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Re: [TenTec] Oll & RF @mic input.

To: <tentec@contesting.com>
Subject: Re: [TenTec] Oll & RF @mic input.
From: PC Anderson <xtraham58@hotmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 31 Jan 2012 17:58:12 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Tnx Carter for the info. Yes, as I mentioned in my question, I remember some 
fixes also from TT.
Can't find them though.

> > 
> On 1/31/2012 5:06 PM, Stuart Rohre wrote:
> > Try coiling up part of a mike cable into an orderly solenoid coil,
> > NOT scramble wound. You can put it on a pop bottle or other pipe
> > form for a test. If that works, you can measure and compute what
> > inductance it was and replicate it with a ferrite core, passing the
> > mike cable thru and around that for fewer turns.
> >
> > If you want to get deep into the radio, see if there are ferrite
> > beads on the mike connector wiring, and if not, add that. Beads web
> > sites usually have application notes on how much equivalent
> > inductance you get per bead and you can put multiple beads if there
> > is room. Insulate the beads from contact with chassis or other
> > conductors.
> This may or may not be the time/place to bring this up, but here goes 
> anyway.
> I've got an Omni VI Option 3 and could never run more than ~ 15 watts 
> without RF getting in to the transmit audio. Tried the above with a 
> ferrite core and no luck. After years of avoiding SSB, there was finally 
> talk here on the reflector about the cause of the problem, ultimately 
> named the "pin 1" problem. (Had something to do with pin 1 on the mic 
> connector and a floating ground or some such between the connector and 
> the PC board).
> I called TT tech support and they sent me a sheet with the suggested 
> fix. However, being a CW and digital op, I never worked on the problem.
> Several years later, when I had need to get on SSB, I could not find the 
> sheet TT sent to me. When I called them to get a new sheet, they 
> disavowed any and all knowledge of the issue.
> So, what is happening here? Am I totally hallucinating? Am I missing 
> something? Does anyone here on the reflector remember the "pin 1" 
> thread? BTW, TT says too much RF in the shack -- but I've had other 
> solid state rigs (Drake TR-7) work fine; also, because of the physical 
> layout of the house/property/trees and zoning and subdivision 
> restrictions, I am not able to re-locate my antenna as suggested by TT. 
> Any fixes -- or is this just an inherent issue with the Omni VI?
> Any thoughts or comments appreciated...
> 73,
> Carter K8VT
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