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Reminder: 2 weeks to go for DominoEX Prefix Contest

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  • Andrew O'Brien
    Please Spread The Word! Purpose : This contest is intended to test the viability of DominoEX as a digital contest mode, since it compares favourably to RTTY
    Message 1 of 1 , Jul 1 6:24 PM
      Please Spread The Word!

      Purpose : This contest is intended to test the viability of DominoEX
      as a digital contest mode, since it compares favourably to RTTY
      and may better under certain conditions. Digital mode experimenters and
      RTTY contesters are encouraged to particpate and provide feedback.
      A prefix related contest has been chosen so that people within the same country
      can work eachother as well as encourage DX contacts. (see scoring , below).

      Contest Name: " DominoEX Prefix Contest".

      Suggested Contest Call: "CQ DominoEx Contest" or "CQ DPC"

      Date: July 15, 2006

      Time: 0000 UTC to 1800 UTC

      Bands: 160,80,40,20,15, 10.

      Mode : DominoEX only

      DominoEx is developed by Wassilieff ZL2AFP and Murray Greenman ZL1BPU
      DominoEx has a variety of baud rates that can be used. Entrants are
      encouraged to read
      the techical details of each baud rate via

      The baud rates are fast enough for contesting yet do not occupy a
      large bandwidth .
      The lower baud rates are more effective, generally, for lower bands
      such as 80 Meters.

      Contest entrants are free to choose any of the available baud rates
      but 11 baud is suggested as a standard .

      Examples of baud rate characteristics:
      DominoEx 5 occipies 244 Hz and transmist charecters at 35 WPM.
      DominoEX 11 occupies approximately 262 Hz of bandwdth and transmits at 70WPM.
      DominoEX 16 occupies approximately 355 Hz of bandwdth and transmits at 100 WPM.
      DominoEx 22 will oocupy 524 Hz and can transmit at 140WPM.
      DominEx 8 is 346 bandwidth and will do 50 WPM.. According to ZL1BPU,
      "...8 baud is wider than 11 baud because it uses double spacing in order to
      combat ionospheric Doppler, which becomes quite a problem with narrow signals.
      Depending on conditions, you can expect 1Hz per MHz operating
      frequency of Doppler,
      so 8 baud on 80m under severe NVIS conditions works well, and
      significantly better than
      11 baud single spaced."

      This mode may be found in three software applications,:

      ZL2AFP DominoEX Software (

      (http://f6cte.free.fr/index_anglais.htm )

      and possiblly for Linux

      Suggested Frequencies :
      Please consult your region's band plan for digital modes. Recently
      reported DominioEx QSOs have been found on

      141075.0, 14107.0 , 14080.0, 14077.0 14076.07072.0 3584.0
      Please consider joining the following groups for discussion of other
      suggested frequencies
      Digitalradio http://groups.yahoo.com/group/digitalradio/
      MFSK http://groups.yahoo.com/group/mfsk/

      Classification 1. Single Operator Multi Band
      2. Single Operator Single Band

      Use of DX Clusters IS allowed. Please consider using the K3UK DX
      Cluster during this contest ( telnet://cluster.dynalias.org )

      Exchange: RS(T) report plus a progressive contact three-digit serial
      number starting with 001 for the first contact. Your log MUST show the
      correct serial number sent and received for each contact.

      Scoring: To facilitate easy use of contesting sofware, we have
      chosen a format that is widely supported. This contest will use the
      same scoring method and rules as
      the CQ RTTY WPX 2006 contest . CQ WPX Contests are organized by CQ
      Magazine , a leading amateur radio publication . This contest is NOT a
      CQ sponsored contest.

      "QSO Points:1. Contacts between stations on different continents are
      worth three(3) points on 28, 21, and 14 MHz and six (6) points on 7
      and 3.5 MHz.2. Contacts between stations on the same continent but in
      different countries, and contacts with maritime mobile stations, are
      worth two (2)points on 28, 21, and 14 MHz and four (4) points on 7 and
      3.5 MHz.3. Contacts between stations in the same country are worth one
      (1)point on 28, 21, and 14 MHz, and two (2) points on 7 and 3.5
      MHz.IX. Multiplier: The multiplier is the number of "valid" prefixes
      worked. A prefix is counted only once regardless of the number of
      times the same prefix is worked.1. A prefix is the letter/numeral
      combination which forms the first part of the amateur call. Examples:
      N8, W8, AB8, DL5, DJ2, HG1, WD200,WF96, 3DAØ, GB75, ZS66, U3, etc. Any
      difference in the numbering,lettering, or order of same shall
      constitute a separate prefix. A station operating from a DXCC country
      different from that indicated by its call-sign is required to sign
      portable. The portable prefix must be an authorized prefix of the
      country/call area of operation. In cases of portable operation the
      portable designator will then become the prefix. Example:AB5KD
      operating from Wake Island would sign AB5KD/KH9 orAB5KD/NH9. American
      DX (KL7, KH6, KP2, KH3, etc.) operating with-in the 48 states must
      sign with a full designator of their choice. KH6XXX operating from
      Ohio must use an authorized prefix for the U.S. 8th dis-district (W8,
      K8, etc.). United States portable stations are not permitted to select
      a portable prefix designation. For example, WS7I/2 is permitted,but
      WS7I/WY2 or WS7I/KZ2 is not. Portable designators without numbers will
      be assigned a zero (Ø) after the second letter of the portable
      designator to form a prefix. Example: N8BJQ/PA would become PAØ.All
      calls without numbers will be assigned a zero (Ø) after the first two
      letters to form the prefix. Example: XEFTJW would count as
      XEØ.Maritime mobile, mobile, /A, /E, /J, /P, or interim license class
      identifiers do not count as prefixes.2. Special event, commemorative,
      and other unique prefix stations are encouraged to participate.
      Prefixes must be assigned by the licensing authority of the country of


      Multiband score = total QSO points from all bands
      multiplied by the number of different prefixes worked (prefixes are
      counted only once).
      Single Band score = total QSO points on the band multiplied by the
      number of different prefixes worked.--

      Log Submission: email to dominoexcontest@...
      Usual contest format for logs. PLEASE include comments about how well
      this mode worked for you.
      Each Entrant will receive a certificate via email.
      Results will be posted on the web at

      Andy K3UK (k3uk@...)
      Fredonia, New York.
      Skype Me : callto://andyobrien73
      Also available via Echolink
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