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Thanks Jim. Still learning this neat tool. So just the phase trace is all thats needed on s21 to measure isolation? Are results frequency dependent? Bryan, n0luf

Don't do "double calibration", it just forces the device to do interpolation between points. The note in documentation remains there for misbehaving devices that would give out or range values when

Thanks for all of the help. The plots are very enlightening. it seems like this explains this. In response to the on device calibration, is disabling it simply unchecking the apply button? And also

If you do not have the version 0.8 as *.bin (or *.dfu) file I would propose to save it from device before you flash the new version. Dunno how to do it on windows, on linux I use "dfu-util -d

Saa2n has a custom display pcb... So you must buy a "normal" 4 inch display and desolder the flatband cable (if display screen is broken)... Or you must ask the seller to send you a display (if it is

0.8 is an extremely old version. This should work on your device: https://github.com/DiSlord/NanoVNA-D/releases/download/v1.2.20/NanoVNA.H.v1.2.20.dfu In case you were worried about "bricking" your

I have an SAA 2 4 in nano VNA and I need a new screen any place available to buy a 4-in screen De K8HTB Joe

Measuring switch isolation. Let's say your switch has a common, and 4 switched outputs A,B,C,D Hook the VNA up to Ch0 to A and Ch1 to B, put a load on Common, set the switch to A, and measure the S21.

I've done similar with antenna analyzers in the past and currently with a VNA. Switches I've used provided sufficient isolation...so far.

Hi Jim, How do you do that? [ "But it's good to check (and hey, you could use the NanoVNA to measure it)." ] Bryan, n0luf

Roger, Thanks for the link. It doesn't look like my original Nanovna needs updating. I assume that the updates for the later versions would not be suitable. Don m5aky

Well guys n gals I found my issue at last! The coax i was useing is (ok) if I'm using a tuner but horrible if running straight through. I was getting super high swr. Today I remembered I had a string

On 6/14/23 5:08 PM, Jim Lux wrote: > On 6/14/23 2:17 PM, Jim Lux wrote: >> On 6/14/23 12:20 PM, DiSlord wrote: >>> I hope you disable internal NanoVNA calibration and use only NanoVNA Saver

just to illustrate how a small error can show up in group delay, I simulated what you'd get with a 2 meter cable

This is a good point.. In addition, you might use a sim program to simulate an ideal line with a small discontinuity, and see what kind of wiggles you get. Think of this - you're doing an S21

I hope you disable internal NanoVNA calibration and use only NanoVNA Saver calibration Linear Interpolation (used in internal calibration if points count or frequency range not equal) can give errors

Two easy explanations (assuming a perfect cable) are: 1) The 2 port cal doesn't necessarily take into account that the Ch1 (port 2) isn't perfect. 2) Your S/O/L loads for cal aren't perfect (or more

Can anyone explain these wiggles. I am just measuring the group delay of a 2m cable with NanoVNA Saver using a 1MHz to 701MHz 1212pts 3average sweep. I used both a NanoVNA H4 and NanoVNA V2, but the

Since you've been doing this a while, you don't have an issue, but in general, one would want to make sure the isolation between switch ports is high enough to make sure that when you run 100w to the

I have my antenna going thru my MFJ tuner then to the common terminal of a 6 position coax switch. I leave the VNA connected to position 6. Coax 1,2,3&4 each go to different radios I have. I can