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Re: NanoVNA-Saver 0.1.3
Thanks, I'll get that fixed in the next version :-) Didn't catch that one
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during the testing, clearly ;-) -- Rune / 5Q5R On Wed, 16 Oct 2019 at 18:56, W5DXP <w5dxp@...> wrote:
Thanks Rune, when I said "considerable improvement" I was talking about |
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Re: NanoVNA-Saver 0.1.3
W5DXP
Thanks Rune, when I said "considerable improvement" I was talking about the better visibility it provides OFs like me with macular degeneration, cataracts, etc. However, I think there is a slight bug in the graph line widths. When I launch saver, it remembers what line width I previously selected but it doesn't implement it until I make a new change to the line width.
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Re: NanoVNA-Saver 0.1.3
Right click the charts. :-)
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-- Rune / 5Q5R On Wed, 16 Oct 2019 at 18:42, W5DXP <w5dxp@...> wrote:
Sorry, I can't seem to locate the fixed scaling options. Where are they? |
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Re: NanoVNA-Saver 0.1.3
You're right, Raymond! I forgot about that. I still need to do *more* with
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it - it breaks in places. But I guess as long as people don't complain about it ... ;-) -- Rune / 5Q5R On Wed, 16 Oct 2019 at 18:37, Raymond Domp Frank <hewpatek@...> wrote:
On Wed, Oct 16, 2019 at 02:38 PM, Rune Broberg wrote:One "minor change" I like a lot is the better handling of the (X-axis) |
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Re: NanoVNA-Saver 0.1.3
On Wed, Oct 16, 2019 at 02:38 PM, Rune Broberg wrote:
One "minor change" I like a lot is the better handling of the (X-axis) numerals in my graphs. Say, I'm using a span of 100 kHz around 20 MHz. "Return loss" and "Gain" graphs now show two decimals where it makes sense. Previously, all X-axis points were shown as "20.0 M", whereas now they go from "19.95M" to "20.05M" and the center point still shows "20.0M". Neat. Raymond |
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Re: Abbreviated documentation for more simplistic tasks?
Maybe, "Find the resonant frequency of thisIf you check out Wiki Application Notes, then you will discover some are simply links to useful messages. If "Application Notes" seems too stuffy or ambitious, we could start a Wiki "How-To" page. Keep in mind key word search from /g/nanovna-users/wiki and /g/nanovna-users/messages FWIW, "resonant frequency" gets no hits in Wiki, but 17 in Messages; sorting and supplementing those might yield a useful HowTo or three... |
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Re: Any ideas for test jigs?
jim
Very nice ...Several of the older data books also show test circuits for individual transistors ...I've been contemplating making some measurements of Ft/Ic for various known/unknown...unknown/unknown transistors
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Maybe I should build something... Jim On Wednesday, October 16, 2019, 8:34:05 AM PDT, alan victor <avictor73@...> wrote:
Please take a look at hp application note 77-1. Transistor Parameter Measurements. Info in the note still applicable today as well to passive devices. Yes, you need to take care that the device input power CH0 is reduced from the -9 to -12 dBm power level. Say, -20 to -30 dBm.? As well, the output power set by the DUT gain is not excessive as delivered to CH1. In AN 77-1, the grand daddy of the vna, the vector voltmeter is discussed, however, test fixtures and the application of the bias tee network is presented. Note 2- directional couplers are featured on the cover. The vna you use has in effect only one of those couplers (a resistor bridge). Hence you need to turn the device around to obtain the remaining s data. Or, see another post where another user has built a switch function for doing this task. Also, see LT Spice simulator which is free. LT handles active devices with models and provides S parameter output data. So you can run a simple 2N3904 at 30 MHz or so,? where package parasitic of the transistor is not so critical and see the expected results. There is quite a bit of information to digest before you can expect to get measured results to agree with calculation. However, the eureka moment is sure worth the effort! FUN. |
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Re: NanoVNA-Saver 0.1.3
W5DXP,
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thanks - don't make it sound like it was horrible before ;-) -- Rune / 5Q5R On Wed, 16 Oct 2019 at 18:03, W5DXP <w5dxp@...> wrote:
Many thanks, Rune, IMO a considerable improvement. |
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Re: NanoVNA-Saver 0.1.3
Hi Martin,
I want to do more things with markers, including having the ability to add more of them, and/or to change what information is being displayed. Not sure it will be in the next release, but it's on the list. I am a little confused, though - my background is not (at all) in RF tech: Isn't Series R & X = Z? Which is already displayed? Or what are we talking here? -- Rune / 5Q5R On Wed, 16 Oct 2019 at 17:18, Martin via Groups.Io <martin_ehrenfried= [email protected]> wrote: Hi Rune, |
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New file uploaded to [email protected]
[email protected] Notification
Hello, This email message is a notification to let you know that the following files have been uploaded to the Files area of the [email protected] group. Uploaded By: Larry Rothman <nlroth@...> Description: Cheers, |
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File updated in [email protected]
[email protected] Notification
Hello, This email message is a notification to let you know that the following files have been updated in the Files area of the [email protected] group. Uploaded By: Larry Rothman <nlroth@...> Description: Cheers, |
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Re: Abbreviated documentation for more simplistic tasks?
Wes,
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You will find most of the info you're looking for in the forum's WIKI and FILES areas.There are app notes, 'just starting' notes and most other references there.After you browse those areas and have read up on the latest version of the User Guide from Oct 2, you should have a better understanding. When browsing the forum, set the mode to TOPICS instead of individual messages - you can scroll through faster. Also, browse the photos section. If you see something intersting, look at the date it was uploaded and go to the messages for that period in time to find more info. But by all means - play with it!! (after you've calibrated it and don't forget to press RESET, then CALIBRATE to start - it's all in the WIKI) Cheers,Larry On Wednesday, October 16, 2019, 1:01:43 p.m. GMT-4, N9KDY <n9kdy@...> wrote:
Not, "Is there?" but what are some of the more simple functions of this thing which might benefit beginning users, so that as I run into them I can perhaps write some?? To be submitted to the group for critique and correction?? I would add them to the archive of documentation, for the possible edification of other new people, of course. Step one, step two, et c., sort of really simple things, starting with basic calibration. Maybe, "Find the resonant frequency of this antenna-feedline-filter-(whatever)" could be next?? Those sorts of things a ham operator might want to know how to do today, rather than spending weeks learning esoterica.? (Not a thing wrong with esoterica, just not precisely useful on a day-to-day basis when all you might really need at the moment is where to cut the dipole.) What else in this vein comes to mind?? Does this already exist somewhere?? Or is this the wrong forum for such?? I'm new here, and don't wish to presume.? (I've got decades of practice at being wrong, I'm used to it, and have become unfortunately quite good at it.) -- Wes Will N9KDY |
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Abbreviated documentation for more simplistic tasks?
Not, "Is there?" but what are some of the more simple functions of this thing which might benefit beginning users, so that as I run into them I can perhaps write some? To be submitted to the group for critique and correction? I would add them to the archive of documentation, for the possible edification of other new people, of course.
Step one, step two, et c., sort of really simple things, starting with basic calibration. Maybe, "Find the resonant frequency of this antenna-feedline-filter-(whatever)" could be next? Those sorts of things a ham operator might want to know how to do today, rather than spending weeks learning esoterica. (Not a thing wrong with esoterica, just not precisely useful on a day-to-day basis when all you might really need at the moment is where to cut the dipole.) What else in this vein comes to mind? Does this already exist somewhere? Or is this the wrong forum for such? I'm new here, and don't wish to presume. (I've got decades of practice at being wrong, I'm used to it, and have become unfortunately quite good at it.) -- Wes Will N9KDY |
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Re: Cal Procedure Question
OK, got that.
Thanks for the reply. 73, Dick, W1KSZ Sent from Outlook<> ________________________________ From: [email protected] <[email protected]> on behalf of alan victor <avictor73@...> Sent: Wednesday, October 16, 2019 8:08 AM To: [email protected] <[email protected]> Subject: Re: [nanovna-users] Cal Procedure Question Hello Dick, No, reset is confined to the register you are working. It will clear cal data in only that register. The frequency display range you entered will stay in tact. After reset, begin the cal. Regards, Alan |
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Re: Nanovna-F is here
Trygve Sjothun
Hello Warren,
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Could you be a little more specific about the vendor on ebay? It would be a shame to waste money on a dud or substandard product Cheers, Tryg -- On Wed, 16 Oct 2019 at 04:28, Warren Allgyer <allgyer@...> wrote:
Where did I purchase? eBay and it took about 4 weeks to arrive. |
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Re: NanoVNA-Saver 0.1.3
Hi Rune,
I just tried NanoVNA-Saver 0.1.3. I think the new enhancements are a great improvement in terms of usability and the fixed scaling options help prevent charts 'jumping around' all over the place when they auto scale, which make comparisons between plots so much easier. Thanks for following up on the suggestions, much appreciated. Cheeky ask - Any chance of adding Series R & X values to the markers in the next release :-) Regards, Martin - G8JNJ |
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Re: SOLT calibration vs. TRL
Dr. David Kirkby from Kirkby Microwave Ltd
On Wed, 16 Oct 2019 at 08:30, <erik@...> wrote:
Em, in that case it would suggest a 4-receiver VNA may be economic if the switch was external and purchased by the user if they want it. That¡¯s what the VNWA 3E - it provides the signal, but not the actual switch. It¡¯s often possible to pick up HP/Agilent 18 GHz SPDT mechanical relays for a modest amount of money in small quantities. I have 10 here I picked up very cheaply. I believe there¡¯s a way of configuring just two, which enables one to reverse the direction of the signal. There¡¯s information somewhere on the VNWA resources how to do this, without actually needing a more specialised relay designed for that purpose. I would see the major advantage of 4-receivers to be the ability to perform *unknown thru calibration*. That is incredibly useful, as you can perform a calibration with two male cables, ignoring the properties of the thru. The adapter can even be SMA to N, or even a waveguide to coaxial. The NanoVNA is an amazing bit of kit for the money. Dave. -- 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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Re: Any ideas for test jigs?
Please take a look at hp application note 77-1. Transistor Parameter Measurements. Info in the note still applicable today as well to passive devices. Yes, you need to take care that the device input power CH0 is reduced from the -9 to -12 dBm power level. Say, -20 to -30 dBm. As well, the output power set by the DUT gain is not excessive as delivered to CH1.
In AN 77-1, the grand daddy of the vna, the vector voltmeter is discussed, however, test fixtures and the application of the bias tee network is presented. Note 2- directional couplers are featured on the cover. The vna you use has in effect only one of those couplers (a resistor bridge). Hence you need to turn the device around to obtain the remaining s data. Or, see another post where another user has built a switch function for doing this task. Also, see LT Spice simulator which is free. LT handles active devices with models and provides S parameter output data. So you can run a simple 2N3904 at 30 MHz or so, where package parasitic of the transistor is not so critical and see the expected results. There is quite a bit of information to digest before you can expect to get measured results to agree with calculation. However, the eureka moment is sure worth the effort! FUN. |
Oristo
Dick
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