40 GHz downconverter at 47GHz

Many years ago I bought a 40GHz downconverter assembly.  The input was WR28, there was an LO input and IF output SMA.  The IF was in the 1GHz range and the LO input was listed at 8 to 10GHz.
I never used the downconverter as I had convinced myself it wouldnt work at 47 - after all, thats what the surplus id tag read.
I finally decided to open the downconverter and see what it looked like on the insides.  There was a PC board assembly for the detector post amp but what was interesting was the LO and RF input:  There was a hybrid ring and what looked like chip diodes.  The LO transmission line had a tiny chip that must have been the multiplier.  What was interesting was that there were NO filtering on either the RF or LO transmission lines.  So, what would stop me from feeding in 11.8GHz?  And, why not see if the mixer post amp was broadbanded and worked at 432MHz?
I fed the multiplier with 11.8GHz from my Elcom oscillator and hooked up the IF to my FT817 tuned to 432MHz.  I turned on my 47GHz weak signal source brick and quickly found the test signal - I now need to try higher LO drives (I was using 13dBm) and try the gain pot on the post amp board.
So, the lesson is: if you dont try it, you never know if it works.....

Picture 1:  RF input on the left, LO input on the right.  IF out the top.

External view of the 40GHz down converter