开云体育

I have two older Android Phones, (Galaxy S III,
needs battery, and Galaxy S5). Free if you come
and get them.
I am in Vail, Arizona (20m SSE of Tucson).

73, Dick, W1KSZ
________________________________
From: [email protected] <[email protected]> on behalf of Larry Rothman <nlroth@...>
Sent: Friday, November 1, 2019 7:25 AM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Measuring swr

Or - have a look at the XDA forums for a new ROM:


On Friday, November 1, 2019, 10:17:16 a.m. GMT-4, Michael Dooley via Groups.Io <msdooley@...> wrote:

I bought my samsung galaxy note 3 a couple years ago to experiment on. At the time I had an iphone and the space debris (and satellite) tracking software I wanted to use was (and still is) only available for android.
I did not buy it as a phone, but as an android device. It cost me $15.00.

So instead of using your current phone, check with your friends and see if they will sell (or give) you their old android device to play with!
Mike de N5BGZ

On Friday, November 1, 2019, 03:21:15 AM CDT, Oristo <ormpoa@...> wrote:

> Pretty much the only way around it is to root your phone and install a 7.0 or

higher rom from XDA or one of the other sites that offer un-official upgrades.

.. or rebuild the app, specifying support for older Androids.
Build tools warns about most dependency issues.

Bruce,?
According to the IP5303 chip spec, it has an adaptive charge control and overcharge protection.

/g/nanovna-users/message/4298?
My experience with these chips is that they charge at a low rate - the 1.2A is the inverter output, not the charge current.
I charged an 1100mAH cellphone battery that I originally stuck on my 1st Nano - no issues but it took a long time to charge - but boy, did it ever have a long runtime.
...Larry

Hi Joe,This was done on the 1st (White Gecko) Nano I purchased (it had no shielding).I found it improved the noise level slightly (visually on the display) from what it was before, but I never really took any quantifiable measurements at the time.Sorry.

Lithium batteries are designed to be charged at a somewhat constant rate. Chargers are designed to limit that rate to whatever is safe for a battery. The charger in the nanoVNA is probably designed to deliver the current need to charge the 500 mah battery and no more. A larger capacity battery will require more charge time but there should be no issue with charging it with the built in charger. Just don't try to substitute a battery with higher voltage. You will destroy the battery and the charger.

Bruce, K4TQL

I know that many developers protect their work from deliberate claims of prior ownership. But, I suspect that many do not. There are three types of protection: copyright, patent, and trademark. Two of these, patents and trademarks, need to be registered to provide protection. Copyrights do not. A copyright will protect even if you don't register it. Registration will determine if you are truly the original author.

If I were a developer or author, I would at least copyright my work. It's easy to do. You just place a copyright mark on your work so that it can be obviously seen. If you want more protection, mail a copy of your work to yourself and keep it sealed. The postmark will give an indication of the date it was created. This is also good practice for patents and trademarks if you need to prove precedence of your work.

This link will tell you what protections copyrights give:

Check it out.

Bruce, K4TQL

Larry,
I see in the picture you posted the other day
/g/nanovna-users/attachment/223/0/Battery-PCB-MiscShields.jpg
that you have added extra shielding. I have a couple of questions on that. Did the shielding help the noise level? And also how do you measure the noise level?
I'm new at this and as far as I know the thing to do is to look at the LOGMAG trace with the corresponding port open and note how much the trace wiggles. Ideally the trace would be 1 at all frequencies since all energy is always reflected.

Or - have a look at the XDA forums for a new ROM:?

I bought my samsung galaxy note 3 a couple years ago to experiment on.? At the time I had an iphone and the space debris (and satellite) tracking software I wanted to use was (and still is) only available for android.? ?
I did not buy it as a phone, but as an android device.? It cost me $15.00.

So instead of using your current phone, check with your friends and see if they will sell (or give) you their old android device to play with!
Mike de N5BGZ

On Friday, November 1, 2019, 03:21:15 AM CDT, Oristo <ormpoa@...> wrote:

> Pretty much the only way around it is to root your phone and install a 7.0 or

higher rom from XDA or one of the other sites that offer un-official upgrades.

.. or rebuild the app, specifying support for older Androids.
Build tools warns about most dependency issues.

On Thu, Oct 31, 2019 at 09:23 PM, QRP RX wrote:

@edy555 and @hugen79 firmware takes 2 measurements (1 VBAT + 1 VREF).
NanoVNA-Q takes 64 measurements with average filter (32 VBAT + 32 VREF) with a
total measurement time about 1.24 ms (620.5 us + 620.5 us).

The filter was added, because 1 measurement is too noisy

So I see that much has been revealed by all of you while I slept! I awoke to new issues with a large project that I am beta testing, and got completely caught up in it.
A few quick comments before I dash.
I was thinking yesterday that the ST would present a very high impedance on VBAT when a) the unit is running, so VBAT is internally switched off, and b) VBATEN is off, so the bridge is not in the loop. I don't think that VBAT can source current, but I also don't know if its input is clamped low, even by a high impedance.
But this possibly explains why the measurement is noisy.
In the first place, BATT is not sourced by an isolated coin battery, but by a battery that is getting charged by a device that has some amount of ripple, however small.
And in addition, there is likely a 'startup' time from the time that VBATEN is toggled on to when the line settles.
32 samples seems like a lot, though...I'd have thought that after some settling time that 1-4 samples should be plenty.

So this is a good time to mention that I have embedded software and hardware dev experience, but I don't think that I know as much about this device, or even some of the specific issues we are addressing, as some of the others here.

For example, how do diodes behave at very low currents? Never had to think about it, but 40 uA is pretty small.
Can you share the data gathered during one battery sampling period? VBAT and VREF.(really VREFINT?) Please also share the sampling sequence...
When is VBATEN turned on and off? Is it for the whole time of 32 samples?
How does the hardware respond to ADC requests for samples?

STM32F072CBT6 ST RM0091 Reference manual DM00031936.pdf
13.4.5 Channel selection (CHSEL, SCANDIR)
The internal voltage reference VREFINT is connected to channel ADC_IN17. The VBAT channel is connected to channel ADC_IN18.

The manual has some discussion of settling time that I have not reviewed.
13.4.6 Programmable sampling time (SMP)
Which could possibly contribute to reducing the need for 32 samples.

I can see why the concern for removing the bridge when VBAT is supplied with something like a coin battery. But we have this honkin' big 450mAh+ battery. A test might be to put a high ohm resistor to ground from D2-, resulting in some sort of steady-state (SS) current flow. I realize that the bridge is already 100k. But the battery can source all the current that both circuits can consume.

I am under the impression that we concluded that Mike is seeing 4V+ at D2- because our DMMs have a slow response time, and the voltage dip during sampling is only 1 ms wide. And once the sampling begins, the diode drops the voltage at D2- just as we suppose it should, so the VBAT is not at risk.

Gotta dash...
73
--
On the banks of the Piscataqua
Rich NE1EE

The 'nosys" versions do not work - don't fully boot - just the 2 freqs along the bottom of the display

Thanks but what versions would they be equivalent to?Is the QRP build like 0.4.2 or 0.4.3 with the new options and fixes?And the other 2 builds - 0.3.2 or ??

...Larry

FYI.
Here is latest NanoVNA and NanoVNA-Q
-Branch_commit#.[bin/hex/dfu]
-Name with "_Os_nosys" changed compile/linker options
-I don't have those hardware, Please inform to me it works or not-

After flashing, I highly recommend to reset all configurations: "clearconfig 1234", then "reset"

Wow a lot of good information found. A seemingly simple thing like a battery indicator isn't so simple after all. :-O

The problem with shutting down the inverter is you lose the +5 for the 612's.
So - it may be more prudent to use a 2S battery (7.2V) and go through an LDO 5V linear reg and forget the 5303 altogether.
You can kludge something together that still charges the battery by using a separate 2S charger:


Stick it all in a printed housing along with N connectors and you'll have a nice device.
...Larry

The forum admin enabled hashtags a few weeks ago so you can add your own unique hashtag to every message you post??
- or -??
click on the subscription link on the left margin and then Group Profile link - you should see the option to display all your posts.

#69 : combined fortran, maxima and gnuplot code for [errors in "error" models]
-
references:
Jose Luu - 3 October 2019 : /g/nanovna-users/message/3812
Gary O'Neil - 17 October 2019 : /g/nanovna-users/message/5075
#60 - 20 October 2019 : /g/nanovna-users/message/5312

Hello,

Allow us, please, to inform you that we are in the process of revising and updating
our combined code for [errors in "error" models], so we are still staying far behind
of the replies we owe regarding the specific questions about our work
-
please accept our apologies.

Also, allow us, please, to inform you that during this process we need to tediously
look in various volumes of those nineteen 19 consisting the huge accompanying
documentation of [open watcom 2.0] (2017), so we thought to concentrate them,
by using the current version 9.5 of the free [pdfShaper]:



in just one very "handy" PDF volume of 6,136 pages, definitely responding to the
[Find] and [Search] capabilities of the free [PDFXchange] viewer:



which we just uploaded to [archive.org] at:



Sincerely,

gin&pez@arg

: 69#

Thanks for your suggestions Rune. I wouldn't put you to the trouble of trying to build an XP machine simply for this.
It is enough that the little Q1 works with NanoVNA Mod3 (as noted by QRP RX elsewhere).

Thanks to the group for all the other suggestions.

Kind regards
Tony

Pretty much the only way around it is to root your phone and install a 7.0 or
higher rom from XDA or one of the other sites that offer un-official upgrades.

.. or rebuild the app, specifying support for older Androids.
Build tools warns about most dependency issues.

Hi Larry -

Well, I have seen equipment where there is an enclosure covering electronics
on one side and a full metal shield on the underside of the PCB which is
screwed to the top enclosure through the board.

I >>suspect<< there might be worthwhile improvements on shielded nanoVNAs
by lining somewhat taller shields with this material.

My hope is for eventual smaller Bluetooth instruments
that delegate control and display to e.g. mobile apps.
Apple supports generic virtual COM port devices by Bluetooth, but not USB.

Given problematic power inverter noise, briefly shutting those down during each ADC sample
and running from capacitor storage would be more feasible if not powering a display.

1) Repository itself does not includes ChibiOS( git pull -f -t -p --all --recurse-submodules --progress )
2) U need ARM cross compiler( arm-none-eabi-gcc )
then, "make clean && make"