1 Chelmsford Amateur Radio Society Foundation Licence Course Murray Niman G6JYB Slide Set 6: v1.2, 18-Sep-2009 (6) Propagation Chelmsford Amateur Radio.

Slides:

Advertisements

Similar presentations

Wireless LAN RF Principles

Advertisements

Propagation of Waves Ham Radio Class Week 5 Wave propagation.

Intermediate Course (6) Propagation Karl Davies Intermediate Course (6) Propagation Karl Davies East Kent Radio Society EKRS 1.

Foundation Course Propagation.

What is Amateur (Ham ) Radio ??. It’s a hobby, a technical hobby with a large number of different activities within it. It contains a certain element.

Chapter 3 – Radio Phenomena

Technician Licensing Class “T3” Valid dates: July 1, 2010 – June 30, 2014.

Amateur Radio Frequency Propagation

Introduction Syllabus covers a wide range of propagation topics:-

HOW DOES MY SIGNAL GET FROM HERE TO THERE? By Forest Cummings, W5LQU And Dave Russell, W2DMR.

Objects in space orbit other objects because of the gravitational force between them When the comet is far away from the Sun the gravitational force is.

P1g(ii) Wireless Signals You will learn about: How radio signals are transmitted around the Earth How radio waves are diffracted

Chapter Fifteen: Radio-Wave Propagation

Radio Frequencies. Oscillator Feedback loop Oscillator As the output of the amplifier is fed to the input, feedback or oscillation occurs.

Chapter 10 Topics in Radio Propagation Rick, WØPC.

AMATEUR RADIO TRAINING Propagation v1.101 © essexham.co.uk.

1 Chelmsford Amateur Radio Society Advanced Licence Course Murray Niman G6JYB Slide Set 13: v1.1, 10-Nov-2005 (5) Feeders Chelmsford Amateur Radio Society.

1 of 12 Chelmsford Amateur Radio Society Intermediate Licence Course Christopher Chapman G0IPU Slide Set 8 (6) Propagation Chelmsford Amateur Radio Society.

ECE 4321 Computer Networks Chapter 4 Transmission Media: Wireless.

Propagation of radio waves. Ways of travelling Propagation in ionosphere Propagation in troposphere Special ways of reflecting Propagation depends on.

Naval Weapons Systems Energy Fundamentals Learning Objectives  Comprehend basic communication theory, electromagnetic (EM) wave theory  Comprehend.

Propagation Measurements and Models for Wireless Communications Channels Brian Alexander.

Technician License Course Chapter 2 Radio and Electronics Fundamentals

Sharif University of Technology Physical layer: Wireless Transmission.

Scientific Notation 1,000,000,000 = 1 X 109 GIGA (G)

How Radio Waves Act Similar to Book Chapter 2 – sections 2.4 and 2.6.

Sharif University of Technology Physical layer: Wireless Transmission.

Technician License Course Chapter 4

Wireless Communications By Kyle Heys Engr 302 Prof Ribeiro.

Chapter 7 Propagation The Ionosphere

Certified Wireless Network Administrator (CWNA) PW0-105 Chapter 2 Radio Frequency Fundamentals.

Radiation and Propagation of Waves

Chapter 2 Radio Frequency Fundamentals.

Amateur Radio Nature Amateur Radio is for self-training and experimentation, and is non-commercial in nature Benefits Amateur Radio is of value in areas.

P5e radio communication By the end of this lesson you should be able to: Describe how the amount of diffraction depends upon the size of the gap and the.

General Frequency Ranges Microwave frequency range –1 GHz to 40 GHz –Directional beams possible –Suitable for point-to-point transmission –Used for satellite.

What is Amateur (Ham) Radio ? FOUNDATION COURSE. What is amateur radio? It’s a hobby, a technical hobby with a large number of different activities within.

Weather & Climate Chapter 1 Section 3. OBJECTIVE: Investigate and describe characteristics of the atmospheric layers.

Technician License Course Chapter 4

DIGITAL VS ANALOGUE. LEARNING TARGET I CAN... DESCRIBE THE DIFFERENCE BETWEEN ANALOGUE AND DIGITAL SIGNALS TO EXPLAIN THE ADVANTAGES AND DISADVANTAGES.

1 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYB Slide Set 9 (9) Safety Chelmsford Amateur Radio Society M3 Foundation.

Practice Questions 2015 General License Course. How is a directional antenna pointed when making a “long-path” contact with another station? A. Toward.

Signal Propagation Basics

Radio Wave Propagation

By Saneeju m salu. Radio waves are one form of electromagnetic radiation RADIO WAVES.

EEE 441 Wireless And Mobile Communications

Performance of long-distance VHF-band communication links based on scattering from perturbed Ionosphere. מציגים : יואב צידון שי ביטון מנחה : פרופ ' נתן.

fundamentals of wireless communication

Antennas and Propagation

Antennas and Propagation

Visit for more Learning Resources

Signal Propagation Basics

AMATEUR RADIO TRAINING

AMATEUR RADIO TRAINING

Technician Licensing Class

Lecture 4: Wave Propagation Concept

Mobile Radio Environment – Propagation Phenomena

CSE 4215/5431: Mobile Communications Winter 2011

Mode of Propagation 1/ An amateur is in contact with a station in New York on the 15 metre band, the normal expected mode of propagation will be; Ground.

Chelmsford Amateur Radio Society Intermediate Course (6) Propagation

Mobile Radio Propagation

Technician Licensing Class

Eng. Ibrahim N. Abu-Isbeih

Why are direct (not via a repeater) UHF signals rarely heard from stations outside your local coverage area? A. They are too weak to go very far B. FCC.

Chelmsford Amateur Radio Society Intermediate Course (6) Propagation

Propagation Effects on Communication Links

HF Signal Propagation Bill Leonard N0CU 1 June 2019

Technician License Course.

Presentation transcript:

1 Chelmsford Amateur Radio Society Foundation Licence Course Murray Niman G6JYB Slide Set 6: v1.2, 18-Sep-2009 (6) Propagation Chelmsford Amateur Radio Society Foundation Course (6) Propagation

2 Chelmsford Amateur Radio Society Foundation Licence Course Murray Niman G6JYB Slide Set 6: v1.2, 18-Sep-2009 (6) Propagation Mechanisms & Effects Waves Nominally Travel in Straight Lines Diffraction - Waves can spread out/around hills and obstacles. Such as after passing through narrow gaps and around corners Reflection - Waves (esp at UHF+) can bounce off buildings Refraction - VHF+ can be bent by high/low pressure - often termed lifts or ducting. HF is bent by the Ionosphere Other mechanisms include Meteor Scatter, Aurora, multipath, fading and Rain/Aircraft Scatter for microwaves.

3 Chelmsford Amateur Radio Society Foundation Licence Course Murray Niman G6JYB Slide Set 6: v1.2, 18-Sep-2009 (6) Propagation VHF/UHF VHF/UHF has almost line of sight propagation A clear path is much more effective to get a good signal than a 10 or 100 times increase in power. –For example Satellites can be accessed with low power at great distances if there are no obstructions Refraction/Diffraction over the Horizon does occur but is limited. Buildings/Hills will cause shadows and path loss In towns UHF+ reflects/scatters off buildings better. Higher antennas are better than high power, and outdoor antennas perform much better than indoor ones

4 Chelmsford Amateur Radio Society Foundation Licence Course Murray Niman G6JYB Slide Set 6: v1.2, 18-Sep-2009 (6) Propagation HF and the Ionosphere Ionosphere is layers of Ionised air km above earth Layers vary day to night - and with sunspot cycles etc HF is bent by ionosphere (refraction) - VHF+ passes through Earth 400km 70km