Abbreviation for automatic message accounting.

A radiocommunication service for the purpose of self-training, intercommunication and technical investigation carried out by amateurs, that is, by duly authorized persons interested in radio technique solely with a personal aim and without pecuniary interest. [NTIA] [RR]

A station in the amateur service. [NTIA] [RR]

A radiocommunication service using space stations on Earth satellites for the same purposes as those of the amateur service. [NTIA] [RR]

The level of acoustic noise existing at a given location, such as in a room, in a compartment, or at a place out of doors.
Note 1: Ambient noise level is measured with a sound level meter.
Note 2: Ambient noise level is usually measured in dB above a reference pressure level of
0. 00002 Pa, i.e., 20 Pa (micropascals)… (Read More →)

The temperature of air or other media in a designated area, particularly the area surrounding equipment.

Abbreviation for amplitude modulation equivalent, automatic message exchange. See compatible sideband transmission.

The U. S. standards organization that establishes procedures for the development and coordination of voluntary American National Standards.

See ASCII.

Abbreviation for alternate mark inversion. See alternate mark inversion signal.