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Asuming you can physically measure the length of the cable or you can cut a smaller length of the cable. This is my way to find the velocity factor using Dislords fw:

Measure the length of the cable. Connect the cable to CH0 (other end open or closed), and use Messue Cable. Now observe the reported cable length. I the reported length is not the same as the measured physical length then change the velocity factor until it is. The ”needed" velocity factor to get the same length is the vf of the cable.

73/SM6AYM

I bought a NanoVNA H-4 and found it good (for my own use).
I drew the MENUmap soft.ver. 1.1.01, when the right kind was not found on the Internet (at least for now).
The MAP can be found in the Photos folder.
73 de Markku oh2blv/oh2oa

Sorry about my late entry.. just joined. The ripples on the original 70cm VSWR image are the sort of thing regularly seen in microwave waveguide return loss measurements. These RL/VSWR ripples indicate an impedance mismatch or bump which (as suggested) a TDR can find. The other really interesting behavior which we used in the waveguide world, was the 'frequency difference' of one cycle of that sinusoidal pattern.. in your case I counted 3.5 cycles over the (453.9-436.5Mhz interval), giving 4.971Mhz per cycle (a 60.3m wavelength). With a half wavelength of 30.2m, that would be the free space distance to the mismatch bump point.. However, in coax with say a 0.66 VF (like LMR400), the real distance would be about 19.9m.. which I'd have it a guess is about the length of your coax..

If possible, try and substitute a different length coax, and repeat the measurement.. Just an idea...
David Burger
Chartered PE, Sydney.

During Kenwood transceiver bench alignments, they specify 100dBuVEMF as the S9+20 outer marker. This equates to -1dBm. As an anecdote, during a contest with multi-transmitters, we saw around 3Volts of RF at one receiver (tuned to a different band of course), and it survived quite happily. Best I can make out, the NanoVNA only outputs like -10dBm.. ??

If Wikipedia does not want the NanoVNA entry, please consider using the IEEE sponsored www.ethw.org history wiki. It's the perfect repository for articles, photos, sound and vision..

Being an IEEE Member gains you automatic access, (non-members can request access thru the web master in Piscataway), and naturally, no advertising, promotions, games. It's a great resource I facilitated back in 2014.. It's intended as a history wiki, and contains a lot of ham content... and of course, if its more than a day old - it's history ! Please consider.
David Burger
IEEE History Committee, Past Chair.

Early on firmware developers made "Menu Structure Maps" available. Is this,
what is now missing with all the latest firmware?

Is this what Chris is looking for?

Richard K8CYK

Perhaps the team over at Nifty-Guides could create one. They do a ton of
ham radios and other products.

Eric Gildersleeve

Chris,
As simple as the NanoVNA looks, there is really no quick reference on how to use it - it is a full VNA in the real sense.
That is like asking for a QR card for an HP or Anritsu VNA.
However, with that said, there are a few menu structure maps available either in the Wiki, files section or in various forum messages.
The menu maps are dependent on the version of firmware you have
Of course, since all of the available docs have been written by the NanoVNA users and submitted to the user group - feel free to distill a QR card for everyone, by going through the various user guides and messages. This is not a dig - others before you as well as myself, have done that to create the current docs you can grab on the user group.
...Larry

A “Quick Reference Card” that I could print and learn with like in the field or bench. No app or PC. The Wiki How to (at the end), YouTube, tells you how but not a “Quick Reference Card”.

Unless someone mentions using with an external computer, why would someone think they were ? Peculiar logic.

I used mine with the computer exactly once: to update FW and perform a battery of tests. The results were worse than with stand-alone and turns out others found similar (V2plus2) presumably due to the USB interface. When I have time I plan on checking out Joe Smith’s app as it seems to offer a lot of functionality improvement over stand-alone and my new LiteVNA I guess isn’t as bad when connected via USB, but I’m not looking forward to trying to get the Native Instruments runtime engine working on my Mac.

-=dave

Sent from my mobile phone.
(Please excuse any errors due to limited input and review capability.)

On Tue, Feb 8, 2022 at 09:01 AM, Charlie N2MHS wrote:

It would help us Elmers to know whether you are using the VNA standalone or
with your PC.
I never use mine standalone and always use NanoVnaSaver.

Try NanoVNA app by OneOfEleven. You may never go back to NanoVNA Saver. Better graphs and easier scaling, up to 4 plots on same graph, calibration works reliably and much more. You right click on graphs to set parameters.

Roger

Here's a list of everything imported - excluding stuff that's imported from within NanoVNA-Saver

It looks like numpy, scipy, serial and PyQT5.


Source File Import statement

Hardware/NanoVNA_V2.py import tty

Hardware/Hardware.py from collections import namedtuple
Hardware/VNA.py from collections import OrderedDict
NanoVNASaver.py from collections import OrderedDict
Windows/CalibrationSettings.py from functools import partial
Formatting.py from numbers import Number
SITools.py from numbers import Number, Real
Touchstone.py from operator import attrgetter
Settings.py from PyQt5 import QtCore, QtGui
SweepWorker.py from PyQt5 import QtCore, QtWidgets
Hardware/VNA.py from PyQt5 import QtGui

Hardware/NanoVNA.py from PyQt5 import QtGui

Hardware/NanoVNA_F.py from PyQt5 import QtGui

Charts/Polar.py from PyQt5 import QtGui, QtCore
Charts/Smith.py from PyQt5 import QtGui, QtCore
Inputs.py from PyQt5 import QtGui, QtWidgets, QtCore
Marker/Widget.py from PyQt5 import QtGui, QtWidgets, QtCore
Analysis/Analysis.py from PyQt5 import QtWidgets
Analysis/LowPassAnalysis.py from PyQt5 import QtWidgets
Analysis/VSWRAnalysis.py from PyQt5 import QtWidgets
Analysis/AntennaAnalysis.py from PyQt5 import QtWidgets
Analysis/BandStopAnalysis.py from PyQt5 import QtWidgets
Analysis/SimplePeakSearchAnalysis.py from PyQt5 import QtWidgets
Analysis/BandPassAnalysis.py from PyQt5 import QtWidgets
Analysis/PeakSearchAnalysis.py from PyQt5 import QtWidgets
Analysis/HighPassAnalysis.py from PyQt5 import QtWidgets
Widgets/SweepControl.py from PyQt5 import QtWidgets, QtCore
Windows/AnalysisWindow.py from PyQt5 import QtWidgets, QtCore
Windows/CalibrationSettings.py from PyQt5 import QtWidgets, QtCore
Windows/About.py from PyQt5 import QtWidgets, QtCore
Windows/TDR.py from PyQt5 import QtWidgets, QtCore
Windows/Bands.py from PyQt5 import QtWidgets, QtCore
Windows/SweepSettings.py from PyQt5 import QtWidgets, QtCore
Windows/DeviceSettings.py from PyQt5 import QtWidgets, QtCore
__main__.py from PyQt5 import QtWidgets, QtCore
NanoVNASaver.py from PyQt5 import QtWidgets, QtCore, QtGui
Windows/Screenshot.py from PyQt5 import QtWidgets, QtCore, QtGui
Windows/DisplaySettings.py from PyQt5 import QtWidgets, QtCore, QtGui
Windows/MarkerSettings.py from PyQt5 import QtWidgets, QtCore, QtGui
Charts/Phase.py from PyQt5 import QtWidgets, QtGui
Charts/SParam.py from PyQt5 import QtWidgets, QtGui
Charts/Magnitude.py from PyQt5 import QtWidgets, QtGui
Charts/MagnitudeZ.py from PyQt5 import QtWidgets, QtGui
Charts/Capacitance.py from PyQt5 import QtWidgets, QtGui
Charts/VSWR.py from PyQt5 import QtWidgets, QtGui
Charts/RI.py from PyQt5 import QtWidgets, QtGui
Charts/GroupDelay.py from PyQt5 import QtWidgets, QtGui
Charts/Permeability.py from PyQt5 import QtWidgets, QtGui
Charts/CLogMag.py from PyQt5 import QtWidgets, QtGui
Charts/LogMag.py from PyQt5 import QtWidgets, QtGui
Charts/QFactor.py from PyQt5 import QtWidgets, QtGui
Charts/Square.py from PyQt5 import QtWidgets, QtGui
Charts/Inductance.py from PyQt5 import QtWidgets, QtGui
Charts/Frequency.py from PyQt5 import QtWidgets, QtGui, QtCore
Charts/Chart.py from PyQt5 import QtWidgets, QtGui, QtCore
Charts/TDR.py from PyQt5 import QtWidgets, QtGui, QtCore
Charts/Chart.py from PyQt5.QtCore import pyqtSignal
Marker/Widget.py from PyQt5.QtCore import pyqtSignal
Widgets/SweepControl.py from PyQt5.QtCore import pyqtSignal
SweepWorker.py from PyQt5.QtCore import pyqtSlot, pyqtSignal
Settings.py from PyQt5.QtCore import QModelIndex
Analysis/PeakSearchAnalysis.py from scipy import signal

Calibration.py from scipy.interpolate import interp1d
Touchstone.py from scipy.interpolate import interp1d
Hardware/Hardware.py from serial.tools import list_ports
__main__.py import argparse

Windows/TDR.py import scipy.signal as signal

It would help us Elmers to know whether you are using the VNA standalone or with your PC.
I never use mine standalone and always use NanoVnaSaver.

On Feb 8, 2022, at 10:19, Jim Lux <jim@...> wrote:

On 2/8/22 8:11 AM, Cliff wrote:

Dino,

Followed your sequence, but I already had Python3 and Pip installed so didn't do those steps. Cloned the program and tried to run the python script and it yells about no PyQT5 module. Is QT also a requirement?

yes it is. There's several dependencies - pyserial and pyQT5 are two of them.

import logging
import math
import sys
import threading
from collections import OrderedDict
from time import sleep, strftime, localtime
from typing import List

from PyQt5 import QtWidgets, QtCore, QtGui

I figured so. I don’t understand the list above though. Are those just functions they do and getting PyQ5 and pyserial would catch them all?

73,
Cliff, AE5ZA

On 2/8/22 8:11 AM, Cliff wrote:

Dino,

Followed your sequence, but I already had Python3 and Pip installed so didn't do those steps. Cloned the program and tried to run the python script and it yells about no PyQT5 module. Is QT also a requirement?

yes it is. There's several dependencies - pyserial and pyQT5 are two of them.

import logging
import math
import sys
import threading
from collections import OrderedDict
from time import sleep, strftime, localtime
from typing import List

from PyQt5 import QtWidgets, QtCore, QtGui

Dino,

Followed your sequence, but I already had Python3 and Pip installed so didn't do those steps. Cloned the program and tried to run the python script and it yells about no PyQT5 module. Is QT also a requirement?

Cliff AE5ZA

YouTube?

On Tue, Feb 8, 2022, 9:35 AM Chris Edwards via groups.io <chris_b_edwards=
[email protected]> wrote:

Does anyone know of a quick reference card (how to setup the nanovna) for
doing different types of measurements, such SWR, cable length, etc.?

Try the "How-To" section at the end of the Wiki

Does anyone know of a quick reference card (how to setup the nanovna) for doing different types of measurements, such SWR, cable length, etc.?

Well, yes, but the OP didn’t specify exactly what he wanted to do, so we’re left guessing. Does he want to measure the physical length of a cable that’s already installed, so he can order a replacement? Does he want to know how much is left on a partial spool? Does he want to make phasing lines? How accurate does he want to be? Various people are answering all the above questions and more, but we don’t know, for instance, if he can cut a few feet off and measure the known length. [And as a consequence, most of the answers will be wrong, because they are answering the wrong question, but we don’t know what the right question is.]

That said, there’s a lot of knowledge in the answers that _have_ been given, so the entire discussion is worthwhile, and very educational.

73, Willie N1JBJ