Hi. I am interested in implementing a slow half duplex link (as fast as
I can, im told its possible to do 33.6k these days, although 9600 and
below is more common place). I have a good radio for this as it has
"option connectors" where I can inject or grab the signal at any stage
of the audio processing and thus avoid pre/deemphasis and filtering etc
if required. What is going to be the simplest way to do this? The
company that built my radio told me that the firmware of the radio would
have to be re-written to support their hardware FFSK modem, which
despite physically plugging in to my model, its really for another model
for which they use the same PCB. They suggested that a seperate modem
with buffering and flow control should be used through the option
connectors. Does anyone have any experience in this area and can you
help with advice of semi-off the shelf hardware that would be a good
starting point for this project?

Thanks,
Ant

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Systems Administrator       
Pracom Ltd.             
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