Joris PE1KTH got back to me about the KTH bandwidth. Here's his reply: "Hello Michelle W5NYV The input filter is 10 Mhz wide and the I&Q demodulator chip has a baseband width of max 130 Mhz. If the I&Q baseband IF output must be 0-6 MHz, then the PCB design is not designed for this high output frequency. It must be redesigned. 73' Joris PE1KTH"