Hello Brian,

>         $ fdmdv_get_test_bits - 14000 | fdmdv_mod - - | fdmdv_demod - - 
> /tmp/demod_dump.txt | fdmdv_put_test_bits -
>         Error number of carriers must be btween 2 and 20
>         bits_per_fdmdv_frame: 28 bits_per_codec_frame: 56 
> bytes_per_codec_frame: 7
>         bits_per_fdmdv_frame: 28 bits_per_codec_frame: 56 
> bytes_per_codec_frame: 7
> 
>         bits 0  errors 0  BER 0.0000
> 
> Note error "Error number of carriers must be btween 2 and 20" and also
> typo in "between".

True.  Looks like the instructions are out of date.  Thanks for picking
that up.  It appears the modem is also broken in codec2 and codec-dev,
as this:

./fdmdv_get_test_bits - 14000 | ./fdmdv_mod - - | ./fdmdv_demod - -
| ./fdmdv_put_test_bits -

doesn't work for me in the latest codec-dec & codec2, but does work in
an earlier version I have laying around (SVN revision 1342).

The correct output is something like:

"---------------+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---"

The "+ indicate sync.  Not sure why, and it' slate for me here now.
codec-dev is a work in progress (I'm messing with several aspects of the
modem) so that doesn't surprise me.

Cheers,

David





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