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Yes, it is not labeled 'TDR' in the menus. Instead it is appropriately labeled 'Transform', since it is not a true TDR, but simulation of a TDR via Fourier Transform. On the menus: Display -> Transform. Usually the "Low Pass Impulse" is an appropriate selection. There are some videos you can find online that describe its use. Also messages in this group from a long time ago. It requires setting up the frequency scan range appropriately for the corresponding time-length you require, which can be a bit counter-intuitive, and you need to take care to set it appropriately to avoid aliasing, which would give a false answer. But it works very well once you know how to set it up.
Stan KC7XE |
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W2AEW has a very helpful video on this subject, as well as many very help
videos regarding the nanoVNA & ham radio in general: Thanks, Robin Midgett K4IDC On Mon, Dec 30, 2024 at 5:58?PM Matthew Rapaport via groups.io <quineatal= [email protected]> wrote: Great references, thanks! |
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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 couldn't find it. My concern about the site was that the cable and antenna (for an FM radio station) that I needed to measure is on a tower with many other antennas on it. Instructions for the AA-600 note that transmitted signals from nearby antennas could affect the TDR measurements and even possibly damage the instrument. I suppose this could hold true for the NanoVNA, too. There did not appear to be any effects of other signals on the TDR measurement when I made it. Zack W9SZ On Tue, Jan 7, 2025 at 8:48?AM Robin Midgett via groups.io <RobinK4IDC= [email protected]> wrote: W2AEW has a very helpful video on this subject, as well as many very help |
Robin Midgett