OH1

OH1 refers to a specific designation used in various contexts, most notably in the field of amateur radio and emergency communications. In amateur radio, OH1 is the prefix assigned to radio stations in the Czech Republic. The prefix "OH" is derived from the Czech word "Ohm," a unit of electrical resistance named after German physicist Georg Simon Ohm. The numerical suffix "1" identifies the specific station within the country’s allocation.

The Czech Radio Club (Český Radioklub) manages the OH prefix and oversees licensing for amateur radio operators in the country. Stations with the OH1 call sign operate under regulations set by the Czech Republic’s Ministry of Transport, which oversees telecommunications. Amateur radio in the Czech Republic allows enthusiasts to engage in long-distance communication, experimentation with equipment, and participation in emergency response networks.

Beyond amateur radio, OH1 may also appear in other technical or organizational contexts, such as software versioning or internal documentation. However, its most recognized use remains in the realm of radio communications, where it serves as a unique identifier for Czech operators. The prefix system helps distinguish stations globally, ensuring clear and organized communication within the amateur radio community.