I have successfully used Wensching RF Transmitters/Receivers (Modulation: AM, Frequency: 300-433MHz, Supply: 1.5V-15V, RF Output Power: 8mW, Sensitivity: 3uVmms) They are very cheap ($9.95 for each module), and can be bought from RadioShack; catalog numbers 900-6895 and 900-6896 Please note that RadioShack does not carry the modules in their stores - you have to have them ship it to you. I have found these modules to work quite well with regular serial data (RS232). I am currently updating my web-page regarding these chips: I found that they had a few quirks to them I wanted to document. Check there in a few days... (http://www.cyclotomic.com/~martin/projects.html) The output power is not very strong, so range is limited. I don't see any reason why you shouldn't be able to amplify their output, however (well, except for the FCC *grin*) Martin ------------------------------------------- Martin Wehner e-mail: web: http://www.cyclotomic.com/~martin ------------------------------------------- -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu