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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Show quoted text
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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Show quoted text
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)
|
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
|
Re: Analysing Input Impedance Matching Circuit for the NE602
With my newly wound transformers, 1 to 8 ratio, I now get the following results (see images) when they are placed back to back.
As shown in the S21 plot I am getting a loss of 3 to 6dB
The matching on the smith chart is also pretty far off, at 7.15MHz it is about 27 ohms
I have done the experiment as shown in where I wound 2:5 turns and terminated it in 330 ohms (the page says 470 ohms but when I calculate the secondary impedance with this ratio and 50 ohms on the primary it comes out at just over 300 ohms) - I will put up these results in a separate reply.
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Herb,
I've been waiting for the V2 since I read the outlined specification in fall. My main interests are in 20m, 2m, 70cm bands and I'd like to be able to probe 1.575GHz as well, hence my wait for a 3GHz version. I was willing to risk it for the price and test it myself, but since the situation with the shipping is what it is, I'll most likely get to see the first reviews before I order after all.
Tomas
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I followed the discussion about making BALUNs and the reference to "Beverage Antenna" which was new to me.
With the Google I found the Wikipedia page on it and then the US patent application which will be 100 years old in a few weeks.
Glad I was lurking in and hope others are entertained by seeing the patent.
(F) Lee Erickson
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Re: Analysing Input Impedance Matching Circuit for the NE602
I noted the 73 material good LF material but not so good at over 10 mhz.
When going for odd ratios adding turns sometimes works better.
Or if minor loss is tolerable use a lower ratio and load down to it with
resistor. It can be more predictable as the input admittance of the
ne/sa602 does change with increasing frequency. Use the spec numbers of
1.5K (single ended/3K balanced input, and 3pF plus layour capcitance
across it). Internal capacitance inter- and intra- winding of the transformer
is a factor as well. FYI balanced input doen't not have a bypass cap to ground
from pines 1 or 2 and uses a centertap. So the typical with a 100nf to ground
on pin-2 is single ended 1.5K. Its often confused or at worst never stated.
The 4x50 inductance is rather low and would hopefully be at a frequency below
your extreme bottom frequency. My rule of thumb is 5x or higher and then
do analysis on how the source may interact with that.
Allison
-----------------
No direct email, it goes to bit bucket due address harvesting in groups.IO
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Re: Analysing Input Impedance Matching Circuit for the NE602
First 1 turn is always though both hole there is no .5 turn.
Also if the inductance of the winding is not high enough you get a low
frequency cutoff. Changing the ferrite to higher mu (43 to 73) will help
but more turns would have as well. The reason I removed a bit of a turn (and then called it half a turn) was this seemed to make a better match. Though in reply #11793 I accidentally called it 'one turn' when I meant 'half a turn', this may have caused the confusion. This message should have said 'half a turn' was 7.38uH and 'one turn' was 12.5uH. When I calculated the required inductance needed using Xl = 4 x 50 ohm and then putting the 200 in to L = Xl / (2 x pi x f) I got 4.5uH. With one turn this measures 12uH on my inductance meter but with 'half a turn' it measures 7.38uH which is closer to the calculated value and why I tried removing a half turn to see what would happen. I am currently using a BN-73-202 73 material binocular core for my tests, originally I was using an FT37-43 toroid.
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On Wed, Mar 18, 2020 at 10:32 AM, Roger Need wrote:
It is my understanding that after you do a Clearconfig 1234 you must turn off the power and after turning the power on do a touch calibration and then a calibration with a save to Channel 0.
=============================================================
If "clearconfig" didn't fix your situation then you might try to confirm the calibration is not going wrong when you use the on-screen display. Try performing a calibration using a software package such as Rune's NanoVNA-saver. A cautionary note is that NanoVNA-saver may not be able to properly interface with your unit if it is not properly calibrated.
Other questions you might consider are:
1. Did the device perform properly when you first received it?
2. If so, what firmware revision are you using and have you upgraded since then?
3. If you've upgraded, have you tried a more recent firmware from either edy555 or hugen?
- Herb
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Re: Analysing Input Impedance Matching Circuit for the NE602
I assume you are using insulated wire or you will get shorted
turns due to Mix 73 low resistivity. Does your S21 read close to 0 dB when CH0 is connected to CH1 with the SMA
cables? I was using magnet wire to wind the transformers but have rewound them this afternoon using insulated wire. They now look like the transformer shown in the W8JI link you sent. They are wound 1 to 8 (with one full turn, not a half turn). 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.
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On Wed, Mar 18, 2020 at 10:33 AM, TT7 wrote:
Sadly, they are not shipping to the Czech Republic yet.
===================================================
Tomas,
Probably just as well. There have not been any full reviews from customers who have received a V2, so its not easy to judge if the V2 will meet your needs better than the NanoVNA-F or NanoVNA-H4. Erik received a pre-production unit but has only provided minor details. The price is attractive but you have to also factor in the cost of OSL standards, RF cables, a battery and protective case.
Might be better to wait awhile until the first wave of buyers start posting their reviews on the unit, software and bugs in either.
I already have suitable OSL standards, RF cables, and a battery so it was worth a gamble for me to order the V2 unit. Between the world health crisis and normal transit time from China, I don't expect to receive it until April.
- Herb
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Roger Need
Neal AB6G
