HF Communications Training

HF Communications Training

Introduction:

HF Communications Training Course Hands-on

For decades, HF communications have been an important, in some cases the only, way of providing long distance communication. HF makes to possible to reach people wherever they may be located, whether in the jungles of Congo, bushes of Australia, or the sands of Sahara.

In this HF Communications Training course you will learn both the technology and applications of HF communication, both speech and digital uses such as modem utility, browsing, and mailing, to cite a few examples. For anyone involved with long-distance connectivity, understanding HF technology is a must.

We will start the HF Communications Training course by learning the essential RF propagation concepts. We will then review the challenges offered by HF communications and how we can go about addressing them. We will place particular emphasis on the antenna technology that makes worldwide connectivity possible. We will go on to learn about modulations schemes and communications modes, architecture and design of an HF radio system, and the applications of HF. We will conclude with a comparison of HF with competing technologies and a look at the future of HF. All in all, the course will provide you with a thorough and practical introduction to HF communications.

Customize It:

With onsite Training, courses can be scheduled on a date that is convenient for you, and because they can be scheduled at your location, you don’t incur travel costs and students won’t be away from home. Onsite classes can also be tailored to meet your needs. You might shorten a 5-day class into a 3-day class, or combine portions of several related courses into a single course, or have the instructor vary the emphasis of topics depending on your staff’s and site’s requirements.

HF Communications TrainingRelated Courses:

Duration: 2-3 days

Objectives:

◾List the key components of an HF system and describe how they fit together
◾Explain how radio waves operate in different environments
◾Design an HF communications system
◾Describe the current markets and applications for HF communications

Course Content:

Introduction
◾History of HF communications
◾Terrestrial wireless communications challenges: Attenuation, reflection, diffraction, scattering, multipath effects, interference

Spectrum Basics
◾Electromagnetic spectrum: Bands and uses, regulation
◾More about the HF band
◾Spectrum issues: Line of Sight (LOS) transmission, path loss, etc

Radio Propagation
◾Electromagnetic field
◾Ground and surface waves: What, when
◾Direct waves: Direct LOS, Fresnel theory, free space loss, sum operating margin
◾Sky waves (Ionosphere)
◾Key concepts
◾Structure of the Ionosphere: D, E, F1, F2
◾Critical frequencies: MUF, LUF
◾Propagation effects: Daily, seasonal, geographic, sunspots, interference, weather, solar flares
◾Propagation indices: K, Ap, Solar flux, Sunspot number
◾Tropospheric waves

Antennas
◾Characteristics: Dimensions, gain (dB), polarization, F/B ratio, VSWR, radiation diagrams, HPB
◾Types: Directional, omnidirectional
◾Whip, dipole, inverted Vee, Loop, beams
◾Practical examples

Modulation and Communication Modes
◾Modulation
◾Analog: AM, SSB, FM, PM
◾Digital: xFSK, xASK, xPSK, xQAM
◾Modes
◾CW-Morse
◾AM voice/SSB voice
◾FM voice
◾Digital: Modems/examples

HF Radios
◾Types: Analog, digital, portable, vehicle, nomadic, fixed
◾Types: analog, digital, portable, vehicle-mounted, nomadic, fixed
◾Architecture
◾Characteristics
◾Power
◾Channels
◾Modulation

Uses of HF Communications
◾Long distance/amateur radio
◾Emergency (including disasters) communications
◾Maritime uses
◾Military applications
◾Examples

Link Budget Calculations
◾Basic principles
◾Tools
◾Calculation exercise

Emerging Trends
◾Automatic link establishment
◾Digital new services

Conclusion

◾Comparison of satellite and HF communications
◾Advantages and disadvantages
◾Course recap, Q/A, and Evaluations

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Time Frame: 0-3 Months4-12 Months

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