I have been doing duty as curator of a DSP library for the Teensy
processors. This has quite a few ham radio classes that now include FT8
T/R based on the work of Karlis Goba and others. This is all intended
for the Teensy 4.x boards that use ARM Cortex-M7 processors.
This note is about a generator that was used to test the receive class
but that might be of interest to folks on this list, as it is a simple,
stand-alone inexpensive gadget that generates audio signals of known
SNR. A description of this is at
http://www.janbob.com/electron/FT8Generator/FT8Generator.html including
links for the hardware and software, including the library. I believe
the signals meet specs and they include GMFK filtering and raised cosine
tones.
The hope is that this might be a useful to others, but in addition, if
anyone sees any problems or bugs, let me know!
Thanks and 73, Bob W7PUA
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