FM (Frequency modulation) — An operating
mode commonly used on ham
radio repeaters.
Fox hunt — A competitive Amateur
Radio activity in which hams track
down a transmitted signal.
Frequency coordinator — An entity, recognized
in a local or regional area by
amateur operators whose stations are
eligible to be auxiliary or repeater stations,
that recommends transmit/
receive channels and associated operating
and technical parameters for such
stations in order to avoid or minimize
potential interference.
FSTV (Fast-scan television) — A mode
of operation that Amateur Radio operators
can use to exchange live TV images
from their stations.
Ham band — A range of frequencies on
which ham communication are authorized.
Ham radio — Another name for Amateur
Radio.
Ham radio operator — An Amateur
Radio operator holding a written authorization
to operate a ham station.
Harmful interference — Interference
which endangers the functioning of a
radionavigation service or of other
safety services or seriously degrades,
obstructs or repeatedly interrupts a
radiocommunication service — including
ham radio — operating in accordance
with the international Radio
Regulations.
HF (High frequency) — The radio frequencies
from 3 to 30 MHz.
HSMM (High Speed Multimedia) — A
digital radio communication technique
using spread spectrum modes primarily
on UHF to simultaneously send and
receive video, voice, text, and data.
IARU (International Amateur Radio
Union) — The international organization
made up of national Amateur
Radio organizations such as the ARRL.
Image — Facsimile and television emissions
having designators with A, C, D,
F, G, H, J or R as the first symbol; 1, 2
or 3 as the second symbol; C or F as the
third symbol; and emissions having B
as the first symbol; 7, 8 or 9 as the second
symbol; W as the third symbol.
Information bulletin — A message directed
only to amateur operators consisting
solely of subject matter of direct
interest to the amateur service.
International Morse code — A dot-dash
code as defined in International Telegraph
and Telephone Consultative
Committee (CCITT) Recommendation
F.1 (1984), Division B, I. Morse Code.
