Receive Mixer experiments for 24GHz

My last set of experiments for receive mixers involved two different mixer types for 24GHz.  The first was a Marki Microwave harmonic mixer made for the 22-33GHz (?) range.  Again, digging through my pile of stuff I had bought three of these mixers at Microwave Update many years ago.

A microwave part is just a fancy paperweight unless its used in something.

This mixer has sma connectors for the LO and IF - from what I could find on the net, its IF was in the 1GHz range.  The waveguide input appears to be WR34 (?) or some non standard flange - its feed is smaller than WR42, the hole spacing is slightly smaller than WR42 waveguide.  I found I could attach a section of WR42 with one screw only - obviously the fix is to drill out the holes on the WR42 flange which im not crazy about defacing my small stash of waveguide but its needed to get a good mechanical mount with all four flange holes.

Anyway, hooking this up to my Elcom 11.8GHz oscillator and 432 for an IF detected full scale the 24ghz test source in the shop.  Im planning for this to be a spectrum analzyer extension mixer - it could also work for a bilateral mixer but I need to test it for transmit.

While I had my 24G test setup running, I tried a Celeretek receive mixer.  LO was around 14dBm, IF 432 MHz yielded full scale readouts on the FT817 with the test source.  This mixer will definitely work for my backup 24G radio.