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Take the battery out and run it on USB power.

Roger

It could measure 4.1V but have high internal resistance. That would cause it to fail under load. I take it that the SA runs OK on USB power?

On Thu, 24 Oct 2024 22:43:17 -0400
"Jim Ancona N1ADJ via groups.io" <jim@...> wrote:

Currently mine runs for one second after I turn it on. Given that the
battery measures 4.1 volts, do you still think it's a battery issue?

Jim

On Thu, Oct 24, 2024 at 10:34?PM Jim Shorney via groups.io <jimNU0C=
[email protected]> wrote:

Start from a fresh charge and see how long it takes to run the battery
down and turn off. "Runtime test" is easier to type. :)

Recharge it immediately when done.

On Thu, 24 Oct 2024 22:27:17 -0400
"Jim Ancona N1ADJ via groups.io" <jim@...> wrote:

What do you mean by a runtime test? I tried searching but didn't come up
with anything.

--

73

-Jim
NU0C

--

73

-Jim
NU0C

Currently mine runs for one second after I turn it on. Given that the
battery measures 4.1 volts, do you still think it's a battery issue?

Jim

On Thu, Oct 24, 2024 at 10:34?PM Jim Shorney via groups.io <jimNU0C=
[email protected]> wrote:

Start from a fresh charge and see how long it takes to run the battery
down and turn off. "Runtime test" is easier to type. :)

Recharge it immediately when done.

On Thu, 24 Oct 2024 22:27:17 -0400
"Jim Ancona N1ADJ via groups.io" <jim@...> wrote:

What do you mean by a runtime test? I tried searching but didn't come up
with anything.

--

73

-Jim
NU0C

Start from a fresh charge and see how long it takes to run the battery down and turn off. "Runtime test" is easier to type. :)

Recharge it immediately when done.

On Thu, 24 Oct 2024 22:27:17 -0400
"Jim Ancona N1ADJ via groups.io" <jim@...> wrote:

What do you mean by a runtime test? I tried searching but didn't come up
with anything.

--

73

-Jim
NU0C

On Thu, Oct 24, 2024 at 10:05?PM Jim Shorney via groups.io <jimNU0C=
[email protected]> wrote:

I would say do a runtime test on it. That will tell you one way or the
other. But do remember to maintenance charge it if you don't use it for a
long period of time.

What do you mean by a runtime test? I tried searching but didn't come up
with anything.

Thanks,

Jim

It could also be crud in the power switch. My TinySA was a victim of that.
It was highly intermittent. I opened it tonight and after unplugging the
battery I vigorously exercised the switch a couple of dozen times. That
helped. If the problem comes back I will hit it with some CRC cleaner and
maybe DeOxit Gold.


On Thu, 24 Oct 2024 21:39:07 -0400
"Jim Ancona N1ADJ via groups.io" <jim@...> wrote:

I like the battery theory, but I measure 4.1 volts across the battery
terminals with the unit turned on (battery is marked 3.7v) and the device
behaves exactly the same way when plugged into the charger with the

battery

disconnected. Neither of those seems consistent with the battery being

the

problem.

--

73

-Jim
NU0C

I would say do a runtime test on it. That will tell you one way or the other. But do remember to maintenance charge it if you don't use it for a long period of time.

It could also be crud in the power switch. My TinySA was a victim of that. It was highly intermittent. I opened it tonight and after unplugging the battery I vigorously exercised the switch a couple of dozen times. That helped. If the problem comes back I will hit it with some CRC cleaner and maybe DeOxit Gold.


On Thu, 24 Oct 2024 21:39:07 -0400
"Jim Ancona N1ADJ via groups.io" <jim@...> wrote:

I like the battery theory, but I measure 4.1 volts across the battery
terminals with the unit turned on (battery is marked 3.7v) and the device
behaves exactly the same way when plugged into the charger with the battery
disconnected. Neither of those seems consistent with the battery being the
problem.

--

73

-Jim
NU0C

I like the battery theory, but I measure 4.1 volts across the battery
terminals with the unit turned on (battery is marked 3.7v) and the device
behaves exactly the same way when plugged into the charger with the battery
disconnected. Neither of those seems consistent with the battery being the
problem.

Jim

On Thu, Oct 24, 2024 at 9:26?PM Jim Shorney via groups.io <jimNU0C=
[email protected]> wrote:

You battery is likely bad. Lithium based batteries do not like to be deep
discharged. It will kill them. The VNAs have a very small but finite
current drain when powered off and need to be occasionally maintenance
charged if not used for long periods.

On Thu, 24 Oct 2024 07:21:02 -0700
"Jim Ancona N1ADJ via groups.io" <jim@...> wrote:

I've used my NanoVNA-H4 periodically for several years. Yesterday I

charged it, then upgraded the firmware from NanoVNA-H4-SI_20211230 to
NanoVNA-H4-SI_20211230. I re-calibrated and started doing some testing with
it apparently working fine. I got distracted for a few minutes, and when I
checked the screen was black. I powered it off, then back on, but the
display only appeared for a second, then went black.


--

73

-Jim
NU0C

You battery is likely bad. Lithium based batteries do not like to be deep discharged. It will kill them. The VNAs have a very small but finite current drain when powered off and need to be occasionally maintenance charged if not used for long periods.

On Thu, 24 Oct 2024 07:21:02 -0700
"Jim Ancona N1ADJ via groups.io" <jim@...> wrote:

I've used my NanoVNA-H4 periodically for several years. Yesterday I charged it, then upgraded the firmware from NanoVNA-H4-SI_20211230 to NanoVNA-H4-SI_20211230. I re-calibrated and started doing some testing with it apparently working fine. I got distracted for a few minutes, and when I checked the screen was black. I powered it off, then back on, but the display only appeared for a second, then went black.

--

73

-Jim
NU0C

That acts exactly the way I would expect a failed battery to behave, esp. since DFU mode does not eun anything that you flashed . . . Somewhat odd that it won't stay on if plugged in, but the charge circuitry may not provide enough to overcome a failed cell.

--
Sent from my Android device with K-9 Mail. Please excuse my brevity.

I've used my NanoVNA-H4 periodically for several years. Yesterday I charged it, then upgraded the firmware from NanoVNA-H4-SI_20211230 to NanoVNA-H4-SI_20211230. I re-calibrated and started doing some testing with it apparently working fine. I got distracted for a few minutes, and when I checked the screen was black. I powered it off, then back on, but the display only appeared for a second, then went black.

Since then when I turn it on I see a normal display for approximately one second, then it apparently shuts off.

Things I've tried, none of which have made any difference:
* Charging it, including overnight.
* Powering it on while plugged into a charger or USB port.
* Disconnecting the battery for a while, then reconnecting it.
* Powering it from USB with the battery disconnected.

I wanted to try re-flashing old firmware, but it appears to do the same thing in DFU mode. When I power it on while holding the multifunction switch, I see the following in dmesg on Linux, and dfu-util doesn't see it:

[385834.014786] usb 1-3.4: new full-speed USB device number 39 using xhci_hcd
[385834.104077] usb 1-3.4: New USB device found, idVendor=0483, idProduct=df11, bcdDevice=22.00
[385834.104090] usb 1-3.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[385834.104096] usb 1-3.4: Product: STM32 BOOTLOADER
[385834.104101] usb 1-3.4: Manufacturer: STMicroelectronics
[385834.104105] usb 1-3.4: SerialNumber: 205E33642031
[385835.056995] usb 1-3.4: USB disconnect, device number 39

Any suggestions of other things to try?

Thanks,

Jim

R&L form too....

John K0JHL

I second R&L for USA purchasers. They have a very good reputation. I purchased my Ultra from them. My original first run Tiny was purchased direct from Erik's supplier in the days before the vendor list. These days I prefer that all of my money go direct to the vendor rather than giving Amazon a cut. Some of the users in this group can advise on where to get the good VNAs. I got lucky and accidentally bought my early -H from the right eBay vendor before I learned about bad clones.

73

-Jim
NU0C

On Wed, 23 Oct 2024 18:20:17 GMT
"ae1th@... via groups.io" <ae1th@...> wrote:

check out r and l electronics, u wont get a clone, and u can talk via phone if need be.

--

73

-Jim
NU0C

check out r and l electronics, u wont get a clone, and u can talk via phone if need be.

On Wed, Oct 23, 2024 at 10:27 AM, Roy J. Tellason, Sr. wrote:

you have absolutely no guarantee that you'll get a unit from any particular
supplier

That's not my experience - if you order something that is listed from the Aursinc store, you'll get one from Aursinc. Same with other stores on Amazon. But maybe this doesn't happen if an item isn't listed by a store.
But I also got my NanoVNA from R&L - they are a great business to support.

On Tuesday 22 October 2024 12:32:16 pm Karl Henry wrote:

Amazon.com - I recommend this unit based on previous research.

Karl D. Henry, Architect, EIT
KE3IF
286 Arona Road, New Stanton, PA 15672
(724) 493-0531
kdhenry@...

The problem I have with amazon for this is that you have absolutely no guarantee that you'll get a unit from any particular supplier -- they'll ship what they find convenient to ship, so you may get a good one, or you may end up with a clone. For some stuff it doesn't matter but I'd prefer to order from one of the recommended vendors;.

For whatever it's worth, I got mine from R&L.

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Team-SIM SIM-Mode via groups.io
Sent: Tuesday, October 22, 2024 11:47 AM
To: [email protected]
Subject: [nanovna-users] Nano VNA reference with 4'' screen

Hi All

I am looking to get a Nano VNA reference that have 4'' screen and an open source code below 150Euro price

if possible to pointed me to some reference with possible links to the vendors .

Thanks.
73's Nizar

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

Thanks, but that does not really change what I wrote. Best to buy direct from the vendor IMO. The OP did not know about authorized resellers. I already own both Tinys purchased vendor direct. The same goes for the VNAs. Personally I avoid Amazon as a general rule.

On Wed, 23 Oct 2024 02:16:56 -0700
"Clyde Lambert via groups.io" <clyde.lambert@...> wrote:

Jim,
If you check the TinySA group WiKi, you will find TWO approved vendors on Amazon for the TinySA and Ultra or TinySA4.
They are SeeSii and AURSINC.

As far as the NanoVNA H and H4, R&L Electronics, in the US, is highly recommended as well as AURSINC on AMAZON.
I have purchased from all three vendors, and received original versions of TinySAs and NanoVNAs.

Clyde KC7BJE

--

73

-Jim
NU0C

Jim,
If you check the TinySA group WiKi, you will find TWO approved vendors on Amazon for the TinySA and Ultra or TinySA4.
They are SeeSii and AURSINC.

As far as the NanoVNA H and H4, R&L Electronics, in the US, is highly recommended as well as AURSINC on AMAZON.
I have purchased from all three vendors, and received original versions of TinySAs and NanoVNAs.

Clyde KC7BJE

Thank you very much Karl

Do not buy a TinySA on Amazon. You will likely get an inferior clone. Approved seller scan be found in the TinySA Wiki.



On Tue, 22 Oct 2024 10:10:08 -0700
"Matthew Rapaport via groups.io" <quineatal@...> wrote:

Nizar.. these are two different devices with entirely different purposes. Suggest you watch some YouTube videos on both and decide on which you need.. or get both! If you are U.S. based Amazon is a source of both. Don't know about other countries

--

73

-Jim
NU0C

Thanks Stan... I knew there had to be a reason ???