ADV (Amateur digital video) — A mode
of operation in which Amateur Radio
operators exchange video motion images
using their personal computers.
AM (Amplitude modulation) — The oldest
voice operating mode still found on
the amateur bands. The more common
voice mode, SSB, is actually a narrower-
bandwidth variation of AM.
Amateur Radio — A radiocommunication
service for the purpose of selftraining,
intercommunication and
technical investigations carried out by
amateurs, that is, duly authorized persons
interested in radio technique
solely with a personal aim and without
pecuniary interest. (Pecuniary means
payment of any type, whether money
or goods.) Also called ham radio.
Amateur Radio operator — A person
holding a license to operate a ham radio
station.
Amateur Radio station — A station licensed
in the amateur service, including
necessary equipment.
Amateur Service — A radio communication
service for the purpose of selftraining,
intercommunication and
technical investigations carried out by
amateurs, that is, duly authorized persons
interested in radio technique
solely with a personal aim and without
pecuniary interest.
AMSAT (Radio Amateur Satellite Corporation) — An international membership
organization that designs,
builds and promotes the use of Amateur
Radio satellites.
ARES® — An ARRL program specializing
in emergency communication.
ARISS — An acronym for Amateur Radio
on the International Space Station.
ARRL — The membership organization
for Amateur Radio operators in the US.
ATV (Amateur television) — A mode of
operation that amateur radio operators
use to exchange pictures from their
ham stations.
Auxiliary station — An amateur station,
other than in a message-forwarding
system, transmitting communication
point-to-point within a system of cooperating
amateur stations.
Band — A range of frequencies. Hams are
authorized to transmit on many different
bands.
Bandwidth — The width of a frequency
band outside of which the mean power
of the transmitted signal is attenuated
at least 26 dB below the mean power of
the transmitted signal within the band.
