Re: Tuner Measurement
OK...Easy Path. 1) For one, the NANOVNA can not "read" tuner settings. You will have to record those yourself. 2) The NANOVNA should be connected to the "rig" side of the tuner with a SHORT piece of
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W0LEV
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#39034
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Re: Tuner Measurement
This is an interesting problem - I was doing the same, to characterize an LDG autotuner (what *are* the actual L and C steps). There's two problems you've identified here: The first is "what is the
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Jim Lux
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#39033
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Re: Tuner Measurement
This is an interesting problem - I was doing the same, to characterize an LDG autotuner (what *are* the actual L and C steps). There's two problems you've identified here: The first is "what is the
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Jim Lux
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#39032
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Tuner Measurement
I am thinking to build discrete circuits for a specific non-resonant antenna to operate on HF bands without a remote tuner. I managed to snag one of the last MFJ-948F Versa Tuner II left in stock.
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Paul Wolf KY4XJ VA
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#39031
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Re: TDR function?
Thanks! As it turned out, I have a RigExpert AA-600, and it was very easy to use as a TDR. Much easier than the NanoVNA. Somewhere I have a real TDR, a TEK 1502. But it's in storage and is so buried I
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Zack Widup
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#39030
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Re: TDR function?
W2AEW has a very helpful video on this subject, as well as many very help videos regarding the nanoVNA & ham radio in general: https://www.youtube.com/watch?v=9thbTC8-JtA&t=608s Thanks, Robin Midgett
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Robin Midgett
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#39029
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Re: Unable to upgrade firmware to 1.2.27
Hi Stan, Problem solved, your advice was accurate and effective. 1.2.40 uploaded without any issue using bin file and STM Cube Programmer. Many thanks. Best regards, Georges F6DFZ
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Georges Ringotte
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#39028
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Re: Unable to upgrade firmware to 1.2.27
Don't worry about the MS vs SI designation. Both are handled by the firmware. There is a setting in the 'Expert Settings' part of the menu structure to select the MS or SI part. The firmware files
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Stan Dye
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#39027
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Re: Unable to upgrade firmware to 1.2.27
Hi Stan, thanks for your answer. I did get the working 1.2.20, and the not working 1.2.27 from this page : https://github.com/hugen79/NanoVNA-H/releases My NanoVNA-H4 needs a SI file as there is no MS
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Georges Ringotte
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#39026
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Re: Unable to upgrade firmware to 1.2.27
Georges, Are you sure you are trying to load the correct firmware file for the H4? If you try to load the 'H' file or a 'V2' file, it will give a black screen. And where did you get the 1.2.27 file?
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Stan Dye
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#39025
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Unable to upgrade firmware to 1.2.27
Hi, I have been busy a few hours to try to upgrade firmware of my NanoVNA H4 to 1.2.27. Tried STMCube progammer 2.9.0, which usually is fine, with the correct 1.2.27 bin file, and get a black screen.
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Georges Ringotte
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#39024
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Re: Querry a tuners' settings for L&C with a NanoVNA
Hi Jim, The issue is not of a "mismatch" as you describe, but, rather of the correct (rated) load the QCX apparatus has to see to work as expected. If we take your example of a DC power supply, for a
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PY2CSH
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#39023
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Re: Measuring GPS antenna bandwidth
Use a TinySA Ultra to view the spectrum at the LNA output would be a start. For an antenna receiving both the 1.2 and 1.5 GHz signals you might try:
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David J Taylor
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#39022
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Re: Measuring GPS antenna bandwidth
Would the right approach be to use Port 0 (the source) on the VNA to drive a broadband probe (non trivial) and use Port 1 to measure the response of the antenna/LNA combination. ?You can calibrate
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Jim Lux
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#39021
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Re: Measuring GPS antenna bandwidth
Dunno how to separate the LNA, unless there's a tiny coax connector behind it somewhere that you can jack into. I've seen some tiny coax connectors that were apparently there for testing purposes (or
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BryonB
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#39020
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Re: Measuring GPS antenna bandwidth
Hi George, Look up "Bias Tee Power Injectors" on Amazon.Lots of them at $15 or so with stated bandwidth to 6GHz. -----------------------------------------From: "George" To: [email protected] Cc:
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Ted Chesley
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#39019
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Re: Measuring GPS antenna bandwidth
Those look really good. The ZABT-2R15G+is on the expensive side but is available from Mini-Circuits in quantities of one. The TCBT-6G+ and TCBT-14+are less expensive but are only available from
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Zack Widup
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#39018
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Re: Measuring GPS antenna bandwidth
Take a look at a RF/DC bias tee https://www.minicircuits.com/products/BiasTees_tab3.html?srsltid=AfmBOoocSGeXYDFhK0Qnzs3pAgRya-CUm_JwkooYFMf0X4PLjYGEpbqL
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Jim
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#39017
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Re: Measuring GPS antenna bandwidth
You are going to find few GPS antennas that pick up both L1 and L2.The classic patch antenna does not have anywhere near the necessary bandwidth.Most of the antennas that do both really have 2 patch
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KENT BRITAIN
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#39016
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Re: Measuring GPS antenna bandwidth
You would have to buy or make a bias tee that works on that bandwidth. I made one using stripline on a piece of G-10 pc board material. It was designed for 1296 MHz. I don't know how well it will
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Zack Widup
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#39015
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