d---- ( Deci (prefix for 10*-1) )

D---- ( Diode )

D'Arsonval meter---- ( A common mechanical meter consisting of a permanent magnet and a moving coil (with pointer attached). )

da---- ( Deca (prefix for 10) )

D/A---- ( Digital-to-analog )

DAC---- ( Digital-to-analog converter )

Dark Channels---- ( Frequencies above and below the 40 CB channels used by CB pirates. )

Darlington Transistor---- ( A package of two transistors in one case, with the collectors tied together, and the emitter of one transistor connected to the base of the other. The effective current gain of the pair is approximately the product of the individual gains of the two devices. )

DARPA---- ( Defense Advanced Research Projects Agency; formerly ARPA, sponsors of ARPANET. )

Data---- ( Computer-based communications modes, such as packet radio, which can be used to transmit and receive computer files, or digital information. Telemetry, telecommand and computer communications emissions having designators with A, C, D, F, G, H, J or R as the first symbol; 1 as the second symbol; D as the third symbol; and and emission J2D. Only a digital code of a type specifically authorized in this Part may be transmitted. )

Datagram---- ( A mode of packet networking in which each packet contains complete addressibg and control information. (compare virtual circuit). )

Data set---- ( Modem. )

dB---- ( Decibel (0.1 bel) )

dBd---- ( Unit of RF Power as compared to a Dipole Antenna. )

dBi---- ( Unit of RF Power as compared to an Isotropic Antenna, decibels above (or below) Isotropic Antenna. )

dBm---- ( Decibels measure, 1mW with a load impedance of 600greek{W (0 dBm=1mW), decibels above (or below) one milliwatt. )

DBM---- ( Doubly balanced mixer. )

dBV---- ( Decibels above/below 1 V (in video, relative to 1 VP-P) )

dBW---- ( Decibels above/below 1 W. )

dc---- ( Direct current; the polarity is fixed for all time, as contrasted to ac (alternating current) where polarity constantly reverses. )

D-C---- ( Direct conversion. )

DC-DC Converter---- ( A circuit for changing the voltage of a dc source to ac, transforming it to another level, and then rectifying the output to produce direct current. )

DCE---- ( Data circuit-terminating equipment, the equipment (for example, a modem) that provides communications between the DTE and the line radio equipment. )

DC Ground---- ( A connection point directly to to chassis or battery ground to prevent
buildup of hazardous DC Voltages. )

DDS---- ( Direct digital synthesis. )

DE---- ( The Morse code abbreviation for "from" or "this is." )

Dead Key---- ( Activating the microphone, but not talking. Same as "keying the mike" (Pour CB ettiquette) . )

DEC---- ( District Emergency Coordinator. )

Deci---- ( The metric prefix for 10*-1, or divide by 10. )

Decibel---- ( Unit of sound measurement; a logarithmic unit of relative power measurement that expresses the ratio of two power levels. )

Decibel---- ( The smallest change in sound level that can be detected by the human ear, Power Gains
and Losses are also expressed in decibels. )

deg---- ( Degree. )

Delta Loop Antenna---- ( A variation of the cubical quad. A Full wavelength loop antenna built with it's elements in the shape of equilateral triangles. )

Delta Tune---- ( Control on CB rig for fine tuning off frequency channels. )

Descending node---- ( The point on the ground track of the satellite orbit where the sub-satellite point (SSP) crosses the equator from the Northern Hemisphere into the Southern Hemisphere. )

Desense---- ( A problem characteristic of many radio receivers in which a strong RF signal overloads the receiver, reducing sensitivity. )

Despair Box---- ( Box where square CB components are kept. )

DET---- ( Detector. )

Destination---- ( In packet radio, the station that is the intened receiver of the frame sent over a radio link either directly or via a repeater. )

Deviation---- ( A measurement for FM signals for the maximum carrier frequency changes either side of the carrier frequency. )

Deviation Ratio---- ( The ratio between the maximum change in RF-carrier frequency
and the highest modulating frequency used in an FM transmitter. )

DF---- ( Direction finding; direction finder. )

DG---- ( Direct Ground. )

Digipeater---- ( Digital repeater. A device that receives, temporarily stores, and then retransmits packet radio transmission directed specifically to it; a link-level gateway station capable of repeating frames. The term "bridge" is used in industry. A packet-radio station used to retransmit signals that are specifically addressed to be retransmitted by that station. )

Digital---- ( A system that allows signals to assume a finite range of states. Binary logic is the most common example. Only two values are permitted in a binary system; one value is defined as a logical 1 and the other value as a logical 0 . )

Digital Communications---- ( Computer-based communications modes. This can include data modes like packet radio and text-only modes like radio teletype (RTTY); A packet radio (digital) repeater. )

Digital Signal Processing (DSP)---- ( A recently developed technology that allows software to replace electronic circuitry. )

Diode---- ( A two-element vacuum tube or semi-conductor with only a cathode and anode (or plate). )

DIP---- ( Dual in-line package. )

Dip Meter---- ( A device used to determine the resonant frequency of an electronic circuit. )

Dipole---- ( Antenna consisting of a length of wire or tubing, open and fed at the center. The entire
antenna is ½ wavelength long at the desired operating frequency. )

Dipole Antenna---- ( A popular type of wire antenna often used on the high-frequency amateur bands; A dipole need not be 1/2 wavelength long. )

Direct Current (dc)---- ( A flow of charged particles (electrical current) through a conductor in one direction only. )

Director---- ( A parasitic element in Front of the Driven element in a multi element (YAGi) antenna. )

Directional Antenna---- ( An antenna that concentrates more of the transmitted energy in a particular directions, aka: Beams. )

Directional Wattmeter---- ( A test instrument used to measure both forward and reflected power ouput (in watts) of a transmitter . )

Distress Call---- ( ie: SOS or MAYDAY--Signals a Life Threatening Situation.) . )

Divider---- ( A network of components that produce an output signal that is a fraction of the input signal. The ratio of the output to the input is the division factor. An analog divider divides voltage (a string of series connected resistors) or current (parallel connected resisters). Digital dividers divide pulse trains or frequency. )

DMM---- ( Digital multimeter; A test instrument that usually measures at least; voltage, current and resistance, and displays the result on a numeric digit display, rather than AN ANALOG METER. )

Domain---- ( In packet radio, the combination of a frequency and a geographical service area. )

Doppler effect---- ( An apparent shift in frequency caused by satellite movement toward or away from your location. )

D.O.T.---- ( Department of Transportation; used to indicate a truck weighing or inspection station. )

Double key---- ( Two stations talking at the same time. )

Double L---- ( Telephone call. Also referred to as "Land line". )

Double-pole,double-throw (DPDT) Switch---- ( A switch that has six contacts. The DPDT switch has two center contacts. The two center contacts can each be connected to one of two other contacts. )

Double-pole, single-throw (DPST) Switch---- ( A switch that connects two contacts to another set of contacts. A DPST switch turns two circuits on or off at the same time. )

Downlink ~ Uplink---- ( A frequency that a Repeater or Satellite transmits on to a user; The frequency on which radio signals originate from a satellite for reception by stations on Earth. )

DPDT---- ( Double-pole double-throw (switch). )

DPSK---- ( Differential phase-shift keying. )

DPST---- ( Double-pole single-throw (switch). )

Drain---- ( The connection at one end of a field-effect-transistor channel, often the output. )

D-Region---- ( The LOWEST Region of the Ionosphere. The D region contributes very little to short-wave radio propagation. It acts mainly to absorb energy from radio waves as they pass through it. This absorption has a significant effect on signals below about 7.5 MHz during daylight. )

Driven Element---- ( The element connected directly to the FEED line in a multi element antenna. )

DS---- ( Direct sequence (spread spectrum); display. )

DSB---- ( Double sideband. )

DSP---- ( Digital Signal Processor--Used to improve noise to ratio for cleaner and more legible communications; A recently developed technology that allows software to replace electronic circuitry. )

DTCS---- ( Digital Tone Coded Squelch--ie: A Selective call system. )

DTE---- ( Data terminal equipment, for example a VDU or teleprinter. )

DTMF---- ( Dual Tone Multi Frequency ie: Touch Tone, Used for Transmit / Receive, numeric information such as Repeater Frequencies, phone number, PIN; The series of tones generated from a keypad on a ham radio transceiver (or a regular telephone). )

Dual-band Antenna---- ( An antenna designed for use on two different Amateur Radio bands. )

Dual Conversion---- ( Receiver circuit to cut out interference from stations using adjacent channels. )

Dummy Antenna or dummy load---- ( A resistor or set of resistors used in place of an antenna to test a transmitter without radiating any electromagnetic energy into the air. )

DUMMY LOAD---- ( (A Non-Radiating 50greek{W load connected to the Transmitter to replace the antenna for testing purposes. )

Duplex or full duplex---- ( A mode of communication in which a user transmits on one frequency and receives on another frequency simultaneously (see half duplex). )

Duplexer---- ( A device which divides Transmit and Receive signals; a device that allows the repeater transmitter and receiver to use the same antenna simultaneously; A device that allows a dual-band radio to use a single dual-band antenna. )

Duty Cycle---- ( The ratio between the actual RMS value of an RF signal and the RMS value of a continuous signal having the same PEP value expressed as a percentage. A duty cycle of 100% corresponds to a continious carrier, such as a Test signal; A measure of the amount of time a transmitter is operating at full output power during a single transmission. A lower duty cycle means less RF Radiation exposure for the same PEP output. )

DVM---- ( Digital voltmeter. )

dx---- ( A ham radio abbreviation for distance or foreign countries. )

DX---- ( Distance or long-distance, foreign countries. A long distance transmission usually caused by Skip. Often the cause of unnecessary QRM; duplex. )

DXAC---- ( DX Advisory Committee. )

DXCC---- ( DX Century Club; a popular ARRL award earned for contacting Amateur Radio operators in 100 different countries. )

DXE---- ( In AX .25, Data switching equipment, a peer (either master nor slave) station in balanced mode at the link layer. )

DXing---- ( Operation to contact far-distant stations (foreign countries on HF, beyond the radio horizon on VHF and higher bands). )

DX Packet Cluster---- ( A method of informing hams, via their computers, about the activities of stations operating from unusual locations. )

DXpedition---- ( A trip to an unusual location, such as an uninhabited island, where hams operate fot a designated period of time. DXpeditions provide sought-after contacts for hams who are anxious to contact that rare location. )

Page's --- Just click on

A	B	C	D	E
F	G	H	I	J
K	L	M	N	O
P	Q	R	S	T
U	V	W	X-Y-Z

Lycos Small Business

The Copyright Minefield By Jacqui Kramer, Contributing Author
10/5/2000 9:19:53 AM PDT

"The copyright issue is a sticky one for Web site owners and their employees, particularly contractors.
Currently in the United States, there are no laws that specifically address copyright issues in the online world.
However, the U.S. courts have ruled that existing copyright laws governing the print world can be applied to the online world."

If by mistake, I've used someone's copyright material, notify me, and I'll remove it.

All Trademarks are Recognised as belonging to Their Respective Owners