Hi Bob, P3 behave as you described if serial connection is broken.
Check serial cable integrity, probably bad contact on connectors.

Edu YY4GMJ

On Mon, Jun 24, 2013 at 9:06 AM, Robert Sands <[email protected]> wrote:
> Awoke at 5 AM to make coffee and begin my final fun for Feild Day Sunday
> morning. Cool and damp in boat saloon. Turned on K3/P3 and noticed change
> in screen. P3 showed, for the first time, my signal on transmit but nothing
> on receive. Over the next 20 minutes this changed back to normal. It was
> nice to see my own signal. Also the "green passband" was missing. It is
> fine now. Cold? Dampness? Can I reproduce seeing my own signal without
> putting the P3 on ice?.
>
> K3 worked great. Got many comments like "strongest signal on band" with 100
> watts and 2 el vertical beams on 15 and 20 over saltwater.700 contacts and
> 7 hours of sleep. The K3 processor is the best ever! Set at 20-25 for
> contest.
> Bob
> K7VO
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