Acronym List for Amateur Radio

AC = alternating current

AF = audio frequency

AM = amplitude modulation

ARRL = American Radio Relay League, the national association for amateur radio

CQ = calling any station

CW = Morse code telegraphy (continuous wave)

DC = direct current

DE = "from" or "this is"

DMM = digital multimeter

DSB = double sideband with suppressed carrier

DX = distant radio stations in foreign countries

EME = Earth-Moon-Earth or moonbounce

EP = Emergency Preparedness

FB = fine business

FCC = Federal Communications Commission

FM = frequency modulation

FSK = frequency shift keying

GOTA = get on the air

HF = high frequency (3 MHz -to- 30 MHz)

Hz = Hertz, unit for frequency, cycles/sec.

JOTA = Jamboree on the Air

LSB = the part of the signal below the carrier frequency

MUF = maximum useable frequency, the highest-frequency radio signal that will
  reach a particular destination using sky-wave propagation, or skip

NVIS = near-vertical incident sky-wave

PEP = peak envelope power, the average power of a signal at its largest
  amplitude peak

Q factor = impedance/resistance

QRM = radio interference, man-made

QRN = radio interference, natural phenomena

QRO = higher power

QRP = low power

QSO = conversation between two radio amateurs

QSY = change to transmission on another frequency

QTH = location

RACES = Radio Amateur Civil Emergency Service, a part of the Amateur Service that
  provides radio communications for civil preparedness organizations during local,
  regional or national civil emergencies

RF = radio frequency

RFI = radio-frequency interference, disturbance to electronic equipment caused
  by radio-frequency signals

RST = a system of numbers used for signal reports: R is readability, S is strength
  and T is tone. (On single-sideband phone, only R and S reports are used,
  e.g. "5 by 9")

RTTY = radioteletype

SDR = software defined radio

SSB = single sideband

SWR = standing wave ratio, a measure of the impedance match between the feed line
  and the antenna

TNC = terminal node controller

TVI = television interference, interruption of television reception caused
  by another signal

VFO = variable-frequency oscillator, an oscillator used in receivers and
  transmitters. The frequency is set by a tuned circuit using capacitors and
  inductors. The frequency can be changed by adjusting the components in the
  tuned circuit

VHF = very high frequency (30 MHz -to- 300 MHz)

VOX = voice operated break-in

UHF = ultra-high frequency (300 MHz -to- 3 GHz)

USB = that part of the signal above the carrier frequency

WPM = words per minute

WSPR = Weak Signal Propagation Reporter Network

73 = best regards