开云体育

On Thu, Jan 9, 2020 at 11:16 PM, <hugen@...> wrote:

We are still selling through Alibaba, and bulk purchases will be even more favorable due to postage.


hugen
===========================================================

Basic specifications from the Alibaba store:

ABS case: 75mm x 133mm x 18mm (excluding protrusions)
Measurement frequency: 10KHz -1.5GHz
RF output: 0dbm (±2dbm)
Measurement range: 70dB (50kHz-300MHz), 60dB (300M-900MHz), 40dB(0.9G-1.5GHz));
There may be errors caused by nonlinear transformation of fundamental wave when using harmonic measurement.
Port SWR: < 1.1
Display: 3.95 inch TFT (320 x 480)
USB interface: USB type-C communication mode: CDC (serial)
Power: USB 5V 200mA, built-in 1950mAh battery, maximum charging current 1A
Number of scanning points: 101 (fixed)
Display Tracking: 4, Marking: 4, Setting Save: 5
Frequency Tolerance:<2.5ppm
Frequency Stability:<0.5ppm

Packing list
NanoVNA host (with 1950mAh battery) x 1
USB Type-C data cable x1
15cm SMA male to male RG316 RF cable x2
SMA male calibration kit - OPEN x1
SMA male calibration kit - SHORT x1
SMA male calibration kit - LOAD x1
SMA female to female connector x1
Type-c to Type-c cable x1

Notable changes:

RF output @ 0dbm (±2dbm) is higher than previous version
Measurement range above 900 Mhz is greater 40dB(0.9G-1.5GHz)
Larger display @ 3.95 inch TFT (320 x 480)
Better quality cables @ 15cm SMA male to male RG316 RF cable x2

Sample price is 60 usd.

- Herb

On Fri, Jan 10, 2020 at 07:33 PM, Dr. David Kirkby, Kirkby Microwave Ltd wrote:

LOn Fri, 10 Jan 2020 at 07:16, <hugen@...> wrote:

This version was ported by Ken Liao (AA6KL). You can check the following

links to learn about the development process.
/g/nanovna-users/topic/33107519
/g/nanovna-users/topic/61079748



We are still selling through Alibaba, and bulk purchases will be even more
favorable due to postage.

hugen

Can you send a *PayPal invoice* to someone so he can pay via PayPay? If
not, why not? A guy at my radio club wants one, but will not use
Alibaba.com

Dave
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...

Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom

Paypal is OK. If you need to trade with PayPal, please contact Maggie through Alibaba.


hugen

David,
A few of us have made purchases using Paypal. The procedure is to leave a message with Maggie King at hugen's Alibaba store that you want to use Paypal. She will send you her Paypal email. Once she receives the Paypal payment she will ship the product. Express delivery via DHL is an extra $10.

- Herb

On Fri, Jan 10, 2020 at 12:22 PM, Klaus W?rner wrote:

I've measured with the VA5.
The measurements are the same.

Hello Klaus,
Your Smith chart 8.png of test field 8 (470 nH) shows at low frequency an Open.
That can not be correct.

To verify your calibration please test:
My Smith chart in diagram RF-Demo-Kit_15-Load_nanovna.png shows
Test field 15 Load (50 Ohm). That should show just a dot in the center.

Could you reproduce that?
73, Rudi DL5FA

On Thu, Jan 9, 2020 at 11:16 PM, @ColinDexter wrote:

Loads are good. When I calibrate my nanovna-f with it everything’s works
perfect.

You can help people helping you by posting some picture.

Steps to take:
1: Go to calibration and do a reset and just to be sure switch the calibration off. (did you switch it on after doing your calibration???)
2: take a picture of the nanoVNA screen doing 0-900MHZ scan with nothing connected.
3: take a picture of the nanoVNA screen doing 0-900MHZ scan with the short connected to CH0. Do NOT use a cable but connect the short directly to the CH0 SMA
4: take a picture of the nanoVNA screen doing 0-900MHZ scan with the load connected Do NOT use a cable but connect the load directly to the CH0 SMA

This will provide evidence you nanoVNA correctly measures functional calibration loads.

If this all is correct you have to reread the documentation in the wiki describing how to do the calibration.

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

I would assume that NanoVNA-saver would run just fine under Gallium

We already have reports of a Linux distro with dependencies on a specific Python version
that is incompatible with NanoVNA-saver.
While running multiple Python versions is possible, screwing things up is also possible.

LOn Fri, 10 Jan 2020 at 07:16, <hugen@...> wrote:

This version was ported by Ken Liao (AA6KL). You can check the following

links to learn about the development process.
/g/nanovna-users/topic/33107519
/g/nanovna-users/topic/61079748



We are still selling through Alibaba, and bulk purchases will be even more
favorable due to postage.



hugen

Can you send a *PayPal invoice* to someone so he can pay via PayPay? If
not, why not? A guy at my radio club wants one, but will not use
Alibaba.com

Dave
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...

Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom

I have a nanovna that continues to indicate 50 ohms when S11 is open. Only if
I short-circuit the input will this change. I already calibrated it. But this
did not help. Can I do something about this or is it just damaged

That very much smells like bad calibration, which I get far too often.
Watch Smith display during calibration.
It will generally be incorrect, but should change between open, short and load.

I've measured with the VA5.
The measurements are the same.

On 1/9/20 9:32 PM, hwalker wrote:

Does NanoVNA-saver run O.K. under Gallium?

???? NanoVNA-saver is written in Python.? Gallium is based on/compatible with Xubuntu, and Python is available in the Ubuntu repositories.? So, I would assume that NanoVNA-saver would run just fine under Gallium, with one caveat:? Gallium only runs on Chrome devices based on Intel or AMD processors, but does not run on ARM processors.? If you don't know what sort of processor is in your Chromebook, check here:

This version was ported by Ken Liao (AA6KL). You can check the following links to learn about the development process.
/g/nanovna-users/topic/33107519
/g/nanovna-users/topic/61079748



We are still selling through Alibaba, and bulk purchases will be even more favorable due to postage.


hugen

Loads are good. When I calibrate my nanovna-f with it everything’s works perfect. Just to be sure I have measured them and they are correct.

Hi Rune,

Thank you very much for the wonderful nanovna-saver software. Python isn't my forte but I managed to install it on my Debian laptops without much of a hassle (Python3.7 was already installed in Debian 10/Buster).

I am fairly new to VNAs in general and the NanoVNA environment specifically, so please forgive my ignorance if what I'm asking is already present in nanovna-saver.

I'm helping a friend to determine the effectiveness of common-mode chokes. I created a test-jig (as shown on ) to perform 2-port measurements. For chokes to be effective we want to get an idea of the Resistive component at a given frequency. Currently I don't see an S21 graph in nanovna-saver that will show this. I know I can make use of S21 Phase (deg) and S21 LogMag / Gain graphs to compute S21 R, X and Z but I wonder if the latter values (R X and Z) can be added to the list of graphs? Alternatively, would it be possible to create a 'custom' graph so that the user can post-process data and draw their own graph based on their own formulas?

Keep up the good work and happy 2020.

Regards,
marcel VK2CEL

Does NanoVNA-saver run O.K. under Gallium?

- Herb[

On 1/9/20 3:55 PM, WB2UAQ wrote:

I bet SimSmith will make it even easier but right now I don't have the patience to sit still and figure out how to run it:)

???? You won't need any patience, it's amazingly simple.? Like drop in an LC element between two impedances, and it automatically calculates appropriate values to match.? Tell it you want a high pass instead of a low pass, and it automatically recalculates.

Have not found anything on the net that indicates Android apps will run under Gallium. Anbox, which "puts the Android operating system in a container" runs under various Linux distros, but the scuttlebutt is that it has problems running inside Gallium.

Thanks Hans for taking the time to explain your methods. I have been doing a lot of testing with my Nano since I rec'd it at the end of August. The s1p formatted data has been most useful. I mainly measure impedance with the Nano. Then have done some impedance matching with good results giving me confidence that the measurements are pretty good. If you measure the Z to be matched, calculate a matching circuit, build it and the SWR is 1.0:1. I have not used SimSmith but have down loaded it. Years ago (some time in the early 90's possibly) I learned how to calculate the matching elements using an HP32S calculator that can store and run simple conversion formulas. I programmed in the series to parallel and parallel to series converters and with them it is possible to determine the L's and C's required. I bet SimSmith will make it even easier but right now I don't have the patience to sit still and figure out how to run it:)
In regard to the EFHW, the latest antenna craze, I wondered about the feed point Z of 67 feet of wire running from the ground up to a tree a steep angle (>45 degs for sure). I used an ancient General Radio GR-821A and did a direct measurement against a ground stake. The GR-821A can measure high impedances directly and it came up with 3700 to 3900 ohms shunted by about 8.5 pF at 7 MHz. I ran some tests at three locations that had I, am hoping, three different ground conductivities. The results were very close to each other. Using a transformer (2 turn primary and 18 turn secondary) I have great results on 40 and 20 meters.
Wish I could help out Chris with his questions. I have been where he is now. Takes some study and it will all fall into place. I am very cautious about making a solid conclusion due to common mode current on the outside of the coax line from measured impedances. One small change to how the transmssion line is routed and how long it is and what the mismatch at the antenna is will have an impact. What I have come to learn is that when the feed point impedance is low there is less common mode current and therefore less impact to the impedance measured. When the Z is high, then there is more of a tendency for current to flow on the coax braid and the impedance measured will be impacted. I have see the Z move by simply moving how the coax is placed or coiled up, etc..
73, Pete

Yup!

I have an old Acer C710 with Gallium Linux installed. Opened the Chrome browser under Gallium Linux, enabled the experimental web thingy in chrome://flags, loaded the NanoVNA Web Client...then I had to root around a bit to figure out the device path for the Nano (for me, it is ttyACM0), selected that (from the 20 or so options) in the connect box, and Voila!

166 ?H is a pretty large inductor and likely has a pretty low self resonant
frequency. Try 'de-Qing" the inductor by parallelling it with a 4.7 k to
10 k carbon resistor. If those work, increase the resistance a bit.

Dave - W?LEV

--

*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*

entilleser via Groups.Io wrote:

Ah... Got it. I have not heard good things about the Chromebook implementation of Android apps - slow, buggy, &c...

GalliumOS for the Chromebook isn't trying to run Android apps under ChromeOS. It's a full and fairly robust distribution of Linux which is either available as a boot option, or completely replaces the entire ChromeOS nightmare.

It makes an "obsolete" and "unsupportable, just throw it in the recycle bin and buy a new one" Chromebook into a very usable and handy Linux notebook; decent screen, light in weight, blazingly fast to boot up, and very compatible with about any Linux software available.

--
wes will
n9kdy