Subj : Todays New Gear Tip
To   : All
From : Daryl Stout
Date : Sat Oct 07 2017 12:04 am

VHF/UHF Glossary 

Airband: VHF channels for aviation air-to-air and air-to-ground
communications

All-mode: radio that can operate on AM, SSB, CW, digital modes and FM 

APRS: Automatic Position Reporting System

ARES(R): Amateur Radio Emergency Service, sponsored by the ARRL's
Field Organization

Attenuate (attenuation): reduce in strength

Auto-patch: connection ("patch") between a radio and the telephone system

Automotive adapter: device that plugs into a vehicle lighter socket and
supplies power to a radio or electronic device

Battery pack: several battery cells connected together to act as a single,
larger battery

Beam: antenna with gain primarily in one direction

Charger: device for recharging batteries

Cloning: duplicating the memory contents of a radio in another radio

Cross-band: receiving on one band and transmitting on another

CW (Continuous-wave): Morse Code

dB (decibels): logarithmic method of comparing two signal strengths
(power, voltage, current)

Digital mode: communication method that exchanges characters instead of
voice or CW

DTMF: Dual-Tone, Multi-Frequency, signaling tones ("TouchTones (R)")
used by telephone systems 

Duplex: transmitting on one frequency and receiving on another in the
same band

Emcomm: abbreviation for "emergency communications"

Energy density: amount of energy a battery stores per amount of weight
or volume

Feed line: cable used to transfer radio-frequency energy 

FRS: Family Radio Service, short-range handheld radios that can be used
without a license

GMRS: General Mobile Radio Service, a no-test licensed service in the
UHF range for family use 

Gain (antenna): antenna's ability to concentrate received or transmitted
energy in a preferred direction 

Ground-plane: conductive surface that acts as an electrical mirror.
A ground plane antenna is an antenna that requires a ground plane to
operate

HF: High Frequency (3 to 30 MHz)

Impedance: opposition to ac current flow by a circuit, feed line, or
antenna

IRLP: Internet Repeater Linking Project, a system of accessing and
linking repeaters through the Internet

MARS: Military Affiliate Radio System in which hams communicate with
military stations

Menu: list of selectable control or configuration functions or options

Monitor: listen without transmitting or disable a radio's squelch to
listen for weak signals

Mount (mag, trunk, lip, mirror): a method of attaching an antenna to
a vehicle

Overload: signal so strong that circuits begin to operate improperly 

Packet: amateur digital data system that communicates using VHF and UHF
frequencies

Polarization: orientation of radio waves with respect to the surface of
the Earth (vertical, horizontal polarization)

Power supply: device that changes ac power into dc power

Range: distance over which communication can take place 

Rotate (batteries): to take in and out of service, preventing continuous
use

Scanning: monitor a range of frequencies or a set of memory channels for
activity

Simplex: transmitting and receiving on the same frequency

Shortwave: see HF

Sub-audible: audio frequencies below the usual communication range of
300 to 3000 Hz

Trunking (trunked) systems: VHF/UHF systems used by commercial and
government agencies, sharing a few channels among many users by using
computers to control the radio's frequencies 

UHF: Ultra High Frequency (300 MHz to 3 GHz)

VFO: Variable Frequency Oscillator, refers to a radio's continuous
tuning mechanism

VHF: Very High Frequency (30 MHz to 300 MHz) 

Wall wart: light-duty power supply plugged directly into the an ac outlet

Whip: antenna made from a long, thin metal rod

Winlink (Winlink 2000): system for sending and receiving email via
Amateur Radio


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