Hi guys, I've just spent a lot of time this morning on the FCC website simply looking for the frequency allocation table for the ISM bands (really just the 915MHz) and the rules appertaining to the usage of the band. "A needle in a haystack" only barely describes my experience! Now I did manage to track down the Part15 document which gives some information, but I'm nowhere near having it all. I vaguely remember someone on the list referring to transmission time duty cycle restrictions in these bands, so I know there is a lot more to be found. Can anyone point me to the correct documents for what I need. All comments are welcome (even flames about not searching properly !). Still in search mode Slan John -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads