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Re: V2 and V3 roadmap
This being a VNA (not a spectrum analyzer),
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the only frequency present in the network is assumed to be that of the signal injected by the VNA. So I doubt "resolution bandwidth" applies. Harmonics of the injected signal due to non-linearities in the network should not be an issue. Anyways, having ignored this forum for most of the year, I hadn't see this thread. OwO's initial post looks very promising: /g/nanovna-users/message/15871 ############################ Here are the designs under way and future plans for VNA hardware improvements: - V2-N - this is still 2.8 inch and will replace the V2, and will feature 2x faster sweep (200 points/s) and lower trace noise. It will be ready in 1 month. - V2-N4 - this one is 4 inch, and will have up to 5x faster sweep (500 points/s). It will be a redesign and won't be simply V2 with a large display substituted in. Estimated availability in 2 months. Some of our engineers are now working for another company on a new product lineup: - A USB-only 4GHz VNA with fast sweep. ETA 3 months. Pricing is supposed to beat the V1 NanoVNA. - A USB-only 6GHz VNA with fast sweep. ETA 3 months. Pricing is supposed to beat the V2. - A full two port 3GHz VNA with 100dB dynamic range across the band. I don't know if this will feature a display. ############################# When I buy a VNA with a display in the future, I'll be looking for a 4", Though beyond a GHz, any network or antenna will fit comfortably on the edge of my desk, so fine with me if the VNA is tied to a linux laptop (or perhaps an android phone?). For a 6GHz instrument, it seems we're moving beyond what most hobbyists need. Pricing it north of $100 may not affect volumes much. If the instrument is locked down (not open source), but the protocol over the USB port is revealed, that allows the open source community to create nanovna-saver type software to extend the capabilities. Hans over at qrp-labs.com has made a business of mostly open source hardware, his QSX (I'm confident it will show up someday!) will use this strategy to discourage clones. I'm hoping these instruments can find a home with a US distributor. Perhaps somebody in the forum could run a shop out of their garage if nothing else. Jerry, KE7ER On Fri, Aug 21, 2020 at 10:14 PM, <necessaryevil86@...> wrote:
Any idea what the resolution bandwith will be? Or Am I asking to much now? |
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Re: Use of Velocity Factor in nanoVNA
You will need to use the transform function.
On Sat, Aug 22, 2020, 10:17 AM Piero Tognolatti <piero.tognolatti@...> wrote: Doug, |
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Re: Use of Velocity Factor in nanoVNA
Doug,
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I was looking for any length indication on the screen, but I didn't find it.? I just saw time, no lengths. Piero, I0KPT Il 22/08/2020 13:51, DougVL ha scritto:
I believe that the VF is used to determine the cable length. The VNA can measure the time for the reflected pulse, and use that with the VF to calculate length. There is probably a length also shown on the screen. |
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Re: Question about measuring an antenna with the nanovna-h
I should add, if the physical size of the vna is comparable to the physical size of the antenna under test, the affect of the vna is significant. On the other hand, for example, I measured a 40 meter dipole 10 feet above ground. It was ~ 67 feet in length and flat. An NVIS antenna. The vna was clipped onto the dipole center arm and the affect of holding it is nil. The resonance of the antenna was obvious as well the swr spot on. Since I was standing at the antenna I was in the near field. However, at 6 Foot 7... I am physically small compared to 67 feet!
Alan |
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Re: Question about measuring an antenna with the nanovna-h
On 8/21/20 10:59 PM, C Gosch via groups.io wrote:
Hi all, I'm assuming small changes, not huge gyrations. totally to be expected - What frequency were you working at? How long is the coax from the antenna and how far are you from the antenna. For virtually all antennas, the coax (and anything connected to it) becomes part of the antenna, unless you've been very careful with chokes and layout. let's say you're measuring something like a FM broadcast band (88-108 MHz) antenna and it's sitting on a stand - how does the feedline get to the antenna? Is it perfectly perpendicular and symmetrically placed? Probably not - so some of the fields from the antenna couple to the feedline, travel along the outside of the feedline to the VNA. And you. Are you standing/sitting within a few wavelengths of the antenna? In any direction, not just the "beam" direction if any - You're in the near field. Is the NanoVNA within that distance? It's in the near field. If you're getting large changes in apparent |S11|, especially when you move it - then I'd look at loose or damaged connectors, cracked PCBs, things like that. It's always good to test your test setup - take the antenna off and put a load on instead, and see what happens. Or a short/open. None of them should radiate to any significant degree, so if your readings change with a load on the end of the cable, then something is going on. |
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Re: Question about measuring an antenna with the nanovna-h
There are several message threads about this. Since you have not grounded the Nanovna, you are part of the antenna system and where and how you hold the device will change its readings.?
Search for: antenna near field /g/nanovna-users/message/5796?p=,,,100,0,0,0::Created,,+field+antenna,100,2,0,37711267 On Sat, 22 Aug 2020 at 8:10 AM, C Gosch via groups.io<ch.gosch@...> wrote: Hi all, I'm new to the nanovna and VNAs in general. I got a nanoVNA-H4 recently and was playing with measuring a few antennas (SWR and reactance) to find my way around. I noticed that the measurement was depending very much on where the VNA was located, and where my hands were located relative to the VNA. I expected that to be true for the antennas themselves, i.e. when I touch the antenna or come close to it, measurements will change. But the measurements were e.g. changing extremely when I put my hand on the side of the nanovna opposite from the SMA connectors. Is that expected behaviour? Is there some form of shielding in the enclosure? I got the device from a reputable dealer in the US who was claiming these are "validated to be good production models"? (whatever that means). Any hints? |
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Question about measuring an antenna with the nanovna-h
Hi all,
I'm new to the nanovna and VNAs in general. I got a nanoVNA-H4 recently and was playing with measuring a few antennas (SWR and reactance) to find my way around. I noticed that the measurement was depending very much on where the VNA was located, and where my hands were located relative to the VNA. I expected that to be true for the antennas themselves, i.e. when I touch the antenna or come close to it, measurements will change. But the measurements were e.g. changing extremely when I put my hand on the side of the nanovna opposite from the SMA connectors. Is that expected behaviour? Is there some form of shielding in the enclosure? I got the device from a reputable dealer in the US who was claiming these are "validated to be good production models" (whatever that means). Any hints? |
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Re: Use of Velocity Factor in nanoVNA
I believe that the VF is used to determine the cable length. The VNA can measure the time for the reflected pulse, and use that with the VF to calculate length. There is probably a length also shown on the screen.
Enter the VF without the leading decimal point - if the VF is 0.67 (or 67%), just enter 67. Doug, K8RFT |
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Re: Quick Questions
THX Larry, appreciate the response, very helpful. I¡¯ll go forward with the upgrade.
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......Ted On Aug 21, 2020, at 6:43 PM, Larry Rothman <nlroth@...> wrote: |
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Re: Quick Questions
Welcome to the forum, Ted.?
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The Nanovna and Nanovna H use the same firmware. The Nanovna H4 uses different firmware that is not compatible with the previous 2 due to its larger display and different processor.? Please practice using DeFuSe to install FW on your unit. You cannot brick the Nanovna...if an upload fails, just start again.? Edy556's FW is stable as is hugen's FW.? Only install DiSlord's FW if you're looking at experimenting with his releases.? Read at least one or more user guides found in the files section and review the forum's wiki for useful info.? ... Larry On Fri, 21 Aug 2020 at 8:24 PM, Ted Chesley<tedchesley@...> wrote:
??? Hi Guys (and Gals) Newby here with a couple questions: ??? Just got a new NanoVNA-H4 from Amazon and am working my way into gaining a bit of proficiency with it. I notice that the firmware is somewhat dated considering the rapid development curve. Ver info on my unit is below: ??? 11) Looking through the site I note the latest edy555 firmware upgrade is ver 0.8.0 released 6-19-20. Is this compatible with the H4 version? Upgrades since my ver 0.5.0 encompass many of the features being discussed now so I figure it is wise to upgrade. ??? 22) I let my computers auto install the drivers for both my WIN 7 machine STM ver 1.3.1.0, and WIN 10 laptop MS USB Serial Device ver 10.0.18362.1. Both seem to interface OK with NanoVNA-Server 3.40. STM site says upgrade ver STM-32102 doesn't work with WIN 10 but to use the "in Box" version which I am assuming is the windows embedded driver as noted above. ??? So far I am most impressed with the advanced capabilities of this very (unbelievably) economical unit, providing measurement capability typically far beyond the range of the average techs budget. If I had any up front observations, I would suggest some real world thought to ruggedize the unit for field use. Such as in the use of metal enclosures or at least frames to connect the SMA connections to a solid support rather than the delicate PCB connections. ??? °Õ³ó²¹²Ô°ì²õ¡¡¡¡¡..°Õ±ð»å |
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Quick Questions
Hi Guys (and Gals) Newby here with a couple questions:
Just got a new NanoVNA-H4 from Amazon and am working my way into gaining a bit of proficiency with it. I notice that the firmware is somewhat dated considering the rapid development curve. Ver info on my unit is below: 11) Looking through the site I note the latest edy555 firmware upgrade is ver 0.8.0 released 6-19-20. Is this compatible with the H4 version? Upgrades since my ver 0.5.0 encompass many of the features being discussed now so I figure it is wise to upgrade. 22) I let my computers auto install the drivers for both my WIN 7 machine STM ver 1.3.1.0, and WIN 10 laptop MS USB Serial Device ver 10.0.18362.1. Both seem to interface OK with NanoVNA-Server 3.40. STM site says upgrade ver STM-32102 doesn't work with WIN 10 but to use the "in Box" version which I am assuming is the windows embedded driver as noted above. So far I am most impressed with the advanced capabilities of this very (unbelievably) economical unit, providing measurement capability typically far beyond the range of the average techs budget. If I had any up front observations, I would suggest some real world thought to ruggedize the unit for field use. Such as in the use of metal enclosures or at least frames to connect the SMA connections to a solid support rather than the delicate PCB connections. °Õ³ó²¹²Ô°ì²õ¡¡¡¡¡..°Õ±ð»å |
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Re: About S-A-A-2 clones
Hello OwO,
Friday, August 21, 2020 EEVBlog is a very widely read public forum that has 450.000 members, this forum has just over 7,000! I wouldn't post something sensitive on EEVBlog that I wouldn't expect a great many many people to read, with all due respect. In fact I wouldn't post anything sensitive at all on the internet that I wouldn't want written in perpetuity ;) Once it's out there, it's out there, as many have found out to their chagrin. Best regards, Chris mailto:chris@... O> So, I do not want this to be a name and shame, so please don't speculate O> on who the mentioned people are. EEVBlog forums is a small forum and O> there I've written rants that aren't meant to be widely publicized, so I O> went and redacted some stuff from that post. Next time try to avoid O> linking my EEVBlog forum posts to wide distribution channels like this O> mailing list. O> |
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Measuring low resistance with a NanoVNA
I was participating in another groups.io mailing list on how well the NanoVNA can measure Q of small toroids for HF applications. In particular how accurate are the measurements for high Q designs? In this example Q = Reactance/ Resistance and the reactance at the desired frequency was around 170 ohms so the resistance is 1 ohm for a Q of 170. Can the NanoVNA measure resistances that low in the S11 shunt mode? I built an SMA test jig and SOL calibration loads. The next step was to measure an 0805 SMD 1 ohm resistor from 50 kHz. to 50 MHz. I was pleasantly surprised at the results one can achieve with such a low cost device. I thought others might find it interesting so here is a plot from NanoVNA Saver...
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Re: About S-A-A-2 clones
I by no means know what all is going on here.
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But here's my take, please correct me on what I have wrong. I bought an H4 through R&L (randl.com) as I posted here: /g/nanovna-users/message/16794 It may be primarily edy555's design, but not many here would bother to build a nanoVNA from a bare PC board and a bag full of parts. Hugen turned it into something you could just pull out of the box and turn on, and did at least some hardware and software development. Manufacturing and distribution done right is not easy. I am quite comfortable about my H4 purchase. Edy555 did not create it out of a vacuum, the nanoVNA is very much like the AQRP VIA. Pretty much all concepts from amateur built VNA's (a very incomplete list in post 1415) were pioneered in $20k+ machines decades before. I don't yet feel a need for anything better than an H4, but If buying an SAA2 would try to buy it from HCXQX, who OWOComm has designed the SAA2 for I would happily pay somewhat more to not have a clone. Perhaps we could encourage R&L to at least have some stock of product from the creators, and make clear who did the design and which is a clone. This is complicated by how there are now three variants of the SAA2 clones up on the R&L website, with things like a case, battery included, 4" screen, and N connectors. Those relatively minor features will be the deciding factor for many buyers. They would likely buy elsewhere if R&L didn't have exactly what they want. Jerry, KE7ER On Fri, Aug 21, 2020 at 11:40 AM, Geof Gibson wrote:
All that being said, I am now a little uncomfortable about my purchase. |
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Re: Tuning stub testing procedure
watch out rg-6 is 75 ohm coax but otherwise is usable as high as 1300Mhz.
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On Fri, Aug 21, 2020, 10:35 AM Clyde Spencer <cftr01b@...> wrote:
The procedure would be the same except to be sure you set the |
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Re: Open Source Hardware
Pierre Martel
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Off topic but what's the name of that power/swr meter project? |
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Re: Open Source Hardware
Off topic but what's the name of that power/swr meter project?
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On Fri, 21 Aug 2020 at 21:56, Pierre Martel <petem001@...> wrote:
I am in a few other open hardware/software groups. RadioBerry (HF SDR |
Roger Need
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