Zack, You can use a duplexer/diplexer on the 70cm side. http://www.amsat.org/amsat-new/articles/Mode-J/ Dave - KB1PVH Sent from my Verizon Wireless DROID X On Jan 14, 2011 9:53 AM, "Zachary Beougher" <zack.kd8ksn at hotmail.com> wrote: