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MultiPSK adding SSTV MP73-N for 30m?

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  • Don
    MultiPSK adding SSTV MP73-N for 30m? GE, Patrick is always adding to MultiPSK (thanks Patrick!) but please note: - Addition of the SSTV narrow mode MP73-N
    Message 1 of 1 , May 29, 2011
      MultiPSK adding SSTV MP73-N for 30m?

      Patrick is always adding to MultiPSK (thanks Patrick!) but please note:

      - Addition of the SSTV narrow mode MP73-N (MP73-N net on 10132 KHz USB, on saturdays, 1700 to 1900 UTC).

      Interesting for those using this narrow SSTV mode on 30m.

      de kb9umt Don


      New release (4.19) of MULTIPSK

      Pour les francophones: la version française de ce message se trouve sur mon site (http://f6cte.free.fr). Il suffit de cliquer sur le lien "Principales modifications (courriel avertissant de la sortie de la nouvelle version)".

      Hello to all Ham and SWL,

      The new release of MultiPSK (4.19) is on my Web site (http://f6cte.free.fr).
      The main mirror site is Earl's, N8KBR: http://www.eqth.info/multipsk/index.html (click on "United States Download Site").
      Another mirror site isTerry's: http://g90swl.co.uk/multipsk/
      Multipsk associated to Clock are freeware programs but with functions submitted to a licence (by user key).

      The main modifications of MULTIPSK 4.19 are the following:

      1) Decoding of the HFDL ("HF ACARS") mode
      The HFDL mode permits automatic transmissions between planes and ground stations, with an exchange of different pieces of information (positions, frequencies...). It is a global service proposed through a worldwide network of HF stations.
      Several speeds (300, 600, 1200 and 1800 bps) and two different interleaving (short of 1.8 sec and long of 4.2 sec) are proposed.
      The receiver should be in USB mode. The bandwidth must extend from 300 to 2600 Hz with a relatively flat frequency response. The central frequency is equal to 1440 Hz.
      The soft automatically decodes the speed (300, 600, 1200 or 1800 bps) and the interleaver (short of 1.8 sec or long of 4.2 sec).

      This mode is available for licencied copies, only (otherwise, the decoding is stopped after 5 minutes).
      See specifications further on.

      The HFDL_display utility (freeware) by Mike Simpson displays details of the aircraft heard, current freqs in use...:
      · See http://www.rstools.info/Public/HFDLDisplay.jpg for a screenshot,
      · The zip file, with instruction .pdf file and installer, is available at http://www.rstools.info/downloads/HFDLDisplay.zip

      2) Decoding of the IEC 870-5 mode
      The "IEC 870-5" is a professional protocol based on ASCII used by DCF39/DCF49/HGA22 stations in Long Waves for remote control of equipment.
      This mode is only available for licencied copies. Refer to the Multipsk handbook for specifications.

      3) Display of the frequencies relative to the mode in progress
      When the blue button "QRGs" ("Frequencies" in Q code) of the RX/TX screen is pushed, the frequencies specifically used for the digital mode in progress are displayed. It is, afterwards, possible to transfer these frequencies through Commander (DXLAB) to the transceiver.

      4) Improvements:

      - Tracking recording
      This function is useful to monitor the decoding text. In case of odd or interesting decoding, it is easier to record only the 15 or 60 last seconds so to play a short WAV file (available in the "Recording on a .WAV sound file" window on the Configuration" screen). This function is available for licencied copies, only.

      - QSO Export to eQSL
      Several options are proposed in the Logbook window ("Logbook" button), to give the possibility to export a QSO to the eQSL WEB site, while recording a QSO (by pushing on the "QSO->Log" button or on the "DXKeeper" button).

      - SELCAL: each minute, automatic recording of SELCAL received data (button "Auto.").

      - Addition of Olivia-64-2000 and Contestia-64-2000 sub modes (for Mars users).

      - Addition of the SSTV narrow mode MP73-N (MP73-N net on 10132 KHz USB, on saturdays, 1700 to 1900 UTC).

      - Addition of new display options in GMDSS ("Other options GMDSS" menu).

      - Addition of the Start-Stop mode in HELL 80. Multipsk gives the possibility to transmit in Start/Stop mode for QSO with real Hell 80 machines, the goal being to reduce paper use. The reception is still done in synchronous mode.

      Note: Hell 80 QSOs are done on "Start/Stop" mode every Monday morning (11:00 to 12:15 local Western time (UTC+2 in Summer and UTC+1 in Winter)) by the Hell-80 net of Remmelt, PA0RJW on 7050 KHz.
      For a description of the HELL 80 mode, click on"Specifications" on the F6CTE WEB site (thanks to Frank F/N4SPP).
      See also www.hellschreiber.com (thanks to Frank F/N4SPP).

      - Possibily to transmit in 110A in 75, 150, 300 or 600 bps (150 bps and more, for licencied copies only)
      Note: the <Auto TX> and <Auto RX> must be disabled (extracted) to transmit in 110A.

      5) Possibility to start the speech synthesis (pronunciation of the decoded text in English or French) directly from Multipsk, by clicking on the on the button. Click on the <Options> menu to access to the "Options for the speech synthesis"',

      6) Possibility to select one line in the panoramic screen with one click (the line background color switches to yellow).

      7) New TCP/IP commands:
      · BANDWIDTH [AF bandwidth in KHz] (2.5, 3.3 or 4.3): permits to control the AF bandwidth of the AF spectrum or waterfall
      · VERTICAL_POSITION_OF_THE_RX_TX_WINDOW xyz ("xyz" is the vertical position, for example 0 or 600)
      · LOCK [ON or OFF] (ON or OFF of the "Lock" button position (automatic locking on the frequency))
      · ALL_HFDL_PDU_DECODED (All HFDL PDU buttons ("SPDU", "MPDU", "LPDU", "HFNPDU") are pushed )
      · SPEECH [ON or OFF] (ON or OFF of the button (speech synthesis)
      · SPEED_110A (speed "75", "150", "300" or "600" bps), for the 110A in transmission (for licencied copies only)

      Note about translation of Multipsk.exe and Clock .exe: the version of Multipsk/Clock has been completly translated to Spanish by Joachin (EA4ZB), from French. The translation file is on my Web site (http://f6cte.free.fr/Translation_files.htm).


      Description :
      Baud rate: 1800.
      Modulation : 8PSK (not differential, the exact phase being determined through known data) with a central frequency of 1440 Hz
      Reception mode: USB
      Shape of pulse : raised cosine
      Bandwidth : about 2.3 KHz (300 to 2600 Hz)
      Demodulation : coherent
      Synchronization : automatic using the known data
      Convolution code: yes. The constraint lenght is equal to 7 bits,
      Interleaving : yes. Two interleavings are proposed: short of 1.8 sec or long of 4.2 sec.
      Lowest S/N: about + 2 dB at 300 bps and more for higher speeds (the signal to noise ratio must be, in general, very good, to be able to decode this mode),
      Each frame contains a prekey (fixed carrier), a synchronization preamble phase where the sub-mode is defined and a data phase where the unknown data is transmitted (mixed with known data to follow the transmission characteristics).

      The transmitted data units are the following:
      * SPDUs ("Squitter Protocol Data Units") are sent regurarly by the ground station to inform aircrafts,
      * MPDUs ("Media access Protocol Data Units") support transmissions between ground station and aircraft, mainly by identifying themselves and by introducing LPDU,
      * LPDUs ("Link Protocol Data Units") mainly manage the protocol between ground station and aircraft (Log on/ Log off/Requests handling...),
      * BDU ("Basic Data Units") are the segments of an HFNPDU,
      * HFNPDUs ("High Frequency Network Protocol Data Units") permit transmission of information (positions, fréquencies, reception performances...).

      An adaptative equalization is required at this speed (1800 bauds).
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