Pete,
I've been doing that to feed my SDR-IQ and it does not seem to be a sensitivity problem.
*NOTE* the RX Out/In loop is *after* the transmit lowpass filters and as such they will impact the ability of your QSR-1 to receive on bands above the one in use on the main receiver.
73,
... Joe, W4TV
W4TV在提醒K3的RX Out/In 环回处于TX LPF之后,会对SDR的接收性能有影响,不能完全发挥SDR的优势。