Thanks to those who suggested the graphics card might be the suspect. Sure enough swapped Windows 7 computers and no crackling.
The 2.80 gig HP with a GeForce 8600 GT card and 4 gigs of memory was the problem. A 3.33 gig E-Machine with a lesser ATI HD4350 card and only 2 gigs of memory ran quiet - no crackling. However the 2 gigs RAM in the E-Machine don't seem sufficient for clean CW. I'll try more RAM but it's looking more and more like a new computer :( Best regards, Peter - VE3HG VE3HG Blog Follow VE3HG On Twitter _______________________________________________ FlexRadio Systems Mailing List [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/

