开云体育

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

Got a message this morning! it is en route!


Le mer. 19 févr. 2020 à 07:43, Lawrence Macionski via Groups.Io
<am_fm_radio@...> a écrit :

I also ordered one during the "New Years" shutdown (wink-wink) and knew
there would be a wait. Never heard a thing. Till I read these messages. I
sent a second message to Maggie K.. Hopefully this one will be answered..

On Wed, Feb 19, 2020 at 05:55 AM, pez.arg wrote:

Instead of the calculated (real, imaginary) parts of (s, l, o, and rho) measurements, is there any way to get the raw data (magnitude, phase) of them ?
========================================================================================
With a serial terminal program connected to the NonaVNA, typing data(0) will return raw complex values for CH0. Typing data(1) will do the same for CH1. The complex data can be converted to magnitude and phase by computing the log and angle.

Using NanoVNA-saver or another program, data saved to s1p or s2p is also saved as complex values which may be likewise converted.

- Herb

I had something similar, re-setting Smith chart Scale to 1 fixed

--
I_B_Nbridgema

I hope I have compiled useful material. It works for me.

73, Gyula HA3HZ

Instead of the calculated (real, imaginary) parts of
(s, l, o, and rho) measurements, is there any way
to get the raw data (magnitude, phase) of them ?

hello, hernan,
I suspect that the support values are too far apart during calibration. Therefore the interpolation can lead to incorrect results. Try it again with NanoVNA-Saver and a smaller scan range.

--
DH1AKF

I also ordered one during the "New Years" shutdown (wink-wink) and knew there would be a wait. Never heard a thing. Till I read these messages. I sent a second message to Maggie K.. Hopefully this one will be answered..

two android phones, three cables and using the web app as well as
the android app, always the same "no device found" error.

Sadly, some Android devices for which OTG connects to e.g keyboards or flash drives
will not work with virtual COM port devices,
but you could also try nanoVNA with this Serial USB Terminal app using its CDC device setting


Generic OTG connection checker:

Sorry I forgot to mention it. I did calibrate it. And also tried with a
second nanoVNA. In both cases I got the weird impedance values.

So far I've been using the vna to measure HF antennas with no problems. The
results always matched other swr meters, for example.

El mié., 19 feb. 2020 08:40, Reinier Gerritsen <r.gerritsen@...>
别蝉肠谤颈产颈ó: