How effective are various ferrites in RFI (noise) suppression? You can use a NanoVNA to find out!
Equipment in this video
NanoVNA SAA-2N 
https://geni.us/YPOGD0
NanoVNA H4 https://geni.us/SqRmO
Ferrites
FT-240-43 Ring https://geni.us/qpzIxP
FT-140-43 Ring https://geni.us/ps6to
Clamps https://geni.us/DVfAN
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Up next:
Chapters
0:00 A ham’s best friend
1:23 Using the NanoVNA
2:52 Calibration and setup
6:19 Testing Clamps
13:56 Testing Rings
17:00 Testing Beads
18:13 Random ferrite cores
19:00 FT140-43 test
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