Just installed and out on the road for a test drive...philw de ka1gmn On Thu, Dec 3, 2009 at 1:51 PM, Patrick Lindecker <f6...@free.fr> wrote:
> > > 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 > > >
