2-meter band

2-meter band
Name	2-meter band
Frequency	144–148 MHz
Wavelength	2 m
Band	VHF
Country	ITU Region 2

2-meter band. The 2-meter band is a portion of the very high frequency spectrum allocated globally for amateur radio use, centered around a wavelength of two meters. It is one of the most popular and active amateur bands, renowned for its blend of reliable local communication via FM broadcasting and the potential for long-distance contacts through various propagation modes. The band supports a wide array of activities, from casual conversation and emergency communication to amateur satellite operation and direction finding.

Overview

The band's popularity stems from its position within the VHF spectrum, which offers a practical balance between antenna size and reliable propagation characteristics. It is heavily utilized for local and regional communication, often facilitated by a vast network of repeaters maintained by organizations like the American Radio Relay League and local amateur radio clubs. Major events such as Field Day and public service activities for events like the Boston Marathon see extensive use of the band. Its accessibility makes it a primary entry point for new licensees, especially in the United States where the Federal Communications Commission grants privileges on this band to all license classes.

Technical characteristics

The band occupies 144 to 148 MHz in ITU Region 2, which includes the Americas, while other ITU regions have slightly different allocations. Propagation is typically limited to line-of-sight or ground wave, providing consistent local coverage. However, it can experience enhanced conditions such as tropospheric ducting, sporadic E, and auroral propagation, allowing contacts over hundreds or even thousands of kilometers. The band is also used for television modes like Fast Scan television and data modes including Automatic Packet Reporting System. Communication via the International Space Station and satellites like OSCAR is a notable technical activity.

Licensing and operation

Operating privileges on the 2-meter band are granted by national regulatory authorities. In the United States, the Federal Communications Commission administers licensing, with Technicians and higher-class licensees having voice privileges. In the United Kingdom, licensing is managed by Ofcom, while in Canada, Innovation, Science and Economic Development Canada is the regulator. International operation is governed by reciprocal agreements, and operators must identify with their assigned call signs. Exams, often administered by volunteer examiners coordinated through the American Radio Relay League, test knowledge of regulations and technical standards. Rules regarding permissible modes, power limits, and band segments are strictly enforced.

Common uses and activities

The band is a hub for emergency communication; groups like the Amateur Radio Emergency Service and Radio Amateur Satellite Corporation members regularly train on it. Contesting events, such as those sponsored by the American Radio Relay League, are popular. Amateur radio direction finding, known as fox hunting, is a common sport. The band is critical for supporting public service events, disaster response alongside agencies like the Federal Emergency Management Agency, and casual social networking through organized nets. It also serves as the primary frequency for many amateur radio satellite transponders and the International Space Station Amateur Radio on the International Space Station program.

Equipment

Typical equipment includes FM transceivers from manufacturers like Yaesu, Icom, and Kenwood. Many operators use handheld transceivers or mobile units installed in vehicles. Effective operation often requires external antennas, such as Yagi or J-pole designs, and repeater systems to extend range. For weak-signal work, single-sideband modulation equipment is used. Accessories like TNCs for packet radio and amateur television cameras are common. Antenna systems are frequently installed on structures like the Empire State Building or local water towers for height advantage.

Band plans and frequency allocation

Band plans, developed by organizations like the American Radio Relay League and International Amateur Radio Union, recommend voluntary segmentation of the band for different modes. The lower segment, around 144–144.5 MHz in many regions, is dedicated to weak-signal and moonbounce work. The 144.5–145.5 MHz range is often used for amateur satellite operations. The 145–148 MHz segment is predominantly populated by FM broadcasting and repeater inputs/outputs, with specific pairs coordinated by groups like the New England Spectrum Management Council. These plans help prevent interference between different users and activities across the band.

Category:Amateur radio