Original poster: sparks-at-spectrotek-dot-com > Below are some references that I've used based on recent postings and > research I performed for a colleague at work... <snip> Thanks! Lots of useful info in those links. 73, Ralph W5JGV - WC2XSR/13 All of my Amateur Radio files have a new home! http://w5jgv-dot-com Visit my other web sites at: http://www.emachine-dot-com http://www.spectrotek-dot-com