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@bresnan.net>
To: "Discussion of Ten-Tec Equipment" <tentec@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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