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Re: [TenTec] Omni V buzz on 14 mHz

To: <Gary@doctorgary.net>,"Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Omni V buzz on 14 mHz
From: "Denton" <denton@oregontrail.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 15 Dec 2007 08:23:01 -0800
List-post: <mailto:tentec@contesting.com>
Sounds like something is overheating, or a nearby connecting cable is too 
close to a chip?
----- Original Message ----- 
From: "Gary Smith" <Gary@doctorgary.net>
To: <tentec@contesting.com>
Sent: Saturday, December 15, 2007 8:06 AM
Subject: [TenTec] Omni V buzz on 14 mHz

> I'm buzzing... Well, the Omni V is anyway.
> My Dad had this Omni V and there was an intermittent sound it would
> make that he couldn't ID its cause. When he sent it back to TenTec
> they did all the factory mods but the sound didn't show up while it
> was there. He mothballed it and now I've got the radio.
> After first using it (a month ago) I did hear what is likely to be
> the same sound he was hearing, I called TenTec to see what they
> thought and I was suggested to reset it. Doing so did stop the noise
> and I began using/learning about the radio. It came back again and
> I'd ordered N4PY's V.92 chip and hoped among the other things it
> exorcises, it might fix the noise issue as well. Alas, no such luck.
> I've been using it exclusively and with no difficulties on 40 & 80
> meters. With the exception of background internal noise of what are
> possibly as mentioned here from old leaky caps, the radio has been
> exceptional on receive and I thought a solder joint I secured which
> fixed the display might have been the solution. Not so.
> I finally put it on 20 meters & after 20 minutes or so this noise
> started again. I went back to 40 meters and the receive was normal.
> Aha! so I let it sit on the other bands and they are fine too; it's
> only on 20M that the radio generates this noise.
> To describe the sound, it is like the old "Fuzz" sound from a 60's
> rock group. It is overpowering in volume but is not reflected on the
> S meter. I can still hear stronger cw in the background but the tones
> are not pure, they consist of buzzes at different pitches.
> On my old corsair when I would turn the noise blanker all the way up
> in the presence of line noise it would have much the same character
> to the CW signals; I would hear them as if it were an old spark gap
> kind of character. Speaking of the noise blanker & the similarity to
> the corsair noise as just described, the noise blanker in this radio
> does not seem to work. If I turn the control clockwise nothing
> happens for 90% of the travel and there is a narrow area of effect
> and then at the last 4-5% of clockwise travel it completely cuts off
> any sound and the S meter goes dead. I did check the adjustment and
> it is indeed working, varying the voltage from around 5v to zero.
> Back to the character of the  sound I'm asking about; the sound varys
> but does so by immediate change in pitch, no gradual shift. It is a
> wall of sound constant and only the pitch changes.
> When I switch to a different band the problem again goes away but if
> I immediately go back to 20, the sound is gone. It invariably returns
> but there's no telling when that will be. It's a workable workaround
> but sometimes the sound returns within moments & sometimes it's OK
> for a long time.
> I haven't gone into the lower part of the radio but did open the top
> to see if I could cause any change in the sound by jarring any boards
> & components, and I could not make any change. Only resetting the
> radio or changing bands stops it.
> Any ideas where I might look & try to do as it's only in the 20
> meters setting that the little gem of a noise happens?
> Thanks,
> Gary
> KA1J
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