On Wed, 23 Feb 2005 04:28:27 -0000, "Leon Heller"
wrote:

Diode mixers make a real mess of the input LO signal, if you look at what
happens to it with a 'scope. They have to be fed from a 50 ohm resistive
source, but they are not really resistive themselves.

yes they do. I've also used square wave drive and found that you have
to be sure your really driving them with 7-10DBM. A 74F74 really
can't do that though it looks that way. I found I had to use a
parallel group of 74HCT244 buffers (minimum of three) to get good
drive.

Allison