Re: OT: looking for testers for a tiny handheld spectrum alayzer
Eric
I would be interested in being a tester for your product, as I have 2 project antennae in the works now, and plan on another in the near future.
Best Regards,
Dennis
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On April 27, 2020 at 10:37 AM erik@... mailto:erik@... wrote:
Many users of the nanoVNA have expressed interest in a version that can be used as spectrum analyzer.
During the last weeks I have been designing, together with Hugen, of a self contained, ready build, hand-held spectrum analyzer to be sold for a very acceptable price.
The outline and display are exactly the same as the nanoVNA and the tinySA will come with a housing.
As the HW performance now seems to be OK and the SW is more or less complete i could use the help of some (not many) testers.
Preferably people that already own (or have access to) a spectrum analyzer and are active building something that requires a spectrum analyzer in the 0.1MHz till 350MHz range.
This tinySA can also capture 240MHz till 960MHz (with somewhat reduced performance and functionality) and it can also be used as a signal generator (0-350MHz and 240MHz till 9060MHz)
If you think you could contribute to the testing feel free to send me a PM with some info on the project you'd like the tinySA for.
There will only be a limited number of tester products.
Selected testers will receive a tinySA and are kindly requested to use it and feedback their experience.
I create a dedicated tinysa group for this purpose. /g/tinysa/topics
More information on this version of the tinySA can be found in this wiki
Please be patient as the wiki is running a bit behind.
--
Erik, PD0EK
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And the courts have already ruled that changing the names of variables doe NOT qualify as a re-write.
Vince - K8ZW.
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On 04/27/2020 04:01 AM, Jim Allyn - N7JA wrote: On Sun, Apr 26, 2020 at 11:09 PM, Alex wrote:
Developers can release binary files without publishing the source code, is
that okay? Not if any portion of the code is open source. If the code was entirely rewritten from scratch (doesn't seem likely), then it's OK.
--
K8ZW
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Hi Toontje, For a more secure solution, place 4 pieces of plastic pads between the pcb and the top blanket. /g/nanovna-users/message/1036973, Gyula HA3HZ -- *** ( ) ***
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Re: NanoVNA firmvare, compiled by DiSlord
#firmware
On Sun, Apr 26, 2020 at 11:37 PM, hwalker wrote:
Rudi,
Please be aware that the H4 has more flash memory space and a faster processor
than the -H. Some features that were introduced for the H4 by DiSlord such as
201 pts and 7 configuration slots can not fit in the -H limited flash memory
space.
That was one of the prime motivations for me upgrading to the H-4 besides it 4
" display. The H4 is more future proof and I foresee more innovative features
for it in the future. DiSlord is already considering implementing support for
the optional sandisk capability of the -H4 for saving screen shots and trace
data.
Hello Herb, In posting 12801 in that thread DiSloard publishes an address of google drive. In that archive I found file NanoVNA-H_v0.8.4.3_96kHz_ADC_800Hz_sweep_points.dfu (83 KB) That works on a 8 month old nanoVNA. 73, Rudi DL5FA
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Re: OT: looking for testers for a tiny handheld spectrum alayzer
Erik,
I might be interested in playing with one of those.? I don't have a project so much as I do have friends who are excited to learn about electronics.? I showed one how AM and FM spectra are different and how they change with modulation depth and frequency.? It was interesting to see his take on what goes on, that the books were really right about all of it, including Bessel nulls and all.? Another aspect is to see how the old signal generators have incidental FM which not only spoils the modulation quality but also offers an unintended FM generator.
Seeing how harmonics change depth with signal amplitude is also interesting, as the panel controls and manuals give no clue.? And again, the old generators have gratuitous distortion.
Audio generators are not free of these complications either.
I have a few spectrum analyzers which could serve as comparison vis amplitude and frequency calibrations.
So if I can be of help let me know.? I am in Los Angeles California.
Bob K6DDX
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On Monday, April 27, 2020, 07:37:33 AM PDT, erik@... <erik@...> wrote: Many users of the nanoVNA have expressed interest in a version that can be used as spectrum analyzer. During the last weeks I have been designing, together with Hugen, of a self contained, ready build, hand-held spectrum analyzer to be sold for a very acceptable price. The outline and display are exactly the same as the nanoVNA and the tinySA will come with a housing. As the HW performance now seems to be OK and the SW is more or less complete i could use the help of some (not many) testers. Preferably people that already own (or have access to)? a spectrum analyzer and are active building something that requires a spectrum analyzer in the 0.1MHz till 350MHz range. This tinySA can also capture 240MHz till 960MHz (with somewhat reduced performance and functionality)? and it can also be used as a signal generator (0-350MHz and 240MHz till 9060MHz) If you think you could contribute to the testing feel free to send? me a PM with some info on the project you'd like the tinySA for. There will only be a limited number of tester products. Selected testers will receive a tinySA and are kindly requested to use it and feedback their experience. I create a dedicated tinysa group for this purpose. /g/tinysa/topicsMore information on this version of the tinySA can be found in this wiki Please be patient as the wiki is running a bit behind. -- Erik, PD0EK
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Hi Hugen!
That was a very simple solution. I loosened the screws up and the device started working. Then I tightened them just enough for the case to close and all is working fine now.
Thanks a lot!! I was afraid to have to send the device back and wait another 6 weeks.
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On 27 Apr 2020, at 16:46, hugen@... wrote:
It looks like your NanoVNA-H4 that we sold earlier has a distorted case, you may need to loosen the screws on the back to start properly, we have fixed this issue, you can contact us for a new case. Sorry again for our mistake.
hugen
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It looks like your NanoVNA-H4 that we sold earlier has a distorted case, you may need to loosen the screws on the back to start properly, we have fixed this issue, you can contact us for a new case. Sorry again for our mistake.
hugen
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After waiting for 6 weeks I received my NanoNVA-H4 today. Very nice device, even nicer packaging.
When I started the Nano the right-hand menu showed up and was stuck at the RECALL option. I was not able to select any other option. Whenever I tap the screen I get back to the RECALL option. Sometimes is cycles between RECALL 4 and the RECALL sub menu.
I think something is stuck in the touch screen, however, I cannot see any physical damage.I upgraded to the latest version on which was supposed to fix the stuck screen, but this doesn¡¯t help.
Do you think my screen is broken?
Thanks,
Ton.
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OT: looking for testers for a tiny handheld spectrum alayzer
Many users of the nanoVNA have expressed interest in a version that can be used as spectrum analyzer. During the last weeks I have been designing, together with Hugen, of a self contained, ready build, hand-held spectrum analyzer to be sold for a very acceptable price. The outline and display are exactly the same as the nanoVNA and the tinySA will come with a housing. As the HW performance now seems to be OK and the SW is more or less complete i could use the help of some (not many) testers. Preferably people that already own (or have access to) a spectrum analyzer and are active building something that requires a spectrum analyzer in the 0.1MHz till 350MHz range. This tinySA can also capture 240MHz till 960MHz (with somewhat reduced performance and functionality) and it can also be used as a signal generator (0-350MHz and 240MHz till 9060MHz) If you think you could contribute to the testing feel free to send me a PM with some info on the project you'd like the tinySA for. There will only be a limited number of tester products. Selected testers will receive a tinySA and are kindly requested to use it and feedback their experience. I create a dedicated tinysa group for this purpose. /g/tinysa/topicsMore information on this version of the tinySA can be found in this wiki Please be patient as the wiki is running a bit behind. -- Erik, PD0EK
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Re: [Measuring] What is your favourite method of measuring inductance in a coil?
On Sun, Apr 26, 2020 at 01:27 PM, hwalker wrote:
Dick wrote:
There must be something else as I cannot reproduce your results.
...... Trying to measure a 10 mH RF Choke, display bounces around from 190pH to 600pH. ..
hwalker replied:
...I don't know what test frequency manufacturers specify their chokes at but the J. Miller choke quickly became capacitive with high impedance above 200 kHz. I limited my sweep to 30 kHz-200kHz for testing. In that range values between 16.9 - 22.9 mH were measured. ....
=========================================
An article titled "Measuring mH inductors with the VNWA" at also seems to indicate that large value (mH) inductors quickly go parallel resonant with with high impedance above 100 kHz making accurate measurements with a 50 ohm NanoVNA difficult.
If you are trying to determine how much impedance the 10 mH inductor will give you at and above its parallel resonant frequency, then you should switch to the series S21-method to get a more precise number. If you are just trying to verify its marked value then I would limit testing to below 200 kHz. Limiting the NanoVNA's band width below 1 kHz using DiSlord's beta firmware (not applicable to NanoVNA-F) also helped to stabilize readings.
The VNWA has been around for a few years now. I had been on the lookout for one before the NanoVNA came on the scene but never came across a deal that didn't break my budget. Many articles, fixtures, and measurement techniques for the VNWA can be applied to the NanoVNA. Kurt Poulsen OZ7OU, a member of this group, has been a frequent contributor to the VNWA over the years and has freely passed on some of his knowledge here.
- Herb
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I have to agree - I have been pulling out my hair trying to tune a 70cm QFH (Dual 1/2 turn helix) antenna.
The results I get is very sensitive to length, so much so that I gave up in the end. I have tried to re-calibrate further down the feed line, but it just move the results around.
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Hello all, just a quick introduction from myself. Recently purchased nanovna H.
Looking forward to getting to grips with it potential.
Thanks to all those who have shared their technical knowledge, I am finding great info for a total beginner.
73s for now
Ernie. GM0EZP
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Re: Up-grading the -F model...
v0.1.4 2020-03-26 : This update requires recalibration of the device 1) Supports 0dBm output (fundamental frequency, for HW V3.1 & HW V2.3 only, for HW V2.2 still -13dBm output); 2) No new features were added compared to firmware v0.1.1. How to know my NanoVNA-F HW version?: /g/nanovna-f/wiki/How-to-know-my-NanoVNA-F-HW-versionv0.1.0&v0.1.1 2020-02-03 : This update requires recalibration of the device 1) Add TDR feature; 2) Add marker tracking feature & dynamic update of frequency and other information when the mark moves; 3) Add ordinate display 4) Support to 10kHz frequency 5) Some font, color, and layout optimizations 6) Suggestions from groups.io/nanovna-f & facebook group members and much more, thank you for your feedback (1) a beep to the end of each standard measurement in calibration (2) callsign.txt expanded to 44 chars, not limited to call sign display, can display your phone and email address, etc. 7) The startup information is not displayed for a long time at present, you can call it up in the menu. Just into the menu: CONFIG -> ABOUT v0.0.5 2019-12-30 : This update requires recalibration of the device 1) Support measurable frequency to 1.5 GHz, default setting 1 GHz, accurate measurement up to 1.35GHz; 2) Fix: unexpected 0.3dB offset of s21 in thru; 3) Fix: mark all off bug; 4) Fix: clutter display when standing wave ratio is infinite; 5) Add version & info command; 6) Add REAL IMAG R X trace format. v0.0.4 2019-10-30 : This update does not require recalibration of the device 1) Can display call sign; 2) fix BUG: CW=100MHz do not output 3) Optimize Chinese translation 4) How to display your call sign: /g/nanovna-f/wiki/How-to-add-call-sign-displayv0.0.3 2019-10-07 : This update requires recalibration of the device 1) support NanoVNA's PC software; 2) Add a boot tone; 3) Optimize band (<100MHz) S11 measurement results v0.0.2 2019-08-29 : First Release Github: Groups.io: /g/nanovna-fFiles: /g/nanovna-f/filesWiki: /g/nanovna-f/wikiFacebook: Website: deepelec.com Thank you for your support to BH5HNU and deepelec :-)
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On Fri, 24 Apr 2020 at 15:51, <whdpc113@...> wrote: If you have a bad mismatch, the reactive part of the impedance will vary along the length of the feed line. What your rig sees at the end of the
feedline, and what the MFJ sees with a jumper and your rig behind it may
differ. Does the SWR reading on the rig change with and without the MFJ
inline? I have found VHF and UHF antenna SWR very sensitive to small
changes in length/tuning. With a VSWR > 1, *both* the real and imaginary (reactive) part of the impedance vary as one moves along a transmission line. It is not just the imaginary component as you say. If that transmission lines was lossless, the VSWR would remain a *constant*, not vary as you say. The impedance varies along the transmission line, but the VSWR remains constant. What any piece of test equipment shows depends on its quality. Dave, G8WRB. -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 01621-680100./ +44 1621 680100 Registered in England & Wales, company number 08914892. Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
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On Sun, Apr 26, 2020 at 11:09 PM, Alex wrote: Developers can release binary files without publishing the source code, is
that okay? Not if any portion of the code is open source. If the code was entirely rewritten from scratch (doesn't seem likely), then it's OK.
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Re: Up-grading the -F model...
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On Mon, Apr 27, 2020 at 01:35 PM, k4mla wrote:
All,
Where can I find the instructions on upgrading to the latest firmware
version for the -F model and what is the latest version? Thanks in
advance...
Larry, K4MLA
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Yes, I agree. Because it is an OSS project, we have not restricted BH5HNU to continue to sell NanoVNA-F.
But do you think NanoVNA-F is still an OSS project? Developers can release binary files without publishing the source code, is that okay?
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Up-grading the -F model...
All,
Where can I find the instructions on upgrading to the latest firmware version for the -F model and what is the latest version? Thanks in advance...
Larry, K4MLA
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Doug, I will try that tomorrow.... that¡¯s one thing I didn¡¯t check
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Here is a second report on the effect of calibrating the NanoVNA on SWR and Return Loss measurements. This time a 20M dipole was used as the antenna. It was surprising to me to see how good the measurements were when using the default 50 kHz. to 900 MHz. calibration and setting the Stimulus range to 13 to 15 MHz. Interpolation works well under certain conditions.
Roger
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Gyula Molnar
RandMental
Dr. David Kirkby, Kirkby Microwave Ltd
Jim Allyn - N7JA
KK4JOW
Roger Need