开云体育

I'm in the UK but i can use antenna as well, same thing ;)

But the Nano can show the resonant frequencies of an antenna and that is fairly pertinent to how it would perform ?

David,
with NanoVNA you can not find out, if an antenna (think you called it 'aerial') is goo for your
purpose to receive signals, or not. Depends on your receiver, if it has an input impedance of
50 ohms, you could check, if your antenna has a good SWR or not. But SWR is only a matter
to match input (output) plus cable to the 'other side' = antenna. A good SWR says nothing
about the efficiency of an antenna. A 50 ohm resistor at the end of your coax cable will show
you an SWR of 1:1. This will be a perfect reading of S11, but that's not a good antenna.

To bring it to the point: nanoVNA is not a tool to let you know, if you are having a good and
efficient antenna for your existing receiver and the frequency you want to listen at all..

Hi all,
I have a NanoVNA, great little gadget, I'm interested in in aerials, at present for receiving only.

What would be the best output to look at for this purpose, i think its going to be S11 LogMag or SWR ??

Also if i was looking at say S11 Logmag results, what would be a value that tells me "this aerial is no good at that frequency" ??

Something like -10db or what??

Many thanks

Dave

Rune, many thanks for developing this software and making it available to us all. It *greatly* increases the enjoyment of using and learning the nanoVNA.

I went through the full 2-port cal yesterday and then used the device/program to graph the response of a band reject filter. I'm wondering why, after the cal routine, the S21 line is at a -10 dB level? I don't see a way to zero it prior to making a measurement, so all the data relating to any measurement will have a 10dB error...or perhaps I'm missing a step?



Thanks again and 73,

John AE5X

Dr. Kirkby,
it does confuse me a little why you would buy a VNA from AliExpress, but
not a battery from Amazon. ;-)

As long as ones expectations are correctly set - namely, to receive a
battery of an unknown capacity and quality, which might fail without
notice, but broadly speaking without catastrophic consequences, buying from
the sellers you mentioned should cause no particular problems.

I've seen no indications that the batteries sold on AliExpress or indeed on
Amazon should be any more dangerous than batteries bought elsewhere - and
given the price difference of roughly 10 times, the cheap batteries should
perform just fine for the average hobbyist reading this list and using a
NanoVNA.

Your recommendation to buy from a supplier for the *professional* market
does not particularly provide anything for the majority of us: Hobby users.

--
Rune / 5Q5R

On Thu, 26 Sep 2019 at 14:29, Dr. David Kirkby from Kirkby Microwave Ltd <
drkirkby@...> wrote:

On Thu, 26 Sep 2019 at 12:57, Carlos Cabezas <eb4fbz@...> wrote:

My battery started swelling after two charges. I am afraid it could
explode or damage the nanoVNA due to the pressure. I will change it as

soon

as possible.

Bought at AliExpress Guangyi0016 Store.

I would *never* buy batteries from eBay, AliExpress, Amazon or similar.
Just buy from a reputable distributor of components for the *professional*
market. In the UK, I would use Farnell, RS. Digikey would be sensible in
the USA. Use something made by Panasonic or other manufacturer of
batteries. If you buy from eBay or similar, you are likely to get 100%
genuine fakes.

As for claimed capacity, these seem to be generated with random number
generators.

If one mounts the NanoVNA in a larger enclosure, to make it more
mechanically reliable, then within reason, one can probably choose what
capacity battery one wants, although it would be sensible to check the data
sheet on the charger chip - someone did give the part number on here a few
weeks ago.

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

On Thu, 26 Sep 2019 at 12:57, Carlos Cabezas <eb4fbz@...> wrote:

My battery started swelling after two charges. I am afraid it could
explode or damage the nanoVNA due to the pressure. I will change it as soon
as possible.

Bought at AliExpress Guangyi0016 Store.

I would *never* buy batteries from eBay, AliExpress, Amazon or similar.
Just buy from a reputable distributor of components for the *professional*
market. In the UK, I would use Farnell, RS. Digikey would be sensible in
the USA. Use something made by Panasonic or other manufacturer of
batteries. If you buy from eBay or similar, you are likely to get 100%
genuine fakes.

As for claimed capacity, these seem to be generated with random number
generators.

If one mounts the NanoVNA in a larger enclosure, to make it more
mechanically reliable, then within reason, one can probably choose what
capacity battery one wants, although it would be sensible to check the data
sheet on the charger chip - someone did give the part number on here a few
weeks ago.

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

My battery started swelling after two charges. I am afraid it could explode or damage the nanoVNA due to the pressure. I will change it as soon as possible.

Bought at AliExpress Guangyi0016 Store.

On Thu, Sep 26, 2019 at 07:32 AM, BruceN wrote:

Where can we find the rest of this manual. Appears easy to read.

Bruce, K4TQL

Where can we find the rest of this manual. Appears easy to read.

Bruce, K4TQL

I had suggested this in a post from 2 weeks ago - to grey-out/disable the other on-screen buttons when the transform function is used.
I think I'll have to enter it as an issue on git.

@Gary O'Neil :
/g/nanovna-users/message/3070

Hello,

And thank you, once more, for your most
valuable contributions !

Well,

(1) regarding the objective requirement
for a distribution of the REGION executable,
allow us, please, to notice the useless result
of such an action, because, once again, this
file is not a standalone program but it constitutes
just the one part of this two-part /F/L/O/S/S/, and

(2) regarding the subjective concerns you most
reasonably expressed about your time, also
allow us, please, to notice that since the personal
taste is the decisive criterion that governs humans'
choices, and since the expediencies of any kind
were never dictated our acts, we are not be able
to the slightest to suggest you what to do in order
to meditate these worries of you.

Finally, since we mostly respect your efforts and
your time you spent to take a look at our humble
work, allow us, please, to conclude our communication
by thanking you, once again, very much!

Sincerely,

yin&pez@arg

Thank you Pluto

Hi Don,
permission issues I can't really help with - I expect that's a matter of
being root or not, or using sudo or not.

On Windows, I'm sorry to hear that you're experiencing crashes. If you
would like to run the program with the parameter "-D logfile.txt" (or
another filename of your choice), you can create a log of debug statements
from the software, so I can see what's going on. Running the software from
a command prompt (cmd.exe) should also allow you to see the final error
message/stack trace - I'd like to have that as well for debugging!

Thanks for trying it out, and for taking the time to report the errors you
are experiencing! :-)

--
Rune / 5Q5R

On Thu, 26 Sep 2019 at 11:19, Don Vosper via Groups.Io <donald.vosper=
[email protected]> wrote:

Hello.
I am new to Vector Network Analysers and I thought I would take advantages
of this affordable piece of test gear to learn something.
I am finding my way round the menus ok with the stand alone item but have
hit a couple of stumbling blocks with the Nanovna-saver software.
Running nanovna-saver.exe with windows 10 I can connect to the VNA ok but
the program crashes when I start to enter parameters. On occasions if I
enter parameters and connect in a certain order I get results but after a
while when changing things it will crash.
I though I would try it on Linux Mint. The installation went well until I
tried to instal pyqt5. I was unable to do this as it says I don't have
permission to download to the particular folder.
Any advice would be gratefully received.
Don, m5aky

Mine came with a 602035 (20x35x6mm) 400mA.
I bought two more spare batteries on Aliexpress (602035, 600mA)

Hello.
I am new to Vector Network Analysers and I thought I would take advantages of this affordable piece of test gear to learn something.
I am finding my way round the menus ok with the stand alone item but have hit a couple of stumbling blocks with the Nanovna-saver software.
Running nanovna-saver.exe with windows 10 I can connect to the VNA ok but the program crashes when I start to enter parameters. On occasions if I enter parameters and connect in a certain order I get results but after a while when changing things it will crash.
I though I would try it on Linux Mint. The installation went well until I tried to instal pyqt5. I was unable to do this as it says I don't have permission to download to the particular folder.
Any advice would be gratefully received.
Don, m5aky

Alex as you mentioned
1s 400mAh Lipo is 3.7volt

Thank you, Alex & Carlos.

Carlos can you please let me know the Voltage spec of your 602040
(20x40x6mm) 450mA pouch cell is it 3.7volt or 7.4 volt

ve2kwg,
Hiroh Satoh's (user "ch045") has written an informal user guide for the NanoVNA in Japanese. Attached is the Google translation of the "Time Domain Operations" section. For cable measurements, enable TDR by using low-pass mode in the time domain. I'm waiting to receive my second nanoVNA before loading the TDR firmware MOD so I haven't actually tried this yet.

I will suggest edy555 to do this automatic as after the domain transform the other display formats no longer make sense

that's right, I have found on reading nanovna manual chinese version translated to english.

thank you