Question T1B05
From subelement T1 - T1B
How may amateurs use the 219 to 220 MHz segment of 1.25 meter band?
Why is this correct?
The 219-220 MHz segment has a unique, restricted allocation within the 1.25 meter band. Part 97 regulations specifically limit this 1 MHz segment to fixed digital message forwarding systems only. Unlike other portions of amateur bands that allow multiple emission modes, this segment serves a specialized purpose for automated digital communications infrastructure. The other choices (spread spectrum, fast-scan TV, emergency traffic) are permitted elsewhere in amateur allocations but not in this specific segment.
Memory tip
When you see frequency-specific restrictions in amateur radio, they're usually for specialized services or to accommodate sharing with other users. The 219-220 MHz restriction reflects the FCC's approach to efficient spectrum management by dedicating specific segments to particular functions rather than general amateur use.
Learn more
The 219-220 MHz segment represents how Part 97 balances amateur radio privileges with efficient spectrum utilization. Fixed digital message forwarding systems include packet radio networks, APRS digipeaters, and similar infrastructure that routes digital messages automatically. This allocation ensures reliable backbone communications for digital networks while preserving other 1.25 meter frequencies (222-225 MHz) for general amateur operations including voice, CW, and other digital modes.
Think about it
Why do you think the FCC would dedicate an entire 1 MHz segment exclusively to automated digital forwarding rather than allowing mixed-mode operation like most other amateur bands?