On today's episode, I will go through my slides on my presentation for Ham Radio University, which I normally do every year.

This is my practice run for the presentation that I gave at HRU on January 8, 2022.

If HRU publishes the presentation, we will follow up with a link.

This presentation is for those who are new to the scanner radio hobby, or need a quick reset and want to have a bit of a refresher on some scanner radio topics and terms.

If you need more help with your scanner, you can book me for a 1 hour tutoring session at www.scannerschool.com/tutoring

What You Need To Know

• We use scanners instead of two way radios for scanning because:
  • Scanners typically have a much faster scan rate
  • Have better memory management
  • Scanners have a larger frequency range than most two way radios
  • Scanners can typically support multiple modes and technologies
• There are three main types of transmitting and receiving:
  • Simplex: Single Frequency - point to point
    • Mostly used on Fireground and tactical channels
  • Duplex: Two Frequencies – point to poing
    • Radio 1 Tx's on one freq where Radio 2 Rx's
    • Radio 1 Rx's where Radio 2 Tx's
  • Repeaters: Two Frequencies
    • All radios Tx on the repeater input frequency
    • All radio Rx on the repeater output frequency
    • Gives a large footprint on radio communication
    • Mostly used on dispatch frequencies
  • Analog is the most common transmission type that we could use
    • Used by Aviation, Ham, Rails, Marine, etc
  • Digital has better spectrum usage
  • Typical Digital Modes in scanning are:
    • P25
    • DMR
    • NXDN
    • (TETRA is used Outside the US. No Scanner can Rx TETRA)
  • Trunking Improves Spectrum Efficiency
  • Common Trunk Systems are:
    • Motorola Type II
    • EDACS
    • LTR
    • P25
    • DMR
    • NXDN
  • Many users can be on a trunk system and voice channels are distributed "on demand"
  • If a group is not talking, they do not tie up a voice path
  • All users listen for commands on a control channel and only move to a voice channel when told to by the control channel

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All session notes with links to the items we talked about can be found on our website at

https://www.scannerschool.com/session212