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Technical Topics => Part 15 AM and FM Station Operation => Topic started by: tybee on May 10, 2022, 2126 UTC

Title: When licenced operation is secondary to Part 15
Post by: tybee on May 10, 2022, 2126 UTC

An interesting bit of trivia.. Licenced operation in the 900mHz frequency is secondary to unlicensed operation in that band. This is because part 15 in 900mHz came into existence before licenced operation ever did.

900mHz is the only exception in which Part 15 operation actually trump's a licensed operation.

Title: Re: When licenced operation is secondary to Part 15
Post by: tybee on May 11, 2022, 1727 UTC

I should mention that information was gleemed from a 36 page research paper (2006) entitled "Spectrum Policy Wonderland: A Critique of Conventional Property Rights and Commons Theory in a World of Low Power Wireless Devices"
by J.H. Snider, Ph.D.
I just thought it interesting.

It's easily downloadable via a Google search.
Here's a direct quote:

"...As a general rule, unlicensed devices authorized by the FCC are expected to be secondary to licensed devices... The one little known exception where unlicensed devices are not secondary to licensed devices is in the 900 MHz band, widely used for cordless phones, baby monitors, and other simple indoor unlicensed devices.
The 900 MHz exception occurred because of a historical anomaly. Unlicensed devices were authorized first in this band and licensed services only later.
Following its normal practice of protecting incumbents against newcomers, the FCC granted the unlicensed incumbents safe harbor protections against the licensed newcomers..."