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Sharing a common ground and being bonded together are two, different, things. In circuit layout it is not uncommon to keep the ground in several circuit sections separate until they are brought together at a single point. This helps to eliminate ground loops within the circuit. - Ed

I ordered a Hugen Nanovna H4 on 25 Jan and received a note, same date, from Maggie that is would be shipped after Feb 4.

Next received an SMS on 18 Feb and it arrived yesterday (Sydney, Australia).

It powers up but I won't have a chance to test it until next week.

Alan

--
Alan VK2AMC

Yes, pins 4 & 5 are shorted on the micro USB to tell the phone or tablet to switch to host mode and supply 5V output.

I just tested it successfully with a Galaxy S9 running Android 10 and the NanoVNA WebApp.
After you have connected the NanoVNA via USB OTG and the cable, that came with the NanoVNA, just start the App.
You will get a question, that needs to be confirmed.
Please see on the other picture the connections.

--
Joerg, EX-DB2OO

IIRC, the only difference in an OTG cable is a jumper between two pins of
the connector that plugs into the phone or tablet.

Mike N4MHO

But they say they are "Precision" :-)

(I am being a sarcastic of course)

Gedas, W8BYA EN70

Gallery at
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

Hi,

This calibrators not professional/precision/lab quality. I see older N calibrator kit. No electrical lenght, fringing capatinace, etc. definied. Nanovna-saver have menu for set the calibrator values.

HP, Kirkby Microwave, Hubers Suhner, etc. well designed precision kits. But not cheap.

73,
Lajos

Hi,

I have succes with nanovna and wifi. But have problems. I have old wifi router, TP-LINK MR-3220 V1.2. Firmware changed to Openwrt 17.01.7. USB ACM kernel module installed too. Ser2net packages installed to router. Currently maually add rights to /dev/ttyACM0, I not know why not work automatically.

Nanovna-saver not see the COM port on windows, but manually entered and now works. Now cable less nanovna working with nanovna saver.

I like the wireless vna-s. No cable = no big loss, no common mode current problem, etc.

Not nanovna, but the trick:


73,
Lajos

Received my DHL tracking number this morning via TXT message. I ordered my H version mid January from Maggie.

Hi,

Not easy way the multiple 1/2 lambda cut cables. If cable long, the loss is big problem on high frequency. The 1/2 lambda works good only one fixed frequency and short, precisely cutted 1/2 lambda cables on SWR meter. OSLT calibration may help. My method with wifi capable instrument, short coax cable 1/2 lamda on 145 mhz and 3 * 1/2 lambda on 435 mhz + cable end osl calibration. Zero lengh coax bad idea, the instrument part of the antenne.

73,
Lajos

BEGS the question what does "precision" mean.

Also would be awesome if someone who had one of these "precision" cal kits could gather some data on them on a lab VNA/ENA using a HP etc cal kit. That way you know exactly what you are getting.

Gedas, W8BYA EN70

Gallery at
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

Dang. I trusted my mail client to use the From address.

Sorry.

Rod - K7ZBE
--
On 2/19/20 10:32 AM, Rod Anderson wrote:

Roy,
I realized I never thanked you for the diodes.
They did arrive then went into hiding.? I just dug them up while cleaning up.
Thank you,
Rod - K7ZBE

Rod Anderson
K7ZBE
--

Please refer to my last version of the Console Command guide (Dec 2019) - it has information on QRP's scanraw command and is in the files section of the forum.

Roy,

I realized I never thanked you for the diodes.

They did arrive then went into hiding. I just dug them up while cleaning up.

Thank you,
Rod - K7ZBE
--
On 12/31/19 7:21 AM, Roy Ashkenaz wrote:

Free (in the USA) diodes available for battery indicator
I still have "extra" 1N4148WS diodes available. I had ordered 100 diodes from Amazon and have many left over.
If you want any, FOR FREE IN THE USA, send me a self-addressed stamped envelope and how many diodes you need. Email me for my mailing address.
Roy K2RMA AT ARRL.NET

Rod Anderson
K7ZBE
--

Hi,

QRP firmware has scanraw command. I not know, how to work. But will be extreme useful. External programs currently use nanovna internal calibration or double calibrations. Both method not good. Best way to calibrate external program read the raw values and calibrate all point externally with precision oslt method. See nanovna-saver, oslt model good, but scanraw currently not supported.

From QRP:
"added scanraw command (allows to read raw gamma data for unlimited point count with no calibration apply)"

73,
Lajos

Thank you very much indeed for this tip.
I will search in this direction. Thank you.

On Wed, Feb 19, 2020 at 09:29 AM, pez.arg wrote:

Thank you, but I can not see how the raw measurements can have the (real imaginary) form
=========================================================================

I may have misunderstood your original message. I thought you wanted to get the "magnitude, phase". Which can be derived from the complex data:


# data 0 & data 1 are complex (i.e. 0.365322053 -0.903783857) 101 points.
# Example of splitting complex data into real and imag:
# splitdata = s11Array.split(',')
# converteddata = np.array(splitdata)
# converteddata = converteddata.astype(np.float)
# real = converteddata[: : 2]
# imag = converteddata[1 : : 2]

From there the magnitude and phase can be derived from the converted real and imag data.

You may be looking for the gamma values. Per the console commands document in the files section:

sample command
- Samples gamma – (used for NanoVNA debugging)


I don't know the format for using the sample command as I have never needed to get that close to the actual raw voltage values.

- Herb

Thank you, but I can not see how the raw
measurements can have the (real imaginary) form

mine was to to be shipped on 12th, just got tracking info today

Kayak,
it seems to me, that you place the OTG adapter at the NanoVNA and not at the smartphone. Why do you need otherwise the"...USB-A to
micro-USB cables.."?
You need an OTG adapter plugged into the smartphone. The OTG adapter has a USB-A socket, into which you plug the USB-A to USB-C cable, which comes with the NanoVNA.

--
Joerg, EX-DB2OO