Re: Which firmware for AA contains the "Config" button
On Fri, Feb 14, 2020 at 08:02 AM, Alberto I2PHD wrote:
Can please somebody describe in simple English terms the differences between the standard firmware and the AA (Antenna Analyzer) firmware ?
What can be done with the AA version that cannot be done with the standard version ?
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Alberto,
The firmware is the same except the -AA firmware has a larger font-size (about the same size as used on the 4" NanoVNA-H4), The primary drawback is that in order to achieve the larger font-size only 4 save locations is available instead of five.
Originally, to achieve the same thing and also allow a Chinese character set, only two traces could be displayed which were used on CH0 for s11 measurements. Thus the -AA or Antenna Analyzer label.
- Herb
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Re: Which firmware for AA contains the "Config" button
Both versions can do everything - the ONLY difference is the font size and traces (bigger font size in mamory meant removing 2 traces) Check the forum Wiki - all the info is there. On Friday, February 14, 2020, 11:02:43 a.m. GMT-5, Alberto I2PHD <i2phd@...> wrote: > hugen's official AA releases at all have a CONFIG menu. If you only want two traces then you will have to turn off the traces for CH1. ------------------------ Can please somebody describe in simple English terms the differences between the standard firmware and the AA (Antenna Analyzer) firmware ? What can be done with the AA version that cannot be done with the standard version ? Thanks -- /*73 Alberto I2PHD* <<< >>>/
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Re: Which firmware for AA contains the "Config" button
hugen's official AA releases at all have a CONFIG menu.
If you only want two traces then you will have to turn off the traces for CH1. ------------------------ Can please somebody describe in simple English terms the differences between the standard firmware and the AA (Antenna Analyzer) firmware ? What can be done with the AA version that cannot be done with the standard version ? Thanks -- /*73 Alberto I2PHD* <<< >>>/
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Re: Which firmware for AA contains the "Config" button
Greatly appreciate the help! That's close enough for me. Installed. I will shut down the two traces when I don't need them. Just happy to finally have a font I can read, and love being able to have some more settings to play with!
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Re: Which firmware for AA contains the "Config" button
On Thu, Feb 13, 2020 at 03:32 PM, <kb0npw@...> wrote:
Have tried about 7 different firmwares now, checked Wiki, searched high and low. Surely there is a firmware for AA, two trace, with large fonts, and the Config menu which allows touch calibration.
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hugen's official AA releases at all have a CONFIG menu. If you only want two traces then you will have to turn off the traces for CH1.
- Herb
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Re: Which firmware for AA contains the "Config" button
Have tried about 7 different firmwares now, checked Wiki, searched high and low. Surely there is a firmware for AA, two trace, with large fonts, and the Config menu which allows touch calibration.
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Re: US based Ebay seller claims he is selling v3.4 NanoVNA - true?
Clarence - can you provide a link to that specific product?
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Hello Kevin,
What I did was just get 2 SMA-M to SO-239 6" RG-316 pigtails, and 3 PL-259 to SMA-F adapters & use the SMA cals that came with the nano. That makes it easy to add any length coax (with PL-259s) between them and calibrate at the end of it all. Also got a couple female barrel connectors (SO-238). Using the SMA load on an adapter is likely better than putting 2 leaded axial resistors in a PL-259.
The adapter, and barrel connector if needed, adds about 1-1/2 inch or so, which is not significant at HF, though may be at VHF; and that extra length can be compensated in the nano. Probably not necessary tho; you'll likely have at least an inch and a half or so between an antenna's SO-239 and the actual feed-point, so setting the calibration plane a bit beyond the end of a feed-line may actually be beneficial.
It's also worth remembering that for SWR tuning purposes, as you approach 1:1 the length differences become insignificant; a matched line with no standing wave has a constant impedance along its length. The phase vector rotates, but it's around a point, not a circle, at 1:1.
Just my 2 cents, FWIW.
--KV5R
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Palm Pilot or Psion stylus works perfectly too.
73 Bob GM4CID
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Excellent idea!
I hope you're working on a book: "1001 Uses for Motrin" LOL
73, Andy, KG5RKP
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On Fri, Feb 7, 2020 at 04:49 AM, Chuck Carpenter wrote:
Trying to work with the menus from the NanoVNA screen, I wasn't getting along
well. The "guitar pick" supplied wasn't at hand and other objects I had nearby
weren't much use either.
I had a soft gel med laying aside waiting to be used. That worked great! Had
just the right radius, friction and didn't mark the screen. Made it easy to
slide markers around the plots. By itself it was a little too short: My hand
blocked my view.
I mounted the "stylus" in an old marker pen body and all is well. Works great!
Picture attached...
--
Chuck, W5USJ
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Re: US based Ebay seller claims he is selling v3.4 NanoVNA - true?
The last version that hugen released should have that - he creates all his variants at the same time.
Please look at:
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On Thursday, February 13, 2020, 12:08:01 p.m. GMT-5, <nanovnagroup@...> wrote:
Care to send us a link to the specific web page of the item?
Thank you.
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Re: US based Ebay seller claims he is selling v3.4 NanoVNA - true?
On Wed, Feb 12, 2020 at 11:46 AM, Clarence Peckham wrote: I just bought a nanovna-h with 4" display from amazon with version 4.2 PCB. IT
works very well so far and only took two days to get it.
Clarence, NT7V Clarence could you please share a link to the web page where you made the purchase? Thank you.
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Re: nanoVNA Maximum Impedance Measurement (Folded Dipole example)
What was your wire spacing to yield 312 + j286 ohms? There should not be a
large reactive component.
Using 4NEC2, I modeled a 40-meter folded dipole at 50-feet off soil surface
(moderate soil) using 6-inches between the two conductors. The result
showed 352 +/- j0.
I suspect your wire spacing was too great to show such an inductive
impedance.
Dave - W?LEV
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On Thu, Feb 13, 2020 at 12:42 PM Chuck Carpenter <w5usj@...> wrote: Soaring Spitfire,
I doubt that your resistors would measure 200 Ohms at 2 meters? At DC the
resistance will look OK. With any length of leads and some distributed
capacitance the resistors will look like a complex impedance at 148 MHz.
That's what the Nano will be measuring.
Also why do you expect the feed point impedance of the folded dipole to be
300 Ohms? I modeled a 1/2 wave folded dipole (40 inches) at 148 MHz and the
feed point Impedance = 312 + J 286 ohms, slightly long.
If you use the software and selected one of the display options to be R+JX
you will see the plots for R and X over the scanned frequency range.
Together those will be the complex impedance. As noted elsewhere, you need
to include the conversion factors from the coax lengths.
An accurately made coax BalUn for the frequency would be best. Lumped
inductance BalUns at 2 meters get really weird...8^)
Have fun.
--
Chuck, W5USJ
--
*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*
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Re: US based Ebay seller claims he is selling v3.4 NanoVNA - true?
Today I finally got a response from the seller to my follow up message asking if he could post some pictures of the PCB showing the v3.4 label on it, as it would be beneficial to his sales as well.
Seller [you.are.you] said:
"ok,thanks for your suggestion"
Yeah, right, hahaha.
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Which firmware for AA contains the "Config" button
I just flashed the 800 mhz aa version to my NanoVNA. Works great, but no Config button. Is there a version out there that contains that in the Antenna Analyzer variant?
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I need a holiday haha. Thanks for confirming my brain is kinda working.... Thanks for the help
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Re: US based Ebay seller claims he is selling v3.4 NanoVNA - true?
A recheck of the EBAY Listing indicates he has 0 units left.. Want to bet he returns with changes in the listing
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Re: US based Ebay seller claims he is selling v3.4 NanoVNA - true?
The case hides the battery size. I have a pre-3.4 and I upgraded to 1.5Ghz.. THe spec is showing a 400mah battery .. Not 3.4..
I find that 9-5 US time, +/-2 hours he's in the USA in his office.. When you get responses 2-3-4 am he's in China.. If they respond or ship on Sunday's they are in China.
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Re: nanoVNA Maximum Impedance Measurement (Folded Dipole example)
Using NanoVNA SAVER, I calibrate and Sweep using 144Mhz Start 148Mhz end.. and you can set sweep x4.. that's 101 points per MHZ.. It takes a but longer.. The display does look real pretty and if you dump it to printer.. Great..... Now if you are making a filter and using a trimmer cap, each full screen scan takes about 3-4 seconds.. So rotate the trimmer SLOWLY..
There is an advantage to attach an external computer. I don't know the limits, but you can scan more than 101 points. There is a multiplier that divides the span, but increases the points recorded at a decrease in time. A times101 points I've gone to 5.. 5 times as many points 505, and 5 times as long for1 scan. I do not know it's limit.. I'd bet as long as the Start STOP Bandwidth versus synthesizer step isn't exceeded your fine.
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Alberto I2PHD
Bob Benedict, KD8CGH
Larry Macionski