Re: Strange peaks in S11 with load
Hello hugen,
I am very glad that you are taking care of my problem. So I do not have to send my unit back.
Thank you in advance for your efforts.
Ernst
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Two bad clones have been found, they have failed to understand the role of bridge and shielding, and made some bad modifications to facilitate manufacturing.
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Hi Siggi/Hugen,
I have managed to place an order using the Chinese taobao site, which was
rather interesting as I cannot read Chinese at all :)
Hopefully you got my order in your shop Hugen !
I found a few things that were different to what I expected so maybe this
will help:
* You can enter your address before starting the purchase process. It is
under your username then account.
* Enter your address all on one line seperated by commas. If you hit enter
after each line it will show a red error.
* Use the standalone google translate page to translate your country name
into Chinese Simplified. Then you can recognise the Chinese characters when
you need to select it.
* You need to click the image of the NanoVNA which then switches the price
to 299, shown in the Red circle in Hugen's reply - the range in prices are
for the various adapters pictured. Only one option is the VNA itself.
* You need to select overseas in the option just above those little
pictures too. Googles translate says "Shanghai to the country". Pick
Overseas and then your country.
* Google Chrome tries to translate by default, which breaks the "Buy"
button so you need to turn off translate when you get to this point or use
Firefox or something else.
* Use the standalone google translate for the parts that don't make sense.
Copy paste.
Anyway I thought you deserved some reward for your work Hugen. I have no
idea if I have actually purchased it correctly, time will tell :)
Cheers,
Roger
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On Fri, 5 Jul 2019 at 13:35, <hugen@...> wrote: Thank you, Siggi
You can try switching the regional options of Taobao.
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Thank you, Siggi
You can try switching the regional options of Taobao.
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Re: Strange peaks in S11 with load
On Fri, Jul 5, 2019 at 12:40 AM, dk1vi wrote:
Hi,
got my nanoVNA today (black edition from banggood). Included was a set of cal
standards: load, open, short and through with 2 SMA cables. As far I can
judge, they are good quality. I measured Rl to be better -40dB with my old hp
8410 VNA @900MHz.
No battery was included. Does someone have a more detailed specification? I
know it is 400mAh, but what technology (NiMH, LiPo etc.) and what voltage? I
will try to find a supplier preferably in Germany.
No problems with NanoVNA 1.03 working perfectly on Windows 10 x64.
However after calibration I see strong and very annoying peaks in S11 with
load connected. The peaks at approx. 300MHz and its harmonics jump up and down
tens of dB. See picture enclosed. So I am very disappointed aboout this.
The peaks are independent of the laptop connected. Any ideas how to cure?
Regards Ernst
Hello dk1vi , Peaks occur because si5351 is working at the limit£¬I will update an 800MHz firmware later to improve this problem. Thank you£¡ hugen gen111.taobao.com
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Re: Strange peaks in S11 with load
I just had the same idea. Scan from 50MHz to 200MHz for example and the plots look good.
Tomorrow I will inspect the PCB and see if all components are soldered properly.
Ernst
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Re: Strange peaks in S11 with load
Understood Ernst. Good observation. It will be of interest if other users report this situation. I assume if you do a cal that eliminates those frequency points, that is select a stimulus frequency range that does not include those edge frequency points, the cal looks good. ________________________________ From: [email protected] < [email protected]> on behalf of dk1vi <dk1vi@...> Sent: Thursday, July 4, 2019 7:19 PM To: [email protected]Subject: Re: [nanovna-users] Strange peaks in S11 with load [Edited Message Follows] Alan, the peaks are always on the edges of the three frequency ranges 52k-300MHz, 300-600MHz and 600-900MHz. So I think it has somethoing to do with the timing of range switching. Probably the hardware designer has an idea. There is no poor contact of the load to the SMA connector. Ernst
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Re: Strange peaks in S11 with load
Alan,
the peaks are always on the edges of the three frequency ranges 52k-300MHz, 300-600MHz and 600-900MHz. So I think it has somethoing to do with the timing of range switching.
Probably the hardware designer has an idea.
There is no poor contact of the load to the SMA connector.
Ernst
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Re: Strange peaks in S11 with load
Hi Ernst.
I would check with care that the SMA terminations during cal are all secure. I would like to use a torque wrench designed for proper tightness for each piece. However, these connectors on the nanoVNA are going to take a beating over the long term. I suggest you get some connector savers to help protect the SMA connectors on the instrument. Then you can provide secure tightness of the cal units. It would appear that there is an issue in the CAL. Alan
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Re: Strange peaks in S11 with load
You may wish to check your sNp file. There could be an interpolation issue that is creating the discontinuity. I have seen such problems in "professional" SW like ADS and Microwave Office. ________________________________ From: [email protected] < [email protected]> on behalf of alan victor <avictor73@...> Sent: Thursday, July 4, 2019 6:52 PM To: [email protected]Subject: Re: [nanovna-users] Strange peaks in S11 with load Good day, Ok, I just took a measurement after cal with the nanoVNA and then captured that data using their SW, There are two measurement .jpg attached. The first is their 50 termination after cal. Yes, nice cal. The second is a quality 50 ohm termination. Yes, the return loss at 900 MHz is about 18 dB. This is an issue that is part of another discussion. However, focus on your issue, I do not see their SW causing spikes in the data. Alan ________________________________ From: [email protected] < [email protected]> on behalf of amirb <amir.borji@...> Sent: Thursday, July 4, 2019 6:40 PM To: [email protected]Subject: Re: [nanovna-users] Strange peaks in S11 with load no the OP, dk1vi, has his nanoVNA. I am waiting on mine On Thu, Jul 4, 2019 at 02:25 PM, alan victor wrote:
You are waiting on the unit to be shipped. So I assume this is a measurement
of another VNA using whose 50 ohm termination? Is the issue you are raising
the software or the hardware? I can input a touchstone file from another
instrument and a "good" 50 ohm termination and plot log mag s11 and see if I
detect spikes (due to interpolation?) in the plotted data.
Alan
________________________________
From: [email protected] <[email protected]> on behalf of amirb
<amir.borji@...>
Sent: Thursday, July 4, 2019 5:11 PM
To: [email protected]
Subject: Re: [nanovna-users] Strange peaks in S11 with load
this looks awful !
I am still waiting for mine to be shipped but this result got me
scared/disappointed :-(
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Re: Strange peaks in S11 with load
Hi Alan,
your plots look excellent, I wish mine would look same. The peaks are not related to the nanoVNA software V1.03. I see the peaks when I use the nanoVNA not connected to the laptop.
Ernst
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Re: Strange peaks in S11 with load
Good day, Ok, I just took a measurement after cal with the nanoVNA and then captured that data using their SW, There are two measurement .jpg attached. The first is their 50 termination after cal. Yes, nice cal. The second is a quality 50 ohm termination. Yes, the return loss at 900 MHz is about 18 dB. This is an issue that is part of another discussion. However, focus on your issue, I do not see their SW causing spikes in the data. Alan ________________________________ From: [email protected] < [email protected]> on behalf of amirb <amir.borji@...> Sent: Thursday, July 4, 2019 6:40 PM To: [email protected]Subject: Re: [nanovna-users] Strange peaks in S11 with load no the OP, dk1vi, has his nanoVNA. I am waiting on mine On Thu, Jul 4, 2019 at 02:25 PM, alan victor wrote:
You are waiting on the unit to be shipped. So I assume this is a measurement
of another VNA using whose 50 ohm termination? Is the issue you are raising
the software or the hardware? I can input a touchstone file from another
instrument and a "good" 50 ohm termination and plot log mag s11 and see if I
detect spikes (due to interpolation?) in the plotted data.
Alan
________________________________
From: [email protected] <[email protected]> on behalf of amirb
<amir.borji@...>
Sent: Thursday, July 4, 2019 5:11 PM
To: [email protected]
Subject: Re: [nanovna-users] Strange peaks in S11 with load
this looks awful !
I am still waiting for mine to be shipped but this result got me
scared/disappointed :-(
|
Re: Strange peaks in S11 with load
no the OP, dk1vi, has his nanoVNA.
I am waiting on mine
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On Thu, Jul 4, 2019 at 02:25 PM, alan victor wrote:
You are waiting on the unit to be shipped. So I assume this is a measurement
of another VNA using whose 50 ohm termination? Is the issue you are raising
the software or the hardware? I can input a touchstone file from another
instrument and a "good" 50 ohm termination and plot log mag s11 and see if I
detect spikes (due to interpolation?) in the plotted data.
Alan
________________________________
From: [email protected] <[email protected]> on behalf of amirb
<amir.borji@...>
Sent: Thursday, July 4, 2019 5:11 PM
To: [email protected]
Subject: Re: [nanovna-users] Strange peaks in S11 with load
this looks awful !
I am still waiting for mine to be shipped but this result got me
scared/disappointed :-(
|
Re: Strange peaks in S11 with load
You are waiting on the unit to be shipped. So I assume this is a measurement of another VNA using whose 50 ohm termination? Is the issue you are raising the software or the hardware? I can input a touchstone file from another instrument and a "good" 50 ohm termination and plot log mag s11 and see if I detect spikes (due to interpolation?) in the plotted data. Alan ________________________________ From: [email protected] < [email protected]> on behalf of amirb <amir.borji@...> Sent: Thursday, July 4, 2019 5:11 PM To: [email protected]Subject: Re: [nanovna-users] Strange peaks in S11 with load this looks awful ! I am still waiting for mine to be shipped but this result got me scared/disappointed :-(
|
Re: Strange peaks in S11 with load
this looks awful !
I am still waiting for mine to be shipped but this result got me scared/disappointed :-(
|
See my topic ¡°inside views¡±. I¡¯ve used a 300mah lipo battery, but is a bit large. Ordered and arrived from a near by store a 280mah wich should fit perfectly. Recomended size: 20x30 (max 45) x 5mm.
73¡¯²õ
Nuno CT1JQJ
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Strange peaks in S11 with load
Hi,
got my nanoVNA today (black edition from banggood). Included was a set of cal standards: load, open, short and through with 2 SMA cables. As far I can judge, they are good quality. I measured Rl to be better -40dB with my old hp 8410 VNA @900MHz.
No battery was included. Does someone have a more detailed specification? I know it is 400mAh, but what technology (NiMH, LiPo etc.) and what voltage? I will try to find a supplier preferably in Germany.
No problems with NanoVNA 1.03 working perfectly on Windows 10 x64.
However after calibration I see strong and very annoying peaks in S11 with load connected. The peaks at approx. 300MHz and its harmonics jump up and down tens of dB. See picture enclosed. So I am very disappointed aboout this.
The peaks are independent of the laptop connected. Any ideas how to cure?
Regards Ernst
|
Hey Hugen,
I've been to your TaoBao site (), but even with
English translation on the site/page, I can't figure out how to buy one.
The shopping cart doesn't seem to work for me, and I'm not sure why the
price should vary from 2-299 yuan. I guess there are different items for
sale - maybe e.g. calibration kits or some.
Do you sell it anywhere else?
Siggi
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Sure:
Again, it was only a single experience. But I was pleased enough that I'll
purchase again just to have an experimental unit for flashing firmware and
experimenting.
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On Thu, Jul 4, 2019 at 8:29 AM Burt K6OQK <biwa@...> wrote: Would you please post a link to that site.
Burt, K6OQK
On July 4, 2019 5:22:03 AM PDT, Paul Alfille <paul.alfille@...>
wrote:
I bought the NanoVNA from elecdesign2015 on ebay and got the item
pretty
quickly, including battery and cables and short/open/load tests for
under
$60.
The battery was charged. I'm able to talk to the device using Larry
Rothman's serial command guidelines. The unit comes with 900MHz
firmware
installed.
So I'd recommend this vendor, at least for US purchasers.
On Thu, Jul 4, 2019 at 12:28 AM Dr. David Kirkby from Kirkby Microwave
Ltd <
drkirkby@...> wrote:
On Wed, 3 Jul 2019 at 20:06, Stuart Landau via Groups.Io <stuartl73=
[email protected]> wrote:
I looked at Aliexpress but saw no one offering a battery.
eBay item 254253727598 has a 400 mA hr battery. I ordered one on the 6th
June, but it was not dispatched until the 29th June, so you might want to
consider that.
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
How EXACTLY are you determining that the return loss will be at least
40 dB
@ 900 MHz? What VNA and what calibration kit are you using? What is the
uncertainty of your measurements? Does the load have a nut that rotates
independently of the body?
Dave
-----Original Message-----
From: Larry Rothman <ac293@...>
To: nanovna-users <[email protected]>
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
-- Dr. David Kirkby,
--
Sent from my Android thingamabob with K-9 Mail. Please pardon the spelling
errors as the dog can't spell so good.
|
Tnx Larry!
I downloaded 1.03 Next to grab a battery locally and install the boot switch.
Mike
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On 7/4/2019 9:22 AM, Larry Rothman wrote: Mike,
There is a link in Hugen's threads that point to the new nanovnasharp version - he's writing it.
As for a battery, I used an old Motorola cellphone battery from a RAZR and attached it with 2way tape to the rear.
I guess I could have used longer standoffs and mounted it inside the rear panel - works great and it 800MAh and is 4mm thick.
You can use a battery from any larger bluetooth headset as well.
You should be able to pick these up locally really cheap.
If you want to install shields, use parts from an old cellphone.
I mounted a push button sw on the Boot pads so I can place the unit into DFU mode to push FW to it. Get that from a cellphone as well.
Regards,
Larry
--
73,
Mike, N1JEZ
"A closed mouth gathers no feet"
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Nuno
Mike N1JEZ