LWHC HAM RADIO TODAY School Club Round Up

Transcription

1 LWHC HAM RADIO TODAY School Club Round Up

2 What is HAM RADIO Who, What, How, Where, When and Why J. Currie, W7ARK Digital Communications Science Education Experimentation Instrumentation Measurements Safety Emergency Communications Wide Number of Frequencies Space Communications Digital Communication: accurate replication, noise immunity, can be encrypted, Transmission at a higher rate, more secure, clearer human audio, minimal electromagnetic interference and narrow Band width. html

3 Overview Of Radio Welcome to Amateur Radio Radio, Equipment and Signal Fundamentals Electricity, Components, and Circuits Propagation, Antennas, and Feed Lines Communicating with Other Hams Ambassador to other countries Contests Your Path forward The Radio Story is just beginning to be understood as we collect information from satellites. ARRL NASA

4 History of Wireless Guglielmo Marconi Physicist Nobel Prize for Physics 1909 Heinrich Hertz demonstrated electromagnetic radiation. From Wire To Wireless Read Book Thunderstruck by Erik Larson Today Digital- Dstar, CW, Ritty, Psk31, Winlink, and ETC Study the Classical Experiments Electrical, waves and etc

5 How Do Radios Work? 1. Negative ve charged Electrons repel each other 2. Conductors have spare, loosely held Electrons 3. Flowing Electrons in conductors create a Magnetic Field 4. AC Current at high frequencies are Electromagnetic waves 5. These Waves travel at the speed of light. 6. Specific Frequencies can travel great distances. 7. Radio Electronic can send and Receive these waves. Examples For Today are Digital Communication 1. Charge Van der Graah Generator 2. Magnetism Compass Needle, Sliding Magnet field 3. Electromagnetic Spectrum and Waves -- Spring 4. Digital Transmission Simplex ---Reflector--QSO 5. Antennas Length in meters = 300/Frequency MHZ 6. Satellites

6 Four States of Matter

7 Electromagnetic Spectrum

8 Sun Earth Connection The Sun's plasma is so hot that the most energetic charged particles can escape from the Sun's gravity and fly away, out into space. We call this plasma the solar wind because it blows out away from the Sun and past the planets, interacting with their magnetic fields and/or atmospheres.

9 Earth s Magnetic Field Earth's magnetic field comes from this ocean of iron, which is an electrically conducting fluid in constant motion. Sitting atop the hot inner core, the liquid outer core seethes and roils like water in a pan on a hot stove. These complex motions generate our planet's magnetism through a process called the dynamo effect

10 Sun Earth Connection

11 Handheld Antenna Rubber Duck VFO Volume Push to talk Speaker Microphone Key Board

12 String Radio 1. Modulation Voice frequencies and volume Compress air and causes vibration From bottom cup to transfer to string. Demodulate voice Modulate voice to string 2. Demodulation string vibrates Cup this compresses air and is Transferred to ear.

13 Electromagnetic Wave &view=detail&id=1d24f0d7ce489b bdc &first=1

14 Electric / Magnetic Field Current flowing through wire

15 Magnetic Field Current in Coil

16 US Amateur Radio Band Chart

17 AM Short Wave------VHF TV---FM UHF TV---Mobile Phones MF HF VHF UHF 2m or 144 MHz 0.7M or 440 MHz 0.3 MHz 3MH 30MHz 300MHz 3000 MHz.710 KIRO 97.3 KIRO KOMO KNTT KKWF VFO Frequency Mode Power Duplex Tone Memory

18 The Basic Radio Station Transmit-Receive Switch

19 What Happens During Radio Communication? Transmitting (sending a signal): Information (voice, data, video, commands, etc.) is converted to electronic form. The information in electronic form is attached or embedded on a radio wave (a carrier). The radio wave is sent out from the station antenna into space.

20 What Happens During Radio Communication? Receiving end: The radio wave (carrier) with the information is intercepted by the receiving station antenna. The receiver extracts the information from the carrier wave. The information is then presented to the user in a format that can be understood (sound, picture, words on a computer screen, response to a command).

21 Radio Waves are AC Radio waves (electromagnetic radiation) are ac waves. Radio waves are used to carry the information you want to convey to someone else.

22 String Radio 300 L f 300 x 10^6m/s L = meters F = Freq MHz

23 SIMPLEX Station A to B Frequency A MHz Power Low Tone 0 Frequency B MHz Power Low Station A Mode DV Power 0.1 watt Station B

24 One Wavelength The distance a radio wave travels during one cycle. One complete change between magnetic and electric fields.

25 Wave Vocabulary Before we study radio waves, we need to learn some wave vocabulary. Amplitude Frequency Period Wavelength Harmonics F 2F 3F A MHz

26 Frequency Spectrum view of Radio Signal

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28 Copper is a conductor

29 Good Conductors Gold Silver Copper Aluminum Salt Water Wet Ground Good Insulators Plastic Rubber Wood Paper Pure Water Glass

30 The Dipole Most basic antenna. Two conductive, equal length parts. Feed line connected in the middle. Total length is ½ wavelength (½ l ). Length (in feet) = 468 / Frequency (in MHz) Length(in meters)= 300 / Frequency (in MHz) Length (in meters) *39 = Length in inches

31 The Dipole

32 The Ground-Plane

33 Propagation

34 CW Contest m, 15 m, 20 m, 40 meter Antenna 2. CW, power 100 watts 3. Note propagation

35 Directional Antenna Yagi

36 Join the Fun Contests DX Challenges Working all States, Countries, QRP Experiment -- Ducting, planet Jupiter and its transmissions, Plasma Emergency ARES, Personal Safety Social - like cell hone. LWHC can help you get into space Cube Satellites Get a license, Join a Club and enjoy a life time of Fun. John Currie, W7ARK 2014, Educator, Cal Poly Dave Wickert, AE7TD, Microsoft Horace Hamby, N7DRW, BCHE - GT

37 Careers Electricity, Electronics and Radio Careers STEM Subjects Add Skills Needed for Careers Science, Technology, Engineering and Applied Maths

38 How Do HAMS USE Their STEM Skills? Scouts Ask MB Badge Counselors: What is your Career? What are your skills and how did you get them? Are STEM skills applied in Science Projects? What are STEM Skills and Subjects? Science Biology, Chemistry, Physics and applied Science Technology Electricity, Electronics, Computers, Space Science, Robotics, Molecular Biology and Radio Engineering Apply STEM Skills to Build Things Electrical, Mechanical, Civil, BioTech, Bio Chemistry, Chemical, Architect and Aeronautical Applied Math: Programming, Graphical Displays, Data Analysis, Trends, Algorithms, linear Algebra, Statistics, Data Bases, Calculus, Geometry, Waves, Trigonometry.

39 Careers Depends on Skills on Board Careers are Supported by Continuous Learning and Upgrading of STEM Skills High School Degree Trade School College University PhD Specialty High School Diploma Must Have Business owner Specialty Equipment Operators Medical technicians Repair Service Installers tv, Phone & etc.. Electricians Computer Maintenance, Installation, Repair Mechanics- Mechanical, Electrical Sales Military University Degree and Higher Manufacturing Electronics Equipment Engineering Electrical, Mechanical, Etc. Computers Pilot Military Scientist Researcher Professor Doctor Nurse Telecommunications