Wow... I moved the TR Switch on the back to RX and it operates EXCELLENT
without the attenuator on!
On Sun, Dec 30, 2012 at 11:40 PM, Ralph Matheny K8RYU <mathenyr@marietta.edu
> wrote:
>
>
> I chased a similar problem in my Omni-V a few years back. It turned
> out to be a TR switch problem. You can test this idea by pulling the
> input to the Rx board, or even switching to the Rx antenna using the
> slide switch on the back panel.
>
> As I remember, the circuit uses a little RF from the Tx signal to
> make a voltage to cut off the diodes fully. I think I found that
> even lead dress around the LPF board and PA module had a lot of
> effect upon the performance of the TR switch. I'm sorry that I
> don't remember more specifics and I didn't make notes. I suspect
> that a few well placed ferrite beads may make the thing a bit less
> fussy.
>
> My fix, as I remember, was to get the drawing for the Omni-VI
> and make the TR switch look like that model. I have done that
> with a lot of circuits in my O-V and have had generally good
> luck in doing so. There are not a lot of changes between the
> O-V and the O-VI but they are in a sense "perfections" of a
> pretty dern good design.
>
> de K8RYU
>
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