Some great info for GMRS radio.
GMRS, which stands for General Mobile Radio Service, is a type of two-way radio communication service primarily used for short-distance communications. It's a popular choice for families and small groups who want to stay in touch while camping, hiking, or participating in outdoor activities.
Here are the basics of GMRS radio:
1. Licensing:
- In the United States, you are required to obtain a GMRS license from the Federal Communications Commission (FCC) to use GMRS radios. The license covers your entire family or group, allowing them to operate GMRS radios under a single license. The cost of the license may vary, and it typically lasts for ten years.
2. Frequency Range:
- GMRS operates in the UHF (Ultra High Frequency) radio spectrum. It uses frequencies between 462 and 467 MHz. These frequencies provide relatively good range and penetration in urban and outdoor environments.
3. Number of Channels:
- GMRS radios offer 22 channels for communication. These channels are divided into two categories: the GMRS/FRS (Family Radio Service) shared channels and the GMRS-only channels.
- GMRS/FRS shared channels: Channels 1-7 are shared with FRS radios, which do not require a license. GMRS radios can operate at higher power levels on these channels when compared to FRS radios.
- GMRS-only channels: Channels 15-22 are exclusively for GMRS use. These channels allow for higher power levels and are often used for more reliable long-distance communication.
4. Power Levels:
- GMRS radios are allowed to transmit at higher power levels than FRS radios, which gives them a longer communication range. The maximum power output for GMRS radios is typically around 5 watts.
5. Privacy Codes:
- Many GMRS radios offer privacy codes, also known as sub-channels or CTCSS (Continuous Tone-Coded Squelch System) tones. These codes allow you to filter out unwanted conversations on the same channel by using a specific tone or code. Keep in mind that privacy codes do not provide absolute privacy; determined users can still hear your conversations.
6. Range:
- The effective range of GMRS radios can vary significantly depending on factors like terrain, obstructions, and the power output of the radios. In ideal conditions, GMRS radios can provide communication ranges of several miles.
7. Accessories:
- GMRS radios often come with various accessories, such as headsets, earpieces, and external microphones, to make communication more convenient and discreet.
8. Emergency Channels:
- Some GMRS radios also include dedicated emergency channels, such as channel 9, which can be used to communicate with emergency services or other GMRS users during urgent situations.
To use GMRS radios within the legal requirements, it's essential to obtain the necessary GMRS license from the FCC and follow the regulations and guidelines specified for GMRS operation. Family members can share the same license, allowing them to communicate with each other on the GMRS channels.