Marki Microwave Inc.'s ultra-high linearity, ridiculously broadband T3 mixers are now offered with complete frequency overlap on all three ports up to 18 GHz.  The T3H-18 and T3H-20 feature RF/LO coverage of .01-18/20 GHz, with matching IF coverage of .01-18 GHz.  These triple balanced mixers allow virtually any frequency plan from VHF-Ku in a single unit!  With the superior spurious (and two tone) suppression of the T3 mixer series, and low conversion loss, these arbitrary frequency conversions can be completed cleanly and with excellent dynamic range.