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Roy,
Browse the photo section of the forum and you'll find several of members that have added sma to XXX adapters where XXX can be N, BNC, PL259, TNC, etc.
Some members have created 3d-printed and other housings that hold the Nanovna with adapters as well in order to take the strain off the board mounted sma connectors.?



On Fri, 10 Jul 2020 at 5:31 PM, Roy J. Tellason, Sr.<roy@...> wrote: On Friday 10 July 2020 03:51:46 pm Roger Need via groups.io wrote:

On Fri, Jul 10, 2020 at 12:07 PM, Roy J. Tellason, Sr. wrote:

On Friday 10 July 2020 10:51:02 am alan victor wrote:

Highly recommend putting a connector saver on your vna ports. This is a SMA

female to male adapter. Then you can bolt onto it whatever you desire. The
motivation is to prevent dirt and corruption of the connectors soldered to the
instrument pc card. Over time if you? do not use the saver the on card sma
connectors will become unreliable.

Got a source for these?

? Make sure they are not RP-SMA.? You can find them on Amazon, eBay, DigiKey and online.? Here is a link to a good quality online one In the US.



DigiKey has outlets in US, Canada and UK.? Picture below is a sample of what they have available.

Roger

Thanks for that info.? I will probably be getting a pair of these,? and have started a conversation with my brother,? who knows a whole bunch of the local hams who also have this device,? so hopefully we can be putting something together.? I'm familiiar with the "socket saver" concept in tube testers,? and this idea makes a whole lot of sense to me.? It's rather sad that those connectors are that fragile.? I wonder if the NanoVNA could be retrofitted with BNC connectors later on?

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

Hi Roy,
Check my quickie forum search link at the top of the Wiki page and use specific search terms to find out more about testing toroid cores as there are probably over a hundred posts from various members on how they perform that.?
Also check posts from Herb, Rudi, Erik, Kurt and other members.?
/g/nanovna-users/search?q=toroid+cores



On Fri, 10 Jul 2020 at 4:57 PM, Roy J. Tellason, Sr.<roy@...> wrote: On Friday 10 July 2020 03:17:36 pm OneOfEleven wrote:

You might find this a bit informative Roy ..

A bit,? I didn't know about that phase stuff.? But I already have a component tester and an L-C meter to measure those parts with.

From what I've been able to gather regarding toroid cores,? the material makes a lot of difference in terms of the frequency range the thing can handle.? Beyond that things get a bit fuzzy...

It's not clear to me what I'd need to do to characterize these cores.? Wind a turn or two of wire and see what the value is?? Sounds a bit tedious.

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

As you probably have found out measuring unknown characteristics of torroids is not so simple. you can go here and get some ideas as to the possible types of materials you may have obtained.
In my case most of the junk torroids I've found have come from low frequency switching power supply applications running in the 100-200khz range and turn out to not be very useful for rf. I just decided to buy a few of several types of cores to see how they worked in some of my rf projects.
have fun with it.
73

On Friday 10 July 2020 03:51:46 pm Roger Need via groups.io wrote:

On Fri, Jul 10, 2020 at 12:07 PM, Roy J. Tellason, Sr. wrote:

On Friday 10 July 2020 10:51:02 am alan victor wrote:

Highly recommend putting a connector saver on your vna ports. This is a SMA

female to male adapter. Then you can bolt onto it whatever you desire. The
motivation is to prevent dirt and corruption of the connectors soldered to the
instrument pc card. Over time if you do not use the saver the on card sma
connectors will become unreliable.

Got a source for these?

Make sure they are not RP-SMA. You can find them on Amazon, eBay, DigiKey and online. Here is a link to a good quality online one In the US.



DigiKey has outlets in US, Canada and UK. Picture below is a sample of what they have available.

Roger

Thanks for that info. I will probably be getting a pair of these, and have started a conversation with my brother, who knows a whole bunch of the local hams who also have this device, so hopefully we can be putting something together. I'm familiiar with the "socket saver" concept in tube testers, and this idea makes a whole lot of sense to me. It's rather sad that those connectors are that fragile. I wonder if the NanoVNA could be retrofitted with BNC connectors later on?

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

Thanks for mentioning those other software packages, I did not realize there were so many. I just assumed that the files area contained them all. Regarding fixture I'm doing as you suggested. I picked up a sma cable at a swap meet, cut it down to 1" and put alligator clips on it.
I have a linux machine so I assume I could try nanovnasaver on it.. maybe it would even run on my raspberripi.

I know it makes a difference when you get to the ghz but I can't help but be amused by the suggestions to get special torque wrenches to attach those sma connectors. Back to plumbing, my least favorite hobby, at least nothing leaks out and causes a mess.

On Friday 10 July 2020 03:17:36 pm OneOfEleven wrote:

You might find this a bit informative Roy ..

A bit, I didn't know about that phase stuff. But I already have a component tester and an L-C meter to measure those parts with.

From what I've been able to gather regarding toroid cores, the material makes a lot of difference in terms of the frequency range the thing can handle. Beyond that things get a bit fuzzy...

It's not clear to me what I'd need to do to characterize these cores. Wind a turn or two of wire and see what the value is? Sounds a bit tedious.

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

Larry,

Thanks for the clarification on the touch calibration being stored in firmware.

But the calibration tables are not hard-coded in firmware so after a clearconfig 1234 the user must do a calibration because the NanoVNA does not go back to "factory settings". This is not important for those familiar with the nanoVNA but for beginners it is something to be aware of....

Roger

On Fri, Jul 10, 2020 at 12:05 PM, Roy J. Tellason, Sr. wrote:

Having a recently acquired NanoVNA-H4, and having a bunch of unmarked toroid
cores (some with windings, some without), I'd sure be interested in hearing
more about how you do this...

Take a look at the wiki for this group and you will see several test fixture links. Also search this group for postings on toroids and measuring inductance. Lots of good info for you...

Roger

On Fri, Jul 10, 2020 at 12:07 PM, Roy J. Tellason, Sr. wrote:

On Friday 10 July 2020 10:51:02 am alan victor wrote:

Highly recommend putting a connector saver on your vna ports. This is a SMA

female to male adapter. Then you can bolt onto it whatever you desire. The
motivation is to prevent dirt and corruption of the connectors soldered to the
instrument pc card. Over time if you do not use the saver the on card sma
connectors will become unreliable.

Got a source for these?

Make sure they are not RP-SMA. You can find them on Amazon, eBay, DigiKey and online. Here is a link to a good quality online one In the US.



DigiKey has outlets in US, Canada and UK. Picture below is a sample of what they have available.

Roger

Oh, wow! - Great idea (looks good but haven't tested it yet).
I like the dynamically sized menu buttons as well although on a 2.8" display it can get a bit crowded.
The memory recall is great, too. Now at a glance you can see what's empty and what ranges you've calibrated.
These are excellent enhancements.
Thank you!
...Larry

Reverse sma was used on wifi routers to discourage adding external
directional antennas which would violate the legal limits on effective
radiated power (ERP) and cause interference. Rg-6 coax is 75 ohm and is
used in the cable tv industry so the they use type f connectors. That cable
is used for l band (950-1450 mhz) for the downlink from dish and direct tv
antennas.

On Fri, Jul 10, 2020, 1:01 PM vaclav_sal via groups.io <vaclav_sal=
[email protected]> wrote:

Post purpose " REPLY

Went to local store and they did not have anything SMA to PL/SO.
Came home with "reversed" SMA female to RG6 female.
( I am really not sure what is reversed on the adapter - open to
suggestion / discussion / clarification )

I am also not so sure about RG6 connector name - like PLxxx.

However, I have plenty of RG6 to PL/SO adapters.

I agree - ideally less connector(s) the better , as long as the
MECHANICAL strain is not on the NanoVNA PCB.
That is my biggest concern I gathered from reading the mail here .

There probably is , or should be a 3D box with provision to securely hold
desired adapter, perhaps later project if it does not exists.
END OF POST

You might find this a bit informative Roy ..

On Friday 10 July 2020 10:51:02 am alan victor wrote:

Highly recommend putting a connector saver on your vna ports. This is a SMA female to male adapter. Then you can bolt onto it whatever you desire. The motivation is to prevent dirt and corruption of the connectors soldered to the instrument pc card. Over time if you do not use the saver the on card sma connectors will become unreliable.

Got a source for these?

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

On Friday 10 July 2020 10:15:01 am DougVL wrote:

I made a fixture to adapt alligator clips to my nano, for testing and trying to identify unmarked ?toroid cores.

Having a recently acquired NanoVNA-H4, and having a bunch of unmarked toroid cores (some with windings, some without), I'd sure be interested in hearing more about how you do this...


--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

Post purpose " REPLY

Went to local store and they did not have anything SMA to PL/SO.
Came home with "reversed" SMA female to RG6 female.
( I am really not sure what is reversed on the adapter - open to suggestion / discussion / clarification )

I am also not so sure about RG6 connector name - like PLxxx.

However, I have plenty of RG6 to PL/SO adapters.

I agree - ideally less connector(s) the better , as long as the MECHANICAL strain is not on the NanoVNA PCB.
That is my biggest concern I gathered from reading the mail here .

There probably is , or should be a 3D box with provision to securely hold desired adapter, perhaps later project if it does not exists.
END OF POST

Have updated this firmware branch with a reset menu and a new LC matching option.

The reset menu allows you to reset the main config and also clear all the saved calibrations. So if wanted a factory reset then you just apply both reset functions.

The LC matching option was added by request, but you can save flash by commenting out the "USE_LC_MATCHING" #define in the nanovna.h file before compiling.

LC matching tells you what components to add in what order (any combination of up to two components using caps/inductors). It uses the active marker as the load impedance to match. It's used in the EU1KY antenna analyser, and is quite cool.

Uri,
I found on my 1st Nano (the Gekko unit) that I had to press just off slightly from the 2 cal points in order to acheive an accurate touch calibration - that is why the developer added a touch-test function so you can see how accurate the cal is before you save it.
...Larry

Hi Roger,
The touchscreen cal defaults are hard-coded in the firmware and loaded into RAM initially.

clearconfig clears the user-calibrated touch parameters and subs the default - I physically checked - see image.
I did a re-cal of the touchscreen to produce no responce - a clearconfig restored the defaults.

...Larry

On H4 Any size card should work.
I test 128Gb, 32Gb, 8Gb, 2Gb card
Fat32, Fat16, exFat filesystem support

H version have limits, only Fat32/16 filesystem so 32 Gb max.

Thanks Roger,
It is too bad, because all trials as a beginner made a big mess.
Well, thanks anyway.
Uri