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On Sat, Mar 14, 2020 at 09:30 AM, Mark Schoonover wrote:

Another approach is to put a 2.5K resistor across the output.
=========================================================
That was pretty much the same reply to his question on Facebook by Robert Fontana ....

"A 49:1 transformer should map 2450Ω (49x50Ω) into 50Ω. If you place a (noninductive) 2400Ω resistor across the terminals and use the NanoVNA to measure VSWR, you should see a reasonably flat and low VSWR across the frequency of operation ...

Note, this only measures its low signal response, and does not take into account core saturation at higher power levels. It will, however, tell you over what frequency range the core is good for."

I guess he is looking for a different approach.

- Herb
.

Another approach is to put a 2.5K resistor across the output.

73! Mark KA6WKE

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On Sat, Mar 14, 2020 at 9:20 AM David Eckhardt <davearea51a@...>
wrote:

Likely the

Dave - W?LEVbest way is to connect two of them back-to-back.

Dave - W?LEV

On Sat, Mar 14, 2020 at 2:43 PM Praba Karan <vu3dxr@...> wrote:

What is the right way to check 1:49 UnUn with nanovna?

Just double-checked, mine was the 4" H-4 from seller AURSINC on Amazon. It was the first thing in my hands after my coffee!

Likely the

Dave - W?LEVbest way is to connect two of them back-to-back.

Dave - W?LEV

On Sat, Mar 14, 2020 at 09:05 AM, Jim Potter wrote:

Robert, Which one did you get? I made a purchase several months ago of the one sold by AURSINC.

================================================

Jim,
The NanoVNA-H4 only started selling just before the Chinese New Year so if you bought yours several month's ago it has to be the 2.8" NanoVNA-H, or NanoVNA-F if it has a larger screen. The NanoVNA-H4 is the 4" version with different processor and firmware.

- Herb

Hi,

i tried today the latest satsagen software version with my GPSO modified adalm pluto and I always get a "xo_correction return error Unknown error".
I run the adalm sucessfully with 25 Mhz...not with 40Mhz (I changed the clock via software configuration). The adalm works fine with all other applications like the sdr-console.

Does someone know what i can do?

Thx
Josef
==================================

Ask in the Satsagen group, perhaps?

/g/satsagen

Cheers,
David
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

Robert, Which one did you get? I made a purchase several months ago of the one sold by AURSINC. Thanks, Jim

Hi,

i tried today the latest satsagen software version with my GPSO modified adalm pluto and I always get a "xo_correction return error Unknown error".
I run the adalm sucessfully with 25 Mhz...not with 40Mhz (I changed the clock via software configuration). The adalm works fine with all other applications like the sdr-console.

Does someone know what i can do?

Thx
Josef

I received mine from Amazon a couple of days ago and love it! The only thing that bugged me a little was the tiny artifacts from the marker. I got brave and upgraded the firmware to the February release and now it's perfect! I purchased various SMA adapters and have been putting it to use. As a Amateur Radio Operator, this is hands down the best thing outside a radio and antenna I have ever purchased! It's got me pulling all my old antenna books off the shelf and re-studying everything. Mine also connected without issue to the Windows 10 64bit software and to the Android phone program...

What is the right way to check 1:49 UnUn with nanovna?

I saw a YouTube on how a guy was using a HackRF one as a tracking generator with the RSP2 with the new RSP_SAS

software release.? But, when I go to the tracking generator options with my RSP2, there is no listing for the HackRF one

nor the Lime Mini.? Anyone know anything about this?? It is kind of silly for me to ask, since I already have a Siglent SSA3021X

;-)

73

Glen K4KV

From: jafinch78 .

Being like a cost effect development board student hack-able device... looks like reading into a little more some are changing the TXCO to a 0.2ppm.

Wondering if there are better like external input capabilities (using the lab GPSDO) and using more capabilities on the chips for more performance? Looks like the sampling rate limit of the signal path is the USB 2.0, so wondering about that hack too.

Looks like the AD9361 datasheet grid array ( ) is different... plus might not be many options for other chips using a CSP BGA adapter sockets if thinking using a different chip. Checked and even on Aliexpress the socket adapters are half as much as the Pluto. First time for me looking at BGA socket adapters, interesting.
=============================

There's a lot of discussion on Twitter about the Pluto, for example follow:



It's a continuing development, so input and suggestions may not be amiss.

"Next gen libiio being worked on - if you have feedback, let us know. (Key thing is faster)."

Next generation hardware (if there's one) will likely be more expensive.


[Me: I'm waiting for a debugged, big screen, cased, with battery, 3 GHz+ NanoVNA-<whatever>]

Cheers,
David
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

Hi Hugen,

Existing plastic boxes should be rework. I think the best solution would be to increase the bolts' towers by 0.5mm, which can be glued with 4 plastic washers.
But any other distance can be a solution.
For example, a single-sided film glued to pcb, which raises 0.5 mm.
When I worked at QAM, we ensured the quality of the incoming and outgoing products. There was also an opportunity to solve the problem.
So life doesn't stop, we just see the world differently.

Good health to all.
73, Gyula HA3HZ

Sorry again for the trouble caused by our mistake, I have pasted the pillars for the NanoVNA-H4 currently on sale to temporarily solve this problem. I also received the improved shell, and I am a little bit dissatisfied. I will improve it further and use a revised version in April. If you have received a structural problem with the NanoVNA-H4 before, please contact me, and I will provide a revised shell for free. Sorry again!

hugen

On Fri, Mar 13, 2020 at 11:26 AM, Gufo Rosso wrote:

Ad9361 have 52mhz span

Being like a cost effect development board student hack-able device... looks like reading into a little more some are changing the TXCO to a 0.2ppm.

Wondering if there are better like external input capabilities (using the lab GPSDO) and using more capabilities on the chips for more performance? Looks like the sampling rate limit of the signal path is the USB 2.0, so wondering about that hack too.

Looks like the AD9361 datasheet grid array ( ) is different... plus might not be many options for other chips using a CSP BGA adapter sockets if thinking using a different chip. Checked and even on Aliexpress the socket adapters are half as much as the Pluto. First time for me looking at BGA socket adapters, interesting.

Roger,

If you are that unhappy with your purchase, contact me by email and I will buy your H4 from you.

You should probably consider buying a commercial vendor VNA that has the support, fit, and finish that you expect. Hugen's VNA offers terrific performance at a very low price but it is designed for people that expect to tinker rather than a plug-and-play product.

Cheers,
Bill

On Fri, Mar 13, 2020 at 02:00 PM, D R wrote:

What's the matter, Roger? Still don't know which end of a screwdriver to
hold? The required "fix" is well off the lower end of the scale for the
degree of difficulty involved, but all you can do is whinge because a little
too much tightness was applied to the case screws. If the solution is too
difficult for you to carry out, then send your H4 to me and I'll do it for you
FOC.

You expect to get a free replacement case for your "defective" H4? You do
realise that that would involve your having to completely remove the case
screws, thereby going well past the requirements for the simple fix? Are you
sure you're sufficiently technically qualified to carry out such an operation?

Read again what Herb posted and absorb the message!

Regards,
Dave

DR - Dave,

Herb Walker, David Eckhardt, Jim Allyn and nanovnauser disagreed with me and expressed their comments in a constructive and civil manner. I can see their point of view.

You on the other hand found it necessary to make this personal for some reason, question my technical skills and hurl insults. I guess that is just your way of communicating.

This is usually a friendly group. To keep it that way I will stop posting on this topic. Roger Need

I wasn't going to respond further, but I must. So, forgive me if I step on
anyone's toes.

Most of the buyers of the NANOVNA products have absolutely no idea what the
creators of these instruments have offered the RF community! They are so
far beyond the average "antenna analyzer" there is absolutely no comparison
at 10X the price, may even 30X!! I could name three offerings from other
suppliers that are priced between $ 350 and $ 1500 that don't even approach
the performance and capabilities of the NANOVNA offerings.

I am fortunate to have once worked for HP. At the time, HP encouraged
dumpster dipping. It was Bill and Dave's philosophy that if something
turned up in the large dumpsters and you had a good use for it, take it
home and its yours. That was the old HP (BC = before Carley, bless her
little crooked selfish self-centered heart!!). I am fortunate enough to
have acquired an HP 8753C with the associated S-Parameter test set - a VNA
(much like the NANOVNA products) that covers 300 kHz through 3 GHz with
guaranteed 100 dB dynamic range. In its day, that combination went for
something over $60,000. Maybe more as I no longer have my collection of HP
catalogs (we shouldn't mention the Nealy Sales "experiment"). The creators
of the NANOVNA products have reduced HP (R&S, TEK, ....) prices to
something around $100 that most of us can afford! After all, name a radio
we might buy, if your a ham, that costs $100? The last radio I bought,
likely my last, cost a bit over $3000. That was for the Icom 7610 and the
7300 is about $1K. These new instruments offer much of the capability that
the HP 8753C offerings. Sure, the noise floor doesn't guarantee 100 dB,
but, then, it isn't an HP piece of gear. 40 (at 1.5 GHz) to 80 (at LF and
HF and low VHG) dB of dynamic range (I refer to a typical reflection
measurement or out-of-band filter measurement) from 100 kHz (some lower
than that) through 1.5 GHz is a dream to me for all of $100 and is more
than the typical amateur can utilize!! And....... I can use them at the
antenna feed point. They even cover our newest amateur band - 2200-Meters
- which my 8753C does not.

So.......quit the belly aching and learn to use the instrument. These
online groups are here to help you learn, not belly ach.

And, once again, thank you guys and gals in China who created these
instruments for a job well done and appreciated!!!! Wish I could give all
of you a big hug. You've done all of us RF types a *major* favor!!!!!

So, quit the belly aching and learn to use the devices. Sincerely learning
how to fully utilize a vector network analyzer will teach you so much more
about our hobby of all things RF than any undergraduate text book on the
subject possibly could.

Dave - W?LEV

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On Fri, Mar 13, 2020 at 9:29 PM Jim Allyn - N7JA <jim@...>
wrote:

On 3/13/20 11:21 AM, Roger Need via Groups.Io wrote:

Why should customers have to start fixing a new product that they

purchased? Any reputable suppler stands behind their product.


Maybe you should start looking at Keysight or Rohde and Schwarz
network analyzers. They start at about 250 times the price of the
NanoVNA and up - WAY up.







I consider the NanoVNA to be a bargain. It's not the equivalent
of a Keysight or a Rohde and Schwarz, but then it's only 50 bucks. And
the NanoVNA design is open source, you could start manufacturing them
yourself with better build quality.

--

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

On 3/13/20 11:21 AM, Roger Need via Groups.Io wrote:

Why should customers have to start fixing a new product that they purchased? Any reputable suppler stands behind their product.

???? Maybe you should start looking at Keysight or Rohde and Schwarz network analyzers.? They start at about 250 times the price of the NanoVNA and up - WAY up.





???? I consider the NanoVNA to be a bargain.? It's not the equivalent of a Keysight or a Rohde and Schwarz, but then it's only 50 bucks.? And the NanoVNA design is open source, you could start manufacturing them yourself with better build quality.

I bought mine from Gigparts - yes it costs more but I have a 1 year
warranty on the thing. Caveat Emptor!

73! Mark KA6WKE

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On Fri, Mar 13, 2020 at 11:21 AM Roger Need via Groups.Io <sailtamarack=
[email protected]> wrote:

On Fri, Mar 13, 2020 at 06:17 AM, D R wrote:

Much ado about nothing: simply slacken the case screws a little to

relieve the

pressure on the display, and the problem will disappear.

Why should customers have to start fixing a new product that they
purchased? Any reputable suppler stands behind their product.

Hugen has not replied to my earlier question to him about what he intends
to do about the defective units that have been shipped. I have recommended
the Hugen product to multiple people on The Facebook NanoVNA User group but
sadly will stop doing that now....

Roger