prob the best and most informative(IMHO) web page is ; <A HREF="http://www.plicht.de/ekki/civ">icom ci-v info</A> from there, you can go to several other links...good luck.. Larry..N2LH BTW, i was going to build one, but decided on buying a tested mfg one..also check, eqf software web page..he has a link to JBI products which also make a kit, easy to build and inexpensive.