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@....
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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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An Android phone can be used also, it has a bigger screen that can be watched very well outdoors.
Ignacio EB4APL
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El 14/05/2020 a las 21:19, Oristo escribi¨®: The NanoVNA is great indoors, especially used with a PC or android.
But it's nearly impossible for me to see and read it outdoors, at my antenna location. An LCD viewfinder works:
--
El software de antivirus Avast ha analizado este correo electr¨®nico en busca de virus.
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Re: External Down/Up converters for NanoVNA/2/SDR
Gus,
Yes, it works, and phase is preserved if you use the same source for both the mix up and the mix down.
I tried a quick test with a NanoVNA-V2 and a couple of ZFM-4300 mixers. The NanoVNA-V2 swept 100 MHz to 900 MHz, and a 1 GHz LO mixed up and down to create a sweep from 1100 MHz to 1900 MHz. A tunable band pass filter responded as expected in that range, and the phase through the filter was stable. There was 12 dB or so of added loss from the mixers,
The biggest spurious responses were from the images, of course, with some minor responses due to limited RF-IF rejection of the mixers. You would want some filtering to limit the signals to your band of interest.
(I chose the frequencies to match the items I had on hand, but it should all scale up to 5 GHz)
--John Gord
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On Thu, May 14, 2020 at 03:46 PM, Gus Osborne wrote:
Hello all,
Think this is my first OP here - have a couple questions/thoughts I¡¯d like
to run by the group.
I¡¯ve ordered a couple of the SUP2400 satellite upconverters, with the
intention of modifying one to act as a 2.4Ghz down converter, like here:
I know this should work for my RX only SDR purposes (possibly even TX with
BladeRF) - but was also wondering about the feasibility of connecting one of
these modified ¡°downconverters¡± to CH1 on the S-A-A-2 (using an external
antenna and possibly some preamplification) in order to reach the 5.8Ghz band
for a ¡°poor mans¡± spectrum analysis tool. The primary use would be for
conducting quick and dirty site surveys.
My other thought, possibly even stranger - was using one in its default
configuration on CH0 to upconvert the tracking gen signal by 2.4Ghz (through a
DUT/bridge), then using the modified downconverter to receive output on CH1
for typical analysis. I¡¯m sure all bets would be off when it comes to phase
and possibly impedance.
Does anyone see an obvious reason this shouldn¡¯t work for simple purposes? I
understand it won¡¯t work nearly as well as a purpose built device; but will
it work? I¡¯m hoping the SAA2¡¯s usable 3.5Ghz + a 2.4Ghz conversion will
put me right were I need to be, for (somewhat crude) 5.2-5.8Ghz analysis.
Thoughts..?
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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?
R&L is where I got mine as well. I believe they are reselling the NanoVNA-H
and NanoVNA-H4 from Hugen; they come in the gift boxes. It's about the same
price as ordering a single unit delivered from China and you get it faster.
Presumably R&L is making its money by ordering 100 at a time and reselling
single units -- which is exactly what a dealer DOES so I'm fine with that.
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On Fri, May 15, 2020 at 12:39 AM W2DWL <w2dwl@...> wrote: I got mine from R&L Electronics, and had it in 4 days.Sent via the Samsung
Galaxy S10, an AT&T 5G Evolution capable smartphone
-------- Original message --------From: Robert Cloutier <
rob_cloutier@...> Date: 5/14/20 23:44 (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? How much did you pay for
it?WO4ROB________________________________From: [email protected] <
[email protected]> on behalf of Clif Holland <clif@...>Sent:
Thursday, May 14, 2020 12:24:29 PMTo: [email protected] <
[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?I bought a NanaVNA-H4 from outstandingdeal
on Ebay. Genuine article in Gold lettered box. Received it in 4 days. No
problems what-so-ever.
|
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 got mine from R&L Electronics, and had it in 4 days.Sent via the Samsung Galaxy S10, an AT&T 5G Evolution capable smartphone
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-------- Original message --------From: Robert Cloutier <rob_cloutier@...> Date: 5/14/20 23:44 (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? How much did you pay for it?WO4ROB________________________________From: [email protected] < [email protected]> on behalf of Clif Holland <clif@...>Sent: Thursday, May 14, 2020 12:24:29 PMTo: [email protected] < [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?I bought a NanaVNA-H4 from outstandingdeal on Ebay. Genuine article in Gold lettered box. Received it in 4 days. No problems what-so-ever.
|
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?
How much did you pay for it? WO4ROB ________________________________ From: [email protected] < [email protected]> on behalf of Clif Holland <clif@...> Sent: Thursday, May 14, 2020 12:24:29 PM To: [email protected] < [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? I bought a NanaVNA-H4 from outstandingdeal on Ebay. Genuine article in Gold lettered box. Received it in 4 days. No problems what-so-ever.
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Re: External Down/Up converters for NanoVNA/2/SDR
I don't know of any reason why you couldn't do that. Might take a little tweaking and fooling with, but that shouldn't stop you. Go for it. Let us know how it works out.
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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 definitely see pinned topics in other groups - perhaps a recently added feature?
|
External Down/Up converters for NanoVNA/2/SDR
Hello all,
Think this is my first OP here - have a couple questions/thoughts I¡¯d like to run by the group.
I¡¯ve ordered a couple of the SUP2400 satellite upconverters, with the intention of modifying one to act as a 2.4Ghz down converter, like here:
I know this should work for my RX only SDR purposes (possibly even TX with BladeRF) - but was also wondering about the feasibility of connecting one of these modified ¡°downconverters¡± to CH1 on the S-A-A-2 (using an external antenna and possibly some preamplification) in order to reach the 5.8Ghz band for a ¡°poor mans¡± spectrum analysis tool. The primary use would be for conducting quick and dirty site surveys.
My other thought, possibly even stranger - was using one in its default configuration on CH0 to upconvert the tracking gen signal by 2.4Ghz (through a DUT/bridge), then using the modified downconverter to receive output on CH1 for typical analysis. I¡¯m sure all bets would be off when it comes to phase and possibly impedance.
Does anyone see an obvious reason this shouldn¡¯t work for simple purposes? I understand it won¡¯t work nearly as well as a purpose built device; but will it work? I¡¯m hoping the SAA2¡¯s usable 3.5Ghz + a 2.4Ghz conversion will put me right were I need to be, for (somewhat crude) 5.2-5.8Ghz analysis. Thoughts..?
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Re: Different NanoVNA models
On Thu, May 14, 2020 at 07:01 AM, <namerati@...> wrote:
Thanks. It's rather annoying that I have to log in to access it.
Many groups are closed and you have to login to read any of the messages. This group lets you read messages and if you are interested you can join and perhaps contribute to the group. Considering all the work that went into the Wiki I don't think it is asking too much to join and login to view it... Roger
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I use a cardboard box large enough to get my head into. It blocks the
sunlight enough to be able to read and operate the Nano.
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On Thu, May 14, 2020 at 12:07 PM DougVL <K8RFTradio@...> wrote: Great thread!
I have an MFJ-207, an MFJ-259(no letter), a Mini60 bluetooth, and an early
NanoVNA (received in October, 2019).
The NanoVNA is great indoors, especially used with a PC or android. But
it's nearly impossible for me to see and read it outdoors, at my antenna
location. I hope very much to get the NanoVNA-F, but with so many other
instruments already on hand, the priority is a bit low.
For new users trying to choose between an "analyzer" and a NanoVNA, I'd
say that the Nano is cheap enough that you should get both! If you decide
you don't like one, it shouldn't be hard at all to resell it, maybe on eBay
or the QTH.com classifieds.
Doug, K8RFT
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Randy.AB9GO
Shirley Dulcey KE1L
Jim Allyn - N7JA
Roger Need