Re: External Down/Up converters for NanoVNA/2/SDR
Just did the test Two mixers rated for 2GHz-4GHz with IF ports 10MHz-2GHz Connect the nanoVNA CH0 and CH1 to the IF ports, LO ports together to a generator at 2350MHz. Filter to measure connected to RF ports nanoVNA span 100MHz to 300MHz Filter is 2.5GHZ to 2.6GHz S21 loss through mixers only 13dB I would have expected some leakage through the connected LO ports but nothing visible Loads of dynamic range , easy to check the filter. Works much better than I expected. This is also a good approach to measure the performance of the up conversion to 1st IF, the 1st IF filter and the downconversion to second IF (just before the 2nd IF filter) of a dual conversion front-end such as used in a spectrum analyzer or general coverage receiver. Temporarily set the 2nd IF to zero Hz and the nanoVNA can do the measurement. -- NanoVNA Wiki: /g/nanovna-users/wiki/homeNanoVNA Files: /g/nanovna-users/filesErik, PD0EK
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Re: Are any of the NanoVNA sold on Amazon any better or worse than any others? Is there a better U.S. site to order from?
I paid 60.00 with tax and shipping from R&L electronics.?Sent via the Samsung Galaxy S10, an AT&T 5G Evolution capable smartphone
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-------- Original message --------From: Clif Holland <clif@...> Date: 5/16/20 09:23 (GMT-05:00) To: [email protected] Subject: Re: [nanovna-users] Are any of the NanoVNA sold on Amazon any better or worse than any others? Is there a better U.S. site to order from? The "H4" was $75 plus tax, free shipping
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Re: Are any of the NanoVNA sold on Amazon any better or worse than any others? Is there a better U.S. site to order from?
The "H4" was $75 plus tax, free shipping
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Re: Down Load from the NANOVNA
Backup firmware to computer /g/nanovna-users/topic/backup_firmware_to_computer/74035302?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,20,74035302
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Re: Down Load from the NANOVNA
The DefuSe utility is used to upload and download the flash from the Nano.?
On Fri, 15 May 2020 at 8:07 PM, w3wte<g.laser@...> wrote: Hi Group,
Is their a way to download the settings I have created in the NANOVNA to a computer?? I have one version of the firmware loaded and calibrated. I would like to down load that version to the computer, Then up load a different firmware, set it up and save it as lets say "MY 136 MC". Possibly several versions saved that I could individually up load to the NAOVNA, for different tests. If possible just point me in a direction, and I will try to figure out.
Thanks, Glenn W3WTE
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Re: External Down/Up converters for NanoVNA/2/SDR
Check out the convertors designed for the HP8924 series like the 83236B which converted the PCS band 1.8 GHz to the cellular band (850 MHZ)
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Down Load from the NANOVNA
Hi Group,
Is their a way to download the settings I have created in the NANOVNA to a computer? I have one version of the firmware loaded and calibrated. I would like to down load that version to the computer, Then up load a different firmware, set it up and save it as lets say "MY 136 MC". Possibly several versions saved that I could individually up load to the NAOVNA, for different tests. If possible just point me in a direction, and I will try to figure out.
Thanks, Glenn W3WTE
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I agree with Mike. Many of the others are knock-offs and may not be supported.
?___
Sent from my two way wrist watch
73 de W3AB/GEO?
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On May 15, 2020, 15:38, at 15:38, Michael Docy <mdocy@...> wrote: Yes herb. You are correct that none of them are "official".
I guess my point was that if you get the NanoVNA-F from the aliexpress
/ Deepelec store
you will be guaranteed to get the actual BH5HNU unit, not a clone.
The BH5HNU unit is favored by me because of his dedication to improve
the software and support
his customers.
73, Mike
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Yes herb. You are correct that none of them are "official".
I guess my point was that if you get the NanoVNA-F from the aliexpress / Deepelec store
you will be guaranteed to get the actual BH5HNU unit, not a clone.
The BH5HNU unit is favored by me because of his dedication to improve the software and support
his customers.
73, Mike
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Re: S-A-A-2 Firmware & Software Releases
I received my NANONVA about a week ago. I have been able to analyze antennae and cables. it has a white benzel and appears to have earlier firmware. Is there a 1,2,3... procedure to upgrading the firmware? I have spent several days reading, downloading and, deciphering. I still do not have a download...
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Re: Are any of the NanoVNA sold on Amazon any better or worse than any others? Is there a better U.S. site to order from?
I just left R&L after picking my new nano vna up. They are running a
special on them today for $39.95. Since I get the digest I'm not sure that
somebody has brought this up but I would almost bet they have.
I talked to one of the fellows on the way out and he told me they must have
sold 65 of them today. They couldn't figure out why they were so popular
today and I told them of this news group and the thread.
The special is good until midnight EDT when the new special will
automatically pop up.
randy.ab9go@....
This message sent to you from my mobile device via speech-to-text
technology.
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On Fri, May 15, 2020 at 01:36 PM, <m1dgq1@...> wrote:
... some explanation of what you see on the screen and what you expect to see would be good ...
============================================
From a terminal program if you enter "data 0" ( CH0 s11 values), or "data 1" (CH1 s21 values) you will receive 101 complex data pairs in real/imaginary format from the NanoVNA for CH0 or CH1, respectively. The 101 real/imaginary data points represent the 101 display points on the NanoVNA. All measurements displayed by the NanoVNA, or shown by any NanoVNA software program are derived from the complex data pairs values.
For example:
If s = the complex s21 data values returned by "data 1" (i.e. 0.365322053 -0.903783857)
then:
20*log10(abs(s)) is equal to the CH1 LOGMAG value displayed on the NanoVNA
similarly:
if a = angle(s) CH1 angle in radians
then:
rad2deg(a) is equal to the CH1 PHASE value displayed on the NanoVNA
All other displayed values are likewise derived from the base complex data pair and their formulas can be found on the internet, or by looking at how an open source program like NanoVNA-Saver calculates them.
- Herb
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Have you looked at the Wikipedia article on the Smith chart?:
It has a lot of math, but it also gives a description of how a given impedance (resistance + capacitive or inductive reactance) gives different measured values with different lengths of transmission line (coax, etc.) between the measuring device and the device being measured. Some values change with line length, some (like VSWR or return loss) don't change (much). If you are generally familiar with AC circuits involving inductance and capacitance, the Smith Chart can help understand how impedance varies along a transmission line, and the VNA is a tool that actually does those measurements over a range of frequencies.
For understanding impedance in general, you could look at old versions of the ARRL Handbook which can be found online.
--John Gord
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On Fri, May 15, 2020 at 01:36 PM, <m1dgq1@...> wrote:
i Have asked this before but my post seems to have been lost.
From experience and being taught i now what to expect as a result for a return
loss measurement .
From experience and being taught i know what to expect as a result for a vswr
measurement.
These are common knowledge results but has anyone put together a list of
expected results that are good for any of the other measurements we can do .As
a noob to vna's i am finding i get results but what are good and what are bad.
some explanation of what you see on the screen and what you expect to see
would be good but every video i have watched does not go into that detail they
expect you to know that answer. well I've got to be taught it first to know
it. anyone willing to teach an old dog new tricks?
or at least point me to some where i can read with out loads of maths that i
do not understand. I need a bit of spoon feeding of what i see on the screen
in relation to the maths or vice verse.
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Where are you located?
Alan
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On Fri, May 15, 2020 at 10:19 AM, Michael Docy wrote:
... I did some research. The only official NanoVNA-F is from developer BH5HNU at Deepelec. He has not
released the pcb to the public ...
=======================================
Michael for clarification,
BH5HNU hasn't claimed that deepelec's NanoVNA-F is the official version, only that deepelec is the "official store" for its versions 2.3 and 3.1 NanoVNA-F products. BH5HNU was previously employed as a NanoVNA-F designer at SYSJOINT. He left because of differences with them. SYSJOINT can lay claim as the official store for its version 2.5 NanoVNA-F, which of course BH5HNU helped produce and adheres to the original open source design.
There are bad clones of the NanoVNA-F on the market which have deviated from the original design. Those bad clones generally do not have metal cases or the massive battery of the original NanoVNA-F. BH5HNU has not called the NanoVNA-F ver 2.5 product from SYSJOINT a clone or bad product.
The new 2.3 and 3.1 NanoVNA-F from BH5HNU at the deepelec store have upped the ante and, in my opinion, given BH5HNU a completive advantage over SYSJOINT. Additionally, BH5HNU has continued to release firmware updates for the NanoVNA-F which SYSJOINT has not done.
- Herb
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i Have asked this before but my post seems to have been lost.
From experience and being taught i now what to expect as a result for a return loss measurement .
From experience and being taught i know what to expect as a result for a vswr measurement.
These are common knowledge results but has anyone put together a list of expected results that are good for any of the other measurements we can do .As a noob to vna's i am finding i get results but what are good and what are bad.
some explanation of what you see on the screen and what you expect to see would be good but every video i have watched does not go into that detail they expect you to know that answer. well I've got to be taught it first to know it. anyone willing to teach an old dog new tricks?
or at least point me to some where i can read with out loads of maths that i do not understand. I need a bit of spoon feeding of what i see on the screen in relation to the maths or vice verse.
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Re: External Down/Up converters for NanoVNA/2/SDR
Gus,
Yes, a single LO split to run both mixers. (And the mixers were ZEM-4300, not ZFM. Poor memory. You would want something else for 5 GHz anyway.)
--John
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On Fri, May 15, 2020 at 06:59 AM, Gus Osborne wrote:
Excellent - Thank you guys!
I will certainly post some results and pictures once I get them going.
Considering these converters cost ~$5-10 each, I figured there wasn¡¯t much
to lose.
John,
When you say same source, I¡¯m assuming you mean sharing a single LO for both
mixers, to preserve phase?
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I had the same question as Russell C. Nixon and I did some research. The only official NanoVNA-F is from developer BH5HNU at Deepelec. He has not released the pcb to the public so every other NanoVNA-F is a clone and may or may not operate the same. The official product has a graphic donut-shaped hole in the letter "A". Not a solid circle or line. /g/nanovna-f/wiki/19943/g/nanovna-f/topic/sales_and_products_q_a/72587097?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,72587097 From the NanoVNA-F group: "There is only one official store now : If there's any problem with ordering on Aliexpress, see here : /g/nanovna-f/wiki/Sale-issuesIf you don't want to make orders on Aliexpress, but still want to support the developer BH5HNU and Deepelec company. Make sure your package comes with Packing box. There's a trademark an eagle & words "DEEPELEC". " Also from nanoVNA-F group: "There are many NanoVNA-F clones on the market, they are usually crude and lack of after-sales guarantee. When these clones reach the customer, there is a great possibility that they will not be used normally. We have never publicly released NanoVNA-F hardware. NanoVNA-F clones may not work properly with our latest firmware, and there are many potential problems, such as inaccurate measuring result and so on. We are not responsible for problems encountered when using cloned products. Therefore, in order to reduce unnecessary troubles, please purchase genuine NanoVNA-F."
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Re: External Down/Up converters for NanoVNA/2/SDR
Excellent - Thank you guys!
I will certainly post some results and pictures once I get them going. Considering these converters cost ~$5-10 each, I figured there wasn¡¯t much to lose.
John,
When you say same source, I¡¯m assuming you mean sharing a single LO for both mixers, to preserve phase?
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Re: Are any of the NanoVNA sold on Amazon any better or worse than any others? Is there a better U.S. site to order from?
Interesting - maybe the forum owners can implement this if it's not a paid feature.
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On Thursday, May 14, 2020, 8:32:27 p.m. GMT-4, Gus Osborne <gusosborne@...> wrote:
I definitely see pinned topics in other groups - perhaps a recently added feature?
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GEO BADGER
Randy.AB9GO