Re: Strange peaks in S11 with load
no the OP, dk1vi, has his nanoVNA.
I am waiting on mine
toggle quoted message
Show quoted text
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
|
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
|
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.
toggle quoted message
Show quoted text
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
toggle quoted message
Show quoted text
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"
|
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
|
Has anyone got a source for the battery? Mine came without one.
Also, I see a reference to vers 1.2 of NanoVNASharp. I have 1.01. Any link to a possible update?
Does it require a firmware update to use 1.2?
Tnx!
--
73,
Mike, N1JEZ
"A closed mouth gathers no feet"
|
Would you please post a link to that site.
Burt, K6OQK
toggle quoted message
Show quoted text
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.
|
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,
|
Dr. David Kirkby from Kirkby Microwave Ltd
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,
|
Re: Calibration coefficients - can one change them?
Hello, Dr. David.
You can set the electrical delay with "DISPLAY, SCALE , ELECTRICALDELAY".
Yes, commercial calibrations are not required to be as short as possible, they can provide accurate correction data. But at a limited cost, it is easier for manufacturing to be as short and accurate as possible than to provide more accurate correction data. At the same time for HAMs with no VNA experience, it is easier to provide calibrations that no longer require additional data to be entered, although this is not precise enough, but the measurement below 1GHz is sufficient.
BTW£¬please forgive me for my poor English expression.
Thank you£¡
hugen
gen111.taobao.com
|
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
|
Active Loop Antenna captured S11
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
toggle quoted message
Show quoted text
-----Original Message----- From: Larry Rothman <ac293@...> To: nanovna-users < [email protected]> Sent: Wed, Jul 3, 2019 12:16 pm Subject: Re: [nanovna-users] Nano Vna Pre-Order? 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 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
toggle quoted message
Show quoted text
On 7/3/2019 4:00 PM, Burt K6OQK wrote: 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
|
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= [email protected]> 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 <[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
|
Nuno
Mike N1JEZ
Burt K6OQK
