Re: #firmware NanoVNA SAA-2N firmware not loading
#firmware
Hi Tim, brevity did the trick, I was able to get back to life using the left jog and on-off switch. The SAA-2N showed up on the -QT software (on my MacBookPro) and got the prompt to load software. Went ahead, but not sure now which download I loaded.... On the Version screen I see NanoVNA-V2-firmware and a build time of 4/3/22, 13:30:34.
Thks for your encouragement, but now I hope I got the right firmware, I hope it is not too new for a two or three year old SAA-2N. Now let's see what happens!
72/73 de k1qed, bob.c qrp 4evr!
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I guess I need to express my gratitude for allowing me to ACCESS the forum, again.
I am still looking for any text form of "menu" symbols AKA "menu dictionary".
( No, I do not desire to be "part of solution" have few "honey does" of higher priority. )
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Still OK Neil
Colin MM5AGM
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Wow, touchy, ta, ta.
Mike C.
PS I didn't know engines had ears!!
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On 6/8/2022 7:32 PM, Anne Ranch wrote: Let me restate - I have been actively using nanoVNA for about two weeks -
and I am a certified engineer and real engineers do not read manuals...
Consequently I make mistakes , because I only read
what I IMMEDIATELY need...
With that said - I find the wast variety of "menu flowcharts " .
disgusting.
It looks as the primary goal was to cram everything in minimal space...
What happen to real (IBM) style flowcharts ?
GUI ( graphical USER interface ) Pitiful.
Any nanoVNA " coders " ever hear about "tool tips " ?
How about " document header(s) " levels?
In my years of gainful employment I did "(graphical) user experience " quality control...
(some "coders" did not like me ...)
and if anybody is going to say " what do you expect for free ..."
I AM DONE HERE
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Re: #firmware NanoVNA SAA-2N firmware not loading
#firmware
DFU mode does nothing with the screen . . . Perform the steps to enter it (DFU mode) on your unit, and see if it shows up on USB.
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On June 9, 2022 8:39:24 PM CDT, Robert Coleman <rcoleman@...> wrote: Hi Tim, I would like to get to any mode, but the device does not respond to any input, button or tap. The screen is white and nothing gets a reaction. bob.c
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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Re: #firmware NanoVNA SAA-2N firmware not loading
#firmware
Hi Tim, I would like to get to any mode, but the device does not respond to any input, button or tap. The screen is white and nothing gets a reaction. bob.c
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On Thu, Jun 9, 2022 at 03:17 PM, Fred Moore wrote:
Just out of curiosity, is the processor type listed on a display rather
than opening up the unit and looking at the chip?
Yes it is listed under Platform after you enter Config-Version. What I don't know if that is the actual chip on the board or what the developer of the firmware just entered as default text for that field. Perhaps DiSlord can comment since he created that display page.. Roger
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Just out of curiosity, is the processor type listed on a display rather than opening up the unit and looking at the chip? On Thu, Jun 9, 2022 at 5:15 PM Roger Need via groups.io <sailtamarack= [email protected]> wrote: According to Hugen (manufacturer of -H4) the latest firmware can run on a
STM32F302CCT6.
/g/nanovna-users/message/24748
Comparison chart >>
Roger
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measuring T equivalent circuit of an antenna
Hello all of you,
I was wondering if someone measured the T equivalent circuit of an antenna?
So the antenna is seen as having three ports: two going to the two points
of say a dipole and the third port going to the Earth.
G3TXQ is using such a T equivalent circuit in his article (but no values):
(Drawing 2).
There is an article that described the derivation of these three
impedances:
I did this for my 40m OCFD antenna anc a 200 *¦¸* load on a balun and a
transmission line. I got these results:
I was wondering if other people did similar and have got some
(similar/different) results to share. I am not sure if I indeed measure the
correct thing...
*Advice or feedback on these measurements are welcome?** Thanks.*
*All the best,*
*Victor*
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Re: How to make nanoVNA "bulletproof" ?
Sigi,
My cupboard yielded exactly 1 suitable box but, in the event, having a bigger format gets away from the "little and fiddly" form of the nano, as well as accommodating the nice R&S flex patch cables I found.
Yes, by all means select the bulkhead adapters according to need. With a bit of Dremel work I think I could have included a third set of connectors but there was no need in my application.
Doug: re pictures: I see a thumbnail with my first post. Click for a larger image.
73, Peter.
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Re: How to make nanoVNA "bulletproof" ?
A photo please.
Doug
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On 09/06/2022 09:26, K8HTB wrote: I cut a piece of 1/4 inch plexiglass about 9 inches x 6 put Velcro on the nanovna and cables . It keeps the cables from damaging the connectors. De K8HTB
-- */If you forward this email, please delete the forwarding history which also includes my email address. When sending emails, please BCC so as to hide all addresses. Thanks for helping to prevent Scammers and Spammers from mining addresses and spreading viruses./ Doug Kearney * *Ottawa, ON *
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Hi Colin, is your NanoVNA still working okay?
I ask because the one i have (bought off ebay a while ago i think) has now got lines all over the screen and is barely readable.
Thanks
Neil
M7SVH
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Re: How to make nanoVNA "bulletproof" ?
Nice job.... But i would bot use pl sockets but n sockets cause with v2 plus4 or saa2n i measure also on 13cm...
Even at 70cm the n socket is better as pl...
Your case is so big it should be easy to add a bigger sized battery... Grin
Greetz
Dg9bfc sigi
Am 09.06.2022 16:54 schrieb Siegfried.Jackstien@...:
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Add sma to n adaptors...can or better should be with flange (others with
big nut may work also) ... Screw flange on a sheet metal angled 90 degrees
to form end and base plate...
And then use thicker cables with n connectors like i also use on my saa2n
.... Ok you then need new calibration set with n connectors.. But that all
will be more robust as using those flimsy sma..
If you stay on sma then i recommend to use sma extender (male female
adaptor).... So if worn out you can replace that extender
Both will make it more robust...
Either n sockets....
Or sma extender... So if worn out... Easy to replace
I prefer n socket in most cases... But i have both cause i own an saa2n
and a v2plus4... Both with modded fw from dislord :-)
Dg9bfc sigi
Am 09.06.2022 15:30 schrieb Anne Ranch <anneranch2442@...>:
Excellent idea - combine "rotator plate" ( for stability ) with superglue
and Velcro !
I actually was not looking to? buy those tiny screws to permanently mount
the device onto the plate ...
Vaclav AA7EJ
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Re: How to make nanoVNA "bulletproof" ?
Add sma to n adaptors...can or better should be with flange (others with big nut may work also) ... Screw flange on a sheet metal angled 90 degrees to form end and base plate... And then use thicker cables with n connectors like i also use on my saa2n .... Ok you then need new calibration set with n connectors.. But that all will be more robust as using those flimsy sma.. If you stay on sma then i recommend to use sma extender (male female adaptor).... So if worn out you can replace that extender Both will make it more robust... Either n sockets.... Or sma extender... So if worn out... Easy to replace I prefer n socket in most cases... But i have both cause i own an saa2n and a v2plus4... Both with modded fw from dislord :-) Dg9bfc sigi Am 09.06.2022 15:30 schrieb Anne Ranch <anneranch2442@...>:
Excellent idea - combine "rotator plate" ( for stability ) with superglue
and Velcro !
I actually was not looking to? buy those tiny screws to permanently mount
the device onto the plate ...
Vaclav AA7EJ
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Re: How to make nanoVNA "bulletproof" ?
Anne,
I realize this is a bit different to the approach you're thinking about but maybe it's of some interest. I "re-packaged" my nanoVNA-F to address some of the issues you mention, and to provide some "saver" connectors. Although the nanoVNA is essentially a disposable item I decided to give it the best chance possible at a long and consistent measurement life; I've attached a picture to show the general idea.
The plastic instrument box is spare from another project and I hinged the lid using hardware store small cabinet hinges. The VNA is mounted using velcro and the bulkhead adapters and patch leads came from the junk box or eBay. I often use the unit in the field with a laptop, most recently for some LF/MF antenna work. Although probably unnecessary in the portable setup I did, as a matter of practice, include a small toroid choke (type 77 material) for the USB lead. Finally, I couldn't function without a decent stylus when using the VNA stand-alone.
All of my external systems under test have PL259 or SMA connectors, hence the choice of bulkhead adapters.
Best regards,
Peter.
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Re: How to make nanoVNA "bulletproof" ?
Excellent idea - combine "rotator plate" ( for stability ) with superglue and Velcro !
I actually was not looking to buy those tiny screws to permanently mount the device onto the plate ...
Vaclav AA7EJ
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Re: How to make nanoVNA "bulletproof" ?
I cut a piece of 1/4 inch plexiglass about 9 inches x 6 put Velcro on the nanovna and cables . It keeps the cables from damaging the connectors. De K8HTB
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Re: How to make nanoVNA "bulletproof" ?
I have been using VNAs at work since the '80s. Professional "box" VNAs have extensive internal power supply and data line decoupling/shielding and are designed as a system with their PC/controllers/display, all housed in a heavy metal EMI-shielded enclosure where all ingresses are carefully filtered, with a chassis grounded via power cord.
The pro USB-based VNAs (Copper Mountain make outstanding units) usually come in a stout shielded housing and generally have a ferrite (or one on each end) molded into the provided heavy and presumably well-shielded USB cable and the user is cautioned to use that cable only.
Quite a different situation from an inexpensive handheld device which communicates with and is powered by a skinny $1cable that doubles as a dandy RF pickup antenna going into a random poorly-grounded or ungrounded laptop or charger with unknown USB power quality. So it is not unreasonable to expect to have to do some RF decoupling work when using these amazing little instruments, especially when measuring antennas.
They may have their issues but just step back and think of what your $50 or $100 buys; they can do 95% of the work that the multi-$100K Keysight ones do.
73, Don N2VGU
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Re: How to make nanoVNA "bulletproof" ?
On 6/8/22 9:58 PM, Martin Glazer wrote: For the professional VNA analysers, Do they put atorroid chokes on those?
I was wondering. That would depend on the test setup.? Most people, when measuring an antenna, use chokes and/or baluns at various points. In a anechoic chamber situation, like when doing a near field scan (which uses a VNA as the measurement instrument) you'd make sure the feed lines are not coupled to the antenna, and chokes are a typical way to do that. In the field, with something like a Keysight Fieldfox, it kind of depends. If I'm measuring a dish antenna and its feedlines, I might not use any choke at the VNA - the feedline is sufficiently decoupled.? Measuring something like a dipole, you bet I'd use a bunch of toroids and clamp on ferrites. What you typically do is make the measurement without, then add some and see if it changes. If it changed, then try adding some more and see if it changes again. In extreme cases, one goes to remote or programmed operation and putting the test equipment in a box with a small computer to drive it. Right now, I'm trying to figure out how to measure the 4 port impedance of a pair of deployable dipoles, and shoehorn everything into a metal box that represents the structure to which the dipole is attached.
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Colin Campbell
Mike C.
Roger Need
Peter Hall, VK6HP/VK6MJM
Donald S Brant Jr