[TenTec] Microphonics/Feedback from Omni-V.9?

[Robert & Linda McGraw K4TAX]

Indeed if the monitor level is turned up it can cause the problem.  Also, in
both the Omni VI+ and the 2 Paragons, there is some degree of mechanical
coupling between the speaker and the audio board located immediately below
the speaker.    There is a good bit of gain in that circuit and should a
component be microphonic it can contribute to a howl.  I used a couple of
small wedges cut from rigid foam packing material to "tighten up" the audio
board.  Solved all the problems for me.  It was a trial and evaluate project
which took only 10 or 15 min to solve.

73
Bob, K4TAX


----- Original Message ----- 
From: "t m" <wa1jvv at yahoo.com>
To: <tentec at contesting.com>
Sent: Tuesday, May 11, 2004 6:59 AM
Subject: Re: [TenTec] Microphonics/Feedback from Omni-V.9?


> Is MONitor on?
>
>
> --- John Pfeifer <jpfeifer at gci.net> wrote:
> > Hello all,
> >
> > I usually operate with headphones, but this morning turned on my Omni
> > V.9 with
> > them unplugged.  As I advanced the AF gain, I started getting low
> > frequency
> > feedback.  The only way I could stop it was to turn the AF gain all
> > the way
> > down.
> >
> > I was *not* transmitting at the time.  In fact, as an experiment, I
> > unplugged
> > everything from the rig except the power supply.  Still got the
> > feedback.
> >
> > It's almost like something is causing microphonics inside the rig.
> > With the
> > AF gain just barely on, I can start it feeding back with a slight tap
> > on the
> > case.
> >
> > Any ideas, suggestions?
> >
> > Tnx/73,
> >
> > John Pfeifer
> > KL0WN
> >
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>
>
>
>
>
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