Call Paul Clinton at TT..there was something I remember about the Mic
connector not being grounded...
I had a Orion 1 early on...but now I forget the details. Have the
OII...no issues
73,
Lee
-----Original Message-----
From: PC Anderson <xtraham58@hotmail.com>
To: tentec <tentec@contesting.com>
Sent: Tue, Jan 31, 2012 5:58 pm
Subject: Re: [TenTec] Oll & RF @mic input.
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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