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Glossary of Terms

 Icom Ham Radio Terms

Alternating Current - electrical current that periodically changes direction.  This is usually in the form of a sine wave.
Amateur Operator - someone using amateur radio equipment to communicate with other amateur radio operators.  This requires an amateur license.
Amateur Service -
Amateur Station - a radio station used to provide radio communications by an amateur radio operator.
Ammeter - electrical measuring circuit or meter to indicate the amount of current flowing in a circuit.
Ampere (A) - Unit of measure of current flowing in a circuit. 
Amplitude Modulation (AM) - Modulation of radio waves by means of varying the amplitude of an alternating current carrier. The highest frequency of the information is about 10% of the carrier frequency.
Antenna - an electric device that is used to convert electrical energy to radio waves and vise versa.  It can be a simple as a short piece of wire or really elaborate shapes and sizes.
Antenna Switch - a device used to turning on/off RF energy going to/from 1 or more antennae.
Antenna Tuner - a device for matching the impedence between an antenna with the transmission line in order to transmit/receive the maximum amount of energy.

Balun - a term that is a mix of balanced and unbalanced to refer to a transformer used to convert a unbalanced signal to a balanced one.  The unbalanced side usually has one side tied to ground, whereas the balanced side is equally balanced with no reference to ground.
Band Spread - a secondary control used for precise tuning.  One way is have a large tuning device such as a variable capacitor for tuning large sections and then a parallel smaller variable capacitor for fine tuning (i.e. band spread).
Band-Pass Filter - a circuit that allows frequencies to pass while rejecting those above and below the frequencies it's designed for.
Bandwith - measurement of a range of frequencies, usually in reference to a circuits response to those frequencies.
Battery - a device with electrochemicals for storing or producing energy to provide power to circuits.
Beacon Station - an amateur station that regularly sends out signals.  In most cases used for propagation tests or other experiments.
Beam Antenna - a directional antenna that sends/receives signal within a narrow area of coverage. 
Beat-Frequency Oscillator (BFO) - an oscillator that is used to mix or beat with the intermediate frequency to produce audio tone.   Also used to demodulate SSB signals.
Block Diagram - A diagram that uses boxes or blocks to represent more complex devices with connections between blocks representing flow between components.
Broadcasting - transmission of information meant for a disperse audience.  Typically radio and television.

Call Sign - a mixture of letters and numbers assigned to amateur radio operators to uniquely identify them.
Capacitance - ability of an electric circuit or component to store an electric charge.
Centi - unit prefix denoting hundreths.  For example centimeter.
Chassis Ground - a link between different electical components to it's metal casing or cabinet.  Usually to provide a single point or common ground point to the chassis.
Chirp - a shift in frequency up or down when keying a transmitter.
Closed Repeater - ham radio operators use repeaters to reach further.  However to prevent abuse or limit use only certain people are allowed access.  As opposed to open repeaters.
Closed Circuit - a complete connection that allows current to flow. 
Coaxial Cable (Coax) - a coax cable has a center conductor surround by an insulating layer, which has a tubular conductor around the insulating layer. The outer tubing conductor acts as a shield to the enery in the center conductor.
Color Code -
Conductor -
Connected -
Continuous Wave -
Control Operator -
Control Point -
Controlled Environment -
Core -
Courtesy Tone -
CQ -
Crystal Oscillator -
Crystal Controlled Transmitter -
Cubical Quad Antenna -
CW (Morse Code) -

D Region -
Data -
DE -
Delta Loop Antenna -
Detector -
Digipeater -
Digital Communications -
Dipole Antenna -
Direct Current (DC) -
Directional Wattmeter -
Director -
Double-Pole, Double-Throw (DPDT) Switch -
Double-Pole, Single-Throw (SPST) Switch -
Driven Element -
Dual-Band Antenna -
Dummy Antenna -
Dummy Load -
Duplexer -
Duty Cycle -

E-Region -
Earth Ground -
Earth Station -
Earth-Moon-Earth (EME) or Moonbounce -
Electric Field -
Electromotive Force (EMF) -
Electron -
Emergency -
Emergency Traffic -
Emission -
Emission Privilege -
Emission Types -

F-Region -
Fals or Deceptive Signal -
Feed Line -
Filter -
Final -
Frequency -
Frequency Bands -
Frequency Coordination -
Frequency Coordinator -
Frequency Counter -
Frequency Discriminator -
Frequency Modulation (FM) -
Frequency Privilege -
Front-End Overload -
Fuse -

General Coverage Receiver -
Giga -
Grace Period -
Ground Connection -
Ground Rod -
Ground-Wave Propagation -

Half-Wave Dipole -
Ham -
Ham-Bands-Only Receiver -
Harmonics -
Health and Welfare Traffic -
Hertz (Hz) -
High-Pass Filter -

Impedance -
Impedance-Matching Device -
Inductance -
Inductor -
Input Frequency -
Insulator -
Itermediate Frequency (IF) -
Ionizing Radiation -
Ionosphere -

Jumper -

K -

Lightning Protection  -
Limiter -
Line-Of-Sight Propagation -
Lower Sideband (LSB) -
Low-Pass Filter -

Malicious (harmful) Inteference -
Maximum Useable Frequency (MUF) -
Mayday -
Mega -
Metric Prefixes -
Metric System -
Micro -
Microphone -
Milli -
Mobile Device -
Modem -
Modulate -
Moduation -
Monitor Mode -
Morse Code (CW) -
Multimeter -
Multi-Mode Transceiver -

National Electrical Code -
Network -
Nonionizing Radiation -
NPN Transistor -

Offset -
Ohm -
Ohm's Law -
One-Way Communications -
Open Circuit -
Open Repeater -
Operator/Primary Station License -
Output Frequency -

Packet Radio -
Parallel Circuit -
Parasitic Beam Antenna -
Parasitic Element -
Peak Envelope Power (PEP) -
Pecuniary -
Phone -
Phone Emission -
Phonetic Alphabet -
Pico -
PL -
PNP Transistor -
Polarization -
Portable Device -
Potentiometer -
Power -
Power Supply -
Priority Traffic -
Procedural Signal (Prosign) -
Product Detector -

Q-Signal -
QSL Card -
Quarter-Wavelength Antenna -

Radio Amateur Civil Emergency Service (RACES) -
Radio-Frequency Interference (RFI) -
Radioteletype -
Receiver -
Receiver Incremental Tuning (RIT) -
Receiver Overload -
Reflection -
Reflector -
Repeater Station -
Resistance  -
Resitor -
Resonant Frequency -
Reverse Beacon Network (RBN) - a network of stations listening on the bands and reporting when, where, and how strong they receive a signal.  A great way to see if your signal is heard, where, and how strong.
RF Burn -
RF Carrier -
RF Overload -
RF Radiation  -
RF Safety -
Rig -

Safety Interlock -
Schematic Symbol -
Selectivity -
Sensitivity -
Series Circuit -
Shack -
Short Circuit -
Sideband -
Silent Key (SK) -
Simplex Operation -
Single Sideband -(SSB) Phone -
Single-Pole, Double-Throw (SPDT) Switch  -
Single-Pole, Single-Throw (SPST) Switch -
Skip Zone -
Sky-Wave Propagation -
Space Station -
Specific Absorption Rate (SAR) -
Splatter -
Spurious Emission -
Standing-Wave Radio (SWR) -
Station Grounding -
Sunspot Cycle -
Sunspots -
Switch -
SWR Meter -

Tactical Call Signs -
Television Interference (TVI) -
Temperature Inversion -
Temporary State of Communications Emergency -
Terminal -
Third-Party Communications -
Third-Party Communications Agreement -
Third-Party Participations -
Ticket -
Time-Out Timer -
Transceiver -
Transistor -
Transmission Line -
Transmitter -
Troposphere -
Tropospheric Bending -
Tropospheric Ducting -

Unbalanced Line -
Uncontrolled Environment -
Unidentified Communications Signal -
Upper Sideband (USB) -

Variable Capacitor -
Variable Resistor -
Variable-Frequency Oscillator (VFO) -
Vertical Antenna -
Visible Horizon -
Voice -
Voice Communication -
Volt (V) -
Voltage -
Voltmeter -

Watt ( W) -
Wattmeter -
Wavelength -

X -

Yagi Antenna -

Z -

Last modified on Tuesday, 06 September 2016 14:11

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