Re: Replacement of damaged NanoVNA circuit board
#hardware
If you measure capacitance between the AC cord to the Iron tip, you get about 200 pf.
The AC voltage is capacitively coupled to the Iron tip unless you have a specially grounded IRON,(And have the Ground Connected)
So the average soldering iron is a 200 pf cap plugged into 120 VAC going to your circuit.? Kent
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On Sunday, October 2, 2022 at 05:33:28 PM CDT, <linhz0hz@...> wrote:
I am interested if anyone figured this out, because I just fried mine nanoVNA SAA-2N just now. -_-!
I was building some homebrew amplifier. Before measuring that, I wanted to calibrate the test PCB before I put in my transistor. So I would solder different resistors on the board and take measurement. The board is not powered (completely passive).
It was tedious, I got lazy and did not remove my nanoVNA while I solder. I had DC-blocking capacitors though and I got away doing that a few times before so I imagined it would be fine.
But apparently it is not fine this time. Now if I just connect Tx to Rx port, I got high reflection (close to an open) and only -20dB transmission. Software part seems to work still, so I suspect RF front end was killed. I open the casing and took a look, but I don't want to make a rush decision and break it further. Also those EMI shields looks hard to remove.
So does anyone have advice for me on what is the most efficient way to repair? And do you expect a soldering iron to have damage like this (I still don't fully believe it!) or is this something else?
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Re: Replacement of damaged NanoVNA circuit board
#hardware
maybe a spike killed the first switching chip (those are well known to burn up)
dg9bfc sigi
Am 02.10.2022 um 17:24 schrieb linhz0hz@...:
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I am interested if anyone figured this out, because I just fried mine nanoVNA SAA-2N just now. -_-!
I was building some homebrew amplifier. Before measuring that, I wanted to calibrate the test PCB before I put in my transistor. So I would solder different resistors on the board and take measurement. The board is not powered (completely passive).
It was tedious, I got lazy and did not remove my nanoVNA while I solder. I had DC-blocking capacitors though and I got away doing that a few times before so I imagined it would be fine.
But apparently it is not fine this time. Now if I just connect Tx to Rx port, I got high reflection (close to an open) and only -20dB transmission. Software part seems to work still, so I suspect RF front end was killed. I open the casing and took a look, but I don't want to make a rush decision and break it further. Also those EMI shields looks hard to remove.
So does anyone have advice for me on what is the most efficient way to repair? And do you expect a soldering iron to have damage like this (I still don't fully believe it!) or is this something else?
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Re: Advice on which FW to load SAA-2N v2_2
dont shoot on me if you break it ... grin
dg9bfc sigi
Am 02.10.2022 um 19:17 schrieb Danny K5CG:
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Now look what you've done Siegfried. Now I'm going to have to try that.
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Re: Replacement of damaged NanoVNA circuit board
#hardware
I am interested if anyone figured this out, because I just fried mine nanoVNA SAA-2N just now. -_-!
I was building some homebrew amplifier. Before measuring that, I wanted to calibrate the test PCB before I put in my transistor. So I would solder different resistors on the board and take measurement. The board is not powered (completely passive).
It was tedious, I got lazy and did not remove my nanoVNA while I solder. I had DC-blocking capacitors though and I got away doing that a few times before so I imagined it would be fine.
But apparently it is not fine this time. Now if I just connect Tx to Rx port, I got high reflection (close to an open) and only -20dB transmission. Software part seems to work still, so I suspect RF front end was killed. I open the casing and took a look, but I don't want to make a rush decision and break it further. Also those EMI shields looks hard to remove.
So does anyone have advice for me on what is the most efficient way to repair? And do you expect a soldering iron to have damage like this (I still don't fully believe it!) or is this something else?
|
Re: Advice on which FW to load SAA-2N v2_2
Now look what you've done Siegfried. Now I'm going to have to try that.
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Hi, in using a nanovna H4 , WIN 10 64bit , 16G ram
I could not get the program to run at all, ive downloaded the 32bit version and it runs fine, however takes a good many secs to load up.
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Re: NanoVNA-h4 stuck in DFU mode
If you dont mind using CMD Line Interface, try dfu-util to install firmware. See to install. Real easy to use once you have .dfu file downloaded go to Terminal/CLI and type command: dfu-util -a 0 -D <full pathname of .dfu file> I'm on a MAC so no driver needed. See Bill Cody message #16933 working Windows driver: Paul
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Re: New member with a NanoVna H4
Hello, I use Nano Solver with Lite64 end Nanovna V2 with PC. I find very useful John Smith software, however the work of Dislord FW is great to use standalone. *Sent:* Friday, September 30, 2022 at 7:43 PM *From:* "Stan Dye" <standye@...> *To:* [email protected]*Subject:* Re: [nanovna-users] New member with a NanoVna H4 That is a reasonably recent firmware version - it should work fine for your intended use case. There are a few added features in the latest release version of firmware from DiSlord (ver 1.2.00) - mostly for direct use of the device without a computer, so these may not be of great interest to you. Stan On Fri, Sep 30, 2022 at 11:28 AM Pete Harrison <rockfisher@...> wrote: Hi all, Ive had my H4 a month now and love it. Im not new to VNA's as use
a Agilent one at work occasionally.
I still cant believe how so much is packed into a small box for such a
brilliant price. Well done to all developers.
My question is , Would it be beneficial to upgrade the firmware? , Plan is
to use it with Joel smiths solver software if i can. (would love to see his
Labview worksheets, but understand his time and effort into it) labview can
be difficult at times, although im used to doing stuff with HPIB with it.
My H4 is as follows :-
version 1.1.01
HW version 4.3 MS
Thanks for letting me join this group, i look forward to any replies and
if i can help others i surely will.
Regards Pete
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Re: New member with a NanoVna H4
Best is to carefully read the "Absolute Beginners Guide to the NanoVNA"
which can be found in the files area of this group.
Some older firmware update files are also uploaded in the files section,
but for the most recent ones, go to the Dislord or hugen github
repositories - you can find links to them in the firmware topic of this
group's wiki. The wiki has lots of good info.
StN
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On Sat, Oct 1, 2022, 7:29 AM Bryan Curl <bc3910@...> wrote: Greetings,
Also relatively new to H4 and this group. Where does one locate firmware,
release notes and upgrade/downgrade instruction?
Thanks,
Bryan
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Re: New member with a NanoVna H4
Greetings,
Also relatively new to H4 and this group. Where does one locate firmware, release notes and upgrade/downgrade instruction?
Thanks,
Bryan
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Re: Advice on which FW to load SAA-2N v2_2
maybe you can add it...
if i remember right the space on the pcb is there ... add a socket and hack a slit in the case
dg9bfc sigi
Am 30.09.2022 um 21:28 schrieb Damon:
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I run the DiSLord fw as well. I just wish my Saa-2n had an sd card socket.
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It¡¯s fun when you bridge a lightbulb across it.
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Re: Advice on which FW to load SAA-2N v2_2
I run the DiSLord fw as well. I just wish my Saa-2n had an sd card socket.
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Re: Advice on which FW to load SAA-2N v2_2
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Re: New member with a NanoVna H4
You can always revert back to old firmware if the new one is not to your liking.
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On Fri, 30 Sept 2022 at 20:28, Pete Harrison <rockfisher@...> wrote:
Hi all, Ive had my H4 a month now and love it. Im not new to VNA's as use a Agilent one at work occasionally.
I still cant believe how so much is packed into a small box for such a brilliant price. Well done to all developers.
My question is , Would it be beneficial to upgrade the firmware? , Plan is to use it with Joel smiths solver software if i can. (would love to see his Labview worksheets, but understand his time and effort into it) labview can be difficult at times, although im used to doing stuff with HPIB with it.
My H4 is as follows :-
version 1.1.01
HW version 4.3 MS
Thanks for letting me join this group, i look forward to any replies and if i can help others i surely will.
Regards Pete
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Re: New member with a NanoVna H4
That is a reasonably recent firmware version - it should work fine for your intended use case. There are a few added features in the latest release version of firmware from DiSlord (ver 1.2.00) - mostly for direct use of the device without a computer, so these may not be of great interest to you. Stan On Fri, Sep 30, 2022 at 11:28 AM Pete Harrison <rockfisher@...> wrote: Hi all, Ive had my H4 a month now and love it. Im not new to VNA's as use
a Agilent one at work occasionally.
I still cant believe how so much is packed into a small box for such a
brilliant price. Well done to all developers.
My question is , Would it be beneficial to upgrade the firmware? , Plan is
to use it with Joel smiths solver software if i can. (would love to see his
Labview worksheets, but understand his time and effort into it) labview can
be difficult at times, although im used to doing stuff with HPIB with it.
My H4 is as follows :-
version 1.1.01
HW version 4.3 MS
Thanks for letting me join this group, i look forward to any replies and
if i can help others i surely will.
Regards Pete
|
New member with a NanoVna H4
Hi all, Ive had my H4 a month now and love it. Im not new to VNA's as use a Agilent one at work occasionally.
I still cant believe how so much is packed into a small box for such a brilliant price. Well done to all developers.
My question is , Would it be beneficial to upgrade the firmware? , Plan is to use it with Joel smiths solver software if i can. (would love to see his Labview worksheets, but understand his time and effort into it) labview can be difficult at times, although im used to doing stuff with HPIB with it.
My H4 is as follows :-
version 1.1.01
HW version 4.3 MS
Thanks for letting me join this group, i look forward to any replies and if i can help others i surely will.
Regards Pete
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he does it to me even without a lid 73'ss Claudio
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perhaps the case is pressing against the display too much, try loosening the screws a bit.
73 Ton
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Re: Advice on which FW to load SAA-2N v2_2
I have a SAA-2N v2_2 with DiSlord v1.3.09 firmware. It is working with Saver 0.5.3.
As Sigi cautioned, no mot place too much force on the N to SMA adapters.
Mike N2MS
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On 09/24/2022 3:33 AM tuckvk3cca <tuckvk3cca@...> wrote:
I have the same model. Nice gear, I like the N connectors and solid build. Runs with Dislord and QT but does not like Saver. Driver conflict.
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Danny K5CG
Francesco