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Which Nanovna buy?


pcast.fr 2021/02/28 10:51

Hello everyone,

Sorry for the wrong translation.

I am new and I am French. I have 68 years old, and I have been interested in radio since the 1970s.
I would like to buy a Nanovna for my HF, VHF and UHF antennas but in front of the number of version and clones, I do not know what to take.
I would like a closed box if possible because I can be brought to transport it.

I live in the center France and my name is Pascal

Amicably to everyone
Pascal :)

Neal Pollack 2021/02/28 19:56

In my opinion, the NanoVNA is a great, useful, and educational instrument
for BENCH use.
But since it has ZERO input ESD and static protection, I question the
usefulness of this tool
for outdoor antenna measurements.

There are more than a few people on this forum that have blown up their
NanoVNA, even
using it on the workbench, who likely did not understand ESD precautions,
and/or did not
understand that the NanoVNA has no (or very weak) ESD protection on the
inputs.

A slight breeze outdoors, passing your antenna, can generate over several
thousand volts of
static electricity. I personally use a device purposely built as an
antenna analyzer, and
it has protection built in, but of course, we get what we pay for.

While the nanoVNA has all the proper measurement functions and capability
to be used
for antenna measurements, it does NOT have the protections that formal
antenna analyzers
do. It was not purpose built as an antenna analyzer, with those specific
functions. Rather,
it was designed as a general purpose educational tool, toward a price
point, which precluded
inclusion of significant input protection devices.

My personal opinion? I am only connecting my antennas to my Rig Expert
analyzer.
I am using my nanoVNA on the bench, and I use an ESD bench surface pad and
an
ESD wrist-strap connected to an ESD monitor alarm. Not that expensive,
but since I
keep reading about people blowing these nanoVNA's up, I am not taking
chances with
mine.

Your mileage may vary. Your preferences may vary. If you wish to keep
your NanoVNA working
for more than half a season, I'd suggest the below short reading.

REF:

https://www.ece.ubc.ca/~robertor/Links_files/Files/understanding_esd.pdf

https://www.electronics-notes.com/articles/constructional_techniques/electrostatic-discharge/esd-basics.php

Cheers,

Neal

Lucio IØLYL 2021/02/28 22:29

Hi Pascal,
considering your age, which is more or less mine, I recommend a model that has a screen of at least 4 inches. Those with smaller screens are difficult to read at a certain age. :)
Here, we are in a group of NanoVNA V2 but do you really need a V2 version?
If you want to write me an email call@amsat.org.
73, Lucio I0LYL

Paul Warman 2021/03/01 06:53

Hi Neal, your mail is both useful, thanks, but very scarey and raises issues that to be honest I hadn’t even thought of! I have just bought a <https://www.ebay.co.uk/itm/4-SAA-2N-NanoVNA-V2-2-50kHz-3GHz-Vector-Network-Antenna-Analyzer-VNA-HF-VHF-UHF/143894922868?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649> 4" SAA-2N NanoVNA V2.2 50kHz-3GHz and now wonder if there are simple ways I can protect the instrument and use it for antenna measurements without detrimentally affecting its performance? I fear from your mail that there isn’t anything that can be done!

Thanks again, I think ;-}

Paul, G0odp

David J Taylor 2021/03/01 10:27

On 28/02/2021 18:51, pcast.fr@gmail.com wrote:
> Hello everyone,
> Sorry for the wrong translation.
> I am new and I am French. I have 68 years old, and I have been
> interested in radio since the 1970s.
> I would like to buy a Nanovna for my HF, VHF and UHF antennas but in
> front of the number of version and clones, I do not know what to take.
> I would like a closed box if possible because I can be brought to
> transport it.
> I live in the center France and my name is Pascal
> Amicably to everyone
> Pascal :)

Pascal,

I would recommend the larger screen device, and my most recent one seems
to work very well to 4 GHz, but it's out of stock:

https://www.tindie.com/products/hcxqsgroup/4-nanovna-v2-plus4/

There is a 4-inch with N connectors if that suits you better.

I also have a 1.5 GHz version which may also suit if you don't need
above 1296 MHz. It's also boxed.

https://www.passion-radio.com/meter/nanovnaf-945.html

Measuring antennas can be difficult, so seek advice here if the results
are not quite what you expect!

Cheers,
David GM8ARV
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv

pcast.fr 2021/03/01 15:17

Hello Neal,

You scare me. I don't know what to think, let alone what to buy. Yes, this is the external antenna for me, especially UHF.

Yes, occasionally, but it's quite rare when I deal with my PL259 or N, which happens when I have a small ESD. If my future nano is connected to a coaxial line, it will burn out.
I'm not going to buy the equipment for more than I can afford. Besides, I'm useless. I set myself a price of up to $150. But if I'm going to lose them randomly in an electrostatic wave, I'll think many times, as cheaply as possible, even if I have to look at the results with a magnifying glass;)

Thank you all for replying to me and I'll see all the links.

Ciao, Pascal

Dragan Milivojevic 2021/03/02 02:46

Just buy a NanoVNA H4 (around $50). You do not need anything better
than that.

On Tue, 2 Mar 2021 at 00:17, <pcast.fr@gmail.com> wrote:

Pascal CASTRATARO 2021/03/02 03:09

Hello Dragan Milivojevic

thanks for the advice :)
Where do you find in stock?


Le mar. 2 mars 2021 à 02:46, Dragan Milivojevic <d.milivojevic@gmail.com> a
écrit :

Pascal CASTRATARO 2021/03/01 18:28

Hello Lucio,

Your e-mail returns me an error ;)

OwO 2021/03/02 10:54

Antenna measurements below 1GHz, any of the cheapest V1 nanovna ($30)
will do.

OwO 2021/03/02 11:02

The ports on the V2 plus4 are rated for ESD up to 1000V (human body
model), but only 100V (machine model). In my tests it's susceptible to
static discharge through a long transmission line, but not susceptible
to slow charge buildup (that gets clamped very easily). If you discharge
antennas and cable before connecting to the VNA it should be safe.

Pascal CASTRATARO 2021/03/02 04:14

$30? I am interested, do you have a link?

Le mar. 2 mars 2021 à 03:55, OwO <OwOwOwOwO123@outlook.com> a écrit :

OwO 2021/03/02 11:27

Search "nanovna" on Aliexpress

On 02/03/2021 11:14, Pascal CASTRATARO wrote:

Pascal CASTRATARO 2021/03/02 04:51

OK but this version is not in a box and the screen is 2.8. I think for $20
more, I'll stay on the H4. But thanks anyway 😉 and at my age my eyesight
has gone down 😅

Le mar. 2 mars 2021 à 04:28, OwO <OwOwOwOwO123@outlook.com> a écrit :

Siegfried Jackstien 2021/03/02 04:24

best thing to buy ... a v2plus4 (v2 with metal case and 4 inch screen
and improved pcb design)

most bang for the buck saa2n (v2 with 4 inch and metal case ... older
design but good results)

do not buy the normal older nanovna ... get a v2 (or a "good" clone)

dg9bfc sigi

ps i have them all .. genuine v2... saa2n ... and a v2plus4


Am 02.03.2021 um 02:09 schrieb Pascal CASTRATARO:

Helmut Wabnig 2021/03/02 06:52

On Tue, 2 Mar 2021 02:46:00 +0100, you wrote:

>Just buy a NanoVNA H4 (around $50). You do not need anything better
>than that.
>

As fas as I know, the el cheapo vnas cannot do TDR.

w.

Siegfried Jackstien 2021/03/02 06:09

i would buy a v2plus4 or an saa2n

tdr? you mean to measure a cable length?

dg9bfc sigi

Am 02.03.2021 um 05:52 schrieb Helmut Wabnig:

Helmut Wabnig 2021/03/02 07:24

On Tue, 2 Mar 2021 06:09:53 +0000, you wrote:

>i would buy a v2plus4 or an saa2n
>
>tdr? you mean to measure a cable length?
>
>dg9bfc sigi
>

Lenght and quality.
My -F can do it.

w.

Siegfried Jackstien 2021/03/02 09:13

all v2 also can do it

and ... a lot more :-)

dg9bfc sigi

ps ... i did not real calibrate it and did not set velocity factor exact
... just wanted to show it works!

Am 02.03.2021 um 06:24 schrieb Helmut Wabnig:

n2msqrp 2021/03/02 08:28

Does the v2 versions do interpolation of the calibration? By interpolation I mean you can calibrate for a range of 1 to 30 Mhz. You can then examine a narrower range, such as 14-15Mhz with reasonable accuracy.

Mike N2MS

Dragan Milivojevic 2021/03/02 14:57

This is the official Hugen store on AliExpress:
https://www.aliexpress.com/item/1005001273374562.html

If you can live without the case just take the Owo advice and
get the cheapest clone you can find, it will be suitable as an
antenna analyzer.

On Tue, 2 Mar 2021 at 03:09, Pascal CASTRATARO <pcast.fr@gmail.com> wrote:

Dragan Milivojevic 2021/03/02 14:59

He was weary of static charge and wanted a case. V1 is the cheapest
option that satisfies those requirements.

On Tue, 2 Mar 2021 at 05:24, Siegfried Jackstien <
siegfried.jackstien@freenet.de> wrote:

Dragan Milivojevic 2021/03/02 15:02

Any real VNA can do TDR, including the cheapest clones.

On Tue, 2 Mar 2021 at 06:53, Helmut Wabnig <hwabnig@aon.at> wrote:

OwO 2021/03/03 00:13

Latest V2 firmware now supports interpolation calibration.

Also see https://nanorfe.com/nanovna-versions.html. New firmware efforts
are mainly focused on the plus and plus4 versions. There are too many
clones of V2_2 that differ subtly in parts used, and I can't guarantee
support for those. To be most future proof, either go for V1 or the
plus/plus4 versions of V2.

Markus Schrodt 2021/03/02 18:20

The plus4 is always out of stock. I know chinese new year and so on...
How about a possibility to preorder?

Am 2021-03-02 um 17:13 schrieb OwO:

OwO 2021/03/03 01:39

There is a shortage of LCD displays right now, but I think it will be
solved in 2 weeks or so. Everything else (main board, enclosures) are
ready. You can add your email to the waitlist or wait for an
announcement here.

Pascal CASTRATARO 2021/03/03 04:50

I will stay on an H4 at $ 50, I do not exceed 500 Mhz

Le mar. 2 mars 2021 à 05:24, Siegfried Jackstien <
siegfried.jackstien@freenet.de> a écrit :

mchenryproj 2021/03/03 04:18

I bought the NanoVNA SAA2N a few months ago and love it so far. I bought it for the metal case (although I have heard the metal enclosure can be an issue) and the N-Connectors (which apparently are just adapters to the original boards SMA connectors).  I used it just 2 days ago to set up a 160m antenna and it worked well. I bought this one also because I am still dipping my toes into EME on 1296 MHz and found it a good addition for testing antennas, etc.
The original one I bought had the smaller screen and plastic case. The screen was TOO small for my use and the rocker switch broke in the first hour of testing the unit.  Prices have gone up about $10 US since I bought mine.  Soa far so good.
Not sure what official updates there might be for it but it is working for my needs so I have found no reason to seek out firmware updates.
SeanKB8JNE

Spell checked by the NSA.

On Tue, Mar 2, 2021 at 10:51 PM, Pascal CASTRATARO<pcast.fr@gmail.com> wrote: I will stay on an H4 at $ 50, I do not exceed 500 Mhz
Le mar. 2 mars 2021 à 05:24, Siegfried Jackstien <siegfried.jackstien@freenet.de> a écrit :


best thing to buy ... a v2plus4 (v2 with metal case and 4 inch screen and improved pcb design)


most bang for the buck saa2n (v2 with 4 inch and metal case ... older design but good results)


do not buy the normal older nanovna ... get a v2 (or a "good" clone)

dg9bfc sigi

ps i have them all .. genuine v2... saa2n ... and a v2plus4




Am 02.03.2021 um 02:09 schrieb Pascal CASTRATARO:

Hello Dragan Milivojevic
thanks for the advice :)
Where do you find in stock?


Le mar. 2 mars 2021 à 02:46, Dragan Milivojevic <d.milivojevic@gmail.com> a écrit :

Just buy a NanoVNA H4 (around $50). You do not need anything better than that.

On Tue, 2 Mar 2021 at 00:17, <pcast.fr@gmail.com> wrote:

Hello Neal,   You scare me. I don't know what to think, let alone what to buy. Yes, this is the external antenna for me, especially UHF.   Yes, occasionally, but it's quite rare when I deal with my PL259 or N, which happens when I have a small ESD. If my future nano is connected to a coaxial line, it will burn out. I'm not going to buy the equipment for more than I can afford. Besides, I'm useless. I set myself a price of up to $150. But if I'm going to lose them randomly in an electrostatic wave, I'll think many times, as cheaply as possible, even if I have to look at the results with a magnifying glass;)   Thank you all for replying to me and I'll see all the links.
Ciao, Pascal

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