--- In [email protected], k5nwa <[EMAIL PROTECTED]> wrote:
>
> I had a case where I clicked the mouse and placed the frequency less
> that 1KHz from a signal, instead I watched it take off in the wrong
> direction for a signal 10KHz away. I was funny, I started talking
> to the computer "Where are you heading off to buddy?" When I
> clicked a little closer it locked in to the right signal.
>
> It should have ignored a frequency so far away in favor of a close
> signal, anything more than 1KHz or more is a good candidate to
> ignore. The offending signal was not even inside my audio filter, so
> taking the input from the output of the audio filter might be a good
> enough fix.
Cecil,
I will try to reproduce that behavior. I thought to have checked
similar cases, but after your report I will spend some more time on
that. The phase delta information used to acquire lock is computed
after a dedicated low pass filter of less than 3 kHz of bandwidth,
which is reduced by a factor of at lest 10 (must check) after locking.
I guess than in your case the initial wandering of the NCO was caused
not because the carrier at 10 kHz acted as an attractor, but it was
simply a random walk, that by chance ultimately entered the capture
range of that carrier. It rest to be understood why the carrier at 1
kHz did not attract the NCO,,,, food for investigations.
73 Alberto I2PHD
