You mentioned you are not a ham, then proceeded to do more radio experimentation than most hams I know ever do. I encourage you to join us in the hobby. You'd be an amazing resource for a local club and might enjoy working uWave with others. 10 and 24gHz are popular for hams.

Many years ago, I would tune dented waveguides by putting opposing dents at specific distance from the original dent. This was done in a combat/battle situation to keep the gear operational. Had to do many hacks to keep the equipment running. Active/passive equipment operating from 3mhz to 18ghz!

Thanks very much Joe! Cool DIY lesson about extending the frequency range of the NanoVNA, which I love.

From someone who knows nothing about wave guides, I found this video fascinating. Well done! 😊

Thanks a lot, for sharing this very interesting experiments. This is why I loveYT and prefer the "smaller" channels of real experts to the journalistic "million" channels.

Amazing video Joe, thank you for your contribution. I am an ECE student. The last few months I have been studying antennas in my spare time. Currently going through Dr. Balanis' book. Your videos are one of the things that drew me into the field. I wish you the best from Greece!

Thank you for this video Joe. It's as clear and detailed as usual for your presentations. They are all excellent work. I'm interested in your LiteVNA mods. I'll double check your previous videos to see if you did a video on them. I'll also go check for anything further on the EEVblog. If there is nothing already published, your mods might make an interesting and useful video. Again, thanks for your work.

Most. Excellent. Video. Sir! I was highly skeptical that any VNA under $200 could be worth a damn... you have put me at ease.

This is an excellent video. I learned quite a bit watching this! Thank you. You have also convinced me to buy a lite vna 64. I have many filters, splitters, amplifiers, and isolators that are above the 1.5 GHz limit of my Siglent SVA1015x that I would like to characterize. Do you have a sheet metal bender or did you bend the sheets in a vice?

Amazing work! Was really fascinated by the handmade waveguides, filters and horns, you made it seem all so simple so I'm keen to try making some myself. I have access to a resin 3D printer, so if I did this I would try printing cavities using that and then spray coating a conductive layer. I know the signal path had a go but he used a filament printer thus had some issues with dimensional accuracy. Anyway, thanks for the inspiring video!

Plumber's copper tubing might give a fine wave guide

Thanks for sharing the amazing video! What is the tiny metal tube in the Extender Board? Is it a coaxial cable or waveguide tubing?

This was fascinating, and I think I'm hooked on wanting to know more about your extender and the topic as a whole. I do have a question, that might seem basic, but for which I've never seemed to have come across a proper answer - What impact does the thickness of the material used for your waveguides and filters have? Is it purely structural, or does it influence the conductivity of the guide? Edit - Your next instalment has literally just dropped - 58 mins ago, so basically the watch time for this and composing this comment ago. I hope to find an answer there.

Hi Joe! Great video. I'd like to reproduce your experiments, but I'm new to this, so I need to ask a new guy question. How did you make your wave guide antenna probes? I see you used an sma connector, but I'm not sure about the wire to make the antenna. Did you solder it to the center post of the male end of the connector or insert a wire into the female end with solder (if so, what gauge)? Why is it covered in dielectric? Also I've seen diagrams in some books where they will bend that wire and touch the side of the rf cavity or wave guide. Any thoughts on the performance differences in that case. I'm assuming that creates a loop antenna. Does that create a TM10 mode? Thanks, Tom

Really cool demos. I wonder what the influence is of closing the seams on the box, or aligning the panels closely vs loosely. Possibly a lower Q with some leakage around the box, but I can't imagine having a huge effect at these frequencies.

Witchcraft! I wonder if al/cu copper tape would seal your guides ok? Happy new year Joe.

I have a question about my fluke 789 and figure there's a lot of really smart electronics ninjas on here. Without any leads in the meter it reads about 5 mega ohms. Any body have any good ideas what would cause that. I'll probly send it to fluke but I'm curious 🤔

It would be appreciated if you could make your videos available in 1080p. The screen captures are fairly blurry at 720p

This was a really good presentation ! I'm surprised your not a "Ham" , our hobby would benefit greatly if you were. I got a chuckle out of that old article, There is a whole group of hams that play with 10ghz and greater these days. 👍

Respected Sir, Could you please explain the meaning of different standing wave modes e.g., π mode and 2π mode etc.

You're too smart for me Joe, but I enjoy your content.

cavity filter .

a couple of major flaws in this design. you should never cut the WG at the corner lines. That's where the transversal current on the walls is maximum so any small gap even hardly visible by eye will radiate quite easily. Instead the WG is always made from two halves that are cut in the center line and screwed together. That's where the transverse current on the walls is zero. The longitudinal current on the walls is maximum at the center line but since it is parallel to the gap (cut) it will not radiate. The second isssue is that the distance of the coaxial pin must be quarter of "GUIDE WAVELENGTH" from the end wall. That is quite different than the free space wavelength that you used here so the input VSWR will be hard to adjust. The guide wavelength (wavelength of the guided wave in the tube) is LARGER than the free space wavelength at the same frequency. I cannot type the formula here