Inrad's #762 is now listed on Inrad's Ten-Tec page: http://www.qth.com/inrad/tentec_menu.htm (Note that price should be $80 and not $115) #762 response curve plotted here: http://www.qth.com/inrad/graphs/762.gif Tutorial on roofing filters here: http://www.qth.com/inrad/roofing-filters.pdf 73, Bill W4ZV