[hpsdr] FreeDV, PowerSDR and Penelope

[Scott Traurig]

What you are hearing are the completely normal artifacts the FreeDV
waveform produces with no voice modulation. It is attempting to decode
noise and that is the sort of beep and garble you get under those
conditions.

Try transmitting some actual voice.

73,

Scott/w-u-2-o

On Sun, Oct 27, 2019 at 6:39 AM Michael Carey <michaelcarey at internode.on.net>
wrote:

>
> Hi Everybody,
>
> Does anyone in here have any experience with using FreeDV 1600 together
> with PowerSDR and the OpenHPSDR hardware?
> This weekend I have been trying to get FreeDV working with my HPSDR
> setup (PowerSDR v3.4.9).
>
> The basics are all working fine, VB Audio's Virtual Audio Cables work
> great and a pair of Virtual Serial Ports allow CAT control between
> PowerSDR and the FreeDV software for PTT.  I've used the same setup for
> decoding DMR and for use with FLdigi/WSPR for some time now.
>
> I am using a Rowetel SM1000 with my Icom IC-7100 to receive the FreeDV.
>
> When transmitting FreeDV 1600 via OpenSDR/Penelope it sort of works, but
> I am seeing/hearing a regular "glitch" in the transmitted audio that
> affects decoding via the SM1000.  It doesn't matter if I reduce the VAC
> audio gain, the glitch is still there.  I believe I've turned off any
> kind of processing that might affect transmit, but it still isn't as
> clean as what I can get with the SM1000/IC-7100 setup on transmit.
>
> I've uploaded short unlisted video to my YouTube channel that shows what
> I am seeing/hearing on transmit.
> https://youtu.be/Fnc4W_ZXC0g
>
> The audio going into the VAC on PowerSDR from the FreeDV software sounds
> clean when I listen to it, as does the audio when I listen with the
> PowerSDR MON turned on.
>
> I haven't even looked at the reverse path yet, transmitting on the
> SM1000 and receiving via the HPSDR. One step at at time. :-)
>
> Any ideas?
>
> Michael.
> VK5ZEA
>
>
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