Episode 2019-02 - Radio Signals and Waves

Hello and welcome to the next edition of the Mike Wills Podcast! This is the Dog Days of Podcasting edition for August 2, 2019. I am KE0VYC and my name is Mike Wills. This season, we are covering amateur (or ham) radio.

  • Radio waves are non-ionizing radiation meaning you won't become the hulk by using radios. Radios transmit electromagnetic light waves.
  • They talk about the difference between Frequency (time to do one phase) and Phase (a measure of time within the signal).
  • Radio Spectrum - You'll notice a pattern here for ranges.
    • VLF (Very low frequency) 3 kHz - 30 kHz.
    • LF (Low Frequency) 30 kHz - 300 kHz.
    • MF (Medium Frequency) 300 kHz - 3 MHz - AM Radio falls into this range
    • HF (High Frequency) 3 MHz - 30 MHz
    • VHF (Very High Frequency) 30 MHz - 300 MHz - VHF TV and FM Radio falls into this range
    • UHF (Ultra High Frequency) 300 MHz - 3 GHz - UHF TV and Mobile Phones falls into this range. Anything over 1 GHz is considered microwaves
    • SHF (Super High Frequency) 3 GHz - 30 GHz
    • EHF (Extremely High Frequency) 30 GHz - 300 GHz
  • Then they start talking about how to calculate wavelength. This brings us to the first formula.
    • The speed of light is very close to 300 million meters per second
    • Radio waves travel at a constant speed of light
    • Thus you can calculate radio wavelengths into meters by the formula 300/frequency in MHz.
    • With this formula, I was able to pass both the Technician and the General license tests.
  • What is a Transceiver?
    • There are three basic elements of any amateur station. A transmitter, receiver, and an antenna.
    • Normally, you join the transmitter and receiver into one unit called a transceiver which is then connected to an antenna.
    • A repeater works much the same way except that it receives on one frequency and transmits on another at the same time.
    • The purpose of a repeater is to give the hight needed to make longer-range communications.

Thank you for listening. 73 from KE0VYC

  • podcast/ddop/public/episode_201902.txt
  • Last modified: 2019/08/01 05:21
  • by mikewills