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

 

 

 

 

 

 

Specifications

 

Operating Your Radio

 

 

 

 

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

 

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

 

 

 

 

 

 

 

 

 

60 English

Nothing Comes Close to a Cobra® 61

Page 33
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Cobra Electronics MR F75-D owner manual Maintenance Troubleshooting, Specifications

MR F75-D specifications

Cobra Electronics has long been a name associated with reliable communication solutions, and the MR F75-D is no exception. This high-performance marine VHF radio is designed specifically for boaters, offering a blend of essential features, advanced technologies, and user-friendly characteristics that make it an excellent choice for both recreational and commercial marine applications.

One of the standout features of the MR F75-D is its Class D DSC (Digital Selective Calling) capability, which allows users to send distress calls and communicate with other vessels or coast guard stations at the push of a button. This increases safety on the water, as it provides an automated means to alert others in case of emergencies.

The radio operates seamlessly on the vital marine channels, ensuring that users have access to all the necessary frequencies for navigation and communication. With an impressive 25 watts of transmitting power, the MR F75-D provides extended range, ensuring that calls can be made even in challenging conditions.

The Cobra MR F75-D boasts an ergonomic design featuring a solid weather-resistant construction to withstand the harsh marine environment. Its large, easy-to-read backlit LCD display enhances readability in bright sunlight or low-light conditions, making it accessible under various circumstances.

Moreover, the radio includes a built-in NOAA weather radio with alerts. This feature keeps users informed about local weather conditions and forecasts, enabling them to make better decisions while out at sea. The option to scan channels and save favorites makes it easy to navigate through crowded frequencies to find the right communication line.

The MR F75-D is equipped with Dual Watch and Tri-Watch functions, allowing users to monitor two or three channels simultaneously. This increases the chances of receiving essential messages while on the water, providing greater peace of mind.

With a compact design, the MR F75-D can fit easily on most boats, while the intuitive controls enhance usability. The radio also supports external GPS connection, offering even better situational awareness.

In conclusion, the Cobra Electronics MR F75-D is a versatile, durable, and feature-rich marine VHF radio. With its DSC capabilities, NOAA weather notifications, and robust build, it proves to be an invaluable tool for safe and efficient marine communication, making it a top choice for any boating enthusiast.