"Leon Heller" wrote in message
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wrote in message
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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.

I suppose what the OP needs is the square wave equivalent of a +7 dBm sine
wave. I'm not sure what that is.

To answer my own post: I think it should be 1V p-p for the equivalent square
wave, which is the same power as a 0.5V rms sine wave into 50 ohms (+7 dBm).

Leon