[TenTec] Inrad Omni VI Audio mod

[Curtis Rossow]

I have installed the mod to my Omni VI opt3. I also have the installation 
sheet that gives a summary of the improvements. They give some photos of 
band pass sweeps to show the difference in response, unfortunately the 
after conditions uses Inrad filters #745 and #755 in place of the stock 
Ten-Tec filters. My observations are only using my ears.

They say that the low end of the band pass cutoff on the stock rig is at 
350 to 400 Hz at -3dB while the modified rig shows a cutoff of 250-300 Hz 
at the -3bd point. This is done by changing a capacitor in the PBT 
circuit. I like the way the modified rig sounds. You can have the old 
sound by adjusting the PBT frequency by tuning the PBT knob.

The other mod is to change capacitors C3 and C29 on the IF/AF board to 
reduce the high frequency roll off. This gives a flatter IF response. It 
does sound better.

They provide both leaded  and surface mount caps for both the older and 
newer Omni's. You will use only one type.

I think that the mod is well worth the $15.00 even if there are few parts 
to change. The installation sheets are worth the money


Curt NU7R

On Wed, 25 Feb 2004 13:40:41 -0500, Mark Erbaugh <mark at microenh.com> wrote:

> I was browsing the Inrad website and they have a mod for Omni VI SSB 
> audio.
> They don't go into much detail. It cost $15 and takes half an hour to
> install. Has anyone done this mod? Is it worth it? I don't really have 
> any
> complaints about SSB audio on my Omni VI.
>
> 73,
> Mark
>
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