How To Measure Ferrites using a NanoVNA

Comments · 162

• HA

  @HamRadioDX · 8 months ago · pinned

  Want to go from confused to confident on air? <br>I built a step-by-step beginner course here → <a href="https://hamradiodx.net/30days">https://hamradiodx.net/30days</a>

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• SI

  @silvermica-u3d · 1 year ago

  I have been in the electronics field professionally &nbsp;for 39 yrs and this video was really interesting and informative. Thank you!

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• LA

  @larslindgren3846 · 1 year ago

  I really don&apos;t understand why most ferrite cores aren&apos;t marked with material type, brand and part number.<br>It makes it easy to get them mixed up.

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• JA

  @JamieStuff · 2 years ago (edited)

  You are on the right track with the resonance theory about your &quot;3 turn&quot; coil. This is evidenced by the fact that you are showing +6 dB on 2m, so you definitely have some E/I phase games going on. &nbsp;All coils have a self-resonant point, due to the L of the coil, and the (parasitic) C vetween the turns of the coil. &nbsp;I would expect a MUCH different result if you spread the turns around the ferrite.<br><br>The Smith chart should explain what&apos;s going on. &nbsp;I might dig out my NanoVNA and do some experimenting.<br><br>(Edit: I&apos;m an EE, though it&apos;s been a few decades since I studied this.)

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• DA

  @DavidWitkowski · 1 year ago

  Nice video. I strongly suggest you stop spinning the center pin of those calibration standards. You want to protect the center pin. Hold the standard in place and rotate only the shield ring.

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• MR

  @MrApolloTom · 1 year ago

  <a href="https://www.youtube.com/watch?v=LGwgn_0ADUI&amp;t=587">9:47</a> Thanks, I also learned today that you can drag the pointer!

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• MI

  @mike94560 · 2 years ago

  I set display scale to 3 so it is easier to find 3dB points. Nice video.

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• CR

  @craigwestlake7362 · 2 years ago

  My NanoVNA arrives next week! Another rabbit hole to explore.. Can’t wait now to experiment. &nbsp;Thanks Hayden.

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• WI

  @williamscott8397 · 2 years ago

  I have a device inbound. I really appreciate your instructional style. Keep pumping out relevant and helpful content!

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• RI

  @richardowens9061 · 1 year ago

  Remember, ferrite beads are typically sized for the intended application. &nbsp; And, you want your coax/wire/cable to have close contact with the ferrite material for best results. &nbsp;Pulling extra windings through the ferrite bead will increase contact with the core material, resulting in better performance - to a point, as you discovered.<br><br>And, you hit the nail on the head as to why extra turns stop helping and start decreasing performance. &nbsp; The capacitance of the turns &nbsp;combined with the inductance creates a resonant circuit at some frequency and its harmonics. &nbsp;This would become more clear, if you expanded the range up to 1GHz, or higher.

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• DD

  @DD4DA · 7 months ago

  A very helpful video. It shows the handling and setup to messure an unknown ferrite. This method is also very good to messure the supression of a Current-Balun.

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• DE

  @deanhutchinson3848 · 2 years ago

  By adding more turns to the ferrite core you create a capacitor &nbsp;with the wire. This will then bypass the higher frequencies. Depending on the core material you also tune the core to a lower frequency by adding more turns. The normal recommended maximum number of turns is about 3max

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