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Remote Operation of NanoVNA-H
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I am going to be working with wire antennas in the 3 to 30 MHz range. I would like to attach the VNA at the antenna feed point and have the antenna at operating height. Therefore I would like to use NanoVNA-Saver connect via the NanoVNA USB-C port to the PC connected by replacing the USB cable with some sort of a RF link, (wifi or bluetooth). I have a couple of Bluetooth-to-usb dongles but don't yet see a way to have them connect to each other and pass the bi-directional data. The connection range needs to be in the 60 ft (possibly up to 100 ft range).
Any experience or suggested approach for doing this? I've seen somewhere a spec name for the data exchange that NanoVNA-Saver to NanoVNA uses, but have not been able to find it again. Anybody know off the top? Will the nanoVNA USB-C port provide battery power out to operate a dongle device? |
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This doesn't answer your question, but I believe you could achieve the same result
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by calibrating the VNA through your run of coax to the antenna feed point. So perhaps have an assistant up on the roof, they attach the short, open, and load calibration standards to the coax while you run the VNA at your operating desk. Alternately, detach the high end of the coax and bring it in through a window to your operating position for the calibration procedure. Jerry, KE7ER On Wed, Aug 12, 2020 at 12:12 PM, Steve Dightman wrote:
I am going to be working with wire antennas in the 3 to 30 MHz range. I would |
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On 8/12/20 1:16 PM, Jerry Gaffke via groups.io wrote:
This doesn't answer your question, but I believe you could achieve the same resultOr have a relay box at the far end (Antenna Under Test) with open, short, load, antenna. At HF, the distance through the box is negligible. However, there are cases where you don't want "wires" near the AUT - fiber optics and wireless w/batteries are your friends in this case. Jerry, KE7ER The NanoVNA looks like a serial port to the host computer. I don't think it can "supply" current, but I don't know. You can load NanoVNA-Saver on something like a Rpi and VNC to it. However, I'm not sure *all* front panel functions of the NanoVNA can be done over the serial port. |
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Nanovna use USB serial port. Serial over WiFi works with nanovna saver.
Version 1: raspberry pi Zero wh + raspberry Linux lite + ser2net + PC side true port I use 18650 Li ion battery + power bank Module to Supply Nanovna Version 2: Android phone with USB otg cable + tcpuart + PC side true port Long coxial cable not the best method. Cannot corrected by oslt calibration 100¨G quality on far end. The problem for example the cable loss. Very long lossy coxial cable always close to own impedancia with or without far end short or open circuit. For example no way to correct calibration on 70cm 100 meters rg174 coaxial cable. Of course the sample is extreme. But problem exist in lower lenght cables. /g/nanovna-users/topic/70124668#11563 |
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WiFi dongles may be better, if you find a way. Bluetooth specification says its range in 10 meters/30 feet. Of course, that's the spec and it may reach farther.
As a starter, I would suggest making a cable to reach from the ground to your antenna, calibrate the vna through that cable (on the ground), and then connect cable to antenna and hoist into position. Then you can do the actual antenna tests. When you calibrate thru the cable on the ground, you'll find out if you can calibrate through that much cable, too. Good luck! I hope it works - I've wondered about the same thing. Doug, K8RFT |
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Why don't you use the recent features that? autosave on SDcard a plot every n seconds??? I asked for such a feature and OneOfEleven immediately implemented it.?? Look at the attached post:
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Il 06/08/2020 12:18, OneOfEleven ha scritto:
I've added the ability to auto save to SD card every 'n' seconds for those that have SD cards on their nano's. The option is in the "SD CARD" menu. A setting of '0' seconds disables auto save. You can find the NanoVNA-H firmware (and windows software to upload the firmware) in the "Release" folder here .. I can't do H4 firmware because I don't have a H4 to test with. Best 73 Piero, I0KPT Il 13/08/2020 14:59, DougVL ha scritto: WiFi dongles may be better, if you find a way. Bluetooth specification says its range in 10 meters/30 feet. Of course, that's the spec and it may reach farther. |
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Sorry, but this firmware and the repo have been deleted.due to GPL complaints from one member last week.
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If you have a copy that you would like to share - please do so PRIVATELY. Thanks, Larry On Thursday, August 13, 2020, 9:03:28 a.m. EDT, Piero Tognolatti <piero.tognolatti@...> wrote:
Why don't you use the recent features that? autosave on SDcard a plot every n seconds??? I asked for such a feature and OneOfEleven immediately implemented it.?? Look at the attached post: Il 06/08/2020 12:18, OneOfEleven ha scritto: I've added the ability to auto save to SD card every 'n' seconds for those that have SD cards on their nano's. The option is in the "SD CARD" menu. A setting of '0' seconds disables auto save. You can find the NanoVNA-H firmware (and windows software to upload the firmware) in the "Release" folder here .. I can't do H4 firmware because I don't have a H4 to test with. Best 73 Piero, I0KPT Il 13/08/2020 14:59, DougVL ha scritto: WiFi dongles may be better, if you find a way.? Bluetooth specification says its range in 10 meters/30 feet.? Of course, that's the spec and it may reach farther. |
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Sorry, but I didn't download the firmware (I am on vacations and I was just planning how to make some measurements, so I asked if someone could implement such feature. OneOfEleven immediately did it.). But I don't understand why such a firmware version wasn't GPL compliant. Could we ask to OneOfEleven to publish it again?
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Thanks, Piero Il 13/08/2020 15:05, Larry Rothman ha scritto:
Sorry, but this firmware and the repo have been deleted.due to GPL complaints from one member last week. |
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Larry I have to ask: why privately?
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On Thu, Aug 13, 2020 at 06:05 AM, Larry Rothman wrote:
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Dave,If you want to be in compliance with the GPL, you cannot publicly share any binaries without the corresponding source code.Since OneofEleven deleted her Github repo - there is no source code publicly available to share anymore.
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Of course, you are free to do as you please, as other have done. ...Larry On Thursday, August 13, 2020, 8:58:04 p.m. EDT, Dave VE3LHO <dave@...> wrote:
Larry I have to ask:? why privately? On Thu, Aug 13, 2020 at 06:05 AM, Larry Rothman wrote:
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Some people preserved the code, you can find the links in this group:
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/g/open-nanovna/ On Fri, 14 Aug 2020 at 14:30, Larry Rothman <nlroth@...> wrote:
Dave,If you want to be in compliance with the GPL, you cannot publicly |
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I see. I had a long response to this typed up but decided to not add my amateur lawyer views to this and I deleted it. At this point people should probably do what they feel comfortable with, in terms of sharing these binaries.
The ideal scenario of course is that someone had a copy of the repo and can make the source available again but I guess since it hasn't happened at this point it won't happen. |
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There are multiple people that did that, just not on this list.
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On Fri, 14 Aug 2020 at 16:48, Dave VE3LHO <dave@...> wrote:
I see. I had a long response to this typed up but decided to not add my |
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Jerry has the right answer. I've attached results from a 10M dipole at 30
feet. I calibrated with the feedline, then attached the antenna and raised it to final height. Then, I took these measurements. [image: new 10M Dipole with cable calibrated out raised added 5 inches per side markers SmithChart FINAL.PNG] [image: 3-new 10M Dipole with cable calibrated out raised added 5 inches per side expanded markers FINAL.PNG] On Wed, Aug 12, 2020 at 4:16 PM Jerry Gaffke via groups.io <jgaffke= [email protected]> wrote: This doesn't answer your question, but I believe you could achieve the-- Carey Fisher careyfisher@... 
new 10M Dipole with cable calibrated out raised added 5 inches per side markers SmithChart FINAL.PNG
3-new 10M Dipole with cable calibrated out raised added 5 inches per side expanded markers FINAL.PNG
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aparent1/kb1gmx
I'm with Jerry KE7ER.
I've tested many (large number ) of antennas. You calibrate to the end of the cable and you get an answer that is correct. However the cable should not be some old dead section that has unacceptable loss for any conceivable use. That works correctly with a very expensive VNA/PNA or NanoVNA. If getting to the end of the cable use a different one for the occasion. I've done this for many times when testing elevated antennas. Be wary of one one thing is the cable is an intrinsic part of the antenna such as in an End Fed testing as the original poster wanted (remote isolated VNA) you need to simulate the operating configuration. If you literally had a nanoVNA with Wifi connect at the end of an end fed with out coax shield connection you would get erroneous data. Allison ----------------- No direct email, it goes to bit bucket due address harvesting in groups.IO |
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kb1gmx wrtoe:
If getting to the end of the cable use a different one for the occasion. I'veBy that I believe Allison means that if you have 78 feet of RG8X from rig to antenna, you could calibrate your VNA using 78 feet of RG8X coiled up at your feet in the shack. Being off in length by 1/20'th of a wavelength at the highest frequency of interest is probably ok. Be wary of one one thing is the cable is an intrinsic part of the antenna suchYes, the EFHW needs at least a few feet of counterpoise. In normal use, the coax from matchbox to the rig is the counterpoise. When checking out my EFHW-8010 I used a portable antenna analyzer (the AQRP VIA), had it attached directly to the matchbox coax port. The SWR looked good while standing on a 7 foot aluminum stepladder and holding the analyzer, that was enough of a counterpoise for the very high impedence EFHW. But if I let go of the analyzer and drew a couple feet away, the SWR was drastically worse. Jerry, KE7ER |
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