National Traffic System

The National Traffic System (NTS) is an organized network of amateur radio operators sponsored by the American Radio Relay League for the purpose of relaying messages throughout the US and Canada.^[1]

During normal times, these messages are routine greetings ("Happy birthday Aunt Mary") and keep the system well oiled and the operators trained so that everything works when needed. When there is an emergency or disaster NTS works closely with the Amateur Radio Emergency Service to provide emergency communications. The most common type of disaster-related messages are "health and welfare" inquiries and notifications into and out of the area affected by the disaster.

In time of disaster, it is easy to expand the system by simply creating additional meeting times for the nets with high volume, or by setting up a specific "trunk line" between two points.

Organizational structure

NTS is defined using geographic areas. The US is divided into areas that approximate time zones. Areas are divided into regions, and regions into sections that correspond to a state. Each of these subdivisions has nets for collecting and distributing traffic. A net is nothing more than a time of day and a radio frequency where the appropriate group of amateur operators can meet to send the messages on their way.

Traffic passing

This process is best explained by an example. Let's say that someone in Minnesota wants to send a birthday greeting to Aunt Mary in California. They telephone their local ham friend and give him the message.

• At 6:30 local time, the Minnesota ham attends ("checks in to") the Minnesota Section net. One station there has been designated to accept all outgoing messages, and Aunt Mary's message is sent to that station.
• At 7:45, the station who received the message checks in to the Region net. This net consists of representatives from all the section nets in the region, and one station has been designated to accept all traffic that flows out of the region. Aunt Mary's greeting will be sent to this station.
• At 8:30, the station from the region checks into the Area net and sends Aunt Mary's greeting to the designated representative from the Pacific area.
• At 8:30 Pacific Time, the Pacific Area net meets. (All the area nets meet at 8:30 local time; since they are in different time zones there is no overlap.) At this point the process is repeated in the opposite order
  • The area representative sends the message to the appropriate region representative,
  • The region representative meets a later session of the region net and sends the message to the appropriate section representative,
  • The section representative meets a later section net and sends the message to the closest operator to Aunt Mary's home
• The final recipient calls Aunt Mary on the telephone and delivers the greeting.

Perhaps this sounds rather complex, but it really isn't. Each net uses the same procedure and operating techniques, so as novice operators gain experience they can "graduate" from section to region to area nets. Every message is placed into the same format. The operation is disciplined but not unduly complex.

See also

• Morse code
• NATO phonetic alphabet
• Packet radio
• Radiogram (message)
• Winlink

External links

• Public service manual from ARRL
• Radio amateurs of Canada description of NTS

References

1. ^ ARRL Public Service Communications Manual [1] 02 March 2010