Is there a significant change in the boards impedance characteristic from 1 oz copper to 2 oz copper to effect RF circuits from 215 to 230 MHz. When I plug 1 oz to 2 oz copper in my calculations I only get about 1/2 ohm of impedance difference. Ronny Luman C.I.D. SERCEL INC. (918) 621-5725 [log in to unmask]