New release (4.16) 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 (4.16) 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). Multidem 2.2.4 and Clock 1.8.5 have been slightly modified (improvement of the sound card and mixer management). The main modifications of MULTIPSK 4.16 are the following: 1) Decoding of the STANAG 4285 mode This mode is used in HF for professional transmissions. Unfortunatly, almost all transmissions are encrypted, which limits the interest of this mode Several sub modes (75 to 2400 bps) and two different interleaving (short and long) are proposed. All modes are fixed frequency. The receiver should be in USB mode. The bandwidth must extend from 300 to 3300 Hz (at -30 dB) with a relatively flat frequency response between 600 and 3000 Hz. The central frequency is, in this case, equal to 1800Hz. It can be selected a 1500 Hz central frequency for Ham receivers. It is a first decoding version which is far away to be perfect (the signal must be very good to be decoded). See specifications further on. 2) RS ID, Call ID (Message ID) RS ID Due to the extension of the RS ID use, it is proposed a function which allows to select a group of modes for which the user wants a RS ID detection (function available by clicking on " ID "). Message ID Creation of a Message ID which permits to send small messages of 9 characters maximum which will appear in the waterfall of the other Hams. As it works in background and as it is not related to any specific digital mode, it can be useful, for example, in case of difficulty of doing a QSO. Message IDs are not considered as true Call IDs and are not stored (they are only displayed). For more information, download: http://f6cte.free.fr/The_RS_ID_easy_with_Multipsk.doc http://f6cte.free.fr/The_Call_ID_and_Prop_ID_easy_with_Multipsk.doc 3) New macros: - "<LAST QSO>" transmits all the data about the last QSO done with the Ham which call sign is in the "Call" field. By clicking on "Number?" in the QSO panel, these data also appears, - <SELF REPEATING> permits to automatically repeat the same sequence until the user decides to switch on reception. It is a useful function for tests. This macro must be located at the end of the sequence. -<EXEC:command> permits to execute a Windows command. For example, it provides an easy way to look up call on qrz.com: <EXEC:rundll32.exe url.dll,FileProtocolHandler http://www.qrz.com/db/<CALL>>. Macros which can be directly replaced by a text can be integered to the EXEC macro. This macro is reserved for Hams with experience in computers. See help for details. 4) Improvements of the ARQ FAE mode (in ALE or ALE400) with, mainly, an automatic re-synchronization using the RS ID, the Packet 1200 bauds decoding, the sound card management, the 110A decoding, APRS (Packet, 141A and ALE400). It can be sent a specific icon, for example "Emergency" (in the APRS "Transmission" panel), JT65: JT65 beacon transmitting at each minute. Note about translation of Multipsk.exe and Clock .exe: the 4.15 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). 4285 specifications: Baud rate: 2400. Modulation : 8PSK (not differential, the exact phase being determined through known data) with a central frequency of 1800 Hz Reception mode: USB Character set : different synchronous or asynchronous formats are proposed (5 ITA2, 7 bits ASCII or 8 bits (ASCII+ANSI)) Shape of pulse : raised cosine Bandwidth : about 3 KHz (300 to 3300 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 or long. Lowest S/N (on Multipsk): + 5 dB in 75 bps and + 12 dB in 2400 bps (the signal to noise ratio must be, in general, very good, to be able to decode this mode, i.e "excellent" at 2400 bps and "good" at 75 bps). Each frame contains a synchronization preamble phase (80 symbols), 4 data phases of 32 symbols where the unknown data is transmitted (mixed with 3 known data phases of 16 symbols to follow the transmission characteristics). An adaptative equalization is required at this speed (2400 bauds). 73 Patrick
