Two-way radios can both transmit and receive radio signals. They are used to communicate with other people within a limited range, such as in camps or during road travel. In most models the transmission function is deactivated by default, with a push-to-talk button present to open the transmission channel.
Two-way radios operate on different frequencies, usually identified by numbered channels. Citizens band (CB) radios operate on the first 40 channels with a frequency range of 26.965 to 27.405 MHz, while business band radios take up the 154.570 to 467.925 MHz range.
Amateur and hobbyist radios are designed for general-purpose communication. They are used for recreational and personal transmissions, and usually occupy a wide range of lower frequency bands. Popular hobbyist radios include CB radios and Family Service Radio systems.
Aviation
Aviation radio systems are used for communication between two aircraft, either with both parties in the air or with one on the ground. There are two frequency bands used: the air band, which covers the 108 to 137 MHz range, and the Universal Integrated Communication (UNICOM) service, occupying the 122.700 to 123.075 range.
Land-based commercial and government
Commercial and government radios are used for state and business applications, such as public radio stations and the business band service. Examples of this type of radio include walkie-talkies and base stations.
Marine
Marine two-way radios are used for communication along the coast and between water vessels They are most commonly used in large ships and tankers. Marine radio systems include marine VHF radios and the international calling and distress frequency (2182 Khz).
Reception: Choose a two-way radio that can operate within a wide range. Make sure the reception is smooth and continuous even when used on moving vehicles. Look for one that can operate on the higher or lower limits of the frequency band, which are less crowded and will ensure a better connection.
Power source: Choose a two-way radio that runs on readily available power sources, such as alkaline or rechargeable batteries. Make sure they can last for long periods on fully charged batteries to reduce battery costs. If you use you radio regularly, consider getting one with lithium batteries that can be charged on a dock.
