Antenna Requirements

 

 

 

 

And Attachment

 

 

 

Installation And Start-Up

 

 

 

 

 

 

 

Antenna Requirements And Attachment

 

 

Antenna Requirements

 

 

 

 

Your CobraMarine VHF radio requires an external marine antenna

to send signals into the air and to receive them. The radio is arranged to use any of the popular marine VHF antennas, but it is up to you to choose which antenna to use.

Since it represents the link between your radio and the outside world, Cobra® suggests you purchase the best quality antenna, coaxial cable, and connectors you can. This is best accomplished with the advice and guidance of a knowledgeable dealer who can assess the variables involved with your particular boat and preferences.

WARNING

Compliance with FCC requirements for Radio Frequency Exposure is the responsibility of both the antenna installer and the radio operator.

Safe Maximum Permissible Exposure (MPE) Radius

To avoid health hazards from excessive exposure to RF energy, FCC OET Bulletin 65 establishes an MPE radius of 10' (3 m) for the maximum power of your radio with an antenna having a maximum power gain of 9 dBi. This means that all persons must be at least 10' (3 m) away from the antenna when the radio is transmitting.

Installation Requirements

A)An omnidirectional antenna with a gain not greater than 9 dBi must be mounted at least 16.4' (5 m) above the highest deck where people may be during radio transmissions, measured vertically from the lowest point of the antenna. This provides the minimum separation distance to comply with RF exposure requirements and is based on the MPE radius of 10' (3 m) plus the 6.6' (2 m) height of an adult.

B)For vessels without structure to mount the antenna as described in A, it must be mounted as follows AND all persons must be outside the 10' (3 m) MPE radius during radio transmissions. The antenna must be mounted so that its lowest point is at least 3.3' (1 m) vertically above the heads of all persons during radio transmissions.

Antenna Requirements

And Attachment

Installation And Start-Up

Radio Operator Requirements

Do not transmit when anyone is within the MPE radius of the antenna unless that person or persons are shielded from the antenna by a grounded metallic barrier. This is especially important on vessels with antennas mounted as described in B where no one may be within 9' (2.8 m) horizontally from the base of the antenna during transmissions.

FAILURE TO OBSERVE THE ABOVE LIMITS MAY EXPOSE THOSE WITHIN THE MPE RADIUS TO RF ENERGY ABSORPTION IN EXCESS OF THE FCC MAXIMUM PERMISSIBLE EXPOSURE. IT IS THE RADIO OPERATOR’S RESPONSIBILITY TO INSURE THAT MPE LIMITS ARE HEEDED AND THAT NO ONE IS WITHIN THE MPE RADIUS DURING TRANSMISSIONS.

Coaxial Cable Socket

Antenna Lead Attachment

Once the antenna is installed, the Coaxial Cable Lead can be attached to the socket at the back of the transceiver.

CAUTION

Attempting to transmit without an antenna attached will damage your CobraMarine VHF radio.

 

 

 

 

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Nothing Comes Close to a Cobra® 21

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Cobra Electronics MR F75-D Antenna Requirements Attachment, Antenna Requirements And Attachment, Installation Requirements

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.