开云体育

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.

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.

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.

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.

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
"Conformité Européene."

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

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

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

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

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 "Conformité Européene."