¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
Date

Re: Nanovna-H4, looking for a case this will fit in.

 

Harbor Freight sells a small case like that as well...

73, and thanks,
Dave (NK7Z)

ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 1/16/22 05:53, Dale - 2W0ODS wrote:
I bought a MAX002S IP67 case from Amazon last night and it turned up this morning.
It's absolutely perfect for my use and is waterproof too.
Everything I need fits in, I've put the USB-C to USB-C cable in the back with the SMA-SMA leads and I have the calibration pieces in a little bag
too.
The foam is to cut out as it consists of little squares joined together, I've left one row to the left of the Nanovna as I will fit some SMA-M - SMA-F to save wear on the main SMA sockets and then I will remove a cube of foam by each SMA socket.


Re: Nanovna-H4, looking for a case this will fit in.

 

The following is a copy of my post of 30th August 2021 which illustrates my solution to the enclosure/connector issues:

The attached pictures show my solution to the SMA issue.

1) BNCs match all my other test gear removing the need for adapters
when interfacing.Indeed BNCs are the standard connector used for
professional test gear up to a few, GHz. (Perhaps 10GHz - Have to
check that).
2) Any risk of straining the SMA attachment point to the PCB is
eliminated.
3) The additional weight of the enclosure reduces the risk of the
nanoVNA being dragged off the workbench by the attached cables.
4) The aluminium enclosure adds a measure of screening - probably a
marginal. benefit.
5) The number of connection cycles permissible with BNCs while not
infinite, is far, far greater than the the very small number of
connection cycles specified for SMAs (in the hundreds if I remember
correctly).

The enclosure is made from extruded aluminium "U" section, readily available from eBay, with suitable apertures cut. I'm not sure that the reference planes for the BNC calibration pieces are perfect, but empirically, the results are the same as those obtained with the calibration devices supplied with the nanoVNA.

Michael. (GW7BBY/GB2MOP).

On 30/08/2021 04:25, Jim Lux wrote:
On 8/29/21 7:22 PM, scottad5u1@... wrote:
My day job involves these connectors and others.? Many of my microwave connections use SMA.? I have discovered a few interesting things.
?? 1.? Manufacturers (and I) have been able to determine over-torque damage to connectors and have had to have them replaced (at great expense of course).? If they decide my connectors were damaged due to over-tightening, they void the warranty for the repair...
?? 2.? On both my ham gear and work gear, all those connectors seem to come loose - even when I have used "maximum finger force".? This seems to happen over a few months' time, even in the environmentally-controlled equipment buildings.? I assume it is some kind of temperature related thing caused by the very minor temperature differences in the buildings.? This is consistent with my co-worker's observations as well.? We've been with the company 7 1/2 years so far.? We use the torque wrenches to prevent this.
?? 3.? I have and seriously use my torque wrench for work.? I also have one for my "ham use".? I have too many times that I've repaired friends' handi-talkies with damaged connectors or ones that have been broken loose from the PCB.? I have gotten way too good at it.
?? 4.? I have observed differences when testing with the fancy $35,000 work analyzer on SMA connections as tight as I can get them with fingers compared to "torqued" connections.? The "torqued" connections were always testing better - how much better was from a little to a surprising amount of improvement.
This is totally the case.? Maybe you won't see it at 10MHz (but you might), but above 1 GHz, for sure. It's the "consistency" not the "mating force"



A quick search for "sma connector torque wrench" found a variety for around $25us.

Summary:
I recommend using a suitable torque wrench for SMA connectors to maximize connector life and assure maximum performance of connections.? It also helps prevent damage due to accidental over tightening with a regular wrench.
It's easy to overtorque, even if you've used a torque wrench a lot, and you have "calibrated finger tips"



I typically use 6" coax jumpers of quality coax and connectors on my test gear and "calibrate them out".? I virtually never use a non-pigtail adapter.? I also use pigtails for connections to my HT's (such as to a mag-mount on the vehicle roof).? And I use pigtails on my RTL-SDR units as well.? The pigtails assure minimum stress on my devices' connectors and minimize how many times I have to re-make up the SMA connections.
I do the same. SMA to UHF, SMA to BNC, SMA to N. Keeps from ripping the connectors off the board when something gets bumped.








Re: Metalising plastic cases (Re: [nanovna-users] JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz)

 

On Sat, Jan 15, 2022 at 11:51 PM, Roland Turner wrote:


If it's good enough to be an antenna conductor, it's almost certainly
good enough for EMI shielding.
I disagree with that blanket statement. The requirements and performance measurements are very different. There are a lot of variable, but for example, a surface that reflects 90% and transmits 10% of incident radiation might work very well as an antenna but very poorly as a shield.


Re: Nanovna-H4, looking for a case this will fit in.

 

I bought a MAX002S IP67 case from Amazon last night and it turned up this morning.
It's absolutely perfect for my use and is waterproof too.

Everything I need fits in, I've put the USB-C to USB-C cable in the back with the SMA-SMA leads and I have the calibration pieces in a little bag
too.

The foam is to cut out as it consists of little squares joined together, I've left one row to the left of the Nanovna as I will fit some SMA-M - SMA-F to save wear on the main SMA sockets and then I will remove a cube of foam by each SMA socket.


Re: NanoVNA Saver Markers Disappeared

 

The marker data on the left does update correctly. I am unable to see the markers in the chart windows.

Ed


NanoVNA Saver Markers Disappeared

 

Hello all...
I'm not sure this is the right place to ask this, but did not find any other.
I downloaded the new version (0.3.10) and I no longer have the markers in the chart windows. Version 0.3.9 works fine. Any ideas what I did wrong?
NanoVNA H4
Windows 10 64 bit
Thank you.

Ed


Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

MIL-SPEC is applied to an item that meets or exceeds the Milatary specifications that is effect for that product being made.
The Company I worked for built products for the military. Power supplies for Amram, HV power suppies for several Headsup displays on Milatary Jets and Subs, as well as power converters and magnetics for most every Air plane manufacturer in the Free World.
Retired Electronics Manufactureing Engineer of 35 years at OECO LLC, Milwaukie, Oregon
Clyde Lambert KC7BJE


Metalising plastic cases (Re: [nanovna-users] JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz)

 

On 15/1/22 23:47, 2sheds wrote:

I like the Al case, but as somebody mentioned, it likely doesn't justify doubling the price.
When will affordable metal 3D printers be available?
I guess there are work-arounds for EMI shielding that accomplish what we need.
The Sep/Oct 2016 issue of QEX contains an article on metalising the surfaces of 3D-printed plastic microwave horn antennas, the problem being working with curved shapes to improve performance over the more conventional (cheaper...) flat-surface designs that could be made with copper or brass sheet. The authors used MG Chemicals 843-340G Super Shield Silver Coated Copper Conductive Coating <> which can be obtained inexpensively from the usual electronics suppliers. The like-for-like results at 10 GHz (i.e. 3D-printing a test design using flat surfaces) were comparable to the use of foil or solid metal.

If it's good enough to be an antenna conductor, it's almost certainly good enough for EMI shielding. Note that one of the problems that the authors had was gaps in the horn and its coupler enough to see light through, which naturally leaked microwave. A complete seal might be the harder problem.

- Roland 9V1RT


Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

On 1/15/22 4:43 PM, Jeff Green wrote:
Posted from a Wendy's in Bardstown (it sucks).

Sorry for the false lead. As a commercial operation we bought a lot of the stuff.

There are other spray on emi shielding materials, I called our former ee and she told me the nickle based sprays are affordable and work pretty well. she also suggested tracking down real thin from a model store. Some is so as thing as tissue and can be formed by pressing in place, remove, use 3m spray adhesive which is available at loses, we used some to repair a section of wallpaper.
copper foil tape is readily available, has a conductive adhesive, and works quite well. It's available in a variety of widths.

Thin copper foil is also available - it's used by people making electric guitars and similar.? Some Scotch 77 or 74 spray adhesive and it's not coming off very easily.

The shielding effectiveness is tricky to estimate. Most leakage is from wires that penetrate the shielding (so your USB cable). Second would be leakage through slits or gaps in the shielding - you need the perimeter of the hole to be << 1/2 wavelength, so at HF, that's pretty easy.

At HF, the challenge is skin depth. The shielding needs to be > 5 skin depths.

Skin depth in copper at 1 MHz is about 2.5 mils (0.0025 inches, 64 microns), so your shield would need to be 12 mils thick, which is a lot of 1 mil thick tape.? On the other hand, 0.032 aluminum (20 ga) is pretty good.

is your friend.


One also needs to worry about magnetic fields, for which lossy ferrite material in an elastomer are useful.



When we get to our new home, and get set up, I'll try to find some spray on shielding available to the common man. Or former ee is in a move to Texas and will be really busy with a start up but will try to find an available spray.

I know nothing about 3D printers, so.....
Can you print with carbon laced plastic?
Is there conductive plastic for printing?

I had a moment to do a search (ever travel with 3 women?) and found this:

I have no idea if it's effective, others will have to make that judgement.






Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

According to: the product is NOT available to the normal consumer, if I read the ad correctly.

Mike C.

On 1/15/2022 3:25 PM, Jeff Green wrote:
Posted on the road.
Traffic is a nightmare.
Try these links:

[This is the product we used.]



Create a throwaway email to register, if that fails, let me know and I'll use my account to download them and put them in the files section.

I am (or was) the Q/C engineer but I do not have a good grasp on emi control. I had to surrender all my work documentation and I don't trust my memory to quote actual attenuation figures.




Re: semi automatic quartz measuring

 

In my opinion there is no problem with sweeping 'couse I think about selecting crystals for filter (only) so initial frequency is known with high accuracy.
Dislord - is that possible to "ask" nanovna from PC (firnware with crystal measuring feature) for send crystal parameters to PC or is it impossible without modyfying firmware?
mrn


Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

Very interesting, but the nauseating company advert that the link goes to, (which would have irritated a 3yr old child), gave NO INFORMATION ON THE ACTUAL RF SUPPRESSION, EITHER MAGNITUDE OR FREQUENCY, regarding the rf suppression their products might provide.

Yours, irritated, Steve L, G7PSZ


Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

Exactly¡­. Just like ¡®military grade¡¯ translates to ¡®made by the lowest bidder¡¯. :)

"Silence is golden. Duct tape is silver."

On Jan 15, 2022, at 10:47, 2sheds <2sheds@...> wrote:

?It's kinda like saying something is "Mil-SPEC". What does that mean?
I worked in a private company that did lot/most of its work for US Gov customers and you get used to those claims and others similar in nature. Since my final job before retiring was running a qualification review board of completed systems/subsystems for aerospace payloads i am especially sensitive when performing the final review to include extensive audits of parts, materials and processes to the point of on-site surveillance and complete parts audits. It is outrageously expensive but necessary when ultimately installed in something that will be beyond repair once in orbit.
I don't need or want that in my nanovna and can usually do my own verification/validations to the extent required.
I like the Al case, but as somebody mentioned, it likely doesn't justify doubling the price.
When will affordable metal 3D printers be available?
I guess there are work-arounds for EMI shielding that accomplish what we need.





Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

It's kinda like saying something is "Mil-SPEC". What does that mean?
I worked in a private company that did lot/most of its work for US Gov customers and you get used to those claims and others similar in nature. Since my final job before retiring was running a qualification review board of completed systems/subsystems for aerospace payloads i am especially sensitive when performing the final review to include extensive audits of parts, materials and processes to the point of on-site surveillance and complete parts audits. It is outrageously expensive but necessary when ultimately installed in something that will be beyond repair once in orbit.
I don't need or want that in my nanovna and can usually do my own verification/validations to the extent required.
I like the Al case, but as somebody mentioned, it likely doesn't justify doubling the price.
When will affordable metal 3D printers be available?
I guess there are work-arounds for EMI shielding that accomplish what we need.


Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

"China does not play by the rules of the rest of the world. "
And the USA does?
Someone once stated that USA will newer be a dictatorship as
there is no need, you are propagandised to such an extent that
it would be counter productive.

On Sat, 15 Jan 2022 at 00:26, W0LEV <davearea51a@...> wrote:

Yep. China does not play by the rules of the rest of the world. Their
people are generally good. But the government is crooked as
.......well.......you fill in the missing word. Anything and everything to
better the "state". Follow the leader blindly off a cliff and don't ask
questions.

Working regulatory on the EMC/RFI side, the last 25 to 30 years, I watched
China, single handedly, convince the world markets it was all right to
cheap at testing and approvals and that your exposure just did not justify
the expense of doing things correctly and legally. They set the bar for
blatant cheating with the 'more-or-less" proper marks (never "quite"
correct) with absolutely no backing behind them. Now, even some major US
companies weigh their exposure in the marketplace and follow China's
example. Again, where the dickens is our FCC??!!!!! China these days
fully realizes that CFR 47 (the FCC) is not worth the paper it's printed
on.

Dave - W?LEV

On Fri, Jan 14, 2022 at 10:45 PM Jeff Green <Jeff.L.Green1970@...>
wrote:

Check out this:

,mark%20and%20is%20considered%20fake
.

The place I used to work got burned big time by "China Export" and
"Conformit¨¦ Europ¨¦ene."





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






Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

My apologies, I missed the (now glaringly obvious) markings on the case.

I was referring to more modest "Guaranteed quality: CE, FCC and RoHS compliance". claim, for whatever value such a claim has.

- Roland 9V1RT

------------------------------------------------------------------------

On 15/1/22 02:49, W0LEV wrote:
They certainly do "claim" FCC and CE (the EU) approval by the presence of
their respective regulatory symbols. This image grabbed from their site:
[image: image.png]
Note the extreme right corner. The first symbol, the stylized "CE" is the
mark of the European Union for EMC and safety approval. The stylized "FCC"
is the mark required by our very own FCC. The presence of both should
represent testing an approval by the appropriate agencies. At least that's
the way it works in the rest of the world, except China.

A short time ago and lasting for almont 3-years, China was trying to
convince the rest of the world that the "CE" stood for "China
Export"......... N O T........!!!!!

Dave - W?LEV

On Thu, Jan 13, 2022 at 11:07 PM Roland Turner via groups.io <roland=
[email protected]> wrote:

At the risk of sinking an otherwise entertaining insult, they do not in
fact claim FCC approval. The lack of filings is therefore not relevant.

(Their claim of compliance with FCC standards may well be false, and it
would of course cost rather more than the device does to prove it so,
sure, the usual care about compliance claims is warranted. Presumably a
prospective customer could simply enquire about supporting documentation
for that claim and, in its absence, initiate Seeed's process for dealing
with counterfeit products and false claims in listings.)

- Roland 9V1RT

------------------------------------------------------------------------

On 14/1/22 04:58, W0LEV wrote:
Even though they claim FCC approved, there is nothing filed on the FCC
OET
site for either JNCRADIO or CHELEGANCE. Nor are there required labeling
on
the product. Typical of China, the claim is bogus. Another clone, but
the
Instruction Documentation is pretty good and applicable to the real
produce
- the NANOs.

Dave - W?LEV

On Thu, Jan 13, 2022 at 8:24 PM Carl-Mikael Zetterling<bellman@...>
wrote:

An email today from Seeedstudio caught my attention.
They are now selling the JNCRadio VNA 3G - Vector Network Analyzer -
50k
to 3GHz

Look familiar?

Carl-Mikael









Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

William Smith
 

Any bets on how long it will take for someone to make a ¡°fake ¡°Chinese export mark where the letters are ¡°inadvertently¡° spaced out a little bit more than normal, so as to be indistinguishable from the European conformance mark?

73, Willie N1JBJ


On Jan 14, 2022, at 6:33 PM, vh2 <vh2@...> wrote:

?The real one has a larger space between the letters. []


Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

The real one has a larger space between the letters. []

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Mike C.
Sent: Friday, January 14, 2022 6:18 PM
To: [email protected]
Subject: Re: [nanovna-users] JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz



Gonna have to be more specific, "where's the beef?" Really impossible to see any difference. Other than the # marks, exactly the same. Mike C.



On 1/14/2022 5:44 PM, Jeff Green wrote:

Check out this:
;data=04%7C01%7Cvh2%40buffalo.edu%7Caed662ea9f3f480afa6108d9d7b435fb%7C96464a8af8ed40b199e25f6b50a20250%7C0%7C0%7C637777992429775194%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=wpfDK3QH7mnpq92MA1T%2By6x7VAi1BkCXctXPOMrWEyE%3D&amp;reserved=0.
The place I used to work got burned big time by "China Export" and "Conformit¨¦ Europ¨¦ene."


Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

Yep. China does not play by the rules of the rest of the world. Their
people are generally good. But the government is crooked as
.......well.......you fill in the missing word. Anything and everything to
better the "state". Follow the leader blindly off a cliff and don't ask
questions.

Working regulatory on the EMC/RFI side, the last 25 to 30 years, I watched
China, single handedly, convince the world markets it was all right to
cheap at testing and approvals and that your exposure just did not justify
the expense of doing things correctly and legally. They set the bar for
blatant cheating with the 'more-or-less" proper marks (never "quite"
correct) with absolutely no backing behind them. Now, even some major US
companies weigh their exposure in the marketplace and follow China's
example. Again, where the dickens is our FCC??!!!!! China these days
fully realizes that CFR 47 (the FCC) is not worth the paper it's printed on.

Dave - W?LEV

On Fri, Jan 14, 2022 at 10:45 PM Jeff Green <Jeff.L.Green1970@...>
wrote:

Check out this:

,mark%20and%20is%20considered%20fake
.

The place I used to work got burned big time by "China Export" and
"Conformit¨¦ Europ¨¦ene."





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


Re: JNCRadio VNA 3G - Vector Network Analyzer - 50k to 3GHz

 

Gonna have to be more specific, "where's the beef?" Really impossible to see any difference. Other than the # marks, exactly the same. Mike C.

On 1/14/2022 5:44 PM, Jeff Green wrote:
Check out this:
,mark%20and%20is%20considered%20fake.

The place I used to work got burned big time by "China Export" and "Conformit¨¦ Europ¨¦ene."