Re: automatic loading of a nanovna saver cal file?
Yes, it can when using PC and at least SAVER. Store the cal file on the PC
for later use.
Dave - W?LEV
toggle quoted message
Show quoted text
On Mon, Jan 10, 2022 at 8:49 PM chutton12000 <charlesh3@...> wrote: Can this be done? I have sometimes forgotten to load the file.
Chuck
--
*Dave - W?LEV*
*Just Let Darwin Work*
|
Re: Where to buy a NanoVNA H4 HW rev 4.3?
On Mon, Jan 10, 2022 at 07:28 AM, Dragan Milivojevic wrote:
I'm sure it will.
If you are able to, please post the images of the board.
Thinking about getting one just to see if the changes around
voltage regulators on the 4.3 version are significant compared
to the previous one.
Here is how the PCB layout changed between 4.2 and 4.3 in the power supply area. Roger
|
Re: Where to buy a NanoVNA H4 HW rev 4.3?
On Mon, Jan 10, 2022 at 07:28 AM, Dragan Milivojevic wrote:
I'm sure it will.
If you are able to, please post the images of the board.
Thinking about getting one just to see if the changes around
voltage regulators on the 4.3 version are significant compared
to the previous one.
There were quite a few changes to the voltage regulators from 4.2 to 4.3. Roger
|
Re: automatic loading of a nanovna saver cal file?
On Mon, Jan 10, 2022 at 12:49 PM, chutton12000 wrote:
Can this be done? I have sometimes forgotten to load the file.
Chuck
It automatically loads slot 0 cal data on the most NanoVNA models. IIRC some versions of firmware can recall the last configuration used. Roger
|
automatic loading of a nanovna saver cal file?
Can this be done? I have sometimes forgotten to load the file.
Chuck
|
Re: Where to buy a NanoVNA H4 HW rev 4.3?
Here's a pic of one I got from R&L recently
73
Stan
KM4HQE
toggle quoted message
Show quoted text
On 1/10/22 2:05 PM, Dale - 2W0ODS wrote: On Mon, Jan 10, 2022 at 03:28 PM, Dragan Milivojevic wrote:
I'm sure it will.
If you are able to, please post the images of the board.
Thinking about getting one just to see if the changes around
voltage regulators on the 4.3 version are significant compared
to the previous one. Yes no problem at all I will get some pictures, this is the V4.3 with SI5351, There is another version which is has a MS5351M which is V4.3-MS, but I do not know if that one has other changes.
|
Re: Where to buy a NanoVNA H4 HW rev 4.3?
On Mon, Jan 10, 2022 at 03:28 PM, Dragan Milivojevic wrote:
I'm sure it will.
If you are able to, please post the images of the board.
Thinking about getting one just to see if the changes around
voltage regulators on the 4.3 version are significant compared
to the previous one.
Yes no problem at all I will get some pictures, this is the V4.3 with SI5351, There is another version which is has a MS5351M which is V4.3-MS, but I do not know if that one has other changes.
|
Re: Where to buy a NanoVNA H4 HW rev 4.3?
I'm sure it will.
If you are able to, please post the images of the board.
Thinking about getting one just to see if the changes around
voltage regulators on the 4.3 version are significant compared
to the previous one.
toggle quoted message
Show quoted text
On Mon, 10 Jan 2022 at 15:41, Dale - 2W0ODS <dale.robins@...> wrote: On Sun, Jan 2, 2022 at 03:47 PM, Dragan Milivojevic wrote:
You are right, it is completely different. One is running a part
out of spec, betting on manufacturing tolerances, the other
is relying on the fact that manufacturers relabel chips.
As for clones etc, those that buy at authorised resellers
have no such dilema.
I just received another NanoVNA for the collection, a NanoVNA-H4 Genuine,
V4.3.
And this one came with a STM32F302CBT6, 32Khz clock xtal and also SD Card
slot with cutout.
I'm curious to check this MCU over, I have a genuine ST-Link V2 also Keil
development boards for this series of MCU and some STM discovery boards (I
can easily remove this MCU and solder it there)
I have loaded the latest Hugen/Dislord firmwares and it's working okay, I
hope it stays this way in the future.
|
Locked
Funds for 2022 nanovna-users group annual fee
All,
As I posted before, we have sufficient funds pledged to pay the groups.io fee for 2022.? The response, in under two days, has been overwhelming.
**Further pledges are not necessary**.
We will need to do this every year going forward, so there will be ample opportunity to contribute in the future.
Thanks to everyone who has pledged to support the group.
The next steps for collecting the pledged funds and paying the fee to groups.io will occur starting next week.
DaveD
--
This email has been checked for viruses by Avast antivirus software.
|
Re: Where to buy a NanoVNA H4 HW rev 4.3?
On Sun, Jan 2, 2022 at 03:47 PM, Dragan Milivojevic wrote:
You are right, it is completely different. One is running a part
out of spec, betting on manufacturing tolerances, the other
is relying on the fact that manufacturers relabel chips.
As for clones etc, those that buy at authorised resellers
have no such dilema.
I just received another NanoVNA for the collection, a NanoVNA-H4 Genuine, V4.3. And this one came with a STM32F302CBT6, 32Khz clock xtal and also SD Card slot with cutout. I'm curious to check this MCU over, I have a genuine ST-Link V2 also Keil development boards for this series of MCU and some STM discovery boards (I can easily remove this MCU and solder it there) I have loaded the latest Hugen/Dislord firmwares and it's working okay, I hope it stays this way in the future.
|
Locked
Re: Upcoming payment for this group
I am going to terminate this thread. I will start another one for payment detains in a day or two.
DaveD
toggle quoted message
Show quoted text
On 1/8/2022 12:26 PM, Dave Daniel via groups.io wrote: All,
The annual payment of $220 for this group is due on January 18th. Last year, the co-owners split the fee in half and paid it. This year we are asking for donations from one or more group members.
I can think of two ways for group members to donate.
1. Send donations directly to one of the co-owners (probably me) and when sufficient funds have been collected the co-owner would make the payment to groups.io.
2. Use the groups.io "Donation" facility and ask members to donate directly.
I have some open questions about the groups.io donation feature and have asked them. Also, there are aspects of the Donation facility which I do not like, from privacy and financial account security standpoints.
With respect to the first method listed above, I would be willing to collect donations paid directly to me using PayPal "Friends and Family" up to the $220? and make the payment directly to groups.io. Apart from collecting donations from members, this is what I did last year. If for some reason I were to receive excess funds, the excess would be returned on a LIFO basis.
In any case, we, collectively as a group, will need to come up with the $220. At present, if there are any members who would like to pledge a donation, please send an email to the group owners with the amount that you are willing to pledge. This would allow me to do a bit of planning numbers-wise. As I do not want to lower the S/N ratio of the technical content of the posts, please send any pledges to the owners at [email protected].
Happy New Year, and thank you from the group owners.
DaveD
--
This email has been checked for viruses by Avast antivirus software.
|
Re: New NanoVNA possibly malfunctioning?
Thanks, Larry, that's a nicely written guide.? I didn't know of it and used the nanovna.com web page and some of Alan w2aew's well made videos.? I use RF test equipment nearly daily as part of my job, but am brand new to NanoVNA.? I hoped there were simply some quirks that needed setting right.? I had come across the Clear Config and did that as well, to no avail.? As far as I can tell now, I seem to have a failed unit.? But I'll play with it a little longer just in case.? I very much appreciate the troubleshooting ideas, thanks again!
Mike
toggle quoted message
Show quoted text
On 1/9/22 8:57 PM, Larry Rothman wrote:
Mike,
The Config menu has a system reset (Clear config) in the Expert
Settings.?
You might want to try that then go through the cal process
again.?
If this is the first time you're using a Nanovna, please download
and read the Absolute Beginners guide. It's in the forum files section. It
will walk you through the cal sequence.?
Good luck!
|
Re: New NanoVNA possibly malfunctioning?
Mike,
The Config menu has a system reset (Clear config) in the Expert Settings.?
You might want to try that then go through the cal process again.?
If this is the first time you're using a Nanovna, please download and read the Absolute Beginners guide. It's in the forum files section. It will walk you through the cal sequence.?
Good luck!
On Sun., 9 Jan. 2022 at 7:24 p.m., Mike Markowski<mike.ab3ap@...> wrote: Thanks, Larry.? I did go through the steps you described.? (You can even see in the screenshot from before that I had recalled settings 6.)? After dinner, to be sure, though, I ran through the steps again and suddenly there are no traces at all.? All 4 are turned on and Stimulus -> Pause Sweep is not on.? I reloaded firmware (Dislord v0.69) that the unit came with but no change.? I'm thinking at this point that the unit is at fault and will send it back for a new one.? For the day or so that it worked, I love it and look forward to a replacement to put it to real use.
Thanks again,
Mike
toggle quoted message
Show quoted text
On 1/9/22 5:47 PM, Larry Rothman wrote:
Mike,
When you calibrated the unit, did you hit the Reset softkey
immediately before pressing the Calibrate softkey and then save to a
specific memory slot?
If you saved to a mem slot other than 0, did you
recall that slot after you turned on the unit? All Nanos default to mem
slot 0 at power up.?
Can you check that the Apply box in the Calibrate
menu is checked?
If everything seems ok. Redo the complete calibration
again. I've seen this happen once in a while and recalibration usually
fixes it.?
Cheers
Larry
?
?
? On Sun., 9 Jan. 2022 at 4:41 p.m., Mike
Markowski <mike.ab3ap@...> ( mike.ab3ap@... ) wrote:? There
is a better than even chance that my NanoVNA is fine and I'm the issue.?
However, I started playing with my new unit this weekend and did some
basic things, swept a little telescoping antenna and measured cable
length.
Today, however, the measurements (pic attached, hopefully not
stripped) were from a freshly calibrated NanoVNA running Dislord v1.1.00.?
After a full range cal, then with 50 ohm terminator attached, vswr is
bouncing all over the place.? If I try to calibrate ranges for 140-148 MHz
or 420-450 MHz, vswr shows infinity.
I've handled the vna carefully and
haven't yet tried characterizing filters or anything where'd I'd transmit
into the NanoVNA, so there's no chance of exceeding input limits.? Can
more experienced users say if it sounds there a chance I have a bad unit?
Have I overlooked something beyond reset and re-cal?
Thanks very much,
Mike ab3ap
?
|
Re: Using NanoVNA to measure receive antenna port impedance
#measurement
You cannot just put an arbitrarily-large attenuation after a VNA port and expect reasonable results. Roger Need's suggestion of 20dB is about as high as I would go; keep in mind that the round-trip loss is double the attenuation so the signal quickly becomes uselessly noisy.
And, yes, you can use a noise bridge, BITD there were some high-end ones made commercially.
Best regards.
|
Locked
Re: Upcoming payment for this group
Hello... a suggestion, given the number of active users, could you provide a suggested donation amount...? Thanks...
--
73,
Greg
KC9ZEW
|
Re: New NanoVNA possibly malfunctioning?
Thanks, Larry.? I did go through the steps you described.? (You can even see in the screenshot from before that I had recalled settings 6.)? After dinner, to be sure, though, I ran through the steps again and suddenly there are no traces at all.? All 4 are turned on and Stimulus -> Pause Sweep is not on.? I reloaded firmware (Dislord v0.69) that the unit came with but no change.? I'm thinking at this point that the unit is at fault and will send it back for a new one.? For the day or so that it worked, I love it and look forward to a replacement to put it to real use.
Thanks again,
Mike
toggle quoted message
Show quoted text
On 1/9/22 5:47 PM, Larry Rothman wrote:
Mike,
When you calibrated the unit, did you hit the Reset softkey
immediately before pressing the Calibrate softkey and then save to a
specific memory slot?
If you saved to a mem slot other than 0, did you
recall that slot after you turned on the unit? All Nanos default to mem
slot 0 at power up.?
Can you check that the Apply box in the Calibrate
menu is checked?
If everything seems ok. Redo the complete calibration
again. I've seen this happen once in a while and recalibration usually
fixes it.?
Cheers
Larry
On Sun., 9 Jan. 2022 at 4:41 p.m., Mike
Markowski <mike.ab3ap@...> ( mike.ab3ap@... ) wrote: There
is a better than even chance that my NanoVNA is fine and I'm the issue.?
However, I started playing with my new unit this weekend and did some
basic things, swept a little telescoping antenna and measured cable
length.
Today, however, the measurements (pic attached, hopefully not
stripped) were from a freshly calibrated NanoVNA running Dislord v1.1.00.?
After a full range cal, then with 50 ohm terminator attached, vswr is
bouncing all over the place.? If I try to calibrate ranges for 140-148 MHz
or 420-450 MHz, vswr shows infinity.
I've handled the vna carefully and
haven't yet tried characterizing filters or anything where'd I'd transmit
into the NanoVNA, so there's no chance of exceeding input limits.? Can
more experienced users say if it sounds there a chance I have a bad unit?
Have I overlooked something beyond reset and re-cal?
Thanks very much,
Mike ab3ap
|
Re: Using NanoVNA to measure receive antenna port impedance
#measurement
On 1/9/22 2:40 PM, Jeff Green wrote: Thank you, I was afraid of that.
-------------------
From:
On page 61: "Splitting up the winding into two rings suitably spaced provided a reasonable compromise between simplicity of construction and constancy of antenna input impedance. However, instead of 125 ohm ¡À15% the impedance actually varies from 50 - 300 ohms."
-------------------
So, Any idea how the input impedance is measured and how did Collins verify the above data?
Thank you. You'd measure it (today) with a VNA, making sure that you pick a drive level that's reasonable for the receiver (i.e. if your receiver input can only tolerate -50dBm, then better not put -10 dBm in). The trick is that active devices often have impedances that vary with operating point. Let's assume you know the gain of your receiver very accurately. That is, you've turned off any AGC, and you can measure the output for a given input level.? Then, you can put known impedances in series with the input, forming a voltage divider (Zrcv/(Zrcv + Zseries)), and from a set of measurements, you can determine what Zrcv is. You will need both resistive and reactive series Z, because typically, you can only measure the magnitude of the signal, not the phase.
|
Re: Using NanoVNA to measure receive antenna port impedance
#measurement
On Sun, Jan 9, 2022 at 01:30 PM, Jeff Green wrote:
Goal:
Given my hardware, software, and less then stellar knowledge and skill set, is
it practical to measure the actual antenna input port impedance of several
general coverage receivers?
Jeff, Yes you can measure the input impedance of an HF receiver with your NanoVNA but you need to be careful you do not overload the front end. The output of the NanoVNA is around 0 dBm which is too high. The trick is to lower the NanoVNA output power as much as possible. If you have recent firmware by DiSlord you can set the power level to 2 ma. (which is the lowest possible) but still too high. The next step is to add a 20 dB attenuator to the S11 port and then calibrate with the attenuator in place. The attenuator will lower the signal into the receiver and reduce the dynamic range but you can still get reasonable SWR and RL measurements. The impedance measurement will be reasonable as well if close to 50 ohms. The further away from 50 ohms the worse the accuracy. You will notice that the impedance will change rapidly when you are outside the passband of the receiver front end filters. Roger
|
Re: Using NanoVNA to measure receive antenna port impedance
#measurement
On 1/9/22 12:51 PM, Jeff Green wrote: The Backstory:
The company I work for has been merged via hostile takeover with a nother company and most of the employees are being laid off or offered early retirement. A coworker is relocating to a company in Texas, cleaning out and gave me a year old, unused, Nooelec NanoVNA - Open Hardware Vector Network Analyzer Kit.
The Analyzer kit included SOLT calibration kit.
I downloaded NanoVNASaver.x64 from
I've played with the hardware and software enough to be passably familiar with the process, I used a 75 ohm CATV terminator to produce a 1.5:1 mismatch and the results were what I expected.
Goal:
Given my hardware, software, and less then stellar knowledge and skill set, is it practical to measure the actual antenna input port impedance of several general coverage receivers? It should work ok, but make sure your receiver can tolerate the input power? from CH0.
|
Re: Using NanoVNA to measure receive antenna port impedance
#measurement
Check out W2AEW testing the input of an amp. with a nano: Hope this helps. Richard, K8CYK On Sun, Jan 9, 2022, 3:41 PM Jeff Green <Jeff.L.Green1970@...> wrote: Thank you, I was afraid of that.
-------------------
From:
On page 61: "Splitting up the winding into two rings suitably spaced
provided a reasonable compromise between simplicity of construction and
constancy of antenna input impedance. However, instead of 125 ohm ¡À15% the
impedance actually varies from 50 - 300 ohms."
-------------------
So, Any idea how the input impedance is measured and how did Collins
verify the above data?
Thank you.
|
Roger Need
Mike Markowski
Donald S Brant Jr