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There was a recent thread in the TinySA group in regards to "resistive vs inductive" RF taps, not sure if that's what you are referring to. /g/tinysa/topic/79601195

You are right! I just assumed that you are genuinely interested in this subjects, but as many others using nanoVNA not formally educated in this "branch of science", so I tried to word it in a way

Joao CU3AA what is the duplexer model you want to adjust?

This video also helped me to make the separate adjustment of each of the TPRD-1554. https://www.youtube.com/watch?v=Z1GIFVgdSSU

Gary, Sig and Kadir Thanks a lot for your replies. Already have enough information to tune up the cans, hopefully with better results than last try. Then I tuned the notch down but had no power out

You wrote: "KEY Down on CW and 175 volts p/p" Please behave like an adult.

Wind 5 turns on one side of the core and measure the inductance. Wind additional 5 turns on the other side, parallel them and measure again. Do you get half of the inductance? * Considering each wire

This video helped me a lot in understanding how to adjust a set of cavities, I hope it will serve you too 73. https://www.youtube.com/watch?v=tD1upx4-DDI

Greetings from cm3kma, I comment that last month I had to readjust the TPRD-1554 in the place where they are installed and the only tool I have to be able to do this readjustment was a modest VNA of

Op 10-2-2021 om 17:15 schreef Jim Lux: I would do it in a different way. Cal

What you are measuring is DM loss through the balun. Ideally, this should be low. The Smith Chart, S21, and S11 all look about right for that measurement. If you wish to measure CM attenuation,

Thank you for the great summary and information about measure CMC CM attenuation. I have a couple of follow up questions for you and/or the group, if I may. I notice the process is for bifilar chokes.

Brian, no pix. I took it apart as I had another application for the RG-142. In the future, I'll take pictures. Dave - W?LEV -- *Dave - W?LEV* *Just Let Darwin Work*

Hi DiSlord, I just tried to compile your H code with the updates from a few days ago and got the following errors in the ChibiOS area. I installed ChibiOS from your current repo.

S21 - start putting attenuators in and seeing where it bottoms out (or where the displayed attenuation change doesn't match the actual attenuation change) S11 - calibrated mismatches - attenuator into

I made some small changes of my Nanovna-H. Is there a way to test s11 and s21 dynamic range?

A kluge way to see/capture the quickly disappearing screen... If you have a smart phone with camera capable of taking video, start a video recording of your nanoVNA screen during start up. Stop video

If you want to build your own.. A nice 20dB sampler is a voltage divider with a 450 ohm and 50 ohm resistor in series. That gives you a nice 10:1 voltage ratio, and the 500 ohms in parallel

Rough tuning can be done with the NanoVNA but fine tuning the notches is best done with the actual repeater receiver. To rough tune, use the s21 measurement. Connect the source port (ch0) to the

This youtube video shows a comparison between the NanoVna H4 and a Tektronix TTR506A "professional" VNA to show the difference in dynamic range. https://www.youtube.com/watch?v=GipCVEsiqXc ? Of