Digital voice has been operating on 14.236 since 2007. What I do see is SSB
splatter in your waterfall. The 1+ khz guard channel between "DRM-based SSTV"
and FreeDV FDM is pretty effective in avoiding interference between the two
modes.
Mel
k0pfx
----- Original Message -----
From: David Ranch
To: [email protected]
Sent: Sunday, December 23, 2012 6:19 PM
Subject: [Freetel-codec2] Trying to decode captured FDMDV + Codec2 signal
Hello Everyone,
I'm new to the list but I've attended a few of Bruce Peren.'s Codec2
presentations at the local Pacificon conferences. Much to my pleasure, I
spotted what I think was a FDMDV + Codec2 QSO on 20m today (14.236Mhz). Please
note that the transmitting station was created some splatter that was impacting
DRM-based SSTV on 14.233 so I don't think 14.236 is a safe frequency to use).
Anyway, here is a screen capture of the signal as I was receiving it:
http://www.trinityos.com/PRIVATE/Codec2/fdmdv-waterfall-capture.png
I recorded the signal with Fldigi and thought I'd try to decode it. I
downloaded the current FDMDV code as of today from the Subversion repository
and it compiled right up on my Centos6 platform. I then tried the following
command to decode the WAV files but I didn't get any real voice out of it:
sox /tmp/fldigi-codec2-capture.wav -c 1 -r 8k -t raw -s -2 - |
./fdmdv_demod - - | ./c2dec 1400 - - | aplay -c 1 -r 8000 -t raw -f S16_LE
I tried many different permutations of the various commands but couldn't get
any speech out of it. Since I'm not sure where the
I posted the two WAV files here:
http://www.trinityos.com/PRIVATE/Codec2/
Could anyone help be confirm this was indeed a FDMDV + Codec2 QSO and what I
might have done wrong?
Ps. Fldigi has a very nice feature to playback WAV files and see it in the
waterfall from the "File" command so this might
--David
KI6ZHD
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