TZUTC: -0500   
   MSGID: 509.fidonet-ls_arrl@1:2320/33 28f12530   
   PID: Synchronet 3.20a-Win32 master/777fb6d8b Jun 13 2023 MSC 1929   
   TID: SBBSecho 3.20-Win32 master/777fb6d8b Jun 13 2023 MSC 1929   
   BBSID: TBOLT   
   CHRS: ASCII 1   
   From QRZ.Com, the Icom handout, and Part 97 Of The FCC Rules -   
   Ham Radio Glossary - An overview of amateur radio terms.   
      
   Data communications   
   Transfer of data between two or more locations.   
      
   dBd   
   Unit of RF power as compared to a dipole antenna.   
      
   dBi   
   Unit of RF power as compared to an isotropic antenna.   
      
   dBm   
   Decibels measure, 1 mW with a load impedance of 600 ohms   
   (0 dBm=1 mW).   
      
   DC   
   Direct Current   
      
   DC ground   
   A connection point directly to chassis or battery ground to prevent   
   build-up of hazardous DC voltages.   
      
   DCS   
   Digital Coded Squelch   
      
   DE   
   Telegraphy for "from", such as "DE N5VLZ".   
      
   Deviation   
   The resultant frequency swing of a signal that is frequency modulated (FM).   
   It is a measurement for an FM signal for the maximum carrier frequency   
   changes either side of the carrier frequency.   
      
   Dielectric   
   A non-conductive material used to separate the center conductor and shield   
   (conductor) in coaxial cable; typically made of foam or plastic.   
      
   Dipole   
   Likely the most common wire antenna amongst hams, the easy-to-homebrew   
   dipole consists of two legs (each 1/4 wavelength) which typically extend   
   horizontally and away from each other. One leg connects to the coax's   
   center conductor, and the other leg connects to the coax's shield as a   
   counterpoise. The dipole antenna is usually strung in a horizontal fashion   
   between trees, and works best when at least 1/4 wavelength above the earth.   
      
   Distress call   
   Signals a life-threatening situation, or one involving the safety of life,   
   and/or the protection of property, such as severe weather (tornadoes,   
   hurricanes, flooding, etc.). Most commonly referred to as an SOS or MAYDAY   
   call. Also known as emergency or priority traffic.   
      
   Distress frequency   
   A frequency or channel specific to use in distress calling.   
   Radiotelephne distress frequencies are 2.182 Mhz and 156.8 Mhz.   
   Survival craft use 243 Mhz. Maritime distress frequencies are the   
   same, while aviation frequencies are 121.5 Mhz.   
      
   Downlink   
   Frequency that a repeater or satellite transmits on to a user.   
   Also see Uplink.   
      
   DR   
   A CW abbreviation for "dear", used as a respectful salutation. Example   
   "GOOD EVENING, DR JOHN, HW ARE U?"   
      
   Driven Element   
   An "arm" of a yagi antenna to which RF power is fed from the coax.   
      
   DSP   
   Digital Signal Processor. Used to improve the signal to noise ratio   
   for clearer and more legible communications. Relatively new to the   
   ham radio.   
      
   DSSB   
   Double Suppressed Sideband modulation   
      
   DSW   
   Russian abbreviation for "goodbye" on CW.   
      
   DTCS   
   Digital Tone Coded Squelch. A selective call system.   
      
   DTMF   
   "Dual Tone, Multiple Frequency"; a tone that is actually comprised of two   
   different tones sounded at the same time. It is what you hear when you use   
   the pushbuttons on a standard non-pulse telephone in the U.S. It is also   
   a common way to send analog numeric information, since each numeral between   
   0 and 9 has its own separate tone (and also # and *, and in the case of   
   some radios, A, B, C, and D). These are also used to send remote radio or   
   repeater control commands, such as for net announcements, temporary   
   disabling of the 3 minute timeout timer (such as during ARRL Audio News   
   and/or Amateur Radio Newsline) during traffic nets, etc.   
      
   Dualwatch   
   Receiving two signals simultaneously.   
      
   Dummy Load   
   Typically a power dissipating resistor or device substituted in place of an   
   antenna on a transmitter, used for testing purposes. It's usually a   
   non-radiating 50 ohm load.   
      
   Duplex   
   An operation mode in which the transmit and recive frequencies are   
   different.   
      
   Duplexer   
   A device which divides transmit and receive frequencies.   
      
   Duty cycle   
   The ratios of transmit to receive time.   
      
   DX   
   Long distance; making contacts over long distances. For HF contacts, "DX"   
   is typically considered as such if the station contacted is outside of your   
   country. In some other cases, making a contact over what is considered   
   extremely long distances (for the conditions and band) can be considered   
   "DX" (i.e., a QSO from one end of a state to another, on 2 meters simplex,   
   can be considered "'DX").   
      
   DXCC   
   "DX Century Club"   
   An ARRL-sponsored club by which membership is allowed only after showing   
   proof of having made contact with at least 100 different countries.   
   For more information, please see http://www.arrl.org.   
      
   DXpedition   
   Derived from the words "DX" and "expedition", this term typically refers to   
   a trip made by experienced ham operator(s) to a "DX" country for the   
   purpose of providing other hams an opportunity to make a contact (QSO) into   
   that country.   
   --- SBBSecho 3.20-Win32   
    * Origin: The Thunderbolt BBS - Little Rock, Arkansas (1:2320/33)   
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