Have you tested the parts to make sure you have the correct values?
Marco
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On Thu, Jun 4, 2020, 2:24 PM GM7 <geeemmseven@...> wrote:
Thanks Dave,
Your simulation is the response I expected. Unfortunately i's not the
response I'm measuring. I re-calibrated and then used the Smith Chart as a
sanity check. I got the expected results for open, short and 50 ohm load.
When I built the fixture I connected the ground permanently so that the
ground is connected between CH0 and CH1 even when the LPF is not in place.
I've re-tested without this link and got the same results. In general
terms I'm not sure if this link is a good idea or if I should remove the
link.
