I am using the HMC641 SP4T switch in a new design. A parameter of interest to me is Output to output isolation. This is not explicit in the data sheet (although may be implied by the common to output on/off ratio). The downloaded s5p file indicates 42 dB, which seems consistent with the data sheet RFC-RFX isolations. Is there a reason for the 20 dB difference, specifically a reason that may yield a measureable 60 dB result ?