What changed
Amateurs and the spectrum — edited Sep 5, 2026 by Unknown editor
This is the first recorded version, so every line is shown as added. Note: Imported from content/wiki
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Every amateur band exists because somebody argued successfully for it, and several bands amateurs
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once had are gone. The pattern repeats: a commercial service wants frequencies, amateurs are a
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secondary or shared user, and the question asked is always the same — are amateurs demonstrably
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using this spectrum for something the public benefits from?
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## 1912: pushed onto the frequencies that turned out to matter
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The **Radio Act of 1912** confined private stations to wavelengths of **200 meters and shorter**,
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which the commercial and naval services of the day regarded as useless. Amateurs discovered
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ionospheric propagation there and crossed the Atlantic within a decade. The lesson stuck in the
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service's memory: the spectrum nobody wants today is not necessarily worthless tomorrow. See
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[a history of US licensing](/wiki/radio-history/licensing-history).
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## 1924: the first real bands
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Before the treaty conferences, US amateurs were given defined allocations at **80, 40, 20 and
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5 meters** in **1924** — the first time the service had bands rather than a wavelength ceiling, and
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the moment 20 meters began its career as the workhorse DX band. Ten meters opened to amateurs in
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**1927**.
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## 1927: recognition by treaty
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The **International Radiotelegraph Conference in Washington (1927)** replaced "200 meters and down"
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with internationally recognized amateur allocations, and established the national call-sign prefix
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system — needed because amateurs were by then routinely working other countries and there was no way
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to tell where a station was. Amateur radio stopped being a leftover and became a service with
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allocations set by treaty.
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## 1979: the WARC bands
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The **World Administrative Radio Conference of 1979** granted amateurs three new HF allocations at
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**30, 17 and 12 meters**, phased in through the 1980s. They are narrow, exclusive in most countries,
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and quiet by tradition — no contests. They were won on the strength of a documented record of
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amateur activity and technical contribution, which is exactly the argument the service still makes.
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See [the WARC bands](/wiki/operating/warc-bands).
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## 1988: losing 220–222 MHz
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The FCC reallocated **220–222 MHz** from the amateur service to land mobile use, a proceeding driven
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in part by a proposed commercial narrowband system. Amateurs kept 222–225 MHz. The band is the
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service's standing example of what happens to an allocation that looks lightly used: the loss was
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argued and lost largely on occupancy.
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## 2000s: 60 meters, and channels instead of a band
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US amateurs received access to **five discrete channels near 5 MHz** in 2003 — not a band, but
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individual channels shared with federal users, with a power limit and an upper-sideband convention.
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**WRC-15** later created a small worldwide 60 meter allocation at 5351.5–5366.5 kHz; the United
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States kept its channelized approach. It is a good illustration of modern spectrum politics:
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amateurs increasingly gain access by sharing carefully rather than by exclusive allocation.
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## The microwave bands under pressure
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- **3.3–3.5 GHz (9 cm)** — the FCC moved to remove the amateur secondary allocation from
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3.3–3.45 GHz as that spectrum was cleared for commercial 5G, with a transition for existing
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amateur use. Weak-signal and amateur-television work on 9 cm was the casualty.
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- **1240–1300 MHz (23 cm)** — Europe's Galileo satellite navigation service shares this range, and
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studies through **WRC-23** examined amateur coexistence. The outcome was technical conditions and
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coordination guidance rather than removal, but the band is no longer somewhere amateurs can assume
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they will be left alone.
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- **902–928 MHz (33 cm)** — proposals to reconfigure the lower 900 MHz band for a commercial
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terrestrial positioning service drew heavy amateur opposition in FCC filings, on the argument that
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amateur mesh networking, [APRS](/wiki/operating/digital-modes/aprs) links and experimental work
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are real, documented uses of a shared band.
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The through-line: **microwave allocations are where the pressure is now**, because that is where
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commercial demand is. See [band plans](/wiki/operating/band-plans) and
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[VHF/UHF and microwave operating](/wiki/operating/vhf-uhf-operating).
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## Rules can expand what a band is worth
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Not every fight is about frequencies. In **2023** the FCC removed the **symbol-rate limit** on HF
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data emissions, replacing it with a bandwidth limit — a rule written for 1980s teleprinters had been
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capping modern error-corrected data modes for decades. The band edges did not move; what amateurs
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could legally do inside them did. See [Part 97 basics](/wiki/rules/part-97-basics) and
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[digital modes](/wiki/operating/digital-modes).
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## Why occupancy is the argument
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Amateur allocations are justified by use, and "use" has to be visible to a regulator reading
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comments in a docket. This is the unglamorous reason ordinary activity matters: contest logs,
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[POTA and SOTA](/wiki/operating/parks-and-summits) activations, satellite passes, mesh links and
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[FT8](/wiki/operating/digital-modes/ft8) traffic are the evidence base. An empty band is an
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argument against itself.
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## Sources and further reading
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- [Amateur radio frequency allocations](https://en.wikipedia.org/wiki/Amateur_radio_frequency_allocations)
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— Wikipedia overview of the international allocation table.
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- [IARU spectrum and regulatory pages](https://www.iaru.org/) — the amateur service's own
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representation at the ITU, including WRC outcomes.
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- [FCC Amateur Radio Service](https://www.fcc.gov/amateur-radio-service) — dockets, orders and the
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current US rules.
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- [FCC Part 97](https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-97) — the
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allocations as they stand in law today.
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- [AC6V's amateur radio history](https://ac6v.com/history.php) — Rod Dinkins, AC6V (SK), for the
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early allocation dates.
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Continue with [from spark to software](/wiki/radio-history/technology-timeline), or back to
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[amateur radio history](/wiki/radio-history).