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Re: Saver with Win7
With totally different software (National Fire Information Reporting System),
installing on Windows 7 you need to ignore the default install location and go direct to the C: drive. With the default location you're in permissions hell. I don't know if this is relevant but it might be. Bear W5VZB |
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Re: Trying to understand the T-Check outcome of the nanoVNA
Dr. David Kirkby from Kirkby Microwave Ltd
On Wed, 25 Sep 2019 at 18:47, Dr. David Kirkby <
drkirkby@...> wrote: On Wed, 25 Sep 2019 at 15:53, <erik@...> wrote:The T-check theory assumes that the T is lossless.Using a not too good BNC Tee I performed a T-Check -- 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: Trying to understand the T-Check outcome of the nanoVNA
Dr. David Kirkby from Kirkby Microwave Ltd
On Wed, 25 Sep 2019 at 15:53, <erik@...> wrote:
Using a not too good BNC Tee I performed a T-Check What do you connect on the the third port of the T? Most people connect 50 ohm loads, but personally I am skeptical of the logic of that, as it means both ports see a constant 25 ohms. BNC calibration kits are as rare as rocking horse dung, so I doubt that the calibration kit is working correctly.
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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Experimental 256 point FFT Firmware
XENOMORPH, who I believe first introduced the 1500 MHz, tdr, and battery icon firmware mod, has just released a firmware mod that adds additional 256 point FFT capabilities versus the current 128 point FFT. He posted a photo showing the new firmware being used to perform a tdr measurement on a 65 meter length of RG-6U (0.89) see attachment. The measurement was accurate to 0.07 meters. I have also attached his DFU file in-case someone wants to play with it. I am going to order another nanoVNA to experiment with all the new firmware mods that have started to appear. My current firmware works so well that I hesitate to muck with it.
RG-6U 0.89.jpg
XENOMORPH firmware with FFT 256, instead of 128_1500.rar
XENOMORPH firmware with FFT 256, instead of 128_1500.rar
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Re: R + jX ?
Hi Steve,
Others have asked for this as well. And I think as far as I know, the short answer is NO. Unless there is a plan to update the firmware to do that calculation and provide a touch key to bring up that format. May I ask... when up on the tower, so you know in advance what range of X your supposed to see. Pre- calculate the expected value and go with that? Not the ideal answer, but that's sort of what I have done with my simple wire antenna. Alan |
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Re: NanoVNA Saver
Bruce
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Have a look here Cheers Al On Wed, 25 Sep 2019 at 12:17, Bruce KX4AZ <bruce@...> wrote:
Rune, |
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R + jX ?
I will apologize if this has already been covered. I didn't find it in a search.
I see that, by default, NanoVNA reports R + L/C . Is there a way to change that to R +- X ? Yes, I know the PC software can display it both ways, but my primary use for the NanoVNA is up on the tower, to make measurements at the feedpoint. The NanoVNA is a lot more convenient than carrying up a bulky and expensive antenna analyzer. Thanks, Steve, N2IC |
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Re: Firmware font size - 2 versus 4 trace
I have seen a technique where the font is "enlarged" simply by outputting each scan of the character font twice. This makes the character appear taller. It can make the text surprisingly more legible with no more font RAM and just a small hit on the code space. Of course you still will need screen space. Because the characters, while more legible, are a bit ill formed, this might be available as an selectable "ZOOM" mode unneeded by those who purchase the reading glass option.
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Trying to understand the T-Check outcome of the nanoVNA
Using a not too good BNC Tee I performed a T-Check
Attached the measurement (.s2p) and the excel file (.xlsx) in which the T-Check is calculated. Next to the T-Check calculation the excel also calculates the abs(Zin-Zout)/Z0 (the percentage absolute distance of the two impedances as another estimate of error) The frequency is denoted in MHz Do ignore anything above say 500MHz The T-Check suggests the error quickly increases to substantial levels but the abs(Zin-Zout)/Z0 suggests there is a very systematic error in my measurement where the absolute distance of the two rotating impedances grows very linear with frequency. I did calibrate using the Tee without (OSL) and with (T) the outgoing cable connected but maybe that did result into the error. What am I doing wrong? |
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Re: Firmware font size - 2 versus 4 trace
On Wed, Sep 25, 2019 at 09:26 AM, <erik@...> wrote:
Erik, Thanks for confirming memory capacity is a factor in the font sizes. My progressive bifocals work fine with the smaller fonts, but I imagine it's just a matter of time before someone releases a new firmware "flavor" with two traces & 1500 MHz extended range. With the newest firmware versions, can you give us any sense of how close we are the memory capacity "ceiling"? Thanks, Bruce |
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Re: Saver with Win7
Thanks Alan! See, I didn't even figure out it was an S21 measurement :D
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-- Rune / 5Q5R On Wed, 25 Sep 2019 at 16:37, alan victor <avictor73@...> wrote:
Hi Rune, |
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Re: Saver with Win7
Hi Rune,
The group delay (GD) is obtained from the transmission phase, S21. The negated value of phase shift calculated as the small change in phase shift occurring with a small change in frequency. The difference in phase with difference in frequency (the aperture) taken small enough to arrive at an accurate value for GD. The site below is a good reference and provides a useful calculator so you can test your routine: Regards, Alan |
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Re: Saver with Win7
Thanks for the suggestion, Bryan. It sounds interesting. Do you know if/how
group delay is determined from S-parameters? I'm not really an RF engineer, so I have had to figure out all these things from the ground up ;-) (Also, no more busy than I can easily answer emails. :-) -- Rune / 5Q5R On Wed, 25 Sep 2019 at 16:17, bryburns via Groups.Io <bryburns= [email protected]> wrote: peter_pc2a |
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Re: Saver with Win7
peter_pc2a
I am running nanovna-saver.v0.0.11 on Win 7 - 64 bit and it is working great. The software is very useful and seems to be quite stable. Rune: I know you are quite busy. Here is a suggestion: I would like to see group delay added to the measurements. Thanks, again, for all of your great work. -- Bryan, WA5VAH |
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Re: Saver with Win7
Using Thunderbird, and perhaps other email clients, you should see the poster's full email address on the "From" line at the top of the email header. For instance, when I look at your email (to which I am replying here), I see k4tql@....
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One can right-click on the email address and copy it. DaveD On 9/25/2019 9:50 AM, BruceN wrote:
A bit off topic, perhaps, but tell me, how do I expand an email address like mihtjel@... ? |
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Re: Saver with Win7
Hi Bruce,
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I'm not certain quite how it works via groups.io, but I did attempt to put my email (mihtjel@...) in the body of the email I sent earlier, in order that Peter (and others) could contact me directly, should they need to. I should probably set up an official email address for nanovna-saver at some point, given the number of users it's starting to accrue, but for now, gmail is doing fine at sorting them for me. ;-) -- Rune On Wed, 25 Sep 2019 at 15:50, BruceN <k4tql@...> wrote:
A bit off topic, perhaps, but tell me, how do I expand an email address |
Bear Albrecht
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