> so the detailed parameters are usually > not an issue unless you are striving > for maximum possible range. Fine for 36/38/40 kHz, but there are also 30 and 60 kHz receivers. And when you are designing your own protocol you must realy read the pulse/pause requirements of your particular receiver. I have not yet seen unmarked receivers, but the inscription on the big ones is often very difficult to read. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: www.voti.nl/hvu -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist