开云体育

BTW, I created a guide for nanoVNA users to use QUCS here

QUCS studio has a simulation block that accepts Touchstone files. It's the closest free software to ADS.

I suspect you can also load them into the free demo CopperMountain VNA software.

Here are some tips for those that may wish to duplicate this box design which has a front panel size of 92mm x 38mm:

- The hole centers for the two end connectors, "L" & "THRU" are 15mm from the ends.

- The "SOL" connectors are center-to-center spaced 20mm apart.

- This leaves about 22mm between "Thru" & "S" connectors.

- Needless to say the holes are centered on an end-to-end center line between the panel sides.

- All the holes have a diameter of 1/4 inch (6.35mm).

- The "THRU" connector socket nut was centered in place for epoxy welding by using it to temporarily mount a spare SMA connector in the hole. I chose to install a nut as opposed to threading the relatively soft aluminum with a 1/4" x 36TPI tap as the panel thickness is quite thin. As the knurled connector barrel threading does not extend all the way to the grip disc there is a gap in the thread where it passes through the panel. Thus when tightened in the socket there would be few if any threads engaged without a backing nut. In preparation for epoxy welding the socket nut I roughen the inside surface of the panel around the hole using a sand paper tool in my Dremel.

--
Enjoy!
Tom, VA7TA

GIT is not recognised by many distros until you install it.
Zorin is based on Ubuntu so try:
sudo apt install git

Hi!
I am new in Linux and use Zorin OS 15.
I tried to install NanoVNA-Saver, but git command is not recognized at terminal. Python is installed.
Is there any tutorial available about installing on Zorin OS?
Thanks in advance for any help.

I would like to see a DarkMode version of NanoVNASaver
I adjusted the Chart Colors, but there are no options for adjusting the control background colors

Thanks, Alan - wonderful source ! I love it. You made my day!

Congrats for having shown this. I can only agree.

From it's second very basic formula, (when leaving alone the '(db)',)
it is possible to derive the correct |Gamma| formula, as is used in the first one.

Resulting is:




with L for Load and S for Source, the asterisk meaning conjugate complex.

Just one little remark - knowing we cannot easily change words everybody uses:

The "incident" and "reflected" power is found on a transmission line.

At a complex impedance termination of a complex impedance source,
there is nothing reflected, however.

The power difference, instead, is that between "available" (but not always fully used)
real power and the real power actually delivered to and dissipated in the load’s real part.


In which exact IEEE document did you find it?
When was that published? Where and how can I get a copy?


Why does the probably best Smith diagram program available today,
(that I do not want to name in this context,) when using a complex source,
ignore the IEEE quote and rather stick to that false ATIS like formula?

Why does ATIS not change the false one? I think, time has come to do so.

Thanks again Alan - for this, it's the best source I ever was shown so far !


73, Hans
DJ7BA






-----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von alan victor
Gesendet: Dienstag, 2. Juni 2020 18:31
An: [email protected]
Betreff: Re: [nanovna-users] out of "Presentation on the NanoVNA for the raileigh Radio Society", Now: "False Return Loss Calculations"



On this return loss discussion... sorry can't help myself...



See the attached. Hope that clarifies... again.



Alan











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One additional observation:

If I pause the sweep and select the CW freq, there is no output until I un-pause the sweep.
However, I can then pause the sweep again and the output remains on.

Hi Herb,
I contacted R&L about buying and shipping a Nanovna-H4 to Canada.They sell the H4 for $60US but they quoted me $30US for USPS shipping to Toronto which sounds way too high.
Needless to say, I bought an H4 from Banggood (Hugen said they are original) - they have the H4 on sale today for $63US ($93CAD) with $3 shipping & tracking to Canada ($96 total).Lately, I've been getting stuff from Banggood in 3 weeks.

From R&L, it would have cost me $124 CAD.
...Larry

Rudi,
I don't understand the problem you are having with your nanovna-H.
I have a current version of firmware on my nanovna and under the stimulus menu, there is "CW FREQ"
The nanovna generates a constant output frequency - even if you press the "PAUSE SWEEP" button.
As an RF generator, you will need to contend with all the harmonics as the Nano outputs a squarewave.
regards,Larry

On Tue, Jun 2, 2020 at 09:06 AM, Rudolf Schaffer wrote:

i thought to use it as a RF generator. I split the output (Mini-Circuits device 2 ways splitter) in 2 outputs;

one is used as the RF signal source (~-3dB loss) and the second output go to a frequency meter, with a G3RUH GPSDO

as reference. As a "CW" command is not available in nanovna-saver, i used the "CW" function, entering directly the

desired frequency "manually" into the nanovna.
========================================

Rudi,
That set up will work O.K. below 300 MHz where only fundamentals are used, but at 300 MHz and above, where harmonics are used, you may need a 300 MHz high pass filter. At 300 MHz the fundamental at 100 MHz is 15 dB higher on my NanoVNA.

- Herb

On this return loss discussion... sorry can't help myself...

See the attached. Hope that clarifies... again.

Alan

On Tue, Jun 2, 2020 at 01:14 AM, Hugen wrote:

R&L is already in stock.

Hugen,
Any chance of working with R&L to get them to be a supplier for your S-A-A-V2.2?

- Herb

Sorry, a typo lapsus had entered, a "-" instead of a "+":

evaluating the false formula, Instead of below

"from this we get: RC = (50 + j100 – (100 – j100)) / (50 + j100 – (100 – j100)) = -50 / (-50 + j 200)."

please read:

" from this we get: RC = (50 + j100 – (100 – j100)) / (50 + j100 + (100 – j100)) = -50 / (-50 + j 200)."

The result at the right was not influenced by the typo lapsus, however.

Sorry. I hope there were no other ones. (Let me know, if so.)

Further, instead of the so far headline "Presentation on the NanoVNA for the raileigh Radio Society"
where the above was just one point of so many, I think, we should better call the headline now
"False Return Loss calculations".

73, Hans,
DJ7BA

-----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von DJ7BA
Gesendet: Dienstag, 2. Juni 2020 16:14
An: [email protected]
Betreff: Re: [nanovna-users] Presentation on the NanoVNA for the Raleigh Amateur Radio Society

Hi Dana,

thanks for your clarification request.
Sorry that I thought it was obvious, I was a bit too short, I think.

The following should take care, hopefully:

On



You can find a circuit diagram, that (disregarding the + and – DC signs) we will use here.

Zs and ZL each are a series of a resistance and a reactance, in the resonance example, XS and XL are reactances of of equal magnitude but opposite sign – as typical in a resonant serial LC circuit.



Let’s understand ZS as impedance of the source, (in my earlier example it is Z2 = R2 + j X2) and ZL as impedance of the Load, (in my earlier example it is Z1 = R1 + j X1) .

As was written in the simple resonance example, let be:

Generator (or Thévenin equivalent) impedance: Z2 = R2 + jX2 = 50 +j100 Ohm,
Load impedance: Z1 = R1 + jX1 = 100 –j100 Ohm.

meaning:

R1 = 50 Ohm
X1 = +100 Ohm ( represents omega * L)
R2 = 100 Ohm
X2 = -100 Ohm ( represents 1 / (omega * C)

we can use the (ATIS published) left part “false assumption” formula, neglecting also the magnitude signs, that are falsely arbitrary, too, as the reflection factor in general has a complex value, of course – just look at any Smith diagram):

as found here:





from this we get: RC = (50 + j100 – (100 – j100)) / (50 + j100 – (100 – j100)) = -50 / (-50 + j 200).

Using EXCEL (because of it’s ability to easily do complex math), this yields:

RC = 0.3333 –j 1.3333

or, if we don’t ignore the magnitude, as ATIS uses it:

RC = | 0.3333 –j 1.3333 | = 1.374

already here we see, that RC (or gamma, as it is sometimes called, too) in a passive lumped element circuit is > 1 ! That is wrong already.

Nevertheless carrying on with it, we get:

SWR = 1 + |RC| / ( 1 - | RC |) = 1 + 1.374 / (1 – 1.374) = -6.342 which, of course, is negative, the fact that the otherwise excellent article of Trevor S. Bird had quoted, not noticing that it yields a negative result, which he wanted to prove is not correct – just as you had said, too, as in a passive lumped element circuit RL must be positive.

I don’t know if you can use complex EXCEL, but I hope so.
Feel free to use – besides the simple resonance example – also any other complex values by entering these in the yellow EXCEL fields.

Just in case not - I also add a picture of the EXCEL. In some other work sheet programs, you may be able to make use of that, too.



73, Hans
DJ7BA








-----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von Dana Whitlow
Gesendet: Dienstag, 2. Juni 2020 01:49
An: [email protected]
Betreff: Re: [nanovna-users] Presentation on the NanoVNA for the Raleigh Amateur Radio Society



Hans, I don't understand your "obvious example" circuit.

Could you please describe it in detail, perhaps expressed as a spice netlist in the body of your reply, for simplicity?



Thanks,



Dana







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Dear OM Gyula,

For antennas measurements including feeders, filters, etc,? i'm using my NanoVNA-H connected to nanovna-saver

in the shack. For direct antenna measurement, i'm using the VNA in "mobile" mode, tnx to the internal battery.

As i'm not equipped with a RF generator and after measuring the RF output of the NanoVNA,

(not too bad hi !) i thought to use it as a RF generator. I split the output (Mini-Circuits device 2 ways splitter)? in 2 outputs;

one is used as the RF signal source (~-3dB loss) and the second output go to a frequency meter, with a G3RUH GPSDO

as reference. As a "CW" command is not available in nanovna-saver, i used the "CW" function, entering directly the

desired frequency "manually" into the nanovna. I asked via the group, if an other solution was possible and i received

answers with 2 possibilities: -1- Using a null span sweep centered on the desired frequency and -2- Sending, with PuTTY

free software, the " ch> freq {frequency value in Hz} to the same COM port after shutting down the nanovna-saver software.

This is all the "story" and without the help found in the group, i would be still obliged to enter the frequency using

the "CW" function described in the NanoVNA-H user Menu Structure paper furnished with the VNA.

With my best 73,

Rudi, HB9ARI

Hi Dana,

thanks for your clarification request.
Sorry that I thought it was obvious, I was a bit too short, I think.

The following should take care, hopefully:

On



You can find a circuit diagram, that (disregarding the + and – DC signs) we will use here.

Zs and ZL each are a series of a resistance and a reactance, in the resonance example, XS and XL
are reactances of of equal magnitude but opposite sign – as typical in a resonant serial LC circuit.



Let’s understand ZS as impedance of the source, (in my earlier example it is Z2 = R2 + j X2)
and ZL as impedance of the Load, (in my earlier example it is Z1 = R1 + j X1) .

As was written in the simple resonance example, let be:

Generator (or Thévenin equivalent) impedance: Z2 = R2 + jX2 = 50 +j100 Ohm,
Load impedance: Z1 = R1 + jX1 = 100 –j100 Ohm.

meaning:

R1 = 50 Ohm
X1 = +100 Ohm ( represents omega * L)
R2 = 100 Ohm
X2 = -100 Ohm ( represents 1 / (omega * C)

we can use the (ATIS published) left part “false assumption” formula, neglecting also the magnitude signs, that are falsely arbitrary, too,
as the reflection factor in general has a complex value, of course – just look at any Smith diagram):

as found here:





from this we get: RC = (50 + j100 – (100 – j100)) / (50 + j100 – (100 – j100)) = -50 / (-50 + j 200).

Using EXCEL (because of it’s ability to easily do complex math), this yields:

RC = 0.3333 –j 1.3333

or, if we don’t ignore the magnitude, as ATIS uses it:

RC = | 0.3333 –j 1.3333 | = 1.374

already here we see, that RC (or gamma, as it is sometimes called, too) in a passive lumped element circuit is > 1 ! That is wrong already.

Nevertheless carrying on with it, we get:

SWR = 1 + |RC| / ( 1 - | RC |) = 1 + 1.374 / (1 – 1.374) = -6.342 which, of course, is negative, the fact that the otherwise excellent
article of Trevor S. Bird had quoted, not noticing that it yields a negative result, which he wanted to prove is not correct – just as you had said, too,
as in a passive lumped element circuit RL must be positive.

I don’t know if you can use complex EXCEL, but I hope so.
Feel free to use – besides the simple resonance example – also any other complex values by entering these in the yellow EXCEL fields.

Just in case not - I also add a picture of the EXCEL. In some other work sheet programs, you may be able to make use of that, too.



73, Hans
DJ7BA








-----Ursprüngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von Dana Whitlow
Gesendet: Dienstag, 2. Juni 2020 01:49
An: [email protected]
Betreff: Re: [nanovna-users] Presentation on the NanoVNA for the Raleigh Amateur Radio Society



Hans, I don't understand your "obvious example" circuit.

Could you please describe it in detail, perhaps expressed as a spice netlist in the body of your reply, for simplicity?



Thanks,



Dana







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Dear Rudi,
you started the "PC software with" CW "function" topic.
Shouldn’t other similar, related information be written in the same topic?
Slowly there will be 14,000 entries in this group, I think this is a record!
Don't break up what you have to say, please.
Thank you for your attention

73, Gyula HA3HZ

--
*** nothing is permanent only change ( ) ***

In previous posts, several have suggested different torque wrenches. He was pro and contra.
It was not mentioned anywhere, leaving when disconnecting the SMA connection, it is not the torque wrench to be used but a standard wrench.
This is just a small addition to those who have lived their lives without a torque key so far.

73, Gyula HA3HZ
--
*** nothing is permanent only change ( ) ***

R&L is already in stock.

After the "0" span solution, i tried the "ch>? freq 50000000" command and bingo ! i get a 50 MHz CW frequency !

Many tnx,

Rudi