The radio spectrum is vast and frequencies must be generally recognized for certain modes or activities to reduce interference. Study carefully applicable laws and regulations related to the use of frequencies before receiving, monitoring, scanning or transmitting.

During disasters or other emergencies, NTS radiograms are used to communicate information critical to saving lives or property, or to inquire about the health or welfare of a disaster victim.

Repeaters include two or more radios that simultaneously receive and retransmit radio transmissions. They are often connected to antennas that are positioned on towers or buildings and can be used by licensed operators to extend the range of communications.

The US National Weather Service trains volunteer storm spotters to collect ground truth during severe weather and uses reported information to improve forecasting. The Amateur Radio Service enables us to communicate more effectively with the meteorologists.

Many satellites carry Amateur Radio payloads including some repeaters available for use by licensed operators. Most active satellites send telemetry and some can be decoded with freely available software.

Many software packages are available to enhance our use of the radio spectrum. This page briefly describes a few free applications and provides links for more information.