Calling 03A Government Only 21A U.S. Government Only Canada Coast Guard Only 23A Government Only 64A U.S. Government Only Canada Commercial Fishing Digital Selective Calling Voice communications not allowed 80A 78A79A 81A World City Time Zones Noaa Weather Channels Alert Mounting Powering The Radio Included In This Package Flush Mount Electrical Power ConnectionMicrophone/Speaker Bracket Radio Operator Requirements Installation RequirementsAntenna Requirements And Attachment Safe Maximum Permissible Exposure MPE Radius External Devices Connections Volume Tones And AlarmsPower On-Off Getting Started Standby And Receive Squelch LCD Backlight Set-Up Routines Settings MenuSet-Up Routines LCD Contrast To Set Your Radio For The Area In Which You Will Be Using It A./International/Canada Channel Maps Voice Transmission Transmit Power OutputVoice Transmission Channels Noaa All Hazards/Weather Radio And Alert Weather Radio And AlertPublic Address Weather Alert Set-Up Advanced Operation Weather Alert SignalAdvanced Operation Tri-Watch Memory Channels Memory Scan User Mmsi Number DSC Set-UpDSC Set-Up If You Incorrectly Enter Your Mmsi Number DSC 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 Directory Sending Distress Calls DSC OperationDSC Operation Regarding Distress Relay Calls Receiving Distress CallsSending An All Ships Calls Receiving Distress Relay Calls Sending a Geographical Call Receiving An All Ships CallSending An Individual Call Receiving a Geographical Call Sending a Group Call Receiving An Individual CallReceiving a Group Call Sending a Position Request If 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 Reply Receiving a Position Request Sending a Position Send Call Waiting Standby Mode SignalReceiving a Position Send Maintenance Maintenance TroubleshootingSpecifications Troubleshooting Exclusions This limited warranty does not apply WarrantyProduct Service For Products Purchased In the U.S.A Make check or money order payable to Order Form Optional AccessoriesOrdering From U.S.A