1909 Fairview Rd.
Camden, AR 71701
Simplex is a Windows based program to control
simplex repeater functions using a parallel port on a computer.
The features of the program are :
The minimal requirements to run the program are :
Simplex uses the following pins on the printer port:
Simplex uses Anjan Rakshit's VBIO.DLL which is included in
VBIO23.zip...It should be unzipped and vbio.dll placed in
windows system directory..Simplex uses the input and output
of a windows compatible sound card for record and playback..
Hook the low level output for the radio to the mic input and
the speaker output to the mic input of the radio..Hook the
COR and PTT lines to the radio...When the COR line is triggered,
Simplex will start to record...When the COR drops, Simplex
waits aprox. 1 second then keys the PTT line and starts to
play the wave file..At the end of the wave file, Simplex
drops the PTT and waits on the COR line again..
Here is a screen shot of the output screen.
For a simple controller schematic..Click here..
If this sounds like something you are looking for you can
download it here...SIMPLEX.ZIP
If you find it useful or have a suggestion you can send me