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Re: New NanoVNA-H just received
So is the 3.4 version currently available the order and what is the link to
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Alibaba? Roy WA0YMH On Fri, Dec 27, 2019, 4:29 PM hwalker <herbwalker2476@...> wrote:
On Fri, Dec 27, 2019 at 01:44 PM, David Eckhardt wrote: |
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Re: New NanoVNA-H just received
On Fri, Dec 27, 2019 at 01:44 PM, David Eckhardt wrote:
So, am I to understand the NANOVNA-H tops out at 1.5 GHz? If so, what is the noise floor on an s11 measurement at 1.42 GHz? ================================================================== Dave, I think it is generally accepted that s11 return loss values less that 30 dB are the high water mark. On my NanoVNA-H I have a return loss of at least 30 dB up to about 1.3 GHZ. From there it falls off rapidly to 20 dB at 1.5 GHz. Actually, above 1 GHz, I only treat measurements as indicative, but still better than other equipment I currently own. I have not seen any performance reviews of the new ver 3.4 NanoVNA-H, but hugen says additional noise level improvement have been made. I believe erik has been part of that conversation. - Herb |
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Re: New NanoVNA-H just received
On Fri, Dec 27, 2019 at 01:32 PM, BruceN wrote:
¡ Am I missing something? I didn't a USB-C termination resistors. Maybe I don't know what I'm looking at..... ================================================ Bruce, You are not missing anything. Like the diode for battery level monitoring, the termination resistors are installed on-board and enable reliable usb-c to usb-c device connection (primarily NanoVNA-H to cellphone). That is the reason for the additional usb-c to usb-c cable in the accessory kit. - Herb |
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Re: Wait for V2 design or but current model on ebay?
On Fri, Dec 27, 2019 at 01:21 PM, <nanovnagroup@...> wrote:
If I understood correctly some of the posts seem to suggest that he sells through Alibaba, which I am not a fan of as among other things they usually don't take Paypal and there are basically no reliable shipping options to the US besides DHL which is much more expensive. ========================================================================= Yes, hugen's official store is: . Ordering from that store is pretty much the only way you can ensure your NanoVNA-H has the version 3.4 PCB installed unless your third party seller is technically savvy or willing to open the case and check (doubtful). I haven't ordered from Alibaba because, like you, I would rather use PayPal than give out my credit card. I also don't like the added postal charges for expedient delivery. In some cases, there is even an unexpected sales tax added to the charge. You can chat with Maggie King at the Alibaba link I referenced earlier and ask if she can recommend a third party supplier of ver 3.4 NanoVNA-H's on eBay. - Herb |
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Re: New NanoVNA-H just received
So, am I to understand the NANOVNA-H tops out at 1.5 GHz? If so, what is
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the noise floor on an s11 measurement at 1.42 GHz? Dave - W?LEV On Fri, Dec 27, 2019 at 9:32 PM BruceN <k4tql@...> wrote:
Herb, --
*Dave - W?LEV* *Just Let Darwin Work* *Just Think* |
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Re: New NanoVNA-H just received
Herb,
Am I missing something? I didn't a USB-C termination resistors. Maybe I don't know what I'm looking at. I thought about waiting for the new version too. But, I didn't want to wait. And I'm glad I didn't. Don't know what the newer version would have done for me anyway. The "old" version is probably way beyond my capabilities anyway. BruceN -- *"To invent, you need a good imagination and a pile of junk"* -- Thomas Alva Edison (1847-1931) |
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Re: Brief NanoVNA-H vs NanoVNA_F comparison
#nanovna-f
I started this topic because I advised my ham club that in purchasing the NanoVNA-F they would be getting the same NanoVNA-H unit that some of our members have embraced, but with a larger screen, case, and bigger battery. We approved its purchase over additional NanoVNA-H's for our youth group. When the NanoVNA-F arrived I didn't realize how far behind the NanoVNA-H it was in terms of firmware enhancements, and also surprised that errors such as the 0.4dB s21 offset after OSLT calibration was just being reported by some users.
My hope was to give other group members information that I didn't have when I made my recommendation. I hope this topic continues in that vein and not veer off topic regarding Dr. Kirby's popularity. I only brought that incident up to point out that this group was created by a user for users, and is widely open to discussion. Whereas the NanoVNA-F group was created by the manufacturer and; therefore, has not enjoyed the same user contribution to documentation, NanoVNA-F specific software, and firmware that the NanoVNA-H has. In retrospect, I would have advised holding off on the purchase until the promised NanoVNA-F firmware enhancements have been delivered and shaken out, or wait for Gabriel's 3GHZ offering with larger display option. - Herb |
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Re: Wait for V2 design or but current model on ebay?
Hi Herb,
Thanks for the heads up, I have sent a question to the seller about the PCB version. Does hugen have an ebay store? If I understood correctly some of the posts seem to suggest that he sells through Alibaba, which I am not a fan of as among other things they usually don't take Paypal and there are basically no reliable shipping options to the US besides DHL which is much more expensive. As you said, I always had a positive experience on ebay purchases even if something went wrong with the purchased item or the seller tried to pull one. Not so on Amazon or many other places I would not even show my CC from 10 ft away as it is common sense nowadays trying to avoid to directly disclose your payment info as much as possible to organizations with doubtful or unknown safe data handling practices. Too many links in the chain. Thanks again. |
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Re: New NanoVNA-H just received
On Fri, Dec 27, 2019 at 10:57 AM, BruceN wrote:
¡ A satisfied buyer and, no, I don't own any stock in Hugen's store. ========================================================================== Bruce, I also purchased the new hugen NanoVNA-H version with case and additional accessories, and second your opinion. The added value of the case, already installed battery monitoring diode, usb-c termination resistors, upgraded firmware (1500 MHz extension, DFU menu, TDR menu, etc.) and additional accessories (didn't even realize the "included guitar pick with lanyard " was actually a useful stylus) is more than worth the slightly higher cost that the old version is selling for. My only regret is ordering before the new version 3.4 PCB was announced. I guess I'll wait for performance reviews of the new 3.4 version before deciding to purchase it or wait for Gabriel's 3GHz version. Either way, I'm having more fun than I deserve. - Herb |
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Re: New NanoVNA-H just received
Oh, and I found out how to open the case; there are 4 screws on the back cover. Duh!
An another neat feature I just found searching the box: a wrist strap that you can use to keep the instrument from falling out or your hand while you use it. Now to tune things up with nanosaver. BruceN / K4TQL A satisfied buyer and, no, I don't own any stock in Hugen's store. -- *"To invent, you need a good imagination and a pile of junk"* -- Thomas Alva Edison (1847-1931) |
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New NanoVNA-H just received
I just received a new nanoVNA-H that I bought from Hugen. And, man, am I impressed. I'm comparing it against clone I got from another source (which has been classified at the worst of the clones). The difference is like night an day. Hugen's came via DHL in a little over 7 days (I ordered it just before the weekend). The instrument itself was packaged in a neat storage box which was then foam wrapped and placed in an outer corrugated container. It was then sent in a DHL envelope. Arrived in fine shape with no damage.
It came with two short coax cables with SMA male connectors each end. The calibration standards and a SMA - SMD female connector. It also came with TWO usb cables, one USB-C mini (micro?) and one USB-A to USB-C mini (micro?). Most of the clones come with only one USB cable if you get that. Powering it on and checking the version shows that it has the latest of Hugen's code. Oh, did I say the this instrument is enclosed in a case? Yup. None of the clones seem to have one and you'll pay 12 or 13 dollars for an aftermarket case. That's a bargain right there. It came with a memory structure map printed on glossy paper. Most of the clones come with nothing. I might also mention that the battery diode is already installed. No need to open the case to install one like you do on most of the clones. The only issue I might find is how to open the case if you have to put it in DFU mode to load new software. But, of course, you can select DFU mode from the CONFIG menu. If you DO have to open the case, how to do it isn't intuitive but, then, I hope I don't have to do that; I'll cross that bridge when I come to it. I paid $50 for the clone which came foam wrapped in an envelope and shipped via slow boat from China. I paid $60 for Hugen's from his store (Alibaba) which came DHL in about 7 days. Whyin'ell would anyone want to pay $50 for a beat up Ford when you can buy the Cadillac express delivered for $60? I don't know, but I've learned my lesson. Gonna go have fun now. BruceN / K4TQL -- *"To invent, you need a good imagination and a pile of junk"* -- Thomas Alva Edison (1847-1931) |
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Re: Brief NanoVNA-H vs NanoVNA_F comparison
#nanovna-f
You are entitled to your opinion of course. But I would like to know who you actually are? On this occasion I do not totally agree with you. I am sure that you don't reside at Bag End so who are you? How do we know that you are not a business rival?
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David does make excellent cal kits and is very knowledgeable, I think his agenda is to try and stop people getting carried away with what these products we are discussing actually are. Convenient, cheap, remarkable value for money. However they are not professional pieces of equipment and have short comings. That seems to be David's agenda, he seems to put the brakes on and try to stop folklore becoming fact. That is a useful contribution in my opinion. Obnoxious and over bearing? At times, yes! Regards Conrad Farlow, PA5Y -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Bilbo via Groups.Io Sent: 27 December 2019 18:44 To: [email protected] Subject: Re: [nanovna-users] Brief NanoVNA-H vs NanoVNA_F comparison #nanovna-f He wasn't just banned because his criticising the connectors, he was banned also because of his obnoxious and overbearing posts.He seems to have his own agenda besides shamelessly promoting his own business. I often wondered why he had not been banned for good long before that episode. -Bilbo |
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Re: quick measuring cable characteristic wave resistance
I experimented with this Lambda/8 method using the program TLD (transmission Line Details) and got within .4 ohms of the cable impedance after doing a number of different tests. TLD contains the characteristics of many kinds of cables and calculates input impedance at various frequencies/line lengths based on a user input load impedance.
TLD is a free program and is available here >>> . Highly recommended |
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Re: Brief NanoVNA-H vs NanoVNA_F comparison
#nanovna-f
He wasn't just banned because his criticising the connectors, he was banned also because of his obnoxious and overbearing posts.He seems to have his own agenda besides shamelessly promoting his own business.
I often wondered why he had not been banned for good long before that episode. -Bilbo |
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Re: Plate RF Choke Measurements
#measurement
Yes, agree.
I will re visit this and with another choke as I need one in the input, grid side of the amp. 73' Alan |
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Re: quick measuring cable characteristic wave resistance
Hi,
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wave-theory of open transmission-line (Z_l = inf) is Z = -jZ_line*cot(beta*len_line). If the line has a length of the line is labda/8 this gives cot(pi/4), which is one. Thus we have Z = -j*ZLine | lengh_line = labda/8 And we have just the wave-impdenace of the line left in the equation. Correct me, if I'm mistaken here please, but sounds like a clever idea :) Best Regards, Martin Am Fr., 27. Dez. 2019 um 16:49 Uhr schrieb Corneliu via Groups.Io <coralenka@...>: Hi Hans, |
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Re: Wait for V2 design or but current model on ebay?
On Fri, Dec 27, 2019 at 06:34 AM, <nanovnagroup@...> wrote:
¡.. I chose this listing as the seller seemed to have overall good feedback rating, and the unit seems to include all the accessories and the ABS housing, and everything seems to be neatly organized inside a nice case. ¡.. =================================================================== The packaging and included accessories are indicative of the current hugen NanoVNA-H model. The positive feedback rating, total number of sales, and reasonable delivery time make the eBay seller seem pretty safe. I've never had a problem getting my money returned on eBay if the purchase turned out to be a scam. About the only other consideration I can think of is hugen has made some worthwhile improvements which he has included in Version 3.4 of his PCB. If you order from his official store your NanoVNA-H will have the ver 3.4 PCB installed. If you order from eBay or elsewhere there is no guarantee which version PCB will be installed. - Herb |
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Re: quick measuring cable characteristic wave resistance
Hi Hans,
Thank you vm for for sharing your method with us. I do not know which is the explanation behind this method but I can confirm it is working very well. I have 2 pieces of professional made high quality 50 ohm cables about 38 cm long and they both measured 50 ohms +/- 0.1 ohms. The cables supplied with nanoVna measured 53.7 and 55.2 Ohms respectively. Thank you very much! Merry Christmas! 73! de YO4AUL |
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Re: Plate RF Choke Measurements
#measurement
Hi Alan,
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thank you for the info. I think it is a good thing to save the measurement files, they are taking very little space and can be re-analyzed in the future with various software tools. Also can be used as reference for future measurements of the same DUT, to see any modifications. Actually I wanted to look at other graphs, for example S11 R and X, more comfortable for me to see resonances. I totally agree the choke should be measured in place. For S11 measurement of course no shorting is needed, both ends are connected to CH0. For GDO like measurement, shorting is needed to close the circuit. It would be interesting to compare S11 measurements with GDO and also with NanoVNA in GDO mode (small coupling coil on CH0). 73 Ady On Fri, Dec 27, 2019 at 12:08 PM alan victor <avictor73@...> wrote:
Hi Ady. |
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Re: First PCB pictures of the V2
I am new to this group and this is only my second post. I am happy to have found this specific thread as I was going to order what looks like one of the latest units of the original design NanoVNA (V1?) unit on ebay (it seems an "-H" release, as I have now recently learned to recognize that last letter has a meaning). But now after following this thread and seeing that good progress is apparently being made it seems it would be a good idea to hold and wait for this newer and much improved version to get released. I am in RF engineering mainly focused on 2-way radio systems design and commissioning, and having a portable tool that does so much and that still fits in a shirt pocket instead of lugging around bulky equipment would have sounded almost like SciFi only a few years ago (HP35 ~analogy intended).
But if I still decide to go ahead and make the purchase of the other unit (after all its only $47), and as I do not wish to unintentionally detract this thread from the original subject, I started a new one to ask for comments about the unit I am considering buying on ebay to make sure it is the real deal: /g/nanovna-users/topic/wait_for_v2_design_or_but/69286381?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,69286381 Thank you. Alex |
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