[TenTec] Fwd: OmniVI logic board work

[Glenn]

the key to success with tapping the audio pre-dsp is to add
some analog low pass filtering with a turn-over freq in the
3000-3500hz region and fairly steep roll off.  The Omni 6 is just TOO
hissy/noisy if you don't do this.
Hi Barry,
Yes this is correct and I did have to roll of the his with a simple LC filter..


Glenn



-----Original Message-----
From: Barry N1EU <barry.n1eu at gmail.com>
To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
Sent: Thu, Sep 29, 2011 10:56 am
Subject: Re: [TenTec] Fwd: OmniVI logic board work


On Thu, Sep 29, 2011 at 2:33 PM, Glenn <wa4aos at aol.com> wrote:
> I meant to comment on the Ten Tec O6 audio you mentioned.
> I too ran a remote a pre DSPaudio line to the rear panel on one of my O6.
> I fed that into a combo preamp/amp I designed using a 6CW4 nuvistor as a pre 
amp stage, to drive
> a 6SN7/ 2A3 single ended amp stage... Ahhhhhh such sweet audio for listening 
to SSB; the wider INRAD filters helped as well.
> I simply turn up the front panel audio gain to re-gain DSP/ notch 
functionality.
> I ended up making a mini TR switch internally mounted so that default mode 
uses the DSP path and once the reed relays are
> energized, the audio was redirected to the rear panel.

Glenn, the key to success with tapping the audio pre-dsp is to add
some analog low pass filtering with a turn-over freq in the
3000-3500hz region and fairly steep roll off.  The Omni 6 is just TOO
hissy/noisy if you don't do this.

Barry N1EU
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