Beam

Side lobe

Main

Side

Antenna

Figure A.0.1 - Antenna pattern

A.1 CHARACTERISTICS OF RADAR WAVE

Radio waves travel out from the antenna while bending slightly along the earth’s surface. The amount they bend depends on atmospheric conditions. The sight distance of a radar generally is about 6% longer than the optical sight distance and is calculated using this

equation: Radar sight distance (NM) = 2.22 ( antenna height (m) + target height (m))

 

 

Line of sight

 

 

Radar Radio Wave

h1

Earth

h2

 

 

Figure A.1 - Radar wave

A.1.0 Targets difficult to display on screen

The intensity of the reflected radio signal from a target depends on the distance, height, and size of the target, as well as its material and shape, along with the radar’s transmitter power output and antenna size. Targets made of fibreglass, wood, or other low-reflectance materials or those that have a small incident angle are difficult to display on a screen. Sandy beaches, and sandy or muddy shallows can be difficult to catch. Because there’s not much to reflect a signal back to you, a coastline can actually be closer to your boat than it appears on the screen.

Invisible

 

3

 

 

 

Apparent coastline

1

 

 

 

 

HU

 

Visible

 

 

Actual (invisible)

 

 

coastline

 

Figure A.1.0 - Targets difficult to display on screen

A.1.1 Shadow zones of radar

Radar waves propagate in a straight line. A high outcropping of land or a large ship will

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Radar Installation Manual

 

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Standard Horizon MDS-8, MDS-9 Characteristics of Radar Wave, Targets difficult to display on screen, Shadow zones of radar

MDS-9, MDS-8, MDS-10-5, MDS-10-4, MDS-1 specifications

Standard Horizon's MDS series of marine radios is widely recognized for its reliable performance and advanced features, catering to the needs of boaters and mariners around the world. Let's delve into the main features, technologies, and characteristics of the MDS-1, MDS-10-4, MDS-10-5, MDS-8, and MDS-9 models.

The MDS-1 is a compact yet robust digital selective calling (DSC) radio, designed for ease of use in emergencies. It incorporates a built-in GPS receiver, allowing users to easily transmit their location in distress situations. The MDS-1 features a waterproof design with a high IP rating, ensuring it performs well even in challenging marine environments. The user-friendly interface and large buttons make it accessible for all boaters, while its lightweight construction allows for easy installation on various vessels.

The MDS-10-4 offers advanced digital capabilities, featuring a four-channel simultaneous receiver. This enables users to monitor multiple channels at once, improving situational awareness. With its robust build and exceptional audio quality, the MDS-10-4 also boasts Bluetooth connectivity, allowing seamless communication with compatible devices. This radio is equipped with a clear, backlit LCD screen for easy operation in low-light conditions, making it an ideal choice for nighttime navigation.

The MDS-10-5 goes one step further, offering enhanced functionalities and an impressive five-channel simultaneous reception feature. It comes with customizable channel settings and supports various communication modes, including VHF, AIS, and DSC. The integrated GPS and built-in loudspeakers provide clear audio output, ensuring critical information is received promptly. The MDS-10-5 is an essential tool for professional mariners who require reliable communication and navigation capabilities.

The MDS-8 model stands out for its user-friendly design, making it suitable for recreational boaters. It features a simple interface with intuitive controls, allowing users to access the most important functions with ease. The MDS-8 is equipped with advanced noise-canceling technology that enhances audio clarity, even in noisy marine environments. Its compact size makes it an excellent addition for space-conscious boaters.

Finally, the MDS-9 combines portability with performance, offering a lightweight design and rechargeable battery option. It features a rugged construction that ensures durability while providing essential functions like weather alerts, making it a vital tool for staying safe on the water. The MDS-9 is particularly favored by those who enjoy day trips or coastal cruising, as its reliable communication capabilities enhance safety and reassurance.

Overall, the Standard Horizon MDS series showcases a commitment to quality and innovation, providing users with essential tools for safe and effective maritime communication.