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Features wanted for NanoVNASharp software
There are several features missing in current version:
* Two permanent markers. There is only one marker displayed when hovering with mouse over graph. Not so easy to make a screen shot and still displaying marker value. * With two markers a delta marker funktion would be fine. * Sometimes the plots are rather noisy, so an averaging funktion would help. Ernst |
Re: Defective NanoVna
For every upgrade you need to calibrate it.
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Before any calibration, you need to reset the calibration data. Once saving the calibration to position 0 (zero) it will always load that calibration data. Turn off and on your unit after calibration. Have a go and let us know! Cheers Lu¨ªs CT2FZI On Wed, 7 Aug 2019 at 11:09, <jimcking@...> wrote:
Got it. Thanks. The 800 MHz ch now shows going to 800 MHz. It has |
Re: Some basic load measurements
That is expected Peter. Have you got the imaginary parts or phases? Best to plot on a Smith chart too and see how your samples rotate from low to high frequency.? 1.02 swr corresponds to about 40dB return loss which is very respectable at 900MHz.Sent from my Samsung Galaxy smartphone.
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-------- Original message --------From: Peter Gottlieb <hpnpilot@...> Date: 07/08/2019 04:43 (GMT+01:00) To: [email protected] Subject: [nanovna-users] Some basic load measurements Resending from website as it didn't seem to go through as a message.? Also my pasted table from Excel lost formatting so I tried to fix it to be more readable.I just did some very simple resistance and SWR measurements using a HP 8753ES with 85046A, resistance was measured using a calibrated Agilent 34401A in 4 wire mode.I did a very basic one port 3 point cal using a Anritsu OSL which is specified to over 3 GHz.I took measurements at 900 MHz.Load????????????????????? R ohms????? SWR????????? SWR notesOSL??????????????????????? 50.052?????? 1.001???????? FlatCheap BNC??????????? 51.104?????? 1.908???????? Sloping up with freqNano load?????????????? 49.044?????? 1.019???????? FlatNarda 12.4 GHz????? 49.536?????? 1.018????????? FlatTiny SMA???????????????? 50.787????? 1.009????????? FlatI am guessing there is some significant reactive component in the BNC terminator.? All three of the SMA loads showed a flat SWR with frequency so I'm thinking they all have a minimal reactive component.The difference in resistances while keeping SWR low was a bit of a surprise to me.? The load that came with the Nano is over an ohm off of the load I used to calibrate yet the SWR remains at a low 1.019. Why is this?? I did the math and surprisingly this is indeed correct, per calculation the SWR should be 1.021 vs my measured 1.019.? I'd say this is darn close seeing one measurement is DC resistance and the other is at 900 MHz.So my conclusion is that SWR is not a sensitive number to see resistance differences.Once I read some of the references cited I can do some more advanced measurements.Peter
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Re: Defective NanoVna
Hi,
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Please check here: [image: image.png] On Wed, 7 Aug 2019 at 09:57, <jimcking@...> wrote:
Hi SPACE OPQA, |
Re: Defective NanoVna
Hi Jim
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I think we're all struggling to identify and track the different versions of the firmware. I suspect they're all ones written by Hugen who wrote them for the version he sells at gen111.taobao.com and now on Alibaba (search his posts for a link). Mike On Wed, 7 Aug 2019, 09:53 , <jimcking@...> wrote:
Hi Mike, |
Re: Some basic load measurements
Very interesting results Peter. It prompted me to check out the various
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dummy loads I have with my multimeter. The decent ones with N type connectors came out at 50 ohms +/- 0.2 ohms, which might imply my meter isn't far out. My Nano load measures 51.3 and a longer reactive sma load measures 51 ohms. Nothing quite as bad as a Zetagi CB-type dummy load at 53.3 ohms though. I guess the next question is whether we can get better loads without spending more than the price of the Nano! Mike On Wed, 7 Aug 2019, 03:43 Peter Gottlieb, <hpnpilot@...> wrote:
Resending from website as it didn't seem to go through as a message. Also |
Some basic load measurements
Resending from website as it didn't seem to go through as a message. Also my pasted table from Excel lost formatting so I tried to fix it to be more readable.
I just did some very simple resistance and SWR measurements using a HP 8753ES with 85046A, resistance was measured using a calibrated Agilent 34401A in 4 wire mode. I did a very basic one port 3 point cal using a Anritsu OSL which is specified to over 3 GHz. I took measurements at 900 MHz. Load R ohms SWR SWR notes OSL 50.052 1.001 Flat Cheap BNC 51.104 1.908 Sloping up with freq Nano load 49.044 1.019 Flat Narda 12.4 GHz 49.536 1.018 Flat Tiny SMA 50.787 1.009 Flat I am guessing there is some significant reactive component in the BNC terminator. All three of the SMA loads showed a flat SWR with frequency so I'm thinking they all have a minimal reactive component. The difference in resistances while keeping SWR low was a bit of a surprise to me. The load that came with the Nano is over an ohm off of the load I used to calibrate yet the SWR remains at a low 1.019. Why is this? I did the math and surprisingly this is indeed correct, per calculation the SWR should be 1.021 vs my measured 1.019. I'd say this is darn close seeing one measurement is DC resistance and the other is at 900 MHz. So my conclusion is that SWR is not a sensitive number to see resistance differences. Once I read some of the references cited I can do some more advanced measurements. Peter |
Re: NanoVNA Under The Covers
I just did some very simple resistance and SWR measurements using a HP 8753ES and 85046A.
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I did a very basic one port 3 point cal using a Anritsu OSL which is specified to over 3 GHz. I took measurements at 900 MHz. Resistance was measured using a calibrated Agilent 34401A in 4 wire mode. Load R ohms SWR SWR notes OSL 50.052 1.001 Flat Cheap BNC 51.104 1.908 Sloping up with freq Nano load 49.044 1.019 Flat Narda 12.4 GHz 49.536 1.018 Flat Tiny SMA 50.787 1.009 Flat I am guessing there is some significant reactive component in the BNC terminator.? All three of the SMA loads showed a flat SWR with frequency so I'm thinking they all have a minimal reactive component. The difference in resistances while keeping SWR low was a bit of a surprise to me.? The load that came with the Nano is over an ohm off of the load I used to calibrate yet the SWR remains at a low 1.019. Why is this?? I did the math and surprisingly this is indeed correct, per calculation the SWR should be 1.021 vs my measured 1.019.? I'd say this is darn close seeing one measurement is DC resistance and the other is at 900 MHz. So my conclusion is that SWR is not a sensitive number to see resistance differences. Once I read some of the references cited I can do some more advanced measurements. Peter On 8/5/2019 3:01 PM, Warren Allgyer wrote:
Tuck |
Re: A few entry level questions
Bob,
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In case you need to enter the frequency manually, select stimulus as stated, then after you select what you want (start, stop, centre, etc) and the Freq appears across the bottom of the touchscreen, press the open white bar on the right side of the numbers to bring up the onscreen keyboard. Play with to to get familiar. You can't break anything. One thing I found is you can actually go down as far as 10khz but the display will be all over the place. Regards Larry On Tue, Aug 6, 2019 at 05:20 PM, Larry Goga wrote:
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Re: Defective NanoVna
Hi Jim
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The 800MHz versions of the firmware are the ones that avoid glitches at 300 and/or 600MHz. The design seems to be based on pushing chips beyind spec and using harmonics of the oscillator signal for higher frequencies - I assume the changeover points are 300 & 600 MHz with the 900 MHz builds. Mike On Tue, 6 Aug 2019, 22:14 , <jimcking@...> wrote:
Yes, I did reload firmware with nanoVNA_900ch_20190722.dfu |
Re: A few entry level questions
The screen is touch sensitive. Tap it to bring up the home display menu. Select ¡°stimulus¡±. That¡¯s where you enter the frequencies and other information. You can also push down on the jog wheel to activate the menu and then scroll and select.
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Go to ¡°files¡± on the groups.io website and download the PDF titled ¡°Menu Map¡±. It will show you how to navigate the menu structure. Have fun, Larry On Aug 6, 2019, at 3:01 PM, Stuart Landau via Groups.Io <stuartl73@...> wrote: |
Re: Defective NanoVna
OK, so please try the 800Mhz version.
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Its used for high temp. Will also eliminate some harmonics. Hope it helps... There is a August version already. Cheers! On Tue, 6 Aug 2019 at 22:14, <jimcking@...> wrote:
Yes, I did reload firmware with nanoVNA_900ch_20190722.dfu |
Re: A few entry level questions
Certainly reasonable questions. I would add entering frequencies and other entries. I am new to the NanoVNA but not network analysis.
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Stuart K6YAZ On Aug 6, 2019, at 11:56 AM, Larry Rothman <ac293@...> wrote: |
Re: Defective NanoVna
Hello,
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Have you tried to upgrade (firmware) your unit? That issue was already addressed. Cheers! LL On Tue, 6 Aug 2019 at 21:18, <jimcking@...> wrote:
I just received a NanoVna from Amazon (AURSINC). It is a black one with |
Defective NanoVna
I just received a NanoVna from Amazon (AURSINC). It is a black one with the shields.
The receive side shows a signal at 300 MHz with input connected to dummy load. The signal is so strong that it shows at -6 dB from the top of the screen. I have two others that are from other sources and they show a very small signal at around 300 MHz that does not interfere with measurements. The interference on this one is so bad that it is unusable. Any idea what this could be and is it something I can fix without returning it to Amazon? Tried calibration and it did not help. Any help greatly appreciated. Jim K. |
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