RF Combiner – Model D9579 – 4-Way In-Phase Connectorized Combiner. RF Combiner – Model D9579 is designed for military and commercial applications and operates with less than 0.35 dB of Insertion Loss. The D9579 operates with better than 20 dB Isolation. Choose your specific connector configurations from a list of options. Additional connector configurations for our RF Combiners and RF Dividers, Non-Coherent Combiners and N-Way Combiners are available upon request.