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On 7/8/21 6:07 PM, Larry Rothman wrote:

Anne, please browse the forum's Wiki.
There is alot of info there including the schematics for each revision of nanovna, H and H4.
There also photos of various boards.

ANd if you post a photo, someone might be able to ID it for you.

On Thu., 8 Jul. 2021 at 6:53 p.m., Anne Ranch<anneranch2442@...> wrote: I got brave and removed the cover.
Now I am looking? at PCB with absolutely no identification.

Unauthorized clone or somebody not interested to advertise their work ?

Opened the "git" link and was looking for schematic...
That got me to another "git" site and the only thing I can identify for sure is the
STM32 processor....

I am not sure I should go? to the "trouble" to post? PCB picture here.

For now l? am interested now to "hook up " bluetooth module to my hardware,
if that is even an option.

So I was looking for anything resembling input / output.

And I have I found two pins marked

SWDIO and SWCLK

Any guess what they are ?

Perhaps non customery? designation for "2 wire I/O " - data and clock ?
I do not see any such signals on schematic.

Anne, please browse the forum's Wiki.?
There is alot of info there including the schematics for each revision of nanovna, H and H4.?
There also photos of various boards.?


On Thu., 8 Jul. 2021 at 6:53 p.m., Anne Ranch<anneranch2442@...> wrote: I got brave and removed the cover.
Now I am looking? at PCB with absolutely no identification.

Unauthorized clone or somebody not interested to advertise their work ?

Opened the "git" link and was looking for schematic...
That got me to another "git" site and the only thing I can identify for sure is the
STM32 processor....

I am not sure I should go? to the "trouble" to post? PCB picture here.

For now l? am interested now to "hook up " bluetooth module to my hardware,
if that is even an option.

So I was looking for anything resembling input / output.

And I have I found two pins marked

SWDIO and SWCLK

Any guess what they are ?

Perhaps non customery? designation for "2 wire I/O " - data and clock ?
I do not see any such signals on schematic.

Those are the debug pins. Look elsewhere for the UART port if you have one. May only be available on H4 version.
Gary
W9TD

I got brave and removed the cover.
Now I am looking at PCB with absolutely no identification.

Unauthorized clone or somebody not interested to advertise their work ?

Opened the "git" link and was looking for schematic...
That got me to another "git" site and the only thing I can identify for sure is the
STM32 processor....

I am not sure I should go to the "trouble" to post PCB picture here.

For now l am interested now to "hook up " bluetooth module to my hardware,
if that is even an option.

So I was looking for anything resembling input / output.

And I have I found two pins marked

SWDIO and SWCLK

Any guess what they are ?

Perhaps non customery designation for "2 wire I/O " - data and clock ?
I do not see any such signals on schematic.

Use the touch command to create a new document.

On Thu, Jul 8, 2021 at 11:29 AM Anne Ranch <anneranch2442@...> wrote:

OK, I am too lazy to use commands to get "nanoVNA-saver" running.

Anybody tried the attached procedure to run it as "standard" Linux /
Ubuntu application ?
Little long but seems accurate.








--

*Marshall Harrison, *
*Microsoft rMVP
<>*
*904.655.6502*

Well, as always judged the source too soon
in very few steps it asks to "create new document "
unfortunately the folder has no clue what "document " is - there is
no option to create document.

SimSmith:

Excellent Tutorial:
<>

Dave - W?LEV

--
*Dave - W?LEV*
*Just Let Darwin Work*

OK, I am too lazy to use commands to get "nanoVNA-saver" running.

Anybody tried the attached procedure to run it as "standard" Linux / Ubuntu application ?
Little long but seems accurate.

Use SimSmith.

Anne,

Actually, I'm more interested in determining the matching range of a tuner with various antennas.

I've used the AI1H method** of testing various tuners but that's a static resistance method. With some of my Z-Match tuners the range would seem to be from about 3 to 3k Ohms. But what would it be with an actual complex impedance (conjugate match). The nanoVNA measurement options could provide that info, I think...?

**Frank Witt, AI1H, Articles in QST Apr/May ‘95, Antenna Compendium vol 5, QEX (Sep/Oct ‘03),

--
Chuck, W5USJ

Nice topics Barry

just one small (nitpicking) remark on the wording in
3) Why does every feed line have an SWR of some value at some frequency?

Actually it's not the feedline that has an SWR 'of some value'.
The line has a characteristic impedance (see item 2) )
It's the (mismatched) load that is transformed into something else along the line, causing the SWR.

Also a fun topic : how can a capacitive load suddenly be measured as some inductive impedance elsewhere along the line ? ... call our friend Smith to help.

73,
Luc ON7DQ

From all this discussion - I find it peculiar that I just cannot identify if I have SMD pads or feed-thru without opening it up.

My NanoVNA-H in the plastic housing (delivered in the black gift box with golden letters) has a big sticker on the back telling it has HW version 3.4 (this is the one with serial THT holes on the left on P3 (VDD, TX, RX, GND).
The red wire is my addition to enter dfu mode with pressing the jog on power-on, see Larry's post /g/nanovna-users/message/10026. This allows to enter dfu fast with all kind of SW; the new versions e.g. of DiSlord have also a serial command and a menu entry, but I'm glad that Larry's HW solution works even with broken SW and a bricked device without opening the device and bridging the BOOT0 connector to VDD on P1 :)

now where do all these other therms come from ?
TTL (transistor transistor logic ) ?
UART (universal asynchronous RX TX )
that all looks as hardware "hackers" terminology,
but I thought this is primarily a users group.

These is just hints which voltage levels to use, in the old days (50..30 y ago) computers had serial connections to modems and terminals and all other kind of stuff. These connections (earlier 25pin connectors, later 9pin), also called V24 or RS232, could run over 10..100 m and worked with different voltages for the logical levels because of these long distances:
LOW = +5..+15V, HIGH = -5..-15V (the polarity was also reversed). Be careful not to connect directly to modern electronic!
Contrary "modern" serial connections (e.g. for Arduino & Co) work with "TTL" level, that's simply a common name for the normal logic level inside the device:
LOW = 0V, HIGH = 3.3V (sometimes also 5V tolerant, the "classical" TTL level). These connections work reliable up to 1..5 m only.
And UART is just an acronym for "serial", i.e. sending bits one after the other on one line.
Here, too, TX and RX can lead to confusion, because these designations are meant as seen from the inside: the transmitter outputs its signal at the TX (transmit) output and this line is connected to the RX (receive) input of the receiver and vice versa for duplex.
Typical failure is to "connect by name" (TX-TX and RX-RX), always think of TX->RX and RX<-TX.

I suppose "open hardware" concept ...

That's what I've been doing since I can remember, starting with toys etc. The first thing I do when I get devices like the nano is open them up and take photos - unless the device is glued together. And especially if there are so many bad and ugly clones out there - if I find that, I open a dispute and ask for a refund - because I don't want to honour bad deals based on open source and countless hours of unpaid volunteers. But based on the discussions here and on github and eevblog, I was able to order my latest toys nano and SDR stick from honest shops that even sponsor the developers :)

You may have turned off the calibration.?
Go to the base menu, click calibrate and make sure the Apply button is checked.?


On Wed., 7 Jul. 2021 at 7:44 p.m., Anne Ranch<anneranch2442@...> wrote: Is this normal ?
I have not checked my nano firmware version , got other "honey does"
I am just curious , not panicking , not yet.

On initial power -up
I get splash of white screen
then splash , impossible to read "fine print " too fast , of logo
then the display just goes nuts...
I call it "4th of July (static)? fireworks.

I can access the menus etc....

Is this normal ?
I have not checked my nano firmware version , got other "honey does"
I am just curious , not panicking , not yet.

On initial power -up
I get splash of white screen
then splash , impossible to read "fine print " too fast , of logo
then the display just goes nuts...
I call it "4th of July (static) fireworks.

I can access the menus etc....

Originally I did not see much benefits to put the nano into a box, however, after "reading the mail " here I see a "major" issue with the SMD coax connectors breaking off.
So I am not after making it bulletproof and super mini portable , but if I can convince my teenage grand-kid , owner of 3D printer , to print me suitable enclosure - with the goal to secure the connections...

Now as far as putting the HC module inside - I got no issue soldering wires if necessary , but on first glance there seems to be very little headroom to insert the module. BUT they make bigger spacers and longer screws.

From all this discussion - I find it peculiar that I just cannot identify if I have SMD pads or feed-thru without opening it up.
But it really does not matter - it has to be opened anyway. .

I suppose "open hardware" concept - with multiple clones has its "advantages".

On the newer -H boards (not H4, as DiSlord has shown) there is a simple set of 4 pads in a row with V+, Rx, Tx, and Gnd. This is eaxctly what's required to connect an HC-05/06/... Bluetooth module. Its easy to solder a 4 pin header to these. The pins fit through the pad holes. Old -H boards don't have these pads and that is where you would have seen the "solder a wire here and ...". "older" is back 2+ years ago so there is fair chance you have a new enough nano to have these pads.

On mine I cut a small hole in the case above these pins Connections can be made using "Dupont" wires, or I repurposed on old 4 pin CD/DVD audio cable from bygone years, or you can use a 4 contaact female header. or ... well options abound.

I think the best option is, as Dragan suggests, to connect the dongle only when needed. You could put it in a small plastic box if you want or just leave it bare (or in a shrink wrap tube as many of these modules seem to be).

Unfortunately, if that still seems too daunting I'm afraid you may be out of luck. This is simple enough to do and works well enough that it probably satisfies many who desire BT support. Its not an elegant solution but its OK and probably means that nano vendors have little incentive to add this as the market is small.

Maybe someone could offer a case that allows for the BT module? Maybe even 3D printed?

That isn't a problem with Linux.

I remember wbw a 100 foot piece of -48V 500 MCM being modeled as R+jinductance and C to trough. We were wondering what impulse it would take to raise -48V to 0. Turned out a disgruntled employee was pulling the fuse. KISS

I did just that on my 2.8" nano but a better idea is
to add a header and connect the BT dongle when
needed.

On Wed, 7 Jul 2021 at 19:00, Torbj?rn Toreson <torbjorn.toreson@...>
wrote:

Hello Dislord,

Is it possible to install the HC-05 or HC-06 bent down inside the NanoVNA
H4-casing? Or will that disturb the Nano?

73/SM6AYM

7 juli 2021 kl. 18:13 skrev DiSlord <dislordlive@...>:

NanoVNA-H/H4 contain free pins named as Rx and Tx (you can see pcb or

scheme)

Exist connection modules like
HC-05 or HC-06

It allow easy connect any device vs UART port over Bluetooth, device

need only receive commands from UART port and answer to it

Need only configure module and connect to PC, and use any software as on

USB connection

<H4.jpg><hc-06.jpg>

Hello Dislord,

Is it possible to install the HC-05 or HC-06 bent down inside the NanoVNA H4-casing? Or will that disturb the Nano?

73/SM6AYM