[TenTec] O II RF distortion in SSB audio

[Ron Castro]

I have documented that problem on my website, www.n6ie.com as RF getting in 
through the headphones cable.  There is a free factory mod that fixes the 
problem with a filter board that plugs into the audio board located inside 
the front panel of the radio.  You can verify if that's the problem by 
wrapping the headphones cables around a ferrite loop as close a possible to 
the connector.  The board cleared up the RFI 100%.

On my O2, the problem was worst on 10 meters with the amp on and the beam 
pointed in the general direction of the shack, although I suppose a lot of 
other combinations of power levels, frequencies and antennas could cause 
similar problems.

                     Ron N6IE
                         N6IE
                www.N6IE.com



----- Original Message ----- 
From: "M. Todd Miskel" <kt0dd at bresnan.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Saturday, May 26, 2007 5:24 AM
Subject: [TenTec] O II RF distortion in SSB audio


> Hello all, I love my OII, but am struggling with RF garbage getting back
> into my TX SSB audio. I have been diligent with all the basics, grounding,
> physical separation of equipment, using ferrite chokes etc. Yes, I am in 
> the
> near field of my antenna but unfortunately I am on a very small lot and 
> not
> many options are available to me on moving my antenna.
>
> My question is why do I have NO problems with my 706MKIIG in the same
> situation? Is it inherant that a hot front end like Orion is just more
> sensitive to RF, or has TT missed the ball somewhere in shielding the 
> Orion?
> I would really like to keep the OII, but if I can't clean it up, I may 
> have
> to change. The rig has been back to TT for repair of another item and has
> had a recent bench check with an all ok checklist done. Any replies are
> appreciated as always. 73, Todd - KT0DD
>
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