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Maybe I am interpreting this incorrectly. Your comparison shows with PortZ = 50 and PortZ = 430. The Smith Chart marker shows almost the same input impedance in both cases so it appears you did not

Rather than prioritizing new feature development for the NanoVNA, I would prefer to see some integrity/troubleshooting functions build in. Things like checking for internal shorts, component values

Yep...Just went through this myself. Mine was an MS version and dislord 1.2.40 defaults to SI. Bryan, n0luf

Second try on screenshots:

Roger, Here are screenshots of tests with a ceramic filter and a crystal filter at 10.7 MHz (different spans). Each is shown at 50 ohms and again at a higher Z that gives a better match. Also shown is

As a followup on this, I see the chip specific files from Huygen, but not Dislord . . . . fwiw . . . - Tim -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

Hi This is my point of view : Z--> option does not change the physically pot2 impedance , it remaine always at 50 Ohm +/- 1 ohm value, just firmware by computing way can display S11 or S21 as its at

If your nanovna-H is an MS version (rather than older SI version - see label on back for hardware revision number) - then you need to go into 'expert settings' and change the 'mode' to 'MS5351', then

After calibrating after upgrading to new firmware NanoVNA-H.v1.2.40.dfu from dsilord, the nano vna is showing what seems to be crazy flickering SWR values even after recalibrating and trying to find

At one time there were specific binaries which set that flag (but otherwise identical) Not sure if they still exist or not, since it's so easy to set. - Tim -- Sent from my Android device with K-9

Absolutely....thanks Tim. Somehow I missed your post. One thing Ill have to remember now is that a reset will revert it back to SI...even if I save the config. Fred, Yes, the sma connectors are weak

I have been using the STM32 Cube Programmer (latest is now 2.19). Thanks so much for the docs and driver so I can now switch back and forth. I'm so used to the STM32 way but it's nice to be able to

Thanks for the shout out, and glad that I could help! - Tim -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

Interesting... What was the design impedance of the filter? I am surprised at your results because the loading greatly affects the crystal filter characteristics. The usual way is to use a series

Roger, Most filters are passive and linear. A crystal (or ceramic) filter response is correctly transformed by the renormalization; I have used this feature several times. I agree that an active

Thanks -- I don't get the emails from this group. I just log into the Web site for groups.io. It may be the way it formats on the Web. Roger

Hi Stan, Shortsightedness on my part and I hadn't looked well enough and found your instructions which worked perfectly, thank you ever so much, Pete

Roger, Both the link DiSlord provided and your original link work fine for me. It may be your email provider chopping up the link. Tony [email protected]> wrote:

Bryan - The first one to suggest this was Tim Dawson so he gets the credit not me... Roger

Just a crazy thought from someone with very little VNA experience ..... SMA connectors are known to have a quite limited number of insertion cycles. Is it possible you have a connector that is no