DOCNUMBER 9500
Document Issue 1, Revision 7
June 2009 Terminology–3
Alpha Radio Products Alpha 9500 HF Linear Amplifier Operating Manual
Product Release 1 Terminology
M
mA — Milliampere. 10-6 A. MHz — Megahertz. 106 Hz.
O
OPR — Operate. PCB — Printed circuit board. Board that
mechanically supports and electrically connects
electronic components.
P
PSK — Phase-shift keying. Digital modulation
scheme in which information is conveyed by
changes, or modulations, in the phase of a
reference signal.
Q
QSK — Quadrature-shift keying. Digital
modulation scheme in which the transmitter is
on only for the duration of each dot or dash and
switches to receive between each dot or dash,
allowing the operator to hear any signal being
sent.
R
RCA — Radio Corporation of America. Also a
type of interconnecting plug.
RF — Radio frequency. Frequency within the
range 3 Hz–300 GHz.
RG-x/x — Coaxial cable type.
RMS — Root mean square. Statistical measure of
the magnitude of a varying quantity such as a
wave.
RTTY — Radioteletype. Telecommunications
system consisting of two or more teleprinters
using radio as the transmission medium.
S
SSB — Single-sideband. Modulation scheme that
refines upon amplitude modulation.
SSTV — Slow-scan television. Picture-
transmission method for transmitting and
receiving static pictures via radio.
STBY — Standby. Mode in which an electronic
appliance is turned off but under power and
ready to activate on command.
SWR — Standing-wave ratio. Ratio of the
amplitude of a partial standing wave at an
antinode (maximum) to the amplitude at an
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