[TenTec] Omni Vi and DSP

[Robert & Linda McGraw K4TAX]

The Omni VI Plus DSP has two functions.  One is noise reduction NR and the 
other is Auto Notch.  The NR algorithm is tailored basically for SSB noise 
reduction with minimal impact on voice.  It works equally well on CW.  The 
AutoNotch is just that.  It looks for and at constant tone values and 
rapidly creates a very sharp notch of some 40 dB, more or less depending on 
tone frequency and the number of notches it is required to generate.

As to external DSP units, I use a Timewave DSP-9+ with great success.  It 
connects in-line between the external speaker output and the external 
speaker.  The 13.8 volts is obtained from the rear panel 13.8 V jack on the 
Omni.  It offers several features that is not offered in the Omni VI Plus in 
addition to bandwidth shaping and decoding for RTTY mode.

In either case both DSP systems are audio only processing, therefore a tummy 
full of 9 MHz IF filters and 6.3 MHz IF filters are of great value.

73
Bob, K4TAX

----- Original Message ----- 
From: "Ken Brown" <ken.d.brown at verizon.net>
To: <tentec at contesting.com>
Sent: Monday, January 16, 2006 5:23 PM
Subject: [TenTec] Omni Vi and DSP


> 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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