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Thanks for the link; that is a useful resource. - Ed

On Sat, Jan 25, 2020 at 09:19 AM, Jos Stevens wrote: " I'm testing my new NanoVna-H4 iusing NanoVNA-Saver and have a problem doing the 2 port calibration"

Here are polar plots for CH1 connected to CH0 corrected vs uncorrected

Here are screen captures from my "worse clone" for uncorrected vs corrected

I'm testing my new NanoVna-H4 iusing NanoVNA-Saver and have? a problem doing the 2 port calibration . When I have done the last item of the calibration procedure (through) I see a nice sinewave-like

I just reconfirmed it working using a different (Safari) browser not logged into YouTube

No, but I do not have semi rigid coax.. First measurement using 35cm RG316 shows loss from 250-400MHz. Second measurement using longer LMR-400 shows loss from 41.67-66.67MHz, approximately matching

Interesting, the link goes to a channel that says there are no videos! Roy WA0YMH

Hello Norbert, I think it has to do with calibration. After calibration direct at the nanoVNA CH0 SMA female plug, a 1 m coax cable connected to the reference plane with open at its other end, should

There exist a very good kindle e.book about the Nano Vna :

On Sat, Jan 25, 2020 at 04:54 AM, <sidebores@...> wrote: Can someone tell me please do you have to calibrate everytime you change the start and stop frequency limits. Or is the cal good if its

linked in /g/nanovna-users/wiki/Application-Notes#Collected-wisdom

A source of useful VNA application information at - https://www.nonstopsystems.com/radio/frank_radio_coax-sw.htm

Hello Kev, Interpolation is used, however the routine is not so robust that it would precisely apply without some error introduced. Hence, if I recall you will see a cal* symbol display. If you desire

You can limit yourself to the previous calibration. But this is not entirely correct if you want to take measurements on a narrower part of the range. It is advisable to have a calibration for this

Hello there, Can someone tell me please do you have to calibrate everytime you change the start and stop frequency limits. Or is the cal good if its within the original cal eg 50Mhz to 400Mhz to 70Mhz

On Sat, Jan 25, 2020 at 02:06 AM, Gyula Molnar wrote: " is this problem even without USB connection? Does it return a negative number even when there is no connection between your computer and nano? "

Hi Gabriel It still looks pretty fine. A S11 dB with e.g. 0.1dB/division will tell you a lot compared to a simulated line in SmithChart. A shorted line does not have the S11 sloping trace the first

One BNC-binding post adapter should be flipped to allow thru calibration without crossed wires

Link added in /g/nanovna-users/wiki/User-Guides ( although since not specific to nanoVNA, arguably should be in /g/nanovna-users/wiki/External-links )