Re: Wich one the get ? nanoVNA F or H4
On Thu, Mar 19, 2020 at 02:44 AM, <mcebokli@...> wrote:
What about the new SAA2? Any practical eperience yet? On paper it's much better than either F or H4.
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The key word is "on paper". Since no user reviews have yet appeared, its hard to make an informed opinion. The performance specifications look good but other factors such as included accessories (standards, cables, battery & case), software and product support need to be considered.
My ham club bought a $1000 KC901S network analyzer a couple years back. On paper it is much better than the -F or -H4 but its lack of software and product support equalize the playing field. The -F and -H4 are in constant use by our members, whereas the KC901S is only used for occasional measurements above 2 GHz.
- Herb
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Received NanoVNA from Tindie yesterday. Delivery to Russia took 9 days.
Everything is working, PC software too.
Unfortunately calibration kit is not included - i'am going to buy it separately.
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On Wed, Mar 18, 2020 at 11:42 PM, Dave wrote:
? I just got a shipment of boards from JLCPCB that were shipped last Saturday.
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Are you intending on stuffing and soldering the boards yourself? Not something the average enthusiast would undertake.
- Herb
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Re: Analysing Input Impedance Matching Circuit for the NE602
(there's aboslutely no need to get on the 50 ohm mark precisely, but that's another discussion) Thanks for highlighting this, it is good to know I do not need to be super precise with this - I have kind of got distracted from making my current radio to seeing if I could actually get a really good match from 50 to 3k ohm even if I do not really need to. Before I got my NanoVNA I just used to guess and try until I got a good result but now I can actually measure these things it is really interesting to experiment. I think learning about doing this and trying in practise will prove quite useful which is why I have been spending lots of time experimenting. All the feedback I have been getting has been extremely helpful, so once again thank you, I really appreciate it.
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On Wed, Mar 18, 2020 at 08:08 PM, Hern¨¢n Freschi wrote:
Nanovna-saver seems to show a flat line.
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If NanoVNA-saver is giving you a correct calibration then your NanoVNA is operating correctly. The difference between its guided calibration and your manual calibration is you are using the touch screen to input each standard.
1. If you still have the protective film on your NanoVNA, remove it as it may interfere with the touchscreen input.
2. Re-check and save your touchscreen calibration, then repeat your OSLT calibration (If the touchscreen cal is off your inputs may not register correctly).
3. When you perform your OSLT calibration ensure you wait a couple of sweeps for the trace to settle between selecting each standard.
If you calibrate the unit above 100 MHz and try to use it a low frequencies the results will be indeterminate because there are no calibration points in that range. If you intend to use the NanoVNA at low frequencies perform a calibration including those frequencies for best performance.
Good luck.
- Herb
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Re: Analysing Input Impedance Matching Circuit for the NE602
Thank you very much for your suggestions - I really appreciate them and have learnt a lot from reading about the various ideas people have offered and from doing my experiments.
I have just re-done the CH0 to CH1 return loss test using a different set of cables and have got better results, the image is attached. Using these cables the return loss is -53dB at 1MHz and -33dB at 30MHz so pretty close to those shown by Roger and Arie.
I need to use my other cables though for testing as these have non-sma ends on that allow me to attach to the transformers. By non-sma ends I mean short wires but I assume (hopefully correctly) that at low frequencies (7Mhz) this should not make too much difference.
My next step is to attach my new transformers to the NE602 and see how the output looks.
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Re: Analysing Input Impedance Matching Circuit for the NE602
For my nanoVNA version H3.2? I measured Returnloss on CH1: -55dB on 1 MHz, and -33dB on 30 MHz.
More than good enough for measurements on those transformers.
Have you ever tried your VNA measurements on receivers sweeping the bands like 160m, 80m, 40m?
You will be amazed how good the termination of CH1 of the nanoVNA is compared to receiver frontends. (there's aboslutely no need to get on the 50 ohm mark precisely, but that's another discussion)
73,
Arie PA3A
Op 19-3-2020 om 02:18 schreef Roger Need via Groups.Io:
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On Wed, Mar 18, 2020 at 12:19 PM, Kerr Smith wrote:
I have attached two images to this reply, one shows the S21 gain and the other
the S11 return loss when CH0 is directly connected to CH1. I calibrated my NanoVNA to the same frequency range as you. Then connected CH0 to CH1. Here are the plots of S21 and S11. My S21 is flat like yours but your S11 does not seem that good. This might be due to the termination impedance on your CH1.
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Re: Wich one the get ? nanoVNA F or H4
What about the new SAA2? Any practical eperience yet? On paper it's much better than either F or H4.
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Your ship confirmation from Tindie should have included a tracking number (in my case, of the form LW...9 digits...CN). This form of tracking number is accepted by usps.com (which in my case shows Pre-Shipment Origin Post is Preparing Shipment) and by 17track.net (which in my case shows, translated by google translate, as below.) In a nutshell, my device has been in status "Shanghai, Airline Carrier" for 6 days now, since 13 March. The tracking information on 17track.net is in chinese, however, I had no difficulty copying the text into translate.google.com.
Hope this helps. I do wish Tindie had offered DHL service (which has worked well for me for small parcels from Hong Kong/China for quite some time) or comparable, but there was only one ship option given when I ordered (day the device appeared on tindie.)
73 Dave WB0GAZ wb0gaz@...
(here is the translated result from URL (substitute your tracking number here))
Origin-Tracking consuming: 64 ms
2020-03-13 11:07
Shanghai, Airline Carrier
2020-03-12 22:15
Shanghai, arrived at [Shanghai International Mail Exchange Station] (via transit)
2020-03-11 21:40
Nanjing, leave [Nanjing International Swap Bureau], next stop [Nanjing Station]
2020-03-11 15:47
Nanjing City, [Nanjing International Swap Bureau] has been exported directly sealed
2020-03-10 20:32
Nanjing, leave [Nanjing International Branch], next stop [Nanjing International Branch]
2020-03-10 18:23
Nanjing City, [Nanjing International Branch] has received, investment staff: lttj01, phone: 17705192970
2020-03-08 23:01
Logistics order has been created
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Neal:
? I just got a shipment of boards from JLCPCB that were shipped last Saturday.
Dave - WB6DHW
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On 3/18/2020 3:42 PM, Neal Pollack wrote: Are NanoVNA V2 shipments still able to leave China? I ordered one a week ago on Tindie, but then it occurred to me
that flights and ship may not be allowed to land at USA. Does anyone know real news about shipping status from
China to USA? I am hopping that my paid order does not sit on the docks until September :-(
Neal
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Nanovna-saver seems to show a flat line.
1. I'm not sure now. I never noticed this before, because I always used this at over 100MHz. The problem appears when the sweep starts at low frequencies.
2. I upgraded, but I'm not sure what the original firmware was. It was the one that came with the device. The PCB say NANOVNA-H 3.2 but the firmware was NANOVNA. It didn't have a D2 diode. I tried with the latest available versions of NanoVNA and NanoVNA-H. Both give the same problem
3. I tried the latest. Should I downgrade?
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Re: NanoVNA for CB radio tuning
So glad I posted on here before I even got the NanoVNA. I was definitely going to try and run it in-line like a SWR meter as seen in videos and such, but now will not. : )
Many thanks to you all for your warnings and advise.
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Re: Analysing Input Impedance Matching Circuit for the NE602
On Wed, Mar 18, 2020 at 12:19 PM, Kerr Smith wrote: I have attached two images to this reply, one shows the S21 gain and the other
the S11 return loss when CH0 is directly connected to CH1. I calibrated my NanoVNA to the same frequency range as you. Then connected CH0 to CH1. Here are the plots of S21 and S11. My S21 is flat like yours but your S11 does not seem that good. This might be due to the termination impedance on your CH1.
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Re: NanoVNA for CB radio tuning
Reach out to me at jjgalway@... and I will walk you through setup?
On Wed, Mar 18, 2020 at 18:19, zfanibanda@...<zfanibanda@...> wrote: Hi all,
As the title says, I may be way in over my head here....
That being said, I'd like to learn more.
I bought a NanoVNA after I read a few subreddit posts saying I'd get the best bang for my buck if I got a NanoVNA instead of a standard SWR meter(for the same price) used for tuning CB radios. After all, who's going to pass up a deal like that? I was then pointed here to get more info on the NanoVNA and have been befuddled since. I have gone through the Wiki and the Files, downloaded the NanoVNASaver and android app. I have a basic idea on how to get the device to show me the SWR reading, but the progress stops there for me. I also did a topic search for CB radio and CB, but came up pretty empty-handed.
I recently purchased a Midland 75-822(1) and an external antenna(2) and would love to learn how to use this device to make sure I'm tuned in to the best possible setting. I've seen folks tune the CB radios using a standard SWR meter, but I feel there are a few more steps involved when using the Nano. Both the radio and the antenna are sporting a PL-259 connection, which off the bat, won't work with the Nano. So I went out and bought a set of connectors(3) to hopefully match up with the antenna, radio, and Nano. I am a total newbie to the radio world, but willing to learn. Feel free to let me know I should back out now, while I still have some money left. But I¡¯d really like to learn more about this tool and how I can go about helping others get the best tuning out of their setups as well.
Thank you for taking the time to read this monstrosity,
Z
(1)
(2)
(3)
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Re: NanoVNA for CB radio tuning
Being a CB'er I must email you a *HUGE CAUTION*, since you are learning
about the NANOVNA:
*UNDER NO CIRCUMSTANCES CONNECT THE NANOVNA TO THE RADIO AND KEY THE
MICROPHONE. Better yet, don't E V E R CONNECT IT TO THE TRANSCEIVER.
*
Doing so and keying the microphone will immediately destroy the NANOVNA!!!
The NANO, however, is good for looking at SWR on CB antennas both at the
antenna and at the end of the feedline to the antenna.
Dave
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Re: NanoVNA for CB radio tuning
Well, there is a WARNING before you start burning things:
Contrary to a SWR meter, the nanoVNA can not be used with the transmitter and cannot be left online while using the radio, as a SWR meter is normally used. It has his own RF source for measuring the antenna (and a lot of other things), so you first measure your antenna connected only to the nanoVNA and when you are satisfied with it, disconnect the nanoVNA and connect the radio to the antenna.
The way to measure the antenna is explained in the manual, presentations and YouTube videos.
Best regards,
Ignacio
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El 19/03/2020 a las 0:19, zfanibanda@... escribi¨®: Hi all,
As the title says, I may be way in over my head here....
That being said, I'd like to learn more.
I bought a NanoVNA after I read a few subreddit posts saying I'd get the best bang for my buck if I got a NanoVNA instead of a standard SWR meter(for the same price) used for tuning CB radios. After all, who's going to pass up a deal like that? I was then pointed here to get more info on the NanoVNA and have been befuddled since. I have gone through the Wiki and the Files, downloaded the NanoVNASaver and android app. I have a basic idea on how to get the device to show me the SWR reading, but the progress stops there for me. I also did a topic search for CB radio and CB, but came up pretty empty-handed.
I recently purchased a Midland 75-822(1) and an external antenna(2) and would love to learn how to use this device to make sure I'm tuned in to the best possible setting. I've seen folks tune the CB radios using a standard SWR meter, but I feel there are a few more steps involved when using the Nano. Both the radio and the antenna are sporting a PL-259 connection, which off the bat, won't work with the Nano. So I went out and bought a set of connectors(3) to hopefully match up with the antenna, radio, and Nano. I am a total newbie to the radio world, but willing to learn. Feel free to let me know I should back out now, while I still have some money left. But I¡¯d really like to learn more about this tool and how I can go about helping others get the best tuning out of their setups as well.
Thank you for taking the time to read this monstrosity,
Z
(1)
(2)
(3)
--
El software de antivirus Avast ha analizado este correo electr¨®nico en busca de virus.
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Re: Analysing Input Impedance Matching Circuit for the NE602
For my final tests this evening I put a programmable resistor board on the secondary of the 1 to 8 transformer and tried lots of different resistances to see if I could see what the matching resistance was but I could not get close to the center of the smith chart.
As a final test I again pulled out half the primary turn and tried again - this time I got a better match at 7.15MHz with a 3k ohm load. The VSWR is 1.23 to 1, the return loss is -20dB, the smith chart is a bit off at 61 ohms though.
So far it seems I can only get a good match with half the primary turn removed, if I have a full turn I can not get a match at all.
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NanoVNA for CB radio tuning
Hi all,
As the title says, I may be way in over my head here....
That being said, I'd like to learn more.
I bought a NanoVNA after I read a few subreddit posts saying I'd get the best bang for my buck if I got a NanoVNA instead of a standard SWR meter(for the same price) used for tuning CB radios. After all, who's going to pass up a deal like that? I was then pointed here to get more info on the NanoVNA and have been befuddled since. I have gone through the Wiki and the Files, downloaded the NanoVNASaver and android app. I have a basic idea on how to get the device to show me the SWR reading, but the progress stops there for me. I also did a topic search for CB radio and CB, but came up pretty empty-handed.
I recently purchased a Midland 75-822(1) and an external antenna(2) and would love to learn how to use this device to make sure I'm tuned in to the best possible setting. I've seen folks tune the CB radios using a standard SWR meter, but I feel there are a few more steps involved when using the Nano. Both the radio and the antenna are sporting a PL-259 connection, which off the bat, won't work with the Nano. So I went out and bought a set of connectors(3) to hopefully match up with the antenna, radio, and Nano. I am a total newbie to the radio world, but willing to learn. Feel free to let me know I should back out now, while I still have some money left. But I¡¯d really like to learn more about this tool and how I can go about helping others get the best tuning out of their setups as well.
Thank you for taking the time to read this monstrosity,
Z
(1)
(2)
(3)
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Re: Analysing Input Impedance Matching Circuit for the NE602
As mentioned above I wound a 2 to 5 ratio on a BN-73-202 core and terminated the secondary in 330 ohms - this appears to show a pretty good match. The return loss is below -30dB at 7.15MHz and the VSWR is 1.06 to 1. The smith chart also shows a good match as it is very close to the 50 ohm point.
I think I need to adjust the ratios on my windings a bit to try and get similar results for a 3k ohm match.
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Are NanoVNA V2 shipments still able to leave China? I ordered one a week ago on Tindie, but then it occurred to me
that flights and ship may not be allowed to land at USA. Does anyone know real news about shipping status from
China to USA? I am hopping that my paid order does not sit on the docks until September :-(
Neal
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Arie Kleingeld PA3A
Roger Need
Neal AB6G