Thanks to so many of you for your assistance. CoilCraft is going to supply the coils that we need. Hopefully, the prototype should be ready very soon now. Dave, W3ST Publisher of the Collins Journal Secretary to the Collins Radio Association www.collinsra.com Nets: 3805 Khz, Monday/Wednesdays 8 PM EDST 14250 Khz Saturday, 12 Noon EDST