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Technician License Course Chapter 2 Radio and Electronics Fundamentals

Technician License Course Chapter 2 Radio and Electronics Fundamentals. Equipment Definitions Hour-1. Basic Station Organization. Station Equipment Receiver Transmitter Antenna Power Supply Accessory Station Equipment Repeaters. What happens during radio communication?.

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Technician License Course Chapter 2 Radio and Electronics Fundamentals

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  1. Technician License CourseChapter 2 Radio and Electronics Fundamentals Equipment Definitions Hour-1

  2. Basic Station Organization • Station Equipment • Receiver • Transmitter • Antenna • Power Supply • Accessory Station Equipment • Repeaters

  3. 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 imbedded on a radio wave (a carrier) • The radio wave is sent out from the station antenna into space

  4. 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)

  5. What happens during radio communication? • This sounds pretty simple, but it in reality is pretty complex • This complexity is one thing that makes ham radio fun…learning all about how radios work • Don’t be intimidated, you will be required to only know the basics, but you can learn as much about the “art and science” of radio as you want

  6. The basic radio station

  7. The Receiver and Controls • Main tuning dial for received frequency (or channel) selection • Frequency display • Volume control • Other accessory controls for mode (kind of information to process), filters (to mitigate interference), etc.

  8. The Transmitterand Controls • Main tuning dial for transmitted frequency (or channel) selection • Frequency display • Power control (transmitted signal strength) • Other accessory controls for mode (kind of information to process), etc.

  9. The Transceiver • You will notice that many of the controls of the transmitter and receiver are the same • Many modern transmitters and receivers are combined in one unit – called a transceiver • Saves space • Cost less • Many common electronic circuits are shared in the transceiver

  10. Transceiver Controls • Some are physical knobs that you manually adjust • Some are controlled by computer and you control the settings with keypad entries that program a computer in the transceiver

  11. Antenna • The antenna exposes your station to the world • Facilitates the radiation of your signal into space (electromagnetic radiation) • Intercepts someone else’s signal • Many times the transmitting and receiving antenna are the same antenna • Connected to your station by a connecting wire called a feed line

  12. Transmit/Receive (TR) Switch • If the station antenna is shared between the transmitter and receiver, the TR switch allows the antenna to be switched to the transmitter when sending and to the receiver when receiving • In a transceiver, this TR switch is inside the unit and requires no attention by the operator

  13. Power Supply • Your radio station needs some sort of power to operate • Battery • Household current converted to proper voltage • Alternative sources

  14. Power Supply • Most modern radios operate on 12 volts direct current (DC) • A power supply converts household current to the type of current and the correct voltage to operate your station • Could be internal, might be external • You are probably familiar with common “wall-wart” power supplies

  15. Human interface accessories Microphones Speakers Earphones Computer Morse code key TV camera Etc. Station performance accessories Antenna tuner SWR meter (antenna match checker) Amplifier Antenna rotor (turning antenna) Filters Etc. Basic Station Accessories

  16. Accessory Equipment

  17. Special stations you will use (Repeaters) • Repeaters are automated stations located at high places that receive and then retransmit your signal - simultaneously • Dramatically improves range • The basic components of a repeater are the same as your station: receiver, transmitter, antenna, and power supply

  18. Repeaters • But, repeaters are transmitting and receiving at the same time using the same antenna • This requires a very high quality and specialized filter to prevent the transmitted signal from over-powering the receiver • This specialized filter is called a duplexer

  19. Repeater

  20. Review Test Questions • T4C01 – 06 • T5A01, 02, 04 • T5C01

  21. Next Time • Basic Electricity • Read 2-4 through 2-14

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