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Restore 'free text' encoding support #40

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Restore 'free text' encoding support #40

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@kholia kholia commented Dec 11, 2023 •
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Before this PR:

$ ./gen_ft8 "U09TUNQUC9ZH12" eifel.wav 850
Cannot parse message!
RC = 1

After this PR:

$ ./gen_ft8 "U09TUNQUC9ZH" eifel.wav 850
Packed data: 65 5d 15 26 47 bc 89 30 08 00 
FSK tones: 3140652213645361155247553320010005223140652043464134672561142261533033043140652

WSJT-X decodes eifel.wav just fine.

Screenshot_2023-12-11_08-58-06

The U09TUNQUC9ZH happens to be the Geohash for Eiffel Tower's coordinates.

Screenshot_2023-12-11_08-58-51

This Geohash feature can be used to be build a "New APRS" system for HF.

@kholia
Fix compilation on Ubuntu Linux
fc87d96 
Without this change:

```
$ make
...
demo/decode_ft8.c:347:31: error: ‘CLOCK_REALTIME’ undeclared (first use in this function)
  347 |                 clock_gettime(CLOCK_REALTIME, &spec);
```
@kholia
Restore 'free text' encoding support
f215ced
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@kholia