开云体育

Hello - I think FAQ would be a great idea (the suggestion has appeared occasionally in the past; I think it would be very beneficial).

If I can be of any assistance with configuration adjustments to improve ability to find and access FAQ, please let me know (either e-mail [email protected] or wb0gaz@...)

Dave WB0GAZ (originator of [email protected] and co-owner with Dave KC0WJN)

When buying from AliExpress or Banggood I consider if I need to return the item if it is worth it.

I got a smart $46 watch and it went dead in 5 days. It cost $23.50 to return it on 11/25/19. It still has not arrived and USPS said they can't track it after it leaves the US. Much like the farmer who bought Cotton Candy at the fair. "Gypped again, sweetened air. "

I have had satisfaction on several items received broken or not as described. Got 10 - 18650 LiIon unprotected cells. They were several mm longer as they had PC on the bottom for low voltage and overcharge protection. They would not fit in the device. As I could show in a picture wt. a caliper they were over the 650 mm in length they gave me credit for the order.

If my NanoVNA goes bad in warranty. I will just order an other from an other vendor. Some do offer "free return" but not sure what that means.

73 de KF7SLM, Jim

On Fri, Jan 17, 2020 at 09:05 AM, Larry Rothman wrote:

A number of forum members have 2 or even 3 of the Nano's and I for one have
already modified mine to reduce noise and increase the freq range specs.
my $0.02

Larry,

Would you consider making a separate post detailing what you did to increase the freq range and reduce noise?

Roger

On Fri, Jan 17, 2020 at 09:44 AM, Jerry Gaffke wrote:

Herb,
Actually, two different odd harmonics get used.
From Erik's post of /g/nanovna-users/message/1743

You are explaining well, except the SW uses above 300MHz the 3rd harmonic of one clock and the 5th harmonic
of the other clock to avoid detecting the 3rd harmonic of the mixing product of the 1st harmonics of the clock's
Example 200MHz + 200.00166MHz produce from 1st harmonic 1.66kHz which will include a certain amount of 3rd harmonic at 5kHz.
Using 200MHz + 120.001MHz produces only 5kHz when their 3rd and 5th harmonic combine

Also, the Si5351 is spec'd to operate at up to 225 mhz, anything beyond that is a gift.
Those for which the PLL craps out at 290 mhz are not necessarily from "shady sources".
Perhaps just cut from the outside edge of the wafer, but still perfectly compliant with the spec.
==============================================================

Jerry,
Thanks for adding the additional information. I oversimplified in trying to stay in line with the "over-clocking analogy". I can always depend on other user's like yourself to add to the discussion with more in-depth info. That's what makes this forum a cut above.

- Herb

On Fri, Jan 17, 2020 at 09:51 AM, <nanovnagroup@...> wrote:

" just trying to make a reasonable effort to get the original Hugen unit as for basically the same price his design and build quality is obviously better, and also rightfully deserves the credit and the sale over the others. "
===========================================================

For me the choice comes down to would you pay the same price for a 2019 vehicle versus a 2020 model. hugen is selling his 2020 2.8" NanoVNA-H with version 3.4 PCB for the same price ($50usd) as last year's model. Additionally, he is selling his 2020 4" NanoVNA-4 with version 3.4 PCB for 10 dollars more ($60usd). The changes made to the version 3.4 PCB improve operation out to 1.5 GHz, and Eric (one of our trusted members) has even hinted at possible usefulness to 2.1 GHz.

As Larry replied, currently ordering through hugen's Alibaba store is the only way to ensure you are receiving the latest version. I was initially hesitant about doing so, but Maggie King has been a pleasure to deal with and I had no problems completing transactions using my Paypal account. The only caution I would warn you about is that Chinese New Year is fast approaching and you may encounter shipping delays when ordering from any Asian source in another week or two.

- Herb

I think the vendor really needs to supply a larger PC board with PC mount
SMA female connectors. The larger PC board would even be better for
presentations as it could be more easily seen, The SMA connectors would be
more robust and provide easy connections.

*Clyde K. Spencer*

thank you

The rocker switch has several functions.? It's a menu selector, marker adjuster, and even frequency selector.
The nanoVNA has many 'hidden' functions and it's an adventure to see what happens when you try stuff.
Bob

The answer to that question is a bit of a moving target. As you have probably noted already different users running the same base distro can have different results depending on what dependencies are already on their systems as required by other software they installed. What can be said is that it will work on your system once you have all the dependencies satisfied and you can invoke the right incantations.

73

-Jim
NU0C

On Thu, 16 Jan 2020 11:05:28 -0500
"Pierre Martel" <petem001@...> wrote:

Anyone can report what version and linux distro they are using where
NanoVNA-saver works right away?

Personally, I think you should:
1 - Pay about $10 more and get the H4 version with the 4" display and better RF layout (lower noise) - search hugen's posts for the seller info.
or
2 - Wait for the Version 2 device to come out at _about_ the same price as the H4 (different designer) but with 4" display and 3GHz range. Hopefully it should be out in about a month.

On Fri, Jan 17, 2020 at 08:40 AM, Alberto I2PHD wrote:

I thought the rocker switch was meant only to move the marker(s) position.
But if I use it just after having changed the Start or the Stop frequencies of the Stimulus, it acts on them... not what I was expecting.

Is that normal, as designed, or is it a bug ?
Firmware 0.5.4, compiled on December 9.
=======================================================
edy555 release notes from version 0.5.0 :

NanoVNA-0.5.0_20191117
0.5.0-20191117
? add lever operations that support shifting center freq, zoom span and marker search

See for a summary of the functions that have been added to each of edy555's releases. Other firmware creators (i.e. QRP, hugen, eric) may not have implemented these functions so the added lever support may not be applicable to all users.

- Herb

No intention to complain just trying to make a reasonable effort to get the original Hugen unit as for basically the same price his design and build quality is obviously better, and also rightfully deserves the credit and the sale over the others. I would assume some ebay resellers are offering the original they get wholesale at AliBB, but its hard to differentiate them and I don't think the 900MHz stated frequency limit automatically disqualifies a particular unit from being original, specially if it seems to have the correct look and packaging, but then again it also does not guarantee anything either. I wish sellers would publish a picture showing the PCB and shields as it would make selection easier, and even if they ship something different then at least one could file a not as described complaint, although it would hardly be worth the hassle trying to return the unit.

Herb,

Actually, two different odd harmonics get used.
From Erik's post of /g/nanovna-users/message/1743

You are explaining well, except the SW uses above 300MHz the 3rd harmonic of one clock and the 5th harmonic
of the other clock to avoid detecting the 3rd harmonic of the mixing product of the 1st harmonics of the clock's
Example 200MHz + 200.00166MHz produce from 1st harmonic 1.66kHz which will include a certain amount of 3rd harmonic at 5kHz.
Using 200MHz + 120.001MHz produces only 5kHz when their 3rd and 5th harmonic combine

Also, the Si5351 is spec'd to operate at up to 225 mhz, anything beyond that is a gift.
Those for which the PLL craps out at 290 mhz are not necessarily from "shady sources".
Perhaps just cut from the outside edge of the wafer, but still perfectly compliant with the spec.

Jerry, KE7ER


On Fri, Jan 17, 2020 at 09:20 AM, hwalker wrote:

On Fri, Jan 17, 2020 at 07:49 AM, <nanovnagroup@...> wrote:

From the link at the Wiki section:


It states that top frequency range is 900MHz:
========================================================
It actually states that third harmonic operation is 300-900MHz. The fifth
harmonic is used for 900-1500 MHz operation. This is a basic principal of
operation for the NanoVNA that should be well understood by most user's. I
would think that would be especially true if the user's the name is
"nanovnagroup" :)

As Larry replied, some NanoVNAs will only able to reliably achieve 266.7-800
MHz third harmonic operation, and 800 - 1.300 MHz fifth harmonic operation.
Hugen specs his v3.4 NanoVNA-H as operating reliably to 1.5 GHZ. His v3.4
board uses the same synthesizer chip as his original NanoVNA-H so I'm guessing
he must be cherry picking his synthesizer chips. Think of it as overclocking
your PC's clock, the majority of legitimate chips will operate reliably pass
their marked frequency, but those using seconds from shady sources probably
will not.

- Herb

On Fri, Jan 17, 2020 at 06:30 AM, Ken Kayser wrote:

Hi. Has the Save/Reteive Settings feature ever been implemented? Seems like I have seen a post that said it was but can't find it in the program. Thanks all.
=================================================

Ken,
The NanoVNA does not allow the settings you save in memory locations 0-4 to be saved externally and restored to the unit. Rune's NanoVNA-saver program allows you the save and retrieve calibration settings that you perform within his program; however, these are only for use within his program.

If you are asking if NanoVNA-saver allows you save and restore configuration information, such as its current operating state, that is not a feature Rune has implemented but is probably on his to do list.

- Herb

On Fri, Jan 17, 2020 at 07:49 AM, <nanovnagroup@...> wrote:

From the link at the Wiki section:


It states that top frequency range is 900MHz:
========================================================
It actually states that third harmonic operation is 300-900MHz. The fifth harmonic is used for 900-1500 MHz operation. This is a basic principal of operation for the NanoVNA that should be well understood by most user's. I would think that would be especially true if the user's the name is "nanovnagroup" :)

As Larry replied, some NanoVNAs will only able to reliably achieve 266.7-800 MHz third harmonic operation, and 800 - 1.300 MHz fifth harmonic operation. Hugen specs his v3.4 NanoVNA-H as operating reliably to 1.5 GHZ. His v3.4 board uses the same synthesizer chip as his original NanoVNA-H so I'm guessing he must be cherry picking his synthesizer chips. Think of it as overclocking your PC's clock, the majority of legitimate chips will operate reliably pass their marked frequency, but those using seconds from shady sources probably will not.

- Herb

Unless you purchase from hugen's preferred seller, you don't really know what you're going to get.
I purchased a Gekko unit back in June - and there was nothing wrong with using it over 1GHz.
Others have had issues.
If people want to complain about what this unit does for $39US, then they should buy one of the $400 units sold on ebay and elsewhere with reliable specs.
A number of forum members have 2 or even 3 of the Nano's and I for one have already modified mine to reduce noise and increase the freq range specs.
my $0.02

That's by design.

A cheaper solution would be to take a board mount female SMA connector,
solder a strip of 3 header pin sockets to it instead of a PC board.
Then clip up a pin header strip into sections of 3 pins to mate with the sockets,
and add a selection of junkbox resistors and coils and caps and crystals to each.

Total cost of about $5. No U-FL connectors to break. No $40 demo board.
If you keep everything down under 100mhz, no need for 10ghz connectors.
The only thing that's going to wear out is the 3 header pin sockets,
which are easy to replace for pennies.

Jerry, KE7ER

I wonder if any H versions with the right original look and still being advertised ebay now a days with only a 900MHz top frequency limit instead of 1500MHz are automatically guaranteed to be "cheap Chinese" Hugen clones, or might as well just be older leftover stock of earlier genuine builds before the higher 1.5GHz was achieved. Asking because the former was recently suggested here:

/g/nanovna-users/message/9752

Just trying to gather as much info as possible before ordering a unit, but for my own reasons I am not too motivated about ordering at his AliBB store, so please no need to comment on this.

I thought the rocker switch was meant only to move the marker(s) position.
But if I use it just after having changed the Start or the Stop frequencies of the Stimulus, it acts on them... not what I was expecting.

Is that normal, as designed, or is it a bug ?
Firmware 0.5.4, compiled on December 9.

TNX

Alberto