开云体育

Hi Dave. You can find the schematics in the Wiki in the Documentation section.
regards Bert

Then I would advise the -H4

Jos

Op 19-5-2020 om 14:31 schreef Bob Kircher:

Hi Bert thanks for the hardware information.
However .... I don't see some of the resistors mentioned on the only
schematic of the nanoVNA (12/29/16 @11:31AM) I can find.
I was interested to see which resistors needed changing before delving
inside. Is there an (earlier/later) schematic somewhere?
Dave

I'd say that there is another requirement - range used for SOL calibration and range used for measuring should be identical! More precisely, calibration points and measuring points should be the same. This is less impactful if measuring range is relatively small (narrow) comparing to the "center frequency" (for example 14.000MHz to 14.300MHZ vs 3.5MHz to 29MHz), but still ...

With lengths approaching quarter wave length, things (impedance transformation) become very fast changing, and in my experience, interpolation between points where actual calibration was done done becomes much less accurate.

No matter which one the cost is so low not worth looking for lowest cost
bad clone. You will be happiest with the current Hugen NanoVNA-H the gold
standard as I understand it. Buy from Amazon or other reputable source.
Suggest you avoid Banggood.

Bob Kircher, K7QXY
Tigard, Oregon
503-789-3983

Hi to all
I would buy NanoVna but i'm little confused :) There are many version H- F....??

Any Advice ?
Thanks



or

With all the China problems, are there any NanoVNA dealers in Europe?

I ordered pcbs that were ready at the end of March, they too got returned to the supplier for "security reasons".

Reshipped 4th April and they are still sitting in some warehouse in Shenzen waiting on the donkey to wake up and transport them to the airport.

Re the shipping out of Australia - pretty normal - our postal service is pretty crap at the best of times, I can get stuff from Germany quicker than I can get it from Sydney.

--
Terry VK5TM
( )

Yes, assuming the antenna is connected at exactly the same point as your open, short, load were connected. If there's an additional "pigtail" at the antenna or anything like that, that will have an effect.

If I connect the NanoVNA-H to a length of coax (about 20m of RG-11/U in this case) and perform an SOL calibration through the coax, will the NanoVNA then show me the feed point characteristics of the antenna to which the load end of the coax is connected?

Are there any other special settings that must be made?

Update from Mike, K0JTA:
Picked up and processed May 6 in Hong Kong via DHL, and is now in "CINCINNATI HUB, OH - USA" at this time!!! -Looks as if I will have the shipment in hand VERY soon, unless there is a US Customs delay!!! (Woo-HOO!)
--
*Mike* , K0JTA
?袄冲(ツ)冲/?

How about the rampant misuse of "your" and "you're"?

---?
Ciao baby, catch you on the flip side
??
73 de W3AB/GEO ???



You can say "over", you can say "out", you just can't say "over and out".

On Mon, May 18, 2020 at 12:09 PM, DiSlord wrote:

...Add Brightness setting to config menu. Now for set Brightness need select Config->Brightness and use leveler button Left or Right for adjust it. On done press leveler button Down for set. For save value need use Config->Save.

...Fix calibration reset error added in last patch, now this should work correct. Possible made calibration and not reset old calibration data, just disable
correction (not made reset) and made another calibration.
Open - Short calibration depend from self, need recalibrate it together.
Load calibration possible made alone
Isoln, Thru also depend from self, need recalibrate it together.
======================================================
DiSlord,
1. Thanks for adding the brightness menu back into the -H4 firmware. Changing and setting the brightness level using the lever is much more intuitive than using the keypad.

2. The calibration shortcut of turning off "correction' instead of Using "reset" is clever. I often need to re-do my THRU calibration with a different cable without losing my SOL calibration. The disable "correction" short cut worked great for this.

3. My CH1 noise floor terminated with 50 ohms looks very good up to 1500 MHz (see attachment). After the 5th harmonic of 260 MHz (1.3 GHz) actual measurements start to worsen, but I have a NanoVNA-V2 for measurements in that range.

4. Measurement of a 40 dB attenuator was fine up to 1500 MHz using your previous suggestion of using the DUT as a terminator for CH1 when doing the isolation calibration (see attachment).

Thanks again for your many contributions.

- Herb

What's a Grocer's Apostrophe? (humor)

--
73 de Rich NE1EE
On the banks of the Piscataqua

I purchased mine from

as suggested by members of the microwave group I'm a member of.

Delivery was less than a month.

---?
Ciao baby, catch you on the flip side
??
73 de W3AB/GEO ???



You can say "over", you can say "out", you just can't say "over and out".

R&L said that there may be H4's stock this week!

randy.ab9go@...


This message sent to you from my mobile device via speech-to-text
technology.

I also always upload last stable version of my firmware to:

nanovna-users@...>Files->Dislord's Nanovna -H Firmware

/g/nanovna-users/files/Dislord%27s%20Nanovna%20-H%20Firmware

Last NanoVNA-H is v0.8.4.5 at Apr 30
I not update H variant (most changes is H4 hardware depend, like ADC for touch, Brightness, gain settings, flash latency and e.t.c)

On Mon, May 18, 2020 at 01:40 PM, Oristo wrote:

Next H4 update

Added Wiki links: /g/nanovna-users/wiki#Sources
.. for -H and -H4 dfu appends, as well as H4 Hardware.py
The most recent NanoVNA-H found was from Apr 30..?
Those links will need updating when new DFU file appends are messaged..

Next H4 update

Added Wiki links: /g/nanovna-users/wiki#Sources
.. for -H and -H4 dfu appends, as well as H4 Hardware.py
The most recent NanoVNA-H found was from Apr 30..?
Those links will need updating when new DFU file appends are messaged..

I use standart case for NanoVNA-H and iPhone 5s battery on 1560mAh (height 3.5mm) many phone battery have height 3-3.5mm and can be put in this case.