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nanoVNA - Coaxial Cable Measurement Methods (Characteristic Impedance and Cable Loss) - VE6WGM 4 года назад


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nanoVNA - Coaxial Cable Measurement Methods (Characteristic Impedance and Cable Loss) - VE6WGM

1. Calibrating the nanoVNA 2. The Smith Chart - Briefly (Begins at 8:24) 3. Measuring the characteristic impedance of coax cable. (Begins at 11:46) 4. Measuring coax cable loss. (Begins at 22:34) *Correction 1: At 23:34 I stated that the nanoVNA has a directional coupler. I have since discovered that this is not accurate information. The nanoVNA actually uses a bridge to make it's measurements. My apologies. For more information on how this works, please see this excellent video here:    • #502 NANOVNA Demystified   * Correction 2: I recently looked back at this video (June 2023) and realized that I was referring to the ports on the nanoVNA as “Port S11” and “Port S21”. I believe this is not the correct way to identify these ports. Port 1 is where one takes S11 measurements, and Port 2 is where one takes S21 measurements. S11 and S21 indicate the type of measurement being taken… Port 1 and Port 2 are where these measurements are taken. Listening to how I was referencing these ports in this video now sounds awkward to me given the progress and experience I’ve gained in the use of the nanoVNA since this video was created. ********************************* Q - Can a piece of coaxial cable be resonant? https://www.allaboutcircuits.com/text... https://www.rfcafe.com/references/ele... A - Yes. It can! ********************************* References: https://hamwaves.com/zc.measuring/en/... http://rfcec.com/RFCEC/Section-3%20-%... https://www.allaboutcircuits.com/text... http://www.arrl.org/files/file/Techno...    • How to Measure Transmission Line Para...  

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