> While going through the Config menu's I came across > RF nor KNB3 and RF nor KBPF3 entries. It means this is the main (RF board) KNB3 or KBPF3. If you tap the SUB button, and have sub Rx installed, you'll see RF change to Sub to indicate the status of the option in the KRX3. 73, Lyle KK7P