Create Your Own Tubular Capacitor! (028)

In previous videos I mentioned that you can make your own tubular capacitors for things like antenna traps.
In this video, I am going to show you how to build the new and improved version of the tubular capacitors that I created for my 20m/40m trapped inverted-vee antenna.
The purpose of the improvements is to increase their high voltage capability.
I estimate that this improved version should be good to at least 20 kV based on the dielectric strength of the polypropylene tubing and the mechanical construction.
I absolutely know that they will work just fine in an antenna intended for use with 100W because their lesser capable cousins (the ones in my traps for the 20m/40m inverted-vee) worked great with my 100 watt transmitter.
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Unfortunately, I do not have the means to test what their actual voltage and current limits might be. If *YOU* do, please feel free to share your test results with me if you care to do the testing.
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Time Markers for Your Convenience
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00:05 Introductory Comments & Description
01:15 What do we need to build these?
03:10 Materials Preparation
03:13 Measure and Cut to Length
03:41 Cleaning
04:42 Measuring and Marking
05:13 Assembly
05:15 Rod into Poly Tubing
05:48 Fill the Cavity
06:19 Rod/Tubing Assy into the Aluminum Tubing
07:13 Add Hot Glue into Cavity
07:32 Drill the Holes
08:10 Add the Shrink Tubing
09:27 Install the Screws
10:11 Measuring the Capacitor's Value
10:17 What do I Need?
11:35 Assembling Our Test Fixture
13:00 VNA Calibration
18:16 Measuring the Capacitor
19:01 What about the reported Q?
20:21 FINAL RESULTS from 3 VNAs
21:02 Why not measure it with my Antenna Analyzer?
22:18 An invitation to collaborate!
23:03 Final Comments and Toodle-Oots!
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[@dennisqwertyuiop]

nice project and testing

[@eie_for_you]

Yeah. It was a fun one and great for use in making antenna traps! 😎