Thanks for the quick responses -

I'll try the values you gave me out in the morning (I'm a teacher) at school. mister_e the URL you posted didn't work (it has an ellipsis ... in it). If possible I'd like to get that calculator since we're hoping to scale this up to use up to 8 different transmitter/receiver pair, though I anticipate having to do substantial filtering/additional encoding. But that's for another day...

Thanks again - Fiz

BTW mister_e I live just over the border in VT.