Dear OM, - If you are a HAM, - If you enjoy CW and meteor scatter, - If you enjoy experimentation, Read this. This mail is about an experimental software to do high speed CW MS TX and RX. You need only a single PC (80286 or more), DOS 3.x (or more), with a serial interface (or parallel in the futur). It work also with WIN95 in a DOS window. You can use it without any special equipment except a HAM TRX (of course) and a very small hardware interface, auto-alimented (1 comparator as a uA741 and 1 optocoupler), just to interface with the RX AF output and the TX keyer input. You can download this software on the host " ftp.ucsd.edu". I put it on the directory "/hamradio/packet/tcpip/incoming ". (tks to Rich AA2YS and Bob N6FRI for info, ftp.ucsd.edu work now). I dont know what apen with this file because the transfert was complet but I cant list the files !!! The name of the file is " CWMSTXRX.ZIP ", about 110kbyte. It contain " .exe ", " .hlp ", " .dtb ", ......files and the complete C source code. This software is a HAM freeware software : you can do what you need with it and the code source. Unfortunately, some files are in French because : - I haven't no time to translate at this moment, - My English is very poor, - And this is just a software experiment (not a full package) : the first time I send it to HAM. But this software work : I use it for many years in TX, and I use it during the last Quadrantide shower with the new DTR interface. What do this software ? : ************************* - It do TX CW call (Aurora, Es, DX, contest, beacon, automatic and periodic high speed CW MS for skeds, ...) - You can access to the DL8EBW VHF database, to search a call, putting only one or few characters, - And you can RECORD a high speed CW meteor scatter burst and PLAY BACK it SLOWLY, to decode (listen) CW at a normal speed (I think the automatic CW decoding is not possible with meteor scatter bursts). The Principe of this DIGITAL TAPE RECORDER is very simple : ************************************************************ 1) RECORDING : - Each front of the RX-AF is sent to the serial input PC interface (with a single comparator). - This front generate a software interrupt. - Each interrupt do : . Compare the timer with the last interrupt timer value, . Record the timers difference in an audio memory buffer. 2) PLAY BACK : - To play back, the software read the audio memory buffer, output a front on your PC HP (with a higher frequency), and wait until the timer = audio-buffer-value * X. How to use this DTR : ********************* - You heard a CW burst then : stop recording at the end of the burst, - Use a software command to play-back the audio-buffer : The you listen the burst with a CW at normal speed !!! Sorry for my very bad English. Enjoy yourself with this experiment and please tell me if you get some chance or trouble. 73 QRO, and good DX. Jean-Pierre MALEZET Packet address = F6FLV@F6KRK.FRPA.FRA.EU Internet address = malezet@MicroNet.fr or 101707,2125@Compuserve.com