I'm betting it's a mistake also.
toggle quoted message
Show quoted text
On Sunday, September 29, 2019, 06:14:57 PM EDT, mike watts via Groups.Io <wy6k@...> wrote:
I certainly don't need another one, but I couldn't resist!? Wonder if it's a scam or a mistake?? Maybe he meant to make it an auction?
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
? ? On Sunday, September 29, 2019, 4:54:06 PM CDT, James R. Chastain via Groups.Io <suenrod@...> wrote:
I just found this and ordered. Thought others might be interested....
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz-900MHz | eBay
|
|
|
| $20.99 |? |
|
|
|
|? |
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz...
50KHz-300MHz NanoVNA Vector Network Analyzer HF VHF UHF Antenna Analyzer 2.8" TFT Screen. NanoVNA is a compact h...
|
|
|
|
Yep but I's worth a shot since it's with Paypal
toggle quoted message
Show quoted text
On Sunday, September 29, 2019, 06:09:53 PM EDT, Roy Appleton <twelveoclockhigh@...> wrote: Good luck with that! This may be a case of you get what you pay for! Plus the guy has low numbers! Roy WA0YMH On Sun, Sep 29, 2019, 4:54 PM James R. Chastain via Groups.Io <suenrod= [email protected]> wrote: I just found this and ordered. Thought others might be interested....
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen
50KHz-900MHz | eBay
|
|
|
| $20.99 |? |
? |
? |
|
|? |
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz...
50KHz-300MHz NanoVNA Vector Network Analyzer HF VHF UHF Antenna Analyzer
2.8" TFT Screen. NanoVNA is a compact h...
? |
? |
? |
|
On Sun, Sep 29, 2019 at 01:58 PM, Rune Broberg wrote:
Supporting S1P/S2P files would
be an obvious choice, as it seems to be the standardized exchange format;
but if you can find a reference for the format, it might not be too
difficult to implement. :-)
Hi Rune, Here are a few links regarding s1p/s2p file format. From Keysight (more of an outline): Dr. Kirby's Website: I believe NanoVNA-Saver saves the data as HZ and RI format (Real, Imaginary). (I'm attaching an image, so that others can easily see the format) Bo's RFSim example is in MHZ and MA format (Magnitude, Angle). (image attached) A Matlab routine (I downloaded from Matlab Central) with which I drive my 8753C and that stores the data in MHZ and RI format. (image attached) And Dr. Kirby's examples are in MHZ, and DB format (magnitude in dB, Angle) (see his website) So, for me (and my Matlab-generated files), it would be great if you also supported loading and storing files using MHZ in lieu of HZ.. NanoVNA-Saver can already read and save in RI format (I believe). If you were to add the reading of files in DB or MA formats, this would require mathematical conversions. Not difficult, but more code. Also, if loading s2p files, be aware that they will most likely contain S22 and S12 data, in addition to S12 and S11 data, so if you were to support the reading of third-party s2p files (such as the ones I've just described), the software should recognize (i.e. not crash) when these extra fields are present. Anyway, nice features to have, if you can ever find the time! Best regards, - Jeff, k6jca
|
213 of 219 ratings were positive.? I looked, complaints seem to be mostly shipping time.? I've had no real problems with guys like this - over about 1000 transactions.? So I don't shy away from a deal like this.? However, there is a guy listing an FY817 for $250 - he has been a member since January, has 1 transaction, and included no pictures.? I wouldn't touch that - even with a long pole.... :-)
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
toggle quoted message
Show quoted text
On Sunday, September 29, 2019, 5:27:22 PM CDT, Dave Daniel <kc0wjn@...> wrote: 97.3% of 219 transactions is a horrible record. I would never buy sonething from him (but I would look to see what the specific complaints are). DaveD Sent from a small flat thingy On Sep 29, 2019, at 18:20, mike watts via Groups.Io <wy6k@...> wrote:
He has 219 transactions, has already sold 39 of these, and 97.3% positive feedback.? Those are not bad numbers.? But, like you say, we will see...
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
? ? On Sunday, September 29, 2019, 5:09:53 PM CDT, Roy Appleton <twelveoclockhigh@...> wrote:
Good luck with that! This may be a case of you get what you pay for! Plus
the guy has low numbers!
Roy
WA0YMH
On Sun, Sep 29, 2019, 4:54 PM James R. Chastain via Groups.Io <suenrod=
[email protected]> wrote:
I just found this and ordered. Thought others might be interested....
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen
50KHz-900MHz | eBay
|
|
|
| $20.99 |? |
? |
? |
|
|? |
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz...
50KHz-300MHz NanoVNA Vector Network Analyzer HF VHF UHF Antenna Analyzer
2.8" TFT Screen. NanoVNA is a compact h...
? |
? |
? |
|
I look at those numbers entirely differently! I see ONLY 219 and I see his rating already dropped down to 97%! If I wanted to beat the competition I'd price it at say $35. I'll bet IF this comes as a working unit it'll be without battery, cables, etc! OR you got a helluva deal! :-)) On Sun, Sep 29, 2019, 5:21 PM mike watts via Groups.Io <wy6k= [email protected]> wrote: He has 219 transactions, has already sold 39 of these, and 97.3% positive
feedback. Those are not bad numbers. But, like you say, we will see...
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin'
the resistance, through the rain and through the night..."
On Sunday, September 29, 2019, 5:09:53 PM CDT, Roy Appleton <
twelveoclockhigh@...> wrote:
Good luck with that! This may be a case of you get what you pay for! Plus
the guy has low numbers!
Roy
WA0YMH
On Sun, Sep 29, 2019, 4:54 PM James R. Chastain via Groups.Io <suenrod=
[email protected]> wrote:
I just found this and ordered. Thought others might be interested....
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen
50KHz-900MHz | eBay
|
|
|
| $20.99 | |
|
|
|
| |
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz...
50KHz-300MHz NanoVNA Vector Network Analyzer HF VHF UHF Antenna Analyzer
2.8" TFT Screen. NanoVNA is a compact h...
|
|
|
|
Re: NanoVNA V2 - I vote for a larger instrument...
Nothing wrong with "N" Types, But how about TNC... According to Amphenol and RS good from DC - 11Ghz. And a better size for small VNAs. Paul
|
97.3% of 219 transactions is a horrible record. I would never buy sonething from him (but I would look to see what the specific complaints are).
DaveD
Sent from a small flat thingy
toggle quoted message
Show quoted text
On Sep 29, 2019, at 18:20, mike watts via Groups.Io <wy6k@...> wrote:
He has 219 transactions, has already sold 39 of these, and 97.3% positive feedback. Those are not bad numbers. But, like you say, we will see...
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
On Sunday, September 29, 2019, 5:09:53 PM CDT, Roy Appleton <twelveoclockhigh@...> wrote:
Good luck with that! This may be a case of you get what you pay for! Plus
the guy has low numbers!
Roy
WA0YMH
On Sun, Sep 29, 2019, 4:54 PM James R. Chastain via Groups.Io <suenrod=
[email protected]> wrote:
I just found this and ordered. Thought others might be interested....
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen
50KHz-900MHz | eBay
|
|
|
| $20.99 | |
|
|
|
| |
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz...
50KHz-300MHz NanoVNA Vector Network Analyzer HF VHF UHF Antenna Analyzer
2.8" TFT Screen. NanoVNA is a compact h...
|
|
|
|
Re: NanoVNA V2 - I vote for a larger instrument...
Perhaps the solution is a tablet that run nanoVNAsaver. Larger screen, reasonable touch sensitivity so we don't have to sharpen finger. (Ran a finger into table saw 10 years ago: don't recommend it)
Just received my nanoVNA yesterday. Scrambling around looking for connectors and adaptors. My immediate goal is to measure components/filters.
Awesome little device.
Mark Walter
|
He has 219 transactions, has already sold 39 of these, and 97.3% positive feedback.? Those are not bad numbers.? ?But, like you say, we will see...
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
toggle quoted message
Show quoted text
On Sunday, September 29, 2019, 5:09:53 PM CDT, Roy Appleton <twelveoclockhigh@...> wrote: Good luck with that! This may be a case of you get what you pay for! Plus the guy has low numbers! Roy WA0YMH On Sun, Sep 29, 2019, 4:54 PM James R. Chastain via Groups.Io <suenrod= [email protected]> wrote: I just found this and ordered. Thought others might be interested....
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen
50KHz-900MHz | eBay
|
|
|
| $20.99 |? |
? |
? |
|
|? |
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz...
50KHz-300MHz NanoVNA Vector Network Analyzer HF VHF UHF Antenna Analyzer
2.8" TFT Screen. NanoVNA is a compact h...
? |
? |
? |
|
Re: Another modified nanoVNA software
Hi Gyula,
After entering the cable VF, say '66' for 0.66, wait for the selection file dialog to appear, and then select your s1p file.
======
To other members who ask to try the software, please check your emails.
neb
|
I certainly don't need another one, but I couldn't resist!? Wonder if it's a scam or a mistake?? Maybe he meant to make it an auction?
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
toggle quoted message
Show quoted text
On Sunday, September 29, 2019, 4:54:06 PM CDT, James R. Chastain via Groups.Io <suenrod@...> wrote:
I just found this and ordered. Thought others might be interested....
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz-900MHz | eBay
|
|
|
| $20.99 |? |
|
|
|
|? |
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz...
50KHz-300MHz NanoVNA Vector Network Analyzer HF VHF UHF Antenna Analyzer 2.8" TFT Screen. NanoVNA is a compact h...
|
|
|
|
Good luck with that! This may be a case of you get what you pay for! Plus the guy has low numbers! Roy WA0YMH On Sun, Sep 29, 2019, 4:54 PM James R. Chastain via Groups.Io <suenrod= [email protected]> wrote: I just found this and ordered. Thought others might be interested....
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen
50KHz-900MHz | eBay
|
|
|
| $20.99 | |
|
|
|
| |
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz...
50KHz-300MHz NanoVNA Vector Network Analyzer HF VHF UHF Antenna Analyzer
2.8" TFT Screen. NanoVNA is a compact h...
|
|
|
|
Re: NanoVNA V2 - I vote for a larger instrument...
By the way, for my needs, I would like an instrument that goes from 100 kHz to at lease 1 GHz. Burt, K6OQK At 02:20 PM 9/29/2019, you wrote: Once again, I vote for a larger version. As I said earlier, I would like one to be tablet size and with Type-N connectors. I suspect that I'd probably be willing to pay a fair price for a larger, more robust instrument. I typically use my RF test equipment of this type in the field, rarely if ever up a tower, often at the tower base, not so much on the bench. I want something I can easily see and use a touch screen that works with real fingers, not fingers I have to first stick in a pencil sharpener.
The idea of using the nanoVNA in conjunction with a phone for a larger screen or a tablet for a tablet size screen does not appeal to me. For me, a VNA is a tool, not a project - making an antenna work properly is the project.
Burt, K6OQK
At 01:37 PM 9/29/2019, you wrote:
In my opinion, it could be a bit larger with a larger screen and still be fine for portable or field use.? Just look at the Keysight Field Fox...
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
On Sunday, September 29, 2019, 3:22:33 PM CDT, Bo, OZ2M <groups.io@...> wrote:
Hi
Personally I am not at all sensitive to the form factor. My use is 99% lab use and 1% antenna/portable use.
I wonder how many actually wants a small form factor.
Bo
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
biwa@...
K6OQK
--
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, CA U.S.A.
K6OQK
Burt I. Weiner Associates Broadcast Technical Services Glendale, California U.S.A. biwa@... K6OQK -- Burt I. Weiner Associates Broadcast Technical Services Glendale, CA? U.S.A. K6OQK
|
Re: NanoVNA usable as spectrum analyzer?. Yes, if you know what you are doing
This is an interesting topic.? How would I hook it up to use it as a spectrum analyzer?? Run the signal into the CH0 and kook at logmag?
Mike WY6K
"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."
toggle quoted message
Show quoted text
On Sunday, September 29, 2019, 4:32:47 PM CDT, franciscm@... <franciscm@...> wrote:
Hello again Eric and other possible readers. I received my nanoVNA a couple of weeks ago and I have been doing many tests with it.
First I must say my unit came without shields and I added them, but there was no considerable improvement in the base noise level.
The second thing I am going to say is that I have been trying to check the operation of the CH1 input as a spectrum analyzer and I have been able see under what circumstances it is more or less usable.
First, the level measurements appear to be around 15 dB higher than the signal applied below 300 MHz and around 20 dB higher? about this frequency. I assume that it is because the nanoVNA accepts as 0dB the value applied in its CH1 in the calibration, which is that provided by CH0 and has those values ??(in the measurement frequency). Known that offset, is not a major problem.
Secondly, below 1MHz of span two peaks appear instead of one, as the image frequency also appears separated twice the value of the IF (i.e. 10KHz). In a "real" spectrum analyzer this image frequency is separated at several GHz and is rejected by the input LPF. Of the two peaks, the "real" is the higher frequency (the one on the right).
The third problem I have appreciated is that to be
recognized, the signal must fall exactly on any of the sampled frequencies because otherwise it is strongly or completely attenuated. Properly choosing the span this inconvenience is soslayable. This makes signals with a significant frequency modulation look very bad on the screen. This contributes to the low refresh rate, which also prevents an AM signal from being displayed correctly and as an extreme case a telegraphic signal.
As a summary of the above, to say that the signal of an RF generator without modulation is looked and measured "good" but "practical" signals (the carriers alone do not serve much in real life) look bad.
Greetings and forgiveness for the extension and possible-probable inaccuracies and bad english.
Javier Muriedas EA1AWY
|
I just found this and ordered. Thought others might be interested....
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz-900MHz | eBay
|
|
|
| $20.99 | |
|
|
|
| |
NanoVNA Vector Network Analyzer HF VHF UHF Antenna 2.8" TFT Screen 50KHz...
50KHz-300MHz NanoVNA Vector Network Analyzer HF VHF UHF Antenna Analyzer 2.8" TFT Screen. NanoVNA is a compact h...
|
|
|
|
Here is an overview of the xaVNA:
|
Re: Cal-Kit Standards' Definitions
Dr. David Kirkby from Kirkby Microwave Ltd
On Sun, 29 Sep 2019 at 22:00, Kurt Poulsen <kurt@...> wrote: Hi David
One detail if I may. It is not possible to use the R&S T-Check software it
requires the NanoVNA are able to do a full 10/12term error correction..
Sorry
Kind regards
Kurt I was unaware that it could not do that, but it doesn¡¯t change the fact you can use T-checker or airlines on another VNA, or perhaps the external software for the NanoVNA. I am sure I will learn more about this little device when I finally get it boxed up with decent switches, USB connector and RF connectors. Otherwise I know that I will damage it. ???? Dave. -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 01621-680100./ +44 1621 680100 Registered in England & Wales, company number 08914892. Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
|
ST-Link V2 (Re: [nanovna-users] NanoVNA bricked)
un-necessarily ordered the ST Programmer.
In case you are now weighing the momentous decision whether you invest in one or not, I recommend to get a couple of these: At $1.92 per piece shipped, they won¡¯t break the bank, and it is good to have a couple lying around as insurance. Buy them now before you find out you need them :-) (Yes, these things work. The only trap for newcomers is that they incredibly come in two different pinouts, so if you make your own cable, make sure you read the description on the unit.) Gr¨¹?e, Carsten
|
Re: Another modified nanoVNA software
Hi neb,
I tried to use the program and the .s2p made by others cannot display (works with nanovna saver) and using the TDR function I don't know how it works. I don't know what to load after typing%.
Gyula
|
Re: NanoVNA usable as spectrum analyzer?. Yes, if you know what you are doing
Hello again Eric and other possible readers. I received my nanoVNA a couple of weeks ago and I have been doing many tests with it.
First I must say my unit came without shields and I added them, but there was no considerable improvement in the base noise level.
The second thing I am going to say is that I have been trying to check the operation of the CH1 input as a spectrum analyzer and I have been able see under what circumstances it is more or less usable.
First, the level measurements appear to be around 15 dB higher than the signal applied below 300 MHz and around 20 dB higher to over this frequency. I assume that it is because the nanoVNA accepts as 0dB the value applied in its CH1 in the calibration, which is that provided by CH0 and has those values ??(in the measurement frequency). Known that offset, is not a major problem.
Secondly, below 1MHz of span two peaks appear instead of one, as the image frequency also appears separated twice the value of the IF (i.e. 10KHz). In a "real" spectrum analyzer this image frequency is separated at several GHz and is rejected by the input LPF. Of the two peaks, the "real" is the higher frequency (the one on the right).
The third problem I have appreciated is that to be
recognized, the signal must fall exactly on any of the sampled frequencies because otherwise it is strongly or completely attenuated. Properly choosing the span this inconvenience is soslayable. This makes signals with a significant frequency modulation look very bad on the screen. This contributes to the low refresh rate, which also prevents an AM signal from being displayed correctly and as an extreme case a telegraphic signal.
As a summary of the above, to say that the signal of an RF generator without modulation is looked and measured "good" but "practical" signals (the carriers alone do not serve much in real life) look bad.
Greetings and forgiveness for the extension and possible-probable inaccuracies and bad english.
Javier Muriedas EA1AWY
|
WY6K Mike Watts
Burt K6OQK
Gyula Molnar