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 ? :
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- 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 :
- 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 :
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- 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.