[NLRS] WSJT Modes and SDRs

[Duane - N9DG]

-- "John (JK) Kalenowsky, K9JK" <hamk9jk at ameritech.net>
wrote:
 
> SO...my question: Would it require TWO computers to "do"
> WSJT Modes with a(n) SDR?

No it does not require two PC's (in the case of the
SDR-1000/PowerSDR). Currently there are two options:

1. A single PC with two sound cards and some simple patch
cables between them. The SDR's soundcard output feeding the
second sound card dedicated to WSJT or any other sound card
mode program.

2. Use a "Virtual Audio Cable". In this case the WSJT or most
any other sound card program uses the VAC as its "sound card"
and the SDR program "patches" its audio output into the VAC.
So in this case a single physical sound card is all that is
needed. This method works quite well with most any of the
popular sound card base programs out there.

> It would SEEM that, ultimately, software could created for
> the SDR to encode 
> and decode the WSJT "modulation" directly withOUT a need
> for a second 
> computer to "do" the WSJT part but I don't know if it has
> progressed that far as of yet.

The VAC approach is close to this, so yes it has progressed
this far. In Flex Radio circles there has also been talk of
creating a "virtual sound card" to do essentially same thing
that the virtual audio cable can now do but look even more
like a sound card to the sound based application. The virtual
sound card effort has been put on hold for now since the
virtual audio cable solution was uncovered and does most of
what the virtual sound would provide (the virtual audio cable
being an independent software product not development by
anyone directly involve with the SDR-1000).

BTW there is also a virtual com port "driver" that works with
the SDR-1000/PowerSDR system that was developed by one of the
programmers closely associated with the Flex Radio SDR-1000.

Hope this helps.

Duane
N9DG


		
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