Slow Matrix Transmitter

Version V1.6a

by

HB9JAQ

Slow Matrix Transmitter is an amateur radio soundcard digimode software for experimental transmission of low power/low speed signals over an SSB transmitter. It transmits audio encoded characters in a 5x7 pixel matrix font that can be made visible at the receiving side by an FFT spectrum analyzing software like Argo, Spectran, SpectrumLab or any QRSS signal grabber available on the Internet (see example below). The user interface is simple and self explanatory. The program can be run on Windows XP or higher. It is freeware for amateur use. To download Slow Matrix Transmitter right-click the link at the bottom of this page and then click "save target as". This software is under development. Return to this page from time to time to get the latest version. 

 

Version

Modifications

V0.0

First beta release with mode "Concurrent Multitone Hell" (C/MT)

V0.1

Fade in and fade out respectively at the beginning and end of column transmission for smooth and narrow b/w transitions

V0.2

Display of average and peak power, tuning function

V0.3

Display of average power over whole message, information in fields "Text to send", "Loop" and "Pause" saved in .ini file

V0.4

Checkbox "Loop" and edit control "Pause" accessible even in transmit mode

V0.5

Mode "Sequential Multitone Hell" (S/MT) also supported

V1.0

Cosmetics in main dialog, documentation added, first production release

V1.1

Length of text to send (in characters) in dialog; solved issue with Umlauts and other characters (were transmitted as blanks before); support for pilot tone

V1.2

Introduction of a logfile (see menues File & View)

V1.3

Checkbox "Reverse"

V1.4

Support for transmitter PTT control (CAT)

V1.5

Correct display of the time remaining to send the text even after a transmission is stopped; in loop mode a transmission interval (consisting of text transmission and pause) can be specified rather than a pause only

V1.6

Edit control "Sent text" always scrolls to the left (so the last characters of the text sent are always visible); "Duration per pixel column" specified in milliseconds rather than in seconds (valid values from 300 to 60'000)

V1.6a

Error correction with high values for field Duration

Slow Matrix Transmitter V1.6a