A QDS signal/wave question

[Guest guest]

I finally seem to be getting a pretty good signal with the Focus, but

now the waveform is looking a little strange. It seems to kind of

modulate up and down, sometimes pretty radically, almost in a sine

wave like pattern. I made some screen captures if anyone wants to take

a look and tell me what they think (click thumbnails for larger images):

http://datalink.homelinux.com/~jeff/nfbk/jpg/qds/sinewave.html

sometimes it's even more pronounced than those, with the wave going

off screen completely, but I think you can get a pretty good sense of

it from those, esp. how in #5 for example it goes off screen at second

3 and stays off for the rest of the screen.

when it comes back in, it will often " dive bomb " as a straight line

(no Hz " ridges " ) down through the other two lines and out the bottom

of the screen before coming back up to more " normal " again. what could

be going on with that?

Btw, I was using saline earclips with silver electrodes and a silver

electrode with 10/20 at F8. This is also on a desktop computer (using

AC of course), though it doesn't look like the 60Hz problem, but

possibly something different. Or maybe I'm just being paranoid about

it, but I'd like to know for sure. I just can't afford any worsening

from bad signal, etc., and I seem to have gotten a little bad training

from this yesterday, as it was doing the same kind of thing on my laptop.

regards,

JW