[TenTec] Omni Vi and DSP

[Duane A Calvin]

Your mileage my vary, Ken, but I used an NIR-12 exclusively on other rigs
before I bought my Omni VI+, and never even attached it to the Omni
because the resulting NR was so much better on it.  It is NOT the same
design NR as the NIR's and the Timewaves.  As I understand it, the TT DSP
routines are built to explicitly improve S/N ratio, not to simply reduce
noise (and sometimes the signal with it.)  From my experience, there were
certain kinds of conditions where it will not work as well as others. 
That is also true of both Timewave and JPS, although they may not always
coincide, so the use of a 2nd DSP may well help you.  Remember also that
the Omni's DSP is done in the AF stage, not the IF.  One more thing, the
low pass filter is also part of the DSP, as is one or two others that I
can't remember at the moment.  Hope this helps a little.

        73,  Duane


On Mon, 16 Jan 2006 13:23:38 -1000 Ken Brown <ken.d.brown at verizon.net>
writes:
> Hi all,
> 
> A question posted on another reflector got me to thinking about the 
> 
> built-in DSP in my Omni VI. The only control the Omni VI has for 
> it's 
> DSP the NR button which essentially works as an on/off control. It 
> is 
> unclear to me, from the narrative description of the DSP operation, 
> 
> whether there is any other control to the DSP system which might set 
> it 
> for optimum DSP algorithms depending on what mode (CW/SSB/FSK/FM) 
> the 
> radio is operating. I suspect that there is no such control, and the 
> DSP 
> has just two modes, on and off. Anyone out there know any more about 
> 
> these details?
> 
> Also I wonder about connecting an external audio DSP unit such as a 
> JPS 
> NIR-12. This unit has various front panel controllable functions, 
> which 
> presumably could make it work better than a DSP that only runs one 
> fixed 
> algorithm, as I suspect the Omni VI's does. Or maybe it would just 
> be 
> more knobs to twiddle with no real performance advantage. I suppose 
> if I 
> were to try out the NIR-12 with the Omni VI, I would want to get 
> audio 
> from the Omni VI BEFORE it has gone through the Omni VI's DSP, and 
> not 
> from either the Omni's speaker output or "FIXED AUDIO", which are 
> both 
> AFTER the Omni's DSP. I am interested in hearing from anyone who has 
> 
> already tried an outboard audio DSP unit with an Omni VI.
> 
> Thanks,
> 
> 73 DE N6KB
> 
> 
> 
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--------------------------------------
Duane Calvin, AC5AA
Austin, Texas

http://home.austin.rr.com/ac5aa