OK I started testing the charging current on my NVNA.
Typically 650ma on an empty 400ma supplied cell, oh dear !!!
I wasn't expecting that to be honest, I really did assume that there would be some controller regulating the current.
I consider that the IP5303 datasheet to be a bit misleading in my opinion.
Before I did the test, I also measure the current on a supposedly charged cell, and it wasn't actually any different.
Guess I'll be modding mine for an 18650 cell shortly.
Has anyone got a fire extinguisher that they can lend me ;)
73 de Andy
|
Re: sensitivity (instability)
Tnx Alan
This morning I made new cables with rg142 and I think the double sheild helped a lot...
once again tnx and I am getting happier more I discover those little wonders!
Richard
|
Well, no surprise. It was a scammer. Got Ebay refund yesterday.
|
Please DO NOT USE any LiIon battery that is beginning to swell !!!? Recycle it.Once a LiIon battery is starting to swell, its internal chemistry is unstable.
toggle quoted message
Show quoted text
On Wednesday, November 20, 2019, 10:27:54 a.m. GMT-5, KV5R <kv5r@...> wrote:
I figured it out! After earlier posting, I remembered I have a wall charger for those Galaxy S3 batteries; it uses contacts 1 & 3.
And then reading the label on one of them, remembered the NFC antenna. Verified with the bench DMM.
With the battery oriented contacts up and left, and calling leftmost contact #1:
1. DC +
2. NFC loop antenna (2.4k-ohms to #3, either polarity)
3. DC - , and other end of NFC loop antenna
4. n/c (resistance infinite, either polarity)
So I'll take the oldest one (just beginning to swell) and try to solder #30 wires, hopefully without melting the plastic case too much...
Gotta order some 2.5mm standoffs first.
Thanks Guys,
73, --kv5r
|
Re: sensitivity (instability)
I assume the YES is the answer to an antenna is under test. if the antenna physical dimension is not much larger than the vna and not current de coupled from the port, than the vna is part of the measurement system under test. The port Z will change as a consequence.
|
I figured it out! After earlier posting, I remembered I have a wall charger for those Galaxy S3 batteries; it uses contacts 1 & 3.
And then reading the label on one of them, remembered the NFC antenna. Verified with the bench DMM.
With the battery oriented contacts up and left, and calling leftmost contact #1:
1. DC +
2. NFC loop antenna (2.4k-ohms to #3, either polarity)
3. DC - , and other end of NFC loop antenna
4. n/c (resistance infinite, either polarity)
So I'll take the oldest one (just beginning to swell) and try to solder #30 wires, hopefully without melting the plastic case too much...
Gotta order some 2.5mm standoffs first.
Thanks Guys,
73, --kv5r
|
|
|
Sorry if this has been asked before but I mistakenly posted this in the NanoVNA-F group instead of this one.
Has anyone thought of implementing port extension functionality with on the fly adjustability like "real" network analyzers while on the instrument as well as the nanovna saver software?
The HP ones that I have used have an adjustment where you can simply increment the delay +/- with the 'wheelie" knob rather than input a discrete number (although you can if you want).
This makes it really simple to compensate for a fixture or a cable to quickly and easily move the reference plane.
Sam
W3OHM
|
I suppose one way of seeing how the charging system works is to use an inline
USB meter like this
I don't mind sacrificing my own cell for this test,so when it's empty I'll do a test
and see what happens ;-)
73 de Andy
|
Re: sensitivity (instability)
|
Re: sensitivity (instability)
So did you ever notice that the reading of S11 is pertubated if you touch or
not the nanovna. even if the nanovna is on the table
and my hand get close to the vna there is fluctuation in the reading My unshielded "worse" clone is quite immune to proximity effects. In fact, the only time it became a problem was an SMA cable gone defective, presumably a poor crimp between connector and cable braid
|
Re: sensitivity (instability)
What are you measuring, an antenna?
|
Re: sensitivity (instability)
Somehow got the wrong photo. Here is the correct one: /g/nanovna-users/photo/0/416?p=Created,,,20,2,400,0 and /g/nanovna-users/photo/0/417?p=Created,,,20,2,400,0 ...Larry
On Wed, Nov 20, 2019 at 08:20 AM, Larry Rothman wrote: Hi Richard,
This has been discussed a few times in the past month or so.The issue is that
the NanoVNA itself is not grounded so when you approach it, the near field
area changes.
A couple of forum members have mounted their Nanos on plastic boards they can
hold in order to minimise any measurement affects.
Have a look here: /g/nanovna-users/photo/0/416 On Wednesday, November 20, 2019, 7:52:02 a.m. GMT-5, ve2zvz via Groups.Io
<ve2zvz@...> wrote:
Bonjour ,Hi
i have been searching in old topics what i am experiencing and i did not find
anything.
So did you ever notice that the reading of S11 is pertubated if you touch or
not the nanovna.
even if the nanovna is on the table and my hand get close to the vna there is
fluctuation in the reading..
so what do you do to make shure it is ok?
Richard.
this happen whit naovna ,nanovna -h and nanovna -F as well but less for the
last one
|
NOTE: the order of the contacts I show below are NOT in any particular sequence!?
If you have the device that battery came out of, you can check which contact is ground and which is positive.
...Larry
toggle quoted message
Show quoted text
On Wednesday, November 20, 2019, 8:00:13 a.m. GMT-5, Larry Rothman <nlroth@...> wrote: The 4 contacts on a typical removable cellphone battery (some have 3) are used for: 1-positive contact 1-negative contact 1-temperature sense line 1-bi-directional data line Data line: Phones and other high-end devices with removable batteries are typically set up to accept only batteries that are manufactured by by an entity that is authorized and will query the battery over the data line. For example, Motorola Impres(R) batteries store the electronic serial number of the device, the charge capacity, # of times it's been recharged, etc. If you use a non-approved 3rd party battery on an MOT portable, the battery icon sometimes will not appear or will appear empty. XPR/APX series radios acknowledge the presence of an official MOT battery when turned-on. All you need to use are the external +/- contacts. Have a look at the old Motorola cellphone battery I used on my 1st Nano. /g/nanovna-users/photo/0/40 Cheers, Larry
|
sensitivity (instability)
Bonjour ,Hi
i have been searching in old topics what i am experiencing and i did not find anything.
So did you ever notice that the reading of S11 is pertubated if you touch or not the nanovna.
even if the nanovna is on the table and my hand get close to the vna there is fluctuation in the reading..
so what do you do to make shure it is ok?
Richard.
this happen whit naovna ,nanovna -h and nanovna -F as well but less for the last one
|
Re: Some required setting for NanoVNA-saver using female calibrations
Hi Rune I do not know if you noticed my information on how to measure high Z component where the port extension is an important addition. Likewise a new screen display/window showing Rp and Xp would be wonderful as these data we can only read for the marker data. The remove the problem where the R value is highly frequency dependent when and imaginary component is in play e.g. when measuring a component at the end of an adaptor. Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] < [email protected]> P? vegne af Rune Broberg Sendt: 20. november 2019 08:57 Til: [email protected]Emne: Re: [nanovna-users] Some required setting for NanoVNA-saver using female calibrations Hello Kurt, a value of 1 should work. But I haven't had time to test it thoroughly :-) I will look into making a value of 0 work as well, or give an error if it is not possible. "Port extension" delay setting is in the works, but I'm looking at where to put the control in the interface. -- Rune / 5Q5R
On Wed, 20 Nov 2019 at 02:45, Kurt Poulsen <kurt@...> wrote: Hi Run
Aha, thank you for the info. That is a nasty one ?
Then a value of 1 might me OK ?
Kind regards
Kurt
-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af
Rune Broberg
Sendt: 19. november 2019 17:40
Til: [email protected]
Emne: Re: [nanovna-users] Some required setting for NanoVNA-saver
using female calibrations
Hi Kurt,
Sorry for taking long to reply to your email.
The issue in your earlier tests seem to be with C0=0: the calibration
corrections divide by a value that is dependant on C0, and for that
reason,
C0=0 is not a valid standard - and the custom settings for the "open"
is disabled, including delay.
--
Rune / 5Q5R
On Tue, 19 Nov 2019, 16:02 Kurt Poulsen, < <mailto:kurt@...>
kurt@...> wrote:
Hi All In the NanoVNA-saver the calibration settings, when doing a female calibration with the supplied NanoVNA calibration kit, where the
male SOL parts are fitted to the FF adaptor, need some special settings until Rune gets fixing the following: The Open delay does not work and substituted by a C0 setting as
shown in attached image of 1022.3 fF Do not use the open calibration standard just leave the FF adaptor open As Shunt C for the load not yet implemented an inductance og 205pH introduced as temporary fix
The data are for the NanoVNA-H delivered after end October. The earlier delivered kits are for Short and Load identical but the delay of FF adaptor is a bit longer and 70.3ps Remember the NanVNA internal C0 calibration must be done prior to using the NanoVNA-saver with the same setup as when calibration with the NanoVNA-saver Kind regards Kurt
|
Re: Some required setting for NanoVNA-saver using female calibrations
Hi Rune I will modify my calibration document and maintain the 50fF (it might be forgotten to delete/change) and adjyst the dealy accordingly. I think this is the safe way. I will also add NanoVNA-saver screen dumps about calibration settings I will update the information I issued earlier Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] < [email protected]> P? vegne af Rune Broberg Sendt: 20. november 2019 08:57 Til: [email protected]Emne: Re: [nanovna-users] Some required setting for NanoVNA-saver using female calibrations Hello Kurt, a value of 1 should work. But I haven't had time to test it thoroughly :-) I will look into making a value of 0 work as well, or give an error if it is not possible. "Port extension" delay setting is in the works, but I'm looking at where to put the control in the interface. -- Rune / 5Q5R
On Wed, 20 Nov 2019 at 02:45, Kurt Poulsen <kurt@...> wrote: Hi Run
Aha, thank you for the info. That is a nasty one ?
Then a value of 1 might me OK ?
Kind regards
Kurt
-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af
Rune Broberg
Sendt: 19. november 2019 17:40
Til: [email protected]
Emne: Re: [nanovna-users] Some required setting for NanoVNA-saver
using female calibrations
Hi Kurt,
Sorry for taking long to reply to your email.
The issue in your earlier tests seem to be with C0=0: the calibration
corrections divide by a value that is dependant on C0, and for that
reason,
C0=0 is not a valid standard - and the custom settings for the "open"
is disabled, including delay.
--
Rune / 5Q5R
On Tue, 19 Nov 2019, 16:02 Kurt Poulsen, < <mailto:kurt@...>
kurt@...> wrote:
Hi All In the NanoVNA-saver the calibration settings, when doing a female calibration with the supplied NanoVNA calibration kit, where the
male SOL parts are fitted to the FF adaptor, need some special settings until Rune gets fixing the following: The Open delay does not work and substituted by a C0 setting as
shown in attached image of 1022.3 fF Do not use the open calibration standard just leave the FF adaptor open As Shunt C for the load not yet implemented an inductance og 205pH introduced as temporary fix
The data are for the NanoVNA-H delivered after end October. The earlier delivered kits are for Short and Load identical but the delay of FF adaptor is a bit longer and 70.3ps Remember the NanVNA internal C0 calibration must be done prior to using the NanoVNA-saver with the same setup as when calibration with the NanoVNA-saver Kind regards Kurt
|
Re: Some required setting for NanoVNA-saver using female calibrations
Not sure. I often use port extensions when measuring a DUT with a different cable. Being able to quickly rotate the cable away during regular measurement is a very nice feature. Also it would help if nanoVNA-saver can calculate the extension to do the rotation (simplest way is to rotate S11 of the highest frequency response in the scan back to zero degrees phase shift) -- NanoVNA Wiki: /g/nanovna-users/wiki/homeNanoVNA Files: /g/nanovna-users/filesErik, PD0EK
|
Greetings to the Battery Group :)
I have some batteries for Samsung Galaxy S3, 2100mAH, that are a just a bit smaller than the nano and would fit inside with slightly longer standoffs.
But here the question: these phone batteries have 4 connections; I can measure positive voltage on one, negative on the 3 others. Does anyone know if these 4-terminal phone batteries have internal protection, and are they safe to use as a 2-wire battery? What do the other 2 connections do, in the normal phone purpose?
Thanks, --kv5r
|
Re: Some required setting for NanoVNA-saver using female calibrations
Hi Rune , in my opinion ,the right place of the port extension control , is on the calibration menu.
Best regards
Maurizio IZ1MDJ
|
Sam Reaves
Oristo
Kurt Poulsen