It's always a treat to watch your teardown videos, especially the details you cover, like the part number and functionality. Can't wait for your next project!

My first visit here & thoroughly enjoyed it! Be back on a regular basis from now on. Keep up the good work!👍🏽

You're a great teacher. I'll look for your videos from now and work on your advice. Thanks

Hi Kerry Thanks for the excellent video. There are many different nanoVNA models with different features and firmware. The state of affairs with the nanoVNA is in quite a state of flux. For someone that is considering purchasing a nanoVNA the task of determing what models have what features and what features are needed by the user is a daunting task. Your video goes a long ways to inform the viewer of the nanoVNA F V2 capabilities. The theory of operation break down is much appreciated. Thanks for taking the time to produce this video.

Great teardown as always.

A great teardown, Have a Happy new year Kerry...cheers.

I appreciate the introductory view for those of us that don't interact with these everyday. Looks like a useful item to have in the toolbox (especially in an age of cheap antennae of varying quality). 👍️

Thank you! I’m a novice when it comes to VNA test equipment and purchased one for use in public safety 2-way radio system installation and maintenance. Truthfully, the only “advanced” pieces of equipment I own is a portable Agilent Spectrum Analyzer w/TG and a Rigol budget friendly SA with TG. I use them for duplexer and filter tuning. I want to expand my knowledge and this seems like the ideal tool! The Nano VNA I bought is the smaller display unit with plastic housing. It was approx $90 from Amazon. I actually found your video by searching for instructions on the use of the Nano VNA. Fortunately I found the video during the 30 day return window. I will be ordering the one you are showing w/metal housing and larger display. Thanks for the video AND the link!

Thank you for sharing.

Excellent video thank you.

Thanks for the excellent video

The AD8342 mixer is the Q01 marked QFN16 chip right near port1 (Q01 marking matches the datasheet and photos on the internet)

It looks like PCB traces connect the gunked-up connector P3 to the XP, YP, XN, YN inputs of the XPT2046 Touch Screen Controller U21. Maybe that connector allows the use of different resistive touch screen overlays that have a flat flex cable connection coming off of the bottom instead of off to the side as is the case on the unit you have.

if i was using it a lot i'd make sure that when you screw in the cals they dont rotate the centre pin someone (another reviwer) pointed this out so the centre pin wears out the connector over time, i'd add some v short cable and cal that should be ok as you can easily replace cables not the PCB conns

Nice video 👍

Is it possible to measure structural resonance using nanovna and near field probes? During compliance testing, many products fail the Radiated Emission and Radiated Susceptibility test due to structural resonance. Can you please make a video on this?

Hi, I’m wondering if you could help me to clarify how do you calculate the electrical delay for this connector, I.o: how did you determined that connector caused a delay of 125ps, which formula did you used for this?. Thanks.

The metal case is quite nice; the plastic case on my tinySA was the first thing I changed.

"Finger tight would be good". Ideally a fixed torque setting should be used, or at least 5gat is what we used to do at L3.

My compliment

Perhaps there is a confusion here (22:45). As far as I understand, the output power of NanoVNA-F V2's signal generator is -10dBm (from 140 MHz to 1 GHz), not +0dBm. That is supported by Sysjoint, the readings on my SA, and the readings on your SA as well (try changing your SA's built-in attenuation to a value other than 10dB and see that your reading remains unaffected). When the NanoVNA's "-9dB" setting is engaged, the VNA nominally outputs -19dBm at this frequency.

Is the LCD screen removable, so that I may reflux the chips without damaging it? I don't think I can reflux the chips without damaging the LCD screen.

Do any versions of the NANO VNA have a DTF function?, I would find this very helpful if they would write some firmware for DTF, if possible !!

What is the resolution that the nanoVNA can reach in the scans? 1Hz? 10Hz?

My odd comment: That 12 MHz crystal Y1 is getting more and more obsolete if it is in that CX5032 7x5 mm case. The 3.2x2.5 mm case with 4 pads is now much more popular and cheaper.

Interesting that they don’t clean off the paint/anodisation on the cover so the electrical contact to the case/shield is dubious. The VNA currently has no Pmax or P1dB spec, It means you can get into problems with testing >20dB amplifiers since the mixer could get overloaded or blown. External pads needed. This is an awesome bit of kit. I tested the frequency accuracy of mine against my Picoscope 3206. Using the VNA 200MHz signal source you can just alias on the scope sampling rate and see (and measure) the difference frequency (beat). Provided the scope doesn’t have anti-alias filters (or they are turned off) this measurement is straightforward. *EDIT:* I contacted their tech support and they claim 25dB is the maximum input, which I assume means 25dB relative to the -9dBm output level. But note that an AD8342 has a P1dB of 8.3 dBm typical. I think it is “brave” trying to measure 8.3dBm + 9dBm = 17.3 dB gain amplifier directly. I would say that if S21 reads above 15 dB you should be attenuating on either port, and you need to attenuate before connecting up a 30dB gain amplifier or you risk frying the mixer.

This is a very insightful video! Thanks! :) Does anybody know why in the design of NanoVNA-f V2, a 24 MHz crystal is used for the Si5351A chip? According to the datasheet, Si5351A shall be driven by either 25 or 27 MHz crystal.

Does it meet its 3 GHz spec?

Hi Kerry updated my SYSJOINT NanoVNA-F V2 with the wrong firmware would like to reset to factory settings it went dead afther the green bar went to the end and stuck there and went dark can You help Thank You

Love your videos. and first :)

Cpu IC type Brpa bos

In case you missed my reply below, the testing scenario is simple -- Do the normal S-O-L-T (short, open, load, thru) calibration on the full 1MHz to 3GHz frequency range -- LEAVE THE THRU CABLE ATTACHED -- and then bring up the following traces -- S21 Log Mag, S11 Log Mag, and VSWR (with scale 0.2). On my unit the VSWR looking into PORT 2 starts out at an almost perfect 50 ohm 1:1, but then linearly increases up to VSWR 2.4 to 1 at 3 GHz. Please check this out and respond. Several web sites are blowing out these SYSJOINT F V-2 VNAs so if they all have faulty PORT 2 VSWR then I think it would be better to get this information out there so people know what they are buying --- or NOT buying quality wise.

Can somebody confirm the value of resistors R36 and R37?

Is the dynamic range limited by crosstalk or by the synthesiser performance?

Would it be possible to use this device to create digital eye diagrams?

Thanks for the introduction. Isn't it quite meaningless to calibrate the NanoVNA from 50 kHz all the way to 3 GHz with just 101 measure points? You should narrow your bandwidth to what you really want to use your antenna for - otherwise the results are pretty useless. You will probably miss a lot of information that way and just get a rough overwiew.

Nice! But same exact one is $45 less on Amazon with next day shipping.

​ @Kerry Wong 1.4 : 1 isn't meeting the 1.1 : 1 spec but it's a lot better than I am seeing - Is that at 3GHz? - because mine looks much better up to 2GHz. If you are seeing 1.4 : 1 VSWR at 3GHz, that may be all the better that this design can do since I have noticed that there are several knock-off versions of these 50kHz to 3GHz NanoVNAs, including the AURSINC NanoVNA SAA-2N V2.2 (which has N connectors). On that unit the upper end return loss at 3GHz is more honestly spec'ed at 13dB min, which is close to what you are seeing, so I suspect that would be what SYSJOINT would also specify if their specifications were accurate and honest. EDIT: I appreciate you doing the test, and the info about the LiteVNA -- I may get one of the LiteVNA units just to extend my measurement range up past 3 GHz to 6GHz, so it's good to know that the PORT2 VSWR isn't super great on that unit either. Fortunately, the 10dB attenuator I have is good for about 1.1 VSWR well up past 6GHz, so I can use it to improve the VSWR looking into PORT 2 for S21 measurements on both the VNA-F V2 and LiteVNA -- and if I need more dynamic range, I will just add an ERA-1 10dB MMIC Amplifier to make up the lost 10dB something like this>> PORT1 OUT -> DUT -> 10dB Atten -> 10dB ERA-1 Amp -> PORT2 IN. Ripple across the band is low on the ERA Amps, so the accuracy of such a lash-up should be excellent if it is calibrated with the ERA Amp in the chain. You could even go with something like an ERA-2 amp, which has about 15dB gain at 3GHz, falling to about 11dB at 6GHz, which would actually slightly IMPROVE the VNA's dynamic range, even after taking into account the increase in noise figure due to the 10dB loss in the attenuator.

You can see it in 29:15

23:22 You're asking the VNA to generate 500MHz, and it actually spits out 495? I don't see how I could trust such a device to do things like tune a duplexer.

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Good Job. From 2 Texas Hams..the idea picked up by a Japanese Ham, who created the original kit and built (in collaboration with others) software implementation..and a nice HW implementation that was made open source in an attempt to avoid bad clones from China. Now we are looking at "Improved" Chinese Products with Proprietary Hardware Implementations in a blood bath free for all- for market dominance- which is what China does best. Throw a team of engineers at it and attempt to "own the clone". Meanwhile 14% of your investment in it goes to the CCP Domestic Security apparatus running a GENOCIDE, operating over 350 Concentration Camps and exterminating every trace of religion and democracy in China, god be damned.

On the official SYSJOINT Webpage, the specified port input VSWR is 1.1 to 1 corresponding to a Port 2 input return loss of about 27.4 dB which is only marginally acceptable but not too bad. Unfortunately, my unit shows AN ACTUAL PORT TWO RETURN LOSS OF LESS THAN 9.5 dB at 3GHz with a corresponding VSWR peaking at OVER 2.4 : 1 -- WHICH IS TOTALLY UNACCEPTABLE -- and I see after some searching around on the web, that others are seeing the same thing. The input VSWR slopes up gradually, only becoming really bad at the higher end of the instrument's range, and is less of an issue below 1GHz, and it can be compensated for by adding a low VSWR 10dB microwave attenuator at the input to PORT 2. Of course, this work-around comes at the expense of 10dB of S21 measurement dynamic range, and the Narda DC-18GHz 10dB attenuator I am using cost more than the Nano VNA-F V2, so you'll have to shop around a bit to find a surplus 6dB-10dB SMA-SMA microwave attenuator with good VSWR at a reasonable price.