Automatic Gain Control (A.G.C.)

Alternating Current (A.C.)

Amplitude Modulation (A.M.)

Amateur Radio

AMP or Ampere 

Attenuator

Capacitance

Carrie Wave

Continuous Wave (C.W.)

Direct Current  (D.C.)

Decibel

Detector

Dipole - Antenna

Long Distance  (D.X.)

Frequency Modulation  (F.M.)

High Frequency  - (H.F.)

Amplifier  - I.F.

Low Frequency  - L.F.

Lower Sideband - L.S.B.

Single Side Band - S.S.B.