Re: No Sound Card digital modes
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Hi All
The use of audio as the universal way of transferring digital Signal modes between a PC and a radio transceiver makes lots of sense in many ways. Every radio transceiver for more than a century has an audio output and if it's a phone transceiver, an audio input. So the digimodes software writer knows that his software will be automatically compatible with every radio in excistence.?
The moment a Digi mode software starts producing custom ways of sending out digital symbol information, it's no longer compatible with anything. And every radio model then has to update it's capability (if it even is possible) to handle these messages.?
So it's not really a logical direction.?
The way QDX and QMX are designed with the built in USB sound card emulation, the transfer of audio between PC and transceiver is lossless, distortion free, hum free, etc. It's quite straightforward and fast, and incredibly accurate, measuring the audio frequency and applying it at RF. So the system as it stands, doesn't cause any problems and wouldn't be improved by any other method.
On Sat, Aug 26, 2023, 1:24 PM Vojislav [YU4HAK] < batica@...> wrote: Wsjtx does however at least show what is being sent and received in two places other than the screen. In the UDP data stream, and logged in the all.txt file.
What I managed to do for my experiment is to track the all.txt file with a small node.js app, encode that message to ft8 frequency offsets and send that number via serial port to the Arduino that controls the si5351.
It is clumsy but it kinda works. And no visible latency either.?
While this is far from finished and useful, it is an idea how annoying "audio coupling" between wsjtx and a transceiver that does direct signal generation can be done with a small software shim.
In theory, it wouldn't be too hard to add optional "current message output" to existing wsjtx cat serial data, but haven't explored that yet.?
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