[hpsdr] Digital Voice and HPSDR

[John Petrich]

All,

I want to follow up and correct mis-information imbedded in my comments to 
the reflector copied below.   I want to attribute these clarifications to 
off-reflector discussions with Tony, VK3JED, and Kirk, K6KAR.  The purpose 
of these follow up comments is to stimulate interest in other operators to 
try the DV mode.  Also, I cannot believe I am the only one so clueless 
regarding DV, and I hope my thoughts might help others.

The various DV software applications, DRM, FDMDV, WinDRM, plus others, are 
best viewed essentially the same as one views the various PSK related 
digital modes.  These applicatons are not interoperable.  I thought that 
they were interoperable, like various versions of the Windows OS are 
interoperable.  No.  Each DV mode is unique.

Another wrong assumption was that I thought that DRM = DV on the PowerSDR 
GUI for HPSDR.  Not so.  It is best to approach DV on HPSDR the same way one 
would approach any of the non-DV digital modes.  In essence all one needs is 
to enable the proper pathway for digital operation in PowerSDR, enable VAC 
and enable the proper DV software application.  The remaining challange is 
to try and find someone to talk to.  The calling frequency for 20 meters is 
14.236 MHz.

It seems that DV operation is within reach of any of us who want to try DV, 
the same way that PSK, Olivia, etc are in reach.

Hope to see some of you on DV, soon.

John Petrich, W7FU


> Quite a number of you responded, on and off the reflector, to my 
> questions.
> I want to acknowledge the fine help offered by each and everyone of them:
> Walt, K5WH, Tony, VK3JED, Glenn, WB6W, and good 'ol Ken, K9VV.  Thanks 
> guys.
>
> The take away messages for me are these:  Digital Voice (DV) should play
> just fine thru the PowerSDR DSP.  The DV stream should be processed as an
> odd, but otherwise manageable, audio input or output by PowerSDR.  Amateur
> DV is very much "experimental", which is a great opportunity.  The
> "experimental" aspects include the development and release of a robust 
> open
> source Codec that permits a higher bit rate than present systems, adoption
> of the Codec by enough people to allow us to talk to someone else over the
> air, and organizing around the details of getting the new software to 
> "work"
> in the real world amateur station.  There are a couple of available DV
> applications, WinDRM and FDMDV that will allow one to copy shortwave
> broadcast stations that use DV, and will also permit DV QSO's with 
> similarly
> equipped amateur stations.  These applications are not ideal or an end in
> themselves but are important stepping stones in the development of a DV
> system that someday we might use for routine communication purposes.  I
> remember the very early days of SSB and wonder how lonely those hams felt
> while they tried to find another ham to communicate with.
>
> What I am going to do is to look more carefully into FDMDV and at least
> monitor some SW DV broadcasts.  In the longer run, I'll keep my eyes and
> ears open for the next phase in Codec development.
>
> If anyone is interested in learning more, contact me and I can supply some
> URL's that might be helpful.
>
> Regards,
> John Petrich, W7FU
>
>
> 


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