What filters are used in determining TX bandwidth?
Only the filters on the MAIN RX board are used during transmit. Filters on the subreceiver have no effect during transmit. Will the K3/10 and KAT3 combination be able to work with an external amp inline or are the connections available only internally? I would like to find out if the K3/10+KAT3 can support a two-port box in the middle. The KAT3 is internal and very tightly coupled to the 10-W or 100-W stage. While you could in theory interpose an external amplifier between the 10-W stage and the KAT3, we haven’t tried it, and it would require special firmware support. I really wouldn’t recommend this. The KPA3 is a high-performance 160-6m 100-W module with excellent heat sinking, monitoring circuitry, two fans, and its own circuit breaker. This results in very smooth high-power operation, while an ad-hoc solution external to the radio might not. We also don’t plan to support the KAT100, for [very good] reasons I outlined in my earlier posting on the auxbus.
