D: Difference between revisions

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<table width="750" border="1" cellpadding="6">
{{glossary}}
  <tr>
 
    <td>[[Dictionary of Ham Radio Terms | A]] </td>
 
    <td>[[B]]</td>
==D==
    <td>[[C]]</td>
 
    <td>[[D]]</td>
'''DAC''' : Also known as D/A and D-to-A. Digital to Analogue converter. A device that converts digital signals into analouge signals.
    <td>[[E]]</td>
 
    <td>[[F]]</td>
'''dB''' : [[Decibels |Decibel]] - the ratio of two power measurements.
    <td>[[G]]</td>
 
    <td>[[H]]</td>
'''dBd''' : dB relative to a dipole. Also known as [[Gain#Gain_compared_to_a_half_wave_dipole_-_dBD |dBD]]
    <td>[[I]]</td>
 
    <td>[[J]]</td>
'''[[Gain#Gain_compared_to_an_isotropic_readiator_.3D_dBi |dBi]]''' : dB relative to a theoretical isotropic (point) source.
    <td>[[K]]</td>
 
    <td>[[L]]</td>
'''[[Radiated Power Measurement | dBm]]''': The power compared to a 1 milliwatt (1mW) source, expressed in decibels (dB)
    <td>[[M]]</td>
 
    <td>[[N]]</td>
'''dBo''' : Optical gain. An unofficial term used by some amateurs working with transmission of data using light.
    <td>[[O]]</td>
 
    <td>[[P]]</td>
'''dBuv''' : a measure of voltage compared to one microvolt. 0dBuv = one microvolt.
    <td>[[Q]]</td>
 
    <td>[[R]]</td>
''' De or DE''' : "this is" or "from" - for example an operator may use VL2TK de VK4ZW .......
    <td>[[S]]</td>
 
    <td>[[T]]</td>
'''[[Dipole]]''' : An antenna with two sides, usually of equal length.
    <td>[[U]]</td>
 
    <td>[[V]]</td>
'''[[Dish or Parabola | Dish]]''' : A highly directional [[Antennas|antenna]], parabolic in shape. Often used at [[Microwave and other bands |microwave]] frequencies.
    <td>[[W]]</td>
 
    <td>[[X]]</td>
'''[http://www.qsl.net/zl1bpu/DOMINO/Index.htm Domino EX]''' : a digital [[Modes | mode]] that uses a variant of MFSK known as IFK for transmission of information.
    <td>[[Y]]</td>
 
    <td>[[Z]]</td>
'''DTMF''' Dual Tone Multi Frequency - the allocation of a unique tone pair to each button on an appliance (made up of two frequencies - high and low) that allows a computer to recognize the tone. Originally used on a wide scale in landline telephony to allow tone dialling using a small keypad on a telephone or handset, but has been used in amateur radio to remotely control repeaters, autopatch, IRLP or Echolink nodes.
    <td>[[0 - 9]] </td>
 
  </tr>
'''[[Dummy load |Dummy Load]]''' : An artificial [[Antennas |antenna]] that does not radiate. A non-inductive power resistor, a dummy load is connected in place of the transmitting antenna and used when aligning transceivers.
</table>
 
'''Duplex''' : Transmit and receive are on two different frequencies - often use in repeaters with a shift (difference) of 600Hz.
 
'''[[DXCC]]''' : DX Century Club
 
'''DX''' : Distance or distant station. Originally "distant exchange", from landline telephony. On HF radio, normally used to refer to a station on another continent or in an exotic location.
 
'''[[DXpedition]]''' : An expedition by amateurs to a location that may be geographically or physically remote and from where amateur contacts are rare.

Revision as of 13:42, 12 June 2009

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 0 - 9


D

DAC : Also known as D/A and D-to-A. Digital to Analogue converter. A device that converts digital signals into analouge signals.

dB : Decibel - the ratio of two power measurements.

dBd : dB relative to a dipole. Also known as dBD

dBi : dB relative to a theoretical isotropic (point) source.

dBm: The power compared to a 1 milliwatt (1mW) source, expressed in decibels (dB)

dBo : Optical gain. An unofficial term used by some amateurs working with transmission of data using light.

dBuv : a measure of voltage compared to one microvolt. 0dBuv = one microvolt.

De or DE : "this is" or "from" - for example an operator may use VL2TK de VK4ZW .......

Dipole : An antenna with two sides, usually of equal length.

Dish : A highly directional antenna, parabolic in shape. Often used at microwave frequencies.

Domino EX : a digital mode that uses a variant of MFSK known as IFK for transmission of information.

DTMF Dual Tone Multi Frequency - the allocation of a unique tone pair to each button on an appliance (made up of two frequencies - high and low) that allows a computer to recognize the tone. Originally used on a wide scale in landline telephony to allow tone dialling using a small keypad on a telephone or handset, but has been used in amateur radio to remotely control repeaters, autopatch, IRLP or Echolink nodes.

Dummy Load : An artificial antenna that does not radiate. A non-inductive power resistor, a dummy load is connected in place of the transmitting antenna and used when aligning transceivers.

Duplex : Transmit and receive are on two different frequencies - often use in repeaters with a shift (difference) of 600Hz.

DXCC : DX Century Club

DX : Distance or distant station. Originally "distant exchange", from landline telephony. On HF radio, normally used to refer to a station on another continent or in an exotic location.

DXpedition : An expedition by amateurs to a location that may be geographically or physically remote and from where amateur contacts are rare.

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