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Bob Albert #8393 I have two nanoVNAs each with a different problem. One refuses to accept any frequency above 900 MHz. I think I have had that aspect working before but now am not so sure. The other gives me a bad display on Smith chart, with the open circuit near the middle rather than at the left. This one for sure worked fine before. Is there some kind of basic reset that can restore operation on the second one, at least? The usual menu option RESET doesn't do it.
W0LEV All Messages By This Member #8394 I had your second problem when viewing the NANO on its screen while connected to the PCwith the USB cable. Once I removed the USB cable, all was as expected. The first: I've never been able to get mine to go above 900 MHz, free standing or connected to the PC with the USB cable. Dave - W?LEV On Thu, Dec 19, 2019 at 2:16 AM Bob Albert via Groups.Io <bob91343= [email protected]> wrote: I have two nanoVNAs each with a different problem. One refuses to accept any frequency above 900 MHz. I think I have had that aspect working before but now am not so sure. The other gives me a bad display on Smith chart, with the open circuit near the middle rather than at the left. This one for sure worked fine before. Is there some kind of basic reset that can restore operation on the second one, at least? The usual menu option RESET doesn't do it. -- Dave - W?LEV Just Let Darwin Work Just Think
Bob Albert #8395 Update.? I recalibrated and now the Smith display is okay.? Maybe I goofed and mixed up the calibration fixtures. Both units have a problem where they turn themselves off without provocation.? Sometimes in the middle of a measurement.? One unit already has had the power control IC replaced.? Batteries are fine. The one still won't go above 900 MHz. Bob toggle quoted message Show quoted text On Wednesday, December 18, 2019, 06:16:58 PM PST, Bob Albert via Groups.Io <bob91343@...> wrote: I have two nanoVNAs each with a different problem. One refuses to accept any frequency above 900 MHz.? I think I have had that aspect working before but now am not so sure. The other gives me a bad display on Smith chart, with the open circuit near the middle rather than at the left.? This one for sure worked fine before. Is there some kind of basic reset that can restore operation on the second one, at least?? The usual menu option RESET doesn't do it.
Bob Albert #8396 It does appear that the cable is somehow involved.? Be all that as it may, my problems are not stopping me from getting good use out of the units.? I am repeatedly amazed at the accuracy and versatility it offers.? If careful I can make measurements to better than 1%. The main lack for me is its inability to measure at audio frequencies.? No big deal; I have fancy gear for that. I am tempted to buy a couple more just so I have redundancy big time. Bob toggle quoted message Show quoted text On Wednesday, December 18, 2019, 07:34:24 PM PST, Bob Albert via Groups.Io <bob91343@...> wrote: Update.? I recalibrated and now the Smith display is okay.? Maybe I goofed and mixed up the calibration fixtures. Both units have a problem where they turn themselves off without provocation.? Sometimes in the middle of a measurement.? One unit already has had the power control IC replaced.? Batteries are fine. The one still won't go above 900 MHz. Bob ? ? On Wednesday, December 18, 2019, 06:16:58 PM PST, Bob Albert via Groups.Io <bob91343@...> wrote: I have two nanoVNAs each with a different problem. One refuses to accept any frequency above 900 MHz.? I think I have had that aspect working before but now am not so sure. The other gives me a bad display on Smith chart, with the open circuit near the middle rather than at the left.? This one for sure worked fine before. Is there some kind of basic reset that can restore operation on the second one, at least?? The usual menu option RESET doesn't do it.
Gyula Molnar All Messages By This Member #8405 Hi Bob, It is true that when one has several hours, one does not know the exact time. Anyone with multiple VNAs doesn't know which one is accurate - maybe because everything is relative? :-) :-) :-) (Although mass production works, there are still differences in the side-by-side product.) 73, Gyula HA3HZ
Rune Broberg All Messages By This Member #8406 Hi Bob, a general point: Some (early?) firmware versions for the NanoVNA "only" allowed operation up to 900 MHz. I suspect you have one of those - and that you will need to upgrade your firmware in order to get it working in the 900-1500 MHz span. In general: Upgrading to a newer firmware will probably also give you higher accuracy, as some improvements were made to the way the measurements were handled in the firmware. More knowledgeable list members can elaborate on this, I'm sure. -- Rune / 5Q5R On Thu, 19 Dec 2019 at 03:16, Bob Albert via Groups.Io <bob91343= [email protected]> wrote: I have two nanoVNAs each with a different problem. One refuses to accept any frequency above 900 MHz. I think I have had that aspect working before but now am not so sure. The other gives me a bad display on Smith chart, with the open circuit near the middle rather than at the left. This one for sure worked fine before. Is there some kind of basic reset that can restore operation on the second one, at least? The usual menu option RESET doesn't do it.
Bob Albert #8415 Yes I would like to know how to upgrade the firmware.? I know there is a dongle from ST that will do it.? This nano has had the USB connector removed.? I would like to solder it back but it's too small, beyond my soldering skills.? I have the tools but not good enough hand stability and vision acuity. Anyone who could help is welcome to try. Bob toggle quoted message Show quoted text On Thursday, December 19, 2019, 01:14:13 AM PST, Gyula Molnar <gyula.ha3hz@...> wrote: Hi Bob, It is true that when one has several hours, one does not know the exact time. Anyone with multiple VNAs doesn't know which one is accurate - maybe because everything is relative?? :-) :-) :-) (Although mass production works, there are still differences in the side-by-side product.) 73, Gyula HA3HZ
Paul M3VUV All Messages By This Member #8418 just wondering how you charge it without the usb socket?
Kurt Poulsen All Messages By This Member #8419 Hi Nanovnauser USB socket ??. The delay is part of the onscreen menu by selection "Display" then "Scale" then "Electrical Delay" Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] <[email protected]> P? vegne af nanovnauser@... Sendt: 19. december 2019 21:25 Til: [email protected] Emne: Re: [nanovna-users] problems just wondering how you charge it without the usb socket?
Paul M3VUV All Messages By This Member #8423 looks like messages got mixed up there.
Ron C All Messages By This Member #20491 Gyula HA3HZ, I read somewhere that A man with a clock always knows what time it is. A man with two or three clocks can never be sure..................... So in review, I'd say that you're right on the money! Ron WRKM750
Scotty Hicks All Messages By This Member #20495 Ah, Confucius say man with two watches don’t know what time it is. toggle quoted message Show quoted text On Feb 6, 2021, at 4:32 PM, Ron C via groups.io <ronsampservice@...> wrote: ?Gyula HA3HZ, I read somewhere that A man with a clock always knows what time it is. A man with two or three clocks can never be sure..................... So in review, I'd say that you're right on the money! Ron WRKM750
Clayton -ke7ngo All Messages By This Member #20501 Pretty good for a man born in BC. And watches came on the seen in 16fh century Clayton Heilman "The world is run by those who show up." Richard George Weingardt toggle quoted message Show quoted text On Feb 6, 2021, at 19:08, Scotty Hicks <Scotty@...> wrote: Ah, Confucius say man with two watches don’t know what time it is. On Feb 6, 2021, at 4:32 PM, Ron C via groups.io <ronsampservice@...> wrote: ?Gyula HA3HZ, I read somewhere that A man with a clock always knows what time it is. A man with two or three clocks can never be sure..................... So in review, I'd say that you're right on the money! Ron WRKM750
W0LEV All Messages By This Member #20504 In answering the 'accuracy' question, error bars must be considered. Evidently error analysis and calculus of variations is no longer taught in the schools. They both were part of the advanced physics labs I took some 50 years ago. Dave - W?LEV toggle quoted message Show quoted text On Sun, Feb 7, 2021 at 2:08 AM Scotty Hicks <Scotty@...> wrote: Ah, Confucius say man with two watches don’t know what time it is. On Feb 6, 2021, at 4:32 PM, Ron C via groups.io <ronsampservice= [email protected]> wrote: ?Gyula HA3HZ, I read somewhere that A man with a clock always knows what time it is. A man with two or three clocks can never be sure..................... So in review, I'd say that you're right on the money! Ron WRKM750 -- Dave - W?LEV Just Let Darwin Work

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