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I purchased mine from AURSINC Vector Network Analyzer a year ago. Either I got lucky, or they are a legit outlet. I subsequently "discovered" these lists, and, based on material here, I then ordered a "legit" -H and -F (different sources). Excellent service from June et al. I disassembled both -H and compared...ISTR that I posted images here. I could not see a significant difference twixt the two, and there is no reason why I could not have bought a legit item from a dealer who was reselling legit items. Dunno. Happy w products.

It seems that the routine failure rate for just about everything these days is at least 5% right out of the box|door, and other failures (fittings, knobs, etc.) add a few more percent. It's funny in a way, because I used to look forward to the time when manufacturing had progressed to the point where nearly everything would be nearly flawless (which I know, from running my own company, is possible), but instead it seems that we have sort of regressed. It may be a side effect of "consumer-oriented" economics, rather than "environment- and quality of life-driven" economics. It seems that many buyers now are content to buy something cheaply made, and toss it, neglectful of the environmental impact. Growing up in Maine, and watching the slow, steady decline of the environment there made me very aware that my grandchildren would not see the same world that I was raised in.

LT: I was raised in northern Maine, moved south many years ago, and settled on the banks of the Piscataqua in Eliot. I did a research project on local history while I was there, and decided that I wanted to keep the name active, so I adopted the tag line. Now I live in NH, and can't see the Piscataqua from here :-), but still will always keep the line. Nice to meet you!

--
73 de Rich NE1EE
On the banks of the Piscataqua

Today I received a package from aliexpress that I ordered 22 January, 5 months ago. The package from itead.CC from November last year is missing - they sent another one but it got returned due to "security" reasons. I also wait for a youloop antenna ordered few weeks ago, also bounced back and resent. So yeah, getting registered china post to Europe is not easy now.

I purchased my vna-h from Amazon prime. About 70 usd. Fulfilled by seesii , which when googled seems to be a U.S. outlet for alibaba. It came in the nice gold lettered box with all the accessories and seems to work fine.

Also on the Piscataqua, kc1gcc.

Hi Dave,
First You must upgrade the hardware of Your device.
- remove R29, R30 and R31
- replace R13 by 0 Ohm
- replace R9 by 200 Ohm
- replace R24 by 91 Ohm
- replace R22, R23 by 49.9 Ohm
- replace R25 by 11 Ohm
In order to use the full frequency range (10 kHz to 1500 MHz) You must update Your Firmware.

Regards Bert

Reed, you are right. Aexample, i order small low cost items. They used to
come as free economy post. 30 to 50 days.
For a $2 item i feel bad to pay 15$ shipping

I got a NanoVNA from China a few weeks ago (purchased through Ali Express).
It took a long time to get here - about 1 1/2 months.

Zack W9SZ


On Mon, May 18, 2020 at 5:56 AM <namerati@...> wrote:

I am hearing that some people are not able to buy NanoVNA units from
China due to quarantine related issues... has anyone here encounterd
this?

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Hi Erik
Thanks for your swift reply.
I was aware of the wiki but haven't found reference to how you ascertain if a particular nanoVNA is (or isn't) upgradeable to higher frequency operation. (1.5GHz)
Also, I can't find a menu option to display what version of the software my nanoVNA is running. Unless the momentary 'splash' screen Gen11 is a clue?
Other contributors seem to have a CONFIG option in their menus.
Dave

I doubt that you'll have any issues getting your order but you may be required to pay a higher shipping charge. I regularly purchase from a company based in Hong Kong, On my latest order, under $20 U.S., I was requested to pay an additional $16 U.S. for a "Peak Season Surcharge (PSS) for Order ....To mitigate the exposure of epidemic...". Since it is not a critical situation that I need those items now, I can wait to get those items until the surcharge is lifted.

So, where and from whom did you hear this? I am in the importing business and have zero problems importing from anywhere - lead-times on OEM materials are shorter right now if anything. Please send me info on your source of info and perhaps I can get to the bottom of it.

To that point, my NanoVNA-F just arrived - took about 45 days - but earlier than promised by about a month. Watch buyer comments on any source you choose to use.

73,

-Bill, W9MXQ

Everything you always wanted to know and much more:
/g/nanovna-users/wiki

--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

Hi newbie here,
I have to admit I was tempted to buy a 'nanoVNA' off Ebay without knowing about this group or the plethora of different nanoVNA's, their extended ranges and 'clones' .
So the one I have displays Gen11.TAOBAO on the splash screen and doesn't seem to have some of the menu items mentioned by other contributors on this forum.
So I guess I have a 'basic' 50k-900MHz clone?
Question....
Is the nanoVNA upgradable to extend the range to 1.5GHz as it would have been good to cover the 23cms band, or did I mess up?
If it is upgradable, can someone link me to a 'dummies guide' how to do this please?
Thanks in anticipation
Dave

I wanted to add a larger capacity battery to my NanoVNA and protect it from getting damaged, so housed my device in an enclosure from Standard Supply Electronics obtained at .
It is nearly the perfect size, once you take a Dremel tool to it to remove some of the excess mounting slots and standoffs. Removed the front plate and mounted directly into the top of the case, in which I made a cutout for the display, using the NanoVNA frontplate as a template, and using the original screws (had to countersink the holes a bit to accommodate the screw heads to be flush to the surface; the enclosure was a bit thicker than the PCB frontplate). I cut up the original front plate to retain the labeling and attached the 2 label sections to the top of the enclosure. Cut slots in the sides to make holes for the USB-C, and Power and Control switches (countersink the area around the Power switch for better access). The case has a separate panel for the coax connectors to go through, it was a simple task to measure and drill these holes.

The 1000mAh battery mounted to the back of the original NanoVNA backplate using some double-stick tape. Drilled a couple holes in the original backplate to accommodate the mounting screws for the enclosure bottom (had to find some shorter screws from an old used enclosure. The screws that came with the enclosure could be used if you are skilled at cutting down screws ( I cut mine too short). The standoffs for the enclosure bottom mounting screws should be trimmed to be slightly above the surface of the NanoVNA backplate for a more secure fit of the enclosure bottom.

Overall, I was amazed at how well the it fit. Even the divide between the enclosure halves were perfectly positioned to avoid the extra work of having to mill holes for the connector and switches. If anyone would like pictures and more detailed instructions. Let me know and I will be happy to ablige.

Buying is not a problem. Getting it from china to the US is a problem. A lack of available freight aircraft. I noticed that DeepElec has now gone to DHL for shipping rather than use the slow route. Since DHL has their own fleet rather than depending on passenger or cargo aircraft it may help a bunch.

Sorry not relavent here.

I receved one that reached india in march and no issues. .
I cut the outer cover and disposed off.

I am safe, so far. Lol

Sarma vu3zmv

On Mon, 18 May 2020, 4:03 pm Ron Spencer via groups.io, <ron.spencer=
[email protected]> wrote:

I'd think if you did a cal for the typical hf range of freq (1.8Mhz to say
30Mhz) you'd likely be OK. The swr reading may be off a little but when
tuning an antenna you're looking for the swr dip. The nanovna may show a
different swr than actual. As long as you understand this going in I'd
think you would be OK. It will be precise but not accurate.

I am hearing that some people are not able to buy NanoVNA units from China due to quarantine related issues... has anyone here encounterd this?

I'd think if you did a cal for the typical hf range of freq (1.8Mhz to say 30Mhz) you'd likely be OK. The swr reading may be off a little but when tuning an antenna you're looking for the swr dip. The nanovna may show a different swr than actual. As long as you understand this going in I'd think you would be OK. It will be precise but not accurate.

Hi Mark and Bob,

The real reason is: The NanoVNA, due to it's very limited internal memory,
has only 101 calibration points - by far not enough for a GHz wide frequency span:
Each point is some 10 MHz apart from the next. (Depending on frequency, this may
mean anything between short and open if you consider the frequency difference for
Lambda/4 - between two measuring (or cal) points, thus loosing needed accuracy.)
For example, 3.5 and 7 MHz all are between 0.1 and 10.1 MHz - enough for several
lambda/4 differences. Do the cal fpr just the süpan needed, say 3.5 ... 3.8 MHz, and
you are fine with your NanoVNA.

Usual Antenna Analyzers (like my RigExpert AA-600) have so many more points. So
the same precaution there is not needed. Read the manual for more detail.

That is also the reason, why calibrating (and measuring) with the Antenna analyzers
takes much longer accordingly. It is not only due to faster/slower ICs etc.

With regard to ...

On Sunday, May 17, 2020, 10:02:38 PM PDT, Mark Schoonover <mark@...> wrote:

"You don't have to keep recalibrating. Once done, you save the parameters and recall it each time.
Just do the calibration over the entire frequency range and you are done calibrating.
Bob"

This is only true, if you use some external software (like NanoVNA Saver) that overcomes
the 101 points limitation. (You will see that accordingly this takes longer, too.) For a solo
NanoVNA, however, Bob's statement imho is not applicable.

73, Hans
DJ7BA

-----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von Mark Schoonover
Gesendet: Montag, 18. Mai 2020 07:02
An: [email protected]
Betreff: [nanovna-users] Nanovna vs Antenna Analyzer

Put my new nanovna-H4 to work this afternoon tuning up a new MFJ Cobweb.
Prett amazed at this $50USD device. Every time I changed bands I did a calibration. When I had an antenna analyzer I never had to do a cal. The analyzer I had did impedance as well as SWR. Why is this?

73! Mark KA6WKE

Website:




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Mark,

Bob is right, especially if you are doing measurements right at the NanoVNA connector. The interpolation of calibration points taken over a wide span works pretty well if connection lengths are short. Interpolation does not work so well when calibrations are done at the ends of relatively long cables. In those cases you will want to calibrate for the frequency span under use.

--John Gord

You don't have to keep recalibrating.? Once done, you save the parameters and recall it each time.
Just do the calibration over the entire frequency range and you are done calibrating.
Bob