开云体育

Hi Stuart,
That unit comes with a battery, per the written description and you can just make out the battery looking at a side view of the unit.
In any case, the black unit also has shields over the 3 mixers.
As for price, AliExpress guarantees what you're buying or they refund.

73, Larry

Here is the nanoVNA capturing a 40 meter table top loop. The pre selector is in bypass mode.
At these frequencies the response is essentially spot on with the big box. This much fun should be illegal.

Alan

Thanks for the link Larry. I am going to order one. Not 100% convinced that the battery is included, but that isn't a big deal. I have several scalar network analyzers up to 26.5 GHz but no VNA. Would like to experiment with one without large cash outlay.
Stuart K6YAZ

I got mine from lifangduo1006_0 <>. It was $75. After looking at ll the others for less, I guess I didn't get a bad deal. It has a battery is the white Gecko. I asked about any info, and they sent me something in Chinese
I have to look at the FW, but I only have 2 traces and saw somewhere there is a load that supports 4 traces.
I wish there were markers on the NanoVNASharp. Ver. 1.02 seems to work OK, but I have to pull the USB cable then turn it on then plug the USB back , and I can connect
Frank

Sometimes the best price is not a bargain.

Burt, K6QOK

At 12:16 PM 7/3/2019, you wrote:

I just ordered from this Aliexpress vendor::
He had the cheapest black unit and the photos show batteries and cables & cal adapters.
The down side is his ad says he ships in 7 days as he's waiting for stock.
So, for now, I'm playing with my Gecko.

73, Larry

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
biwa@...
K6OQK



--
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, CA? U.S.A.
K6OQK

I actually have a few Agilent cal standards my self. Did microwave product
testing for 3 years at a previous job. Now as a ham I miss having access to
my lovely Agilent 5230A ;)

On Wed, Jul 3, 2019 at 3:06 PM Stuart Landau via Groups.Io <stuartl73=
aol.com@groups.io> wrote:

I looked at Aliexpress but saw no one offering a battery. All of the
descriptions seemed to be actually the same. Since there seem to be
variations among those offered, it is a great help to know which have the
lasted updates, before buying. I have a bunch of excellent 18 GHz SMA male
50 ohm terminations. Each has been tested on a network analyzer. The return
loss at 900 MHz will be 40 dB or greater. I can offer a very reasonable
price.
k6yaz@...
Stuart K6YAZLos Angeles, California USA





-----Original Message-----
From: Larry Rothman <ac293@...>
To: nanovna-users <nanovna-users@groups.io>
Sent: Wed, Jul 3, 2019 7:17 am
Subject: Re: [nanovna-users] Nano Vna Pre-Order?

Banggood, Gearbest, Tomtop and a few others are like Aliexpress and eBay
(buy it now mode) - they are an umbrella of many vendors that take a % of
sales.
You shouldn't have a problem - I've bought through BG many times.
Unfortunately though, sometimes it can take a couple of months of you
chose free shipping.
Other times, I've received my item in 2 weeks (China to Canada) with paid
shipping.
BG offers shipping insurance - buy it for a little extra and pay with
PayPal so you have 2 avenues you can pursue if you need to claim a refund.
BG has warehouses in China, Europe and the US.

I had originally ordered the Gecko white unit without a battery but I just
ordered a black unit with battery and cables for $10 less on Aliexpress.
Hopefully, it will take 3 weeks like the 1st one.

Cheers,
Larry

I just ordered from this Aliexpress vendor::
He had the cheapest black unit and the photos show batteries and cables & cal adapters.
The down side is his ad says he ships in 7 days as he's waiting for stock.
So, for now, I'm playing with my Gecko.

73, Larry

I looked at?Aliexpress but saw no one offering a battery. All of the descriptions seemed to be actually the same. Since there seem to be variations among those offered, it is a great help to know which have the lasted updates, before buying.?I have a bunch of excellent 18 GHz SMA male 50 ohm terminations. Each has been tested on a network analyzer. The return loss at 900 MHz will be 40 dB or greater. I can offer a very reasonable price.
k6yaz@...
Stuart K6YAZLos Angeles, California USA

The dates are slightly different when firmware is installed. I used the firmware dated June 11 (20190611). But when I checked the firmware info inside the NanoVNA it said June 12, so that is what I quoted to you. So we probably have used the same software. Sorry for the confusion.

Most of the NanoVNAs being sold have the older F/W. So there is the question, that many users face, of upgrading the F/W .

Yes, I was very lucky with the Gecko auction. It ended late at night with many of the other bidders probably asleep!

Spot on Dave, I agree. Addressing this process would provide a nice value added capability.

Alan

________________________________
From: nanovna-users@groups.io <nanovna-users@groups.io> on behalf of Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...>
Sent: Wednesday, July 3, 2019 2:57 PM
To: nanovna-users
Subject: Re: [nanovna-users] Calibration coefficients - can one change them?

Okay, I get what you are saying now.

That problem should I guess be resolvable in the firmware, although it will
take a very careful look at the firmware to see how to resolve it. But the
problem should be resolvable.

Dave

On Wed, 3 Jul 2019 at 14:31, alan victor <avictor73@...> wrote:

I guess to make the point clear, 3.5 mm SMA standards DO NOT APPEAR as
IDEAL SHORT, OPEN on the chart. The fact that they DO on the nanoVNA SAYS
IN ITSELF... There is an issue!

--
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892

Tel 01621-680100 / +44 1621-680100

I just ordered the black unit with cables and battery and you're right, the Gecko unit is slightly inferior.
Have you found the source code repository for the June 12 versions of F/W? All I have are DFU files dated June 11.
You were lucky with the auction - several vendors have reserve bids that are almost the same as the normal selling price.

Regards,
Larry

Okay, I get what you are saying now.

That problem should I guess be resolvable in the firmware, although it will
take a very careful look at the firmware to see how to resolve it. But the
problem should be resolvable.

Dave

--
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892

Tel 01621-680100 / +44 1621-680100

Hi Larry,

You did a good job with the command list. No problems found!

Yes, there are several versions of the NanoVNA firmware. I have found that the June 12 version is the best. It fixes the problem of communication/interpolation while recalling Cal settings. Not sure how you would find commands from the binaries.

My application is running now on PC Win XP laptop. So far, I am impressed with the little NanoVNA. I have two versions, the black version (gen111.taobao.com) and the white clone (Gecko) model. Picked up the Gecko at auction for US$28. I wanted to compare the two models.

They are very similar but Taobao model seems a bit better. It has stronger type C USB connector vs micro on Gecko. Boot pads on PCB are much bigger on Taobao model. On/off switch is nicer on Taobao, with nicer feel that Gecko. Battery is larger on Taobao and the PCB looks better too, more finished. But both units seem to work. Calibration kit accessories are better on Taobao and you get a set of sma cables, thru connector and USB cable too, things not included with Gecko.

But if you have big hands/fingers you might find the units too tiny to use comfortably.

I have transferred June 12 firmware to Taobao VNA and it works well. Will do same with Gecko soon.

In next few days (or so) will be using my app to compare the impedance measuring accuracy of NanoVNA to my trusty AIM4160 impedance analyzer, which goes to 180 MHz.. As I said, this tiny little unit is amazing so far. It has already proved its worth in measuring crystals and plotting transfer functions of filters.

When measuring things like SWR for antennas in the field the handheld NanoVNA works well. Several of my antennas were found to be spot on compared to my other analyzers. But in my home lab, I like to use PC app (like NanoVNA Sharp or my own app) with the NanoVNA to measure components like coils, crystals, filters and so on.

Regards,
George

Oh I use banggood all the time. I am more of "when is it coming" does
anyone know. I ordered it on may 26th.... But its a waiting game i guess.
Just being impatient :P
Definitely need to get a batter for it thought.

Banggood, Gearbest, Tomtop and a few others are like Aliexpress and eBay (buy it now mode) - they are an umbrella of many vendors that take a % of sales.
You shouldn't have a problem - I've bought through BG many times.
Unfortunately though, sometimes it can take a couple of months of you chose free shipping.
Other times, I've received my item in 2 weeks (China to Canada) with paid shipping.
BG offers shipping insurance - buy it for a little extra and pay with PayPal so you have 2 avenues you can pursue if you need to claim a refund.
BG has warehouses in China, Europe and the US.

I had originally ordered the Gecko white unit without a battery but I just ordered a black unit with battery and cables for $10 less on Aliexpress.
Hopefully, it will take 3 weeks like the 1st one.

Cheers,
Larry

I pre-ordered my Nano-VNA from Is this a legit seller? If so does anyone have an idea on how long we will be waiting for the next batch of shipments?

I guess to make the point clear, 3.5 mm SMA standards DO NOT APPEAR as IDEAL SHORT, OPEN on the chart. The fact that they DO on the nanoVNA SAYS IN ITSELF... There is an issue!

I am quite familiar with the error. Please read my post carefully. I point this measurement observation out as this is a STRONG HINT that something is NOT correct!

In any case, I measured their "standards" independent and I found the 50 ohm load at 58.5 + j 11.5 ohm at 900 MHz.

The short and open are 412 pH and 190 fF respective.

I suspect no polynomial L or C coefficients are loaded to a table in the nanoVNA to reflect these deviations.

On Wed, 3 Jul 2019 at 13:19, alan victor <avictor73@...> wrote:

I should add, that after a calibration with their standards, the resulting
short, open and load are PERFECTLY located on the chart. Really! Wow, I
have to pray that a set of APC-7 or my sophisticated cal standards could do
so well. That said, this is a neat box and applying a little care to the
measurement and compensation for the short comings can rectify some of
these issues.

I'm afraid to say you are stepping into the error many people make. They
first calibrate with a set of standards, then see those standards look
perfect on the Smith Chart. I have hayfever at the moment, but made my
first YouTube video yesterday to show the problem.



Please ignore the sniffles I have and the fact I only used a mobile phone.


Tel 01621-680100 / +44 1621-680100

I should add, that after a calibration with their standards, the resulting short, open and load are PERFECTLY located on the chart. Really! Wow, I have to pray that a set of APC-7 or my sophisticated cal standards could do so well. That said, this is a neat box and applying a little care to the measurement and compensation for the short comings can rectify some of these issues.