Thank you very much for this tip. I was afraid to put caps on the sda/scl lines and now I wish I had. Thank you very much :-)
py2wm wrote: > > .. I have had trouble controlling the > > WB6DHW board probably because of RF feedback and bad grounding on my > > part. > > I've also had this same problem while controlling the Si570 chip from > the PC parallel port. The symptom was the chip not giving out the > correct frequency or simply not obeying to the software. The problem > went away after I added 33pF capacitors at the SCL and SDA inputs > (header H2) in WB6DHW board. The capacitors leads must be as short as > possible, SMD types are prefered. The 33pF value is good to the > intended range (10-200 MHz), a higher value may distort the shape of > the parallel signals. > > It now works smoothly, I specially enjoy SWLing using I2PHD's Winrad > which does a fine job of controlling the 570 chip with PE1NNZ's DLL. > > 73, > > JK De Marco, PY2WM > > -- Regards, John ========================================================= email: [EMAIL PROTECTED] photos: http://www.flickr.com/photos/k5jhf/sets/ videos: http://www.youtube.com/profile?user=k5jhf files: http://briefcase.yahoo.com/[EMAIL PROTECTED] web page: http://www.geocities.com/[EMAIL PROTECTED] call sign: K5JHF =========================================================
