> Download http://www.aade.com/filter.htm The Design Inductors section has been useful, thanks I'm also looking into the Smith Chart, which I became aware of via an application note from http://www.ingecom.ch/index.php?page=3Dhome.php&language=3DEnglish http://education.tm.agilent.com/index.cgi?CONTENT_ID=3D5 And http://khup.com/keyword/smith-chart-advanced.html It's going to be a while until I figure out how all the variables (board material, antenna dimensions, orientation etc) affect performance Microchip have examples of basic PCB loop designs for the rfPIC line but I can see there is much much more to it for extending range, environmental interactions and so on Joe * * ********** Quality PIC programmers http://www.embedinc.com/products/index.htm --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .