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Re: [TenTec] OMNI 6+ weak tone on receive

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] OMNI 6+ weak tone on receive
From: Gary F <dukeshifi@comcast.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 21 Mar 2017 18:19:41 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Sounds like a compromised ground somewhere.

The Omni 6 had plenty of digital noise. Ten Tec did a lot of good work putting 
grounds here and there, plus some insulator tape here and there to reduce that 
digital noise.

If any of that work is disturbed, you will get this sort of digital hash 
through your audio.

There also may be a bad decoupling capacitor somewhere, allowing digital hash 
to appear in the audio.

Since you can notch it out, you can forget about the noise coupling into the AF 
stages.

Pull the case off, remove the 6.3 MHz filter (or select one of the narrow slots 
that has no filter in it) and see if the tone goes away. Please report back.

Gary

W0DVN

Sent from my iPad

> On Mar 21, 2017, at 1:54 PM, N4IJ . <dougn4ij@gmail.com> wrote:
> 
> Suspect this is an alignment issue but:
> 
> Recently I have noticed a weak tone when on RX.  I can notch it out,  I can
> passband it out too.  If I turn the VFO knob, the tone will disappear while
> tuning and then return once stopped.  This is a weak tone, but gets
> annoying after a while.  A weak signal will mask the tone.  Have not
> measured the freq but would guess 1khz or so, maybe higher.
> 
> 
> Doug N4IJ
> Harrah, OK
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