On Thu, 5 Sep 2002, Jim wrote: >A figure of -160dBc is not so unreasonable ... At that level (0.25uV) even a thermocouple can compete as a mixer imho. I assume that dBc is specced against the weaker carrier to make things harder, no ? Anyway my testing was at low frequency (<1MHz) even so I got some contact samples to produce parametric oscillation with the test cables alone. Peter -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics