Eric.Wilson

4-9-13 -- Here are some useful links to mixers that I found (The second link may be more useful):

http://www.mhprofessional.com/downloads/products/0071544526/SayreCh07.pdf

http://www.qsl.net/va3iul/RF%20Mixers/RF_Mixers.pdf

4-15-13 -- If you are seeing the LO signal coming through the output of the mixer, it could be that the LO signal is just being picked up on the output due to poor shielding around the mixer. I could disconnect the LO signal from the mixer and it still showed up on the output, indicating the mixer wasn't at fault.